I am fiending to know how much HP these headers add.
If 317 HP was obtained with ECU and exhaust, it seems very reasonable to assume with headers a measely 16 more HP would be obtained, netting us the VK power of 333+ HP.
These old cars are beasts.
I know our 0-60 will always suck, but these are seriously formidable cars on the freeway. Stock form they were fairly deadly espically given the cars of the Qs time, but with another 50 + hp, they are fairly lethal, even by todays standards
I want Q45 headers! Ceramicoated mandrel bent headers!
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szh
- Posts: 15932
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- Car: 2018 Tesla Model 3.
Unfortunately, no longer a Nissan or Infiniti, but continuing here at NICO! - Location: San Jose, CA
Re: (rsiwicki)
Too bad you are not near me!rsiwicki wrote:still looking for a M45 to race...my neighbor will not race me know in his M45 after he went for a ride in my car...he said that 0-60 no problem...but after 60mph he thought my car would be chasing him down pretty damn quickly....
I have owned a 1991Q, a 1995Q and now the 2003M45. Based on my "seat of the pants feel" (i.e., no actual races or measurements), the M45 is definitely faster than the two Q's I had, whether from 0-60 mph or 60-120 mph. But, of course, both my Q's were stock, in good condition. It would be interesting to compare to your modded Q.
Z
Re: (rsiwicki)
Rob, contact Dynamic Turbo 10500 NW 37 Terr.Miami Florida 33178 Ph: (305) 593 6160Fax: (305) 593 6194
They have the DYNAPACK dyno, the thing is awesome, this is the dyno JWT and other major tuners use, also used by NASCAR, this is what I put my Q on.
http://www.dynapackusa.com/index.htm
They have the DYNAPACK dyno, the thing is awesome, this is the dyno JWT and other major tuners use, also used by NASCAR, this is what I put my Q on.
http://www.dynapackusa.com/index.htm
I totally agree with wanting to see some numbers. The Q is a definate threat on the street it is just that things have gotten so even now it is ridiculous. They have v6 motors producing the same if not more HP than the Q. Since they are lighter and have 5-speeds now they look faster than us. We'll show them though. My Q has people going "what the hell was that"
Re: (rsiwicki)
No problem Rob, just give them the gear ratios for your transmission and rear end gear, and you should be all set:)
Re: (1qckser)
Well I had some free time today so I called from Chile and found out that nobody has any other type of dyno except a damn dyno jet between WestPalm and Miami. Thanks for the info Todd...but they said nobody down here has anything else except a dynojet. Ugghh!!! and I wanted to dyno my car this weekend since it is suppose to get into the upper 60's Friday night and I will be back in town Friday morning for 2 days and then off to S. America again Saturday night for another 2 weeks.1qckser wrote:Rob, contact Dynamic Turbo 10500 NW 37 Terr.Miami Florida 33178 Ph: (305) 593 6160Fax: (305) 593 6194
They have the DYNAPACK dyno, the thing is awesome, this is the dyno JWT and other major tuners use, also used by NASCAR, this is what I put my Q on.
http://www.dynapackusa.com/index.htm
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AZhitman
- Administrator
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- Car: 58 L210, 63 Bluebird RHD, 64 NL320, 65 SPL310, 66 411 RHD, 67 WRL411, 68 510 SR20, 75 280Z RB25, 77 620 SR20, 79 B310, 90 Z32, 91 GTi-R, 92 Silvia Qs, 98 S14, 23 Z.
- Location: Surprise, Arizona
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Re: (dareo)
Won't happen. Not profitable enough.
Even if I priced them at $800, I doubt more than 1 or 2 folks would step up.
Facts of the biz... I'm learning the hard way.
Even if I priced them at $800, I doubt more than 1 or 2 folks would step up.
Facts of the biz... I'm learning the hard way.
Re: (AZhitman)
I would buy Q45 headers for $800 for sure. It would just be a question of when in the next year or so i can fit that into my budget. Over the next 1-2 years i'd like to have my Q modded up about like rsiwiki's.
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Jeff Williams
- Posts: 3394
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- Car: 1994 Infiniti Q45t
2000 Infiniti I30t
2004 Infiniti M45
71, 72, 73, 82 & 2000 Corvettes - Contact:
Re: (AZhitman)
Do you think those would fit around the Super HICAS pump & solenoids on my t?
By the way $800 for the cat-back is cheap. I paid $1,100 for ONE catalytic converter!
As soon as the I30t is paid for, I will be getting the cat-back exhaust for the silver Q. I plan to leave the black one stock.
By the way $800 for the cat-back is cheap. I paid $1,100 for ONE catalytic converter!
