300hp coupe?

[SpdFreak]

We are talking about modifying an air filter assembly, not an intake manifold.

I wrote about the intake manifold just to bring a piont across.

And yes, air + fuel = more power, but(air + fuel) multiplied by (tuning and the right parts [ie. only replacing restrictive parts]) = a faster car.

[generic808]

Most, if not all cars come from the factory with cost and effeciency in mind. Most cars have restrictive intakes and exhausts. Just opening up those two things lets your car breathe better, thus creating more power. Even if the parts weren't "tuned" to your specific vehicle, just getting more air into your combustion chamber will provide more power.

[rjdmmfl1]

Generic, you seem to be pretty knowledgable about things...what's your opinion on this little gadget? Or anyone else that knows about engines...

http://cgi.ebay.com/ws/eBayISA...US:11

+20HP SPEED CHIP NISSAN MAXIMA/ ALTIMA/ Z/SENTRA 89-08

Read what the guy sent to me...

Dear rjd_mmfl, The mod basically tricks your engine into reading a different outside temperature. This alters the fuel to air ratio and gives you an extra boost. - onestopshop10

[shift_mikey]

Generic, you seem to be pretty knowledgable about things...what's your opinion on this little gadget? Or anyone else that knows about engines...

http://cgi.ebay.com/ws/eBayISA...US:11

+20HP SPEED CHIP NISSAN MAXIMA/ ALTIMA/ Z/SENTRA 89-08

Read what the guy sent to me...

Dear rjd_mmfl, The mod basically tricks your engine into reading a different outside temperature. This alters the fuel to air ratio and gives you an extra boost. - onestopshop10

As i mentioned earlier in this thread, the use of a specific value resistor in place of/piggy backed into a Manifold Air Temperature or Manifold Air Pressure can fool the ECU into thinking the air is COLDER (more dense, requires more fuel to keep air/fuel ratio 14.7:1) or that more barametric pressure (again, more dense) is higher and requires more fuel.

The downside to a mod like this, is if your telling the ECU that there is more air available and there is not, then the engine starts to add more fuel when it doesn't need it, makes the A/F mixture too rich, and causes excess carbon build up and possibly black smoke from exhaust.

[II Knucklez II]

And what would that give you? Where could you possibly unleash 350 horses (or even close) if not at a track?

dont know what u mean by the first sentence but i could unleash 350 or 400 hp on a high way and like you said at a track

[generic808]

Funny thing you bring that whole chip thingy up. We were talking about that very same thing on the first page of this thread. And as mikey said, it's basically fooling your engine into "thinking" it's getting colder air. This type of mod has been out for a very long time, but I wouldn't mess with some crappy thing like that.

30HP for .98 cents?? Come on now! If it sound too good to be true, it is.

[dldjros69]

i agree with generic, 30 hp should cost more like 500 to 1500 dollars. Even if you trick the engine into thinking there is colder air, the air is the same temp, so just cuz the gas is richer doesnt mean u will get any more horse power.

dont do it its a scam

[SpdFreak]

Has anyone heard of the Throttle Body coolant bypass mod? I saw it on ebay, but I know alot of Maxima guys were doing it.Ebay Link: http://cgi.ebay.com/ebaymotors...wItem

You can do this yourself for a couple of dollars from auto zone.

IIRC it routs the coolant tube around the TB instead of through a passege. The coolant runs through there to aid in warm up, but once it's all warmed up, the cooant is heating up your air passing through the TB. I don't think the claims on the dyno graph in the ebay listing are true but some one should check this out.

Can some one get me the FSM for this car? I want to compare parts, to the maxima, and older 350z (the one with the VQ35de)(new one has the VQ35HR).

[generic808]

Has anyone heard of the Throttle Body coolant bypass mod? I saw it on ebay, but I know alot of Maxima guys were doing it.Ebay Link: http://cgi.ebay.com/ebaymotors...wItem

You can do this yourself for a couple of dollars from auto zone.

IIRC it routs the coolant tube around the TB instead of through a passege. The coolant runs through there to aid in warm up, but once it's all warmed up, the cooant is heating up your air passing through the TB. I don't think the claims on the dyno graph in the ebay listing are true but some one should check this out.

Can some one get me the FSM for this car? I want to compare parts, to the maxima, and older 350z (the one with the VQ35de)(new one has the VQ35HR).

Here's the FSM courtesy of Tyler: http://www.nicoclub.com/FSM/Altima/2008/I have the actual disk, so if you want a copy, let me know.

I read about that TB bypass, but honestly, how much of a difference would something like that really make? Think about it, the TB is cooler, but the air passing through is already warm. I don't know how much of a difference it would make considering the velocity of the air passing through is pretty fast. Its not like the air is actually going to get any hotter in that short 6 inches or so. And I definitely know that the throttle body is not going to make the air passing through any cooler. It may sound good on paper, but I honestly don't think it has any real world benefits. Just my opinion though. I know some will swear by it, but if it's that easy, why wouldn't "factory tuned" cars like the SE-R, NISMO, WRX STI, LANCER EVO and others use something like that, especially if it's that cheap and that simple?? Think about it

[SpdFreak]

Here's the FSM courtesy of Tyler: http://www.nicoclub.com/FSM/Altima/2008/I have the actual disk, so if you want a copy, let me know.

I read about that TB bypass, but honestly, how much of a difference would something like that really make? Think about it, the TB is cooler, but the air passing through is already warm. I don't know how much of a difference it would make considering the velocity of the air passing through is pretty fast. Its not like the air is actually going to get any hotter in that short 6 inches or so. And I definitely know that the throttle body is not going to make the air passing through any cooler. It may sound good on paper, but I honestly don't think it has any real world benefits. Just my opinion though. I know some will swear by it, but if it's that easy, why wouldn't "factory tuned" cars like the SE-R, NISMO, WRX STI, LANCER EVO and others use something like that, especially if it's that cheap and that simple?? Think about it

Theres a simple answer to why factory "tuned" cars don't have these little mods. Nissan has it there because they don't know if the car will be used in Albany, NY or Miami, Florida, so to be safe, and ensure that the car will start up smooth, they used this design figuring that this along with some other ideas would help the car with cold starts.

Like I said, I don't think the gains are 8hp like the ebay auction claims, but I do think it may be worth a try, esspecially if someone is doing a CIA.

Another thing that we should look for is the spacers (forgot who sells them) that people use on the 3.5 Maximas. These spacer/gaskets privent heat transfer between the engine and the IM, engine and headers, TB and IM...I think they may be called pletonic spacers but i'm not sure.

We should also speak to Cattman Performance, Hotshot headers and Warpspeed Performance to see if they want to make headers and exhaust components for this car.

Cattman Performance is known to be one of the best headers on the Maximas...So is anyone wants to see if we can bring them along, and onto this site that would be good too.

[generic808]

HotShot went down a while ago. I loved their headers! Was running the ceramic coated on my old SE-R and that was the single best gain I got beside the 50 fogger shot of laughing gas.

Those things are called throttle body spacers I believe, and I believe they're just a big waste of money. You should get one of those ($60-$75) and add that TB bypass and tell me what you think. Dude, you're wasting your time and your money. Period. If you believe they work, get them and dyno your car befor and after and show the results. I think what you'll gain from those mods is a placebo effect. At least you'll think you've gained power and that's all that matters, as long as you're happy. You'll waste you money on the spacer; your time on the TB bypass; and more money on the dyno runs. Good luck!

If you want any gains to be seen via the throttle body, have it ported out.

Bigger bore = bigger air = bigger power

[SpdFreak]

HotShot went down a while ago. I loved their headers! Was running the ceramic coated on my old SE-R and that was the single best gain I got beside the 50 fogger shot of laughing gas.

Those things are called throttle body spacers I believe, and I believe they're just a big waste of money. You should get one of those ($60-$75) and add that TB bypass and tell me what you think. Dude, you're wasting your time and your money. Period. If you believe they work, get them and dyno your car befor and after and show the results. I think what you'll gain from those mods is a placebo effect. At least you'll think you've gained power and that's all that matters, as long as you're happy. You'll waste you money on the spacer; your time on the TB bypass; and more money on the dyno runs. Good luck!

If you want any gains to be seen via the throttle body, have it ported out.

Bigger bore = bigger air = bigger power

Heres the link to the spacers: http://www.nwpengineering.com/....html

Phenolic Thermal Intake Manifold Spacer Kit (Front Wheel Drive VQ35DE Nissan/Infiniti)

Dude, you're wasting your time and your money. Period.