As soon as the I30t is paid for, I will be getting the cat-back exhaust for the silver Q. I plan to leave the black one stock.
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PoorManQ45
- Posts: 16676
- Joined: Fri Jul 02, 2004 5:13 pm
Re: (Rex)
I was looking over those headers again. And I have a few questions.
Are the runners equal length?
It appears that one of the headers is shaped much differently than the other. Will this cause any problems?
Quote »The Exhaust Pulse
Exhaust gas does not come out of the engine in one continuous stream. Since exhaust valves open and close, exhaust gas will flow, then stop, and then flow again as the exhaust valve opens. The more cylinders you have, the closer together these pulses run.
Keep in mind that for a "pulse" to move, the leading edge must be of a higher pressure than the surrounding atmosphere. The "body" of a pulse is very close to ambient pressure, and the tail end of the pulse is lower than ambient. It is so low, in fact, that it is almost a complete vacuum! The pressure differential is what keeps a pulse moving.
Opposites attract, the low pressure tail end of an exhaust pulse will most definitely attract the high-pressure bow of the following pulse, effectively "sucking" it along. This is what's so cool about a header. The runners on a header are specifically tuned to allow our exhaust pulses to "line up" and "suck" each other along![/quote]Did they take this into consideration when the headers were being "engineered"?
Did they take this into consideration in BRM cat-back exhaust for the Q45?
Are the runners equal length?
It appears that one of the headers is shaped much differently than the other. Will this cause any problems?
Quote »The Exhaust Pulse
Exhaust gas does not come out of the engine in one continuous stream. Since exhaust valves open and close, exhaust gas will flow, then stop, and then flow again as the exhaust valve opens. The more cylinders you have, the closer together these pulses run.
Keep in mind that for a "pulse" to move, the leading edge must be of a higher pressure than the surrounding atmosphere. The "body" of a pulse is very close to ambient pressure, and the tail end of the pulse is lower than ambient. It is so low, in fact, that it is almost a complete vacuum! The pressure differential is what keeps a pulse moving.
Opposites attract, the low pressure tail end of an exhaust pulse will most definitely attract the high-pressure bow of the following pulse, effectively "sucking" it along. This is what's so cool about a header. The runners on a header are specifically tuned to allow our exhaust pulses to "line up" and "suck" each other along![/quote]Did they take this into consideration when the headers were being "engineered"?
Did they take this into consideration in BRM cat-back exhaust for the Q45?
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AZhitman
- Administrator
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- Joined: Mon Apr 29, 2002 2:04 am
- Car: 58 L210, 63 Bluebird RHD, 64 NL320, 65 SPL310, 66 411 RHD, 67 WRL411, 68 510 SR20, 75 280Z RB25, 77 620 SR20, 79 B310, 90 Z32, 91 GTi-R, 92 Silvia Qs, 98 S14, 23 Z.
- Location: Surprise, Arizona
- Contact:
That's basic exhaust theory, or Exhaust 101. Good info nonetheless.
The headers appear shaped differently because they are. 99% of all aftermarket headers are. If they were the same, there would be problems, namely fitment.
They are as close to "equal-length" as is possible given the space constraints.
The techs building the headers have been building headers for over 30 years, supply 2 NASCAR teams and compete in NHRA.
My 3 techs building the catbacks have a combined total of 90 years in custom exhaust design.
Yep. Those issues (and a lot more complex calculations) went into the Q headers and catback).
Incidentally, much of the Q's catback design was "borrowed" from the hugely succesful systems build for Ford's modular 4.6.
A second set of headers, utilizing a "stepped tube" design, much like Borla's Cobra headers, are being fabricated, and are expected to provide more low-end grunt than the current design.
The headers appear shaped differently because they are. 99% of all aftermarket headers are. If they were the same, there would be problems, namely fitment.
They are as close to "equal-length" as is possible given the space constraints.
The techs building the headers have been building headers for over 30 years, supply 2 NASCAR teams and compete in NHRA.
My 3 techs building the catbacks have a combined total of 90 years in custom exhaust design.
Yep. Those issues (and a lot more complex calculations) went into the Q headers and catback).
Incidentally, much of the Q's catback design was "borrowed" from the hugely succesful systems build for Ford's modular 4.6.
A second set of headers, utilizing a "stepped tube" design, much like Borla's Cobra headers, are being fabricated, and are expected to provide more low-end grunt than the current design.
Re: (PoorManQ45)
PMQ.....
Are the runners equal length? No....they are not equal length but are much better than OEM manifolds as far being closer to equal length.
It appears that one of the headers is shaped much differently than the other. Will this cause any problems? No....it should not be of any significant obstruction in the flow as the etreme bend is due to the steering shaft just like the OEM drivers side manifold.
Did they take this into consideration when the headers were being "engineered"?.....well yes and no. They did not build a "step down" header, but tried to build as close to equal length as possible. It is about impossible to build an equal length header for a Q45 becuase of the very limited space available to wrap the pipes around.
Did they take this into consideration in BRM cat-back exhaust for the Q45?The BRM exhaust was on the car when they fabricated the headers, but I do not think that CAT-Back exhaust really affects the desgin of the headers as I have never heard that you need to use a specific header with a specific cat-back system. I think the two are mostly independent in design. BTW...I am the only one with BRM exhaust.
Sorry to say again, but 99.9% of all your header questions for the Q are covered in the archives between my headers and our Aussy friend Ash headers. All of this information has been discussed in the past 6 months so please do a search and enjoy reading for several hours. I just joined NICO this past February and knew nothing about the Q for which I have owned since 1998. I have done countless times a search through the archives and still do repeated searches to learn and relearn about the Q.
Are the runners equal length? No....they are not equal length but are much better than OEM manifolds as far being closer to equal length.
It appears that one of the headers is shaped much differently than the other. Will this cause any problems? No....it should not be of any significant obstruction in the flow as the etreme bend is due to the steering shaft just like the OEM drivers side manifold.
Did they take this into consideration when the headers were being "engineered"?.....well yes and no. They did not build a "step down" header, but tried to build as close to equal length as possible. It is about impossible to build an equal length header for a Q45 becuase of the very limited space available to wrap the pipes around.
Did they take this into consideration in BRM cat-back exhaust for the Q45?The BRM exhaust was on the car when they fabricated the headers, but I do not think that CAT-Back exhaust really affects the desgin of the headers as I have never heard that you need to use a specific header with a specific cat-back system. I think the two are mostly independent in design. BTW...I am the only one with BRM exhaust.
Sorry to say again, but 99.9% of all your header questions for the Q are covered in the archives between my headers and our Aussy friend Ash headers. All of this information has been discussed in the past 6 months so please do a search and enjoy reading for several hours. I just joined NICO this past February and knew nothing about the Q for which I have owned since 1998. I have done countless times a search through the archives and still do repeated searches to learn and relearn about the Q.
Re: (AZhitman)
Greg.....just curious as to the following:AZhitman wrote:A second set of headers, utilizing a "stepped tube" design, much like Borla's Cobra headers, are being fabricated, and are expected to provide more low-end grunt than the current design.
who is builder of the new headers?
who is the buyer?
when will they be available?
how are they expected to provide more low-end grunt than the current design when nobody besides myself has ever tested or even dyno the current design? Is this just based off the fact of the stepped tubing?
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AZhitman
- Administrator
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- Car: 58 L210, 63 Bluebird RHD, 64 NL320, 65 SPL310, 66 411 RHD, 67 WRL411, 68 510 SR20, 75 280Z RB25, 77 620 SR20, 79 B310, 90 Z32, 91 GTi-R, 92 Silvia Qs, 98 S14, 23 Z.
- Location: Surprise, Arizona
- Contact:
Good post above Rob. We were typing simultaneously!
Actually, I have another set with a gent in CA who wants nothing to do with forums (I suspect he's significantly older)... 94 Q, also has the 4.08. His reported dyno numbers were not what I had expected, at 17hp.
You're right on the money - The stepped-tube ones are a shot in the dark, and they have no "buyer" yet. They will likely go on my Q this winter, if they're done by then.
"Pay-as-you-go" makes for slow progress.
I shoulda been an actuary.
Actually, I have another set with a gent in CA who wants nothing to do with forums (I suspect he's significantly older)... 94 Q, also has the 4.08. His reported dyno numbers were not what I had expected, at 17hp.
You're right on the money - The stepped-tube ones are a shot in the dark, and they have no "buyer" yet. They will likely go on my Q this winter, if they're done by then.
"Pay-as-you-go" makes for slow progress.
I shoulda been an actuary.
peak hp/torque is one thing but higer average overall hp/torque is what I think most people want. I don't think that my peak hp has increased anything significant, but I do know that my hp curve must be much more flat towards the redline as the car pulls very smoothly till redline with no more drop off like I use to have at redline. Therefore I think that I have a much higher overall weighted average from 4,000-6,900 rpms than stock.
How is the guy just selling headers and not the whole car? Seems strange that he would sell just the headers and not the whole car if it already is built up with other performance goodies.