I'm not doing any of these mods..well at least, not yet. I don't even have the car yet.

If your so sure your the you know your stuff about this car, go show us the way, and put your car past the 300HP mark, with a goal of doing it as cheap as you can. This will test your ability to decide which mods work and which don't.

[lil_z_33]

just picked up a legacy GT...simple computer upgrade adds 60hp...just waiting to hit about 10000km and reprogram that ECU...

apparently nissan ECU's are really hard to tweak, but it'd be cool if it could be remapped similar to the 350Z for some hp gains...

[bigred311]

well guys very shortly we will be finding out if the CVT can handle around 300hp, because im doing a custom intake, full cat back, seeing if i can do custom headers, and a few other things are being checked out to see if they're possible, because i figure if i break the transmission ill just put a 6MT in instead.... wish me luck

[AltiCoupeDriver]

Way to take the risk, be sure to let us know how it turns out.

[Ormand]

Some of you should actually look under the hood sometime. The intake spacer is for the 3rd gen engine. The 4th gen engine has a plastic intake manifold, while the previous engine had aluminum. There is very little to be gained, if anything, by adding plastic spacers to a plastic manifold.Oh, and I'm sure that every part in the manual trans was designed for 500hp. Nissan would certainly spend the money to have a transmission "overdesigned" by more than 50%, and they wouldn't mind having the weight penalty and the additional cost, either. Doesn't matter which trans you have, adding power is going to put more strain on it, and increase the risk of breakage.

[shift_mikey]

Doesn't matter which trans you have, adding power is going to put more strain on it, and increase the risk of breakage.

Aw man! SHIFT_COUPE, you hear that? you can't go with overboring, stroking, huge cams, twin turbo, and 200 shot of NOS! your transmission just won't take it!

N.S.S.! I don't expect a manual transmission to take unlimited horse power. I'm suggesting that the 6spd will stand up to more HP then the CVT. Are you willing to argue otherwise?

There is very little to be gained, if anything, by adding plastic spacers to a plastic manifold.

Last time i checked, throttle body spacers don't make power because they are plastic . They work by creating turbulance in the intake manifold. The theory is, if the air is "more voilent" when entering the engine, the fuel atomizes better and produces more power due to a better air/fuel mixture

[Ormand]

Last time i checked, throttle body spacers don't make power because they are plastic . They work by creating turbulance in the intake manifold. The theory is, if the air is "more voilent" when entering the engine, the fuel atomizes better and produces more power due to a better air/fuel mixture

Last time I checked, this comment was completely and totally WRONG! The manufacturer of the phenolic spacers is a company not far from here. There is another forum, with a long thread discussing the spacers. The function of the spacers is to prevent heat from being transferred to the manifold, and heating the charge. The idea of the spacers creating turbulence is totally off base. Perhaps some education would help you make more useful comments.

[shift_mikey]

Last time I checked, this comment was completely and totally WRONG! The manufacturer of the phenolic spacers is a company not far from here. There is another forum, with a long thread discussing the spacers. The function of the spacers is to prevent heat from being transferred to the manifold, and heating the charge. The idea of the spacers creating turbulence is totally off base. Perhaps some education would help you make more useful comments.

yes yes, lets make a plastic throttle body spacer that doesn't let heat transfer to an object that has engine coolant running through it!!

Got any links?

[shift_mikey]

"The throttle body spacer causes the incoming air charge to tumble for better atomization of the mixture downstream in the combustion chamber." - http://throttlebodyspacer.com/

" As the intake air passes through the spacer, the Helix bore creates a vortex action that improves atomization creating a more complete combustion and an efficiently burning engine. " - http://www.airaid.com/

" causing the incoming air to tumble and rotate like a tornado. The resultant effect is the easy breaking up of the air stream, causing the droplets of fuel to atomize more thoroughly and creating a very fine air-fuel mixture." - http://pr-gb.com

Ok i got bored after five minutes of google-ing.

The principle of vortex based throttle body spacers are to increase turbulance thus mixing atomized fuel more completely.

I AM NOT familiar with any other kind of throttle body and what their purpose may be.