So do you physically have the other headers or not and do they have the EGR thingy?
post pics of the other headers if you got em...like to see them and how the design looks.
don't be an actuary...they are all a bunch of socially dry boring group in general. I would not be an actuary, but I just so happen to be good in the math/statistics area and so the job found me I did not find it.
How is the guy just selling headers and not the whole car? Seems strange that he would sell just the headers and not the whole car if it already is built up with other performance goodies.
So do you physically have the other headers or not and do they have the EGR thingy?
post pics of the other headers if you got em...like to see them and how the design looks.
don't be an actuary...they are all a bunch of socially dry boring group in general. I would not be an actuary, but I just so happen to be good in the math/statistics area and so the job found me I did not find it.
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AZhitman
- Administrator
- Posts: 54542
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- Car: 58 L210, 63 Bluebird RHD, 64 NL320, 65 SPL310, 66 411 RHD, 67 WRL411, 68 510 SR20, 75 280Z RB25, 77 620 SR20, 79 B310, 90 Z32, 91 GTi-R, 92 Silvia Qs, 98 S14, 23 Z.
- Location: Surprise, Arizona
- Contact:
The guy in CA is not selling them, he bought them. I just put him in touch with the shop, as it's not really worth it for me to continue with that project...
Other set is not built beyond flanges yet, but I suspect, based on your direction, that including the EGR would be wise. Should look identical to yours, just with a slight "step" (1/8") 2" from the flange.
Other set is not built beyond flanges yet, but I suspect, based on your direction, that including the EGR would be wise. Should look identical to yours, just with a slight "step" (1/8") 2" from the flange.
okay....now you have me really confused.
Where did the CA guy buy the headers from? The shop that did my headers?
EGR? Well I have not had any problems besides a thrown engine code 2 times per month and that is all that I know. I would have opted to keep the EGR hooked up even if there was not enough back pressure to operate fully it could do no harm at the very least. Also my MPG went from very high teens 18/19 consistently to 14/15 as I now get between 280-300 miles to one tank vs. 350+ miles per tank when it was OEM. Still better than some are getting MPG wise from what I hear on others MPG's.
So does the shop that is building the other set actually have a set to make a copy from or are they just going on pics?
Where did the CA guy buy the headers from? The shop that did my headers?
EGR? Well I have not had any problems besides a thrown engine code 2 times per month and that is all that I know. I would have opted to keep the EGR hooked up even if there was not enough back pressure to operate fully it could do no harm at the very least. Also my MPG went from very high teens 18/19 consistently to 14/15 as I now get between 280-300 miles to one tank vs. 350+ miles per tank when it was OEM. Still better than some are getting MPG wise from what I hear on others MPG's.
So does the shop that is building the other set actually have a set to make a copy from or are they just going on pics?
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PoorManQ45
- Posts: 16676
- Joined: Fri Jul 02, 2004 5:13 pm
Re: (rsiwicki)
Why would an exhaust modification cause your MPG to go down? Is the decrease actually caused by any of your mods. Or is it because you like to step into the throttle alot?rsiwicki wrote: Also my MPG went from very high teens 18/19 consistently to 14/15 as I now get between 280-300 miles to one tank vs. 350+ miles per tank when it was OEM. Still better than some are getting MPG wise from what I hear on others MPG's.
Re: (PoorManQ45)
Removal of EGR causes MPG to go down. Nothing else should really affect gas mileage.
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elwesso
- Posts: 30810
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- Car: 94 Infiniti Q45t 5 spd
2007 BMW M Coupe
2007 Infiniti G35 S 6MT - Location: Indiana
- Contact:
Re: (rsiwicki)
I dont think your MPG should be decreased by removal of the EGR...
On my old Q, i got 22 mpg on the highway with no egr for over a year.....
On my old Q, i got 22 mpg on the highway with no egr for over a year.....
http://www.autoshop101.com/forms/h61.pdf
"By integrating fuel and spark control with the EGR metering system, engine performance and fuel economy can actually be enhanced when the EGR system is functioning as designed."
Designers may rely on exhaust scavenging to suck fumes out of the chamber to make room for the incoming charge, thereby increasing volumetric efficiency.
"By integrating fuel and spark control with the EGR metering system, engine performance and fuel economy can actually be enhanced when the EGR system is functioning as designed."
Designers may rely on exhaust scavenging to suck fumes out of the chamber to make room for the incoming charge, thereby increasing volumetric efficiency.
Re: (elwesso)
Quote »Besides emission EGR percentage is critical in reducing cruise pumping losses and improving highway mpg![/quote]Wes....the above quote is from the one and only Q45tech and there are countless other articles on how the removal of the EGR affects MPG.