EDIT: Ok so i decided to google phenolic spacers. Looks to me like they are only designed for throttle body injection, and carburetors. Those are 2 devices were fuel is meeterd in the TBI/carb itself. The idea was to prevent heat transfer to the TBI/Carb, not keep heat away from the manifold (as you posted). Further more, they are more commonly refered to as "insulators", and i don't see them available for any more current, direct injection fuel systems.


Modified by shift_mikey at 4:18 AM 10/18/2007

[Ormand]

yes yes, lets make a plastic throttle body spacer that doesn't let heat transfer to an object that has engine coolant running through it!!

Got any links?

Got links? Absolutely. If you notice, where the spacers are listed, there isn't one for the 2007 Altima. Why? Because the 2007 Altima has a plastic intake. If you read, you will also note that the spacers come with a throttle body coolant bypass fitting. Here's the link:http://www.nwpengineering.com/

[shift_mikey]

I kindly thank you for your insight on phenolic throttle body/intake manifold insulators. Definitly not the same thing in which i was refering to (air disrupting spacers)

Whatever floats your boat. I don't plan on getting either LOL

[Ormand]

I kindly thank you for your insight on phenolic throttle body/intake manifold insulators. Definitly not the same thing in which i was refering to (air disrupting spacers)

Whatever floats your boat. I don't plan on getting either LOL

The very first mention of the spacers was in a post by SpdFreak. He provided the same link that I just gave. For some reason that made me think we were talking about the phenolic spacers that he asked about. Of course I should have understood that all subsequent posts were about something totally unrelated to the original question.

[shift_mikey]

I clearly missed that post. After reviewing the early portions of the thread, i came across it. Sorry for the confusion

[Cali 2 Balti G]

Is this the type of spacer you guys are referrring to?

http://www.g35parts.com/9083/o...d=298

or this one

http://www.g35parts.com/9083/o...d=319

I plan on doing the intake, spacer and exhaust to get an additional 25-30 or so horsepower out of the G.

[sicride]

With my somewhat limited knowledge of engines and the specifics on Altima Coupes. I do know that they WILL have exhaust and intake differences. Which on older 3.5 SE Altima sedans intake, headers, and exhaust have been known to create considerable increases in horsepower. I unfortunately have not seen a base 3.5SE Altima Coupe dyno graph to see the actual power put down as Nissan's rated horses have been known for years to be utter bullsh*t. (Esp. Maxima and Altima 5hp increases almost every model year and then magically decreases too at times).

Anyhow for the 3.5 in the new 350z's there has been a number of changes. If you wanted to honestly know how they got there, it isn't even the same engine. It is a VQ35HR which has a higher compression ratio, different cams, different exhaust, and a different intake plenum. The Stock intake plenum has been known to be one of the biggest restriction on horsepower for the VQ35DE. Of course any changes to the intake and exhausts on newer vehicles require tuning of the ECU to get the most of the gains as it has been common to LOSE horsepower in newer vehicles with mods.

At this point you will not likely get 300hp with a 3.5 Coupe unless you do some rather significant changes, including intake plenum and cams. Or going some sort of forced induction route such as Nitrous/Supercharger/Turbo setup. It is nearly impossible to gain 40hp from a NA V6 with simple bolt ons. Good luck though

[Plastics]

I was able to confirm that I got 291 horsepower on my 08 3.5 SE coupe. I pump in Sunoco 94 and ran the dyno and surprise..surprise..

I thought something was amiss and yesterday, I put in mid-grade Chevron 89 octane and dyno again at 258 hp....really feel sluggish.

it does make a difference when the weather is cooler for more hp

[shift_mikey]

I was able to confirm that I got 291 horsepower on my 08 3.5 SE coupe. I pump in Sunoco 94 and ran the dyno and surprise..surprise..

I thought something was amiss and yesterday, I put in mid-grade Chevron 89 octane and dyno again at 258 hp....really feel sluggish.

it does make a difference when the weather is cooler for more hp

post dyno print out

[generic808]

I'd have to second that Your stock Altima does not have 291HP!! Can we see some charts on that dyno of yours?

Running a 2-3 octane higher gasoline will not magically give you 21HP!

[dldjros69]

So all that yam yam that was talked and nothing.

I went to the pump and put the best gas in

my car is really flying now lol

I may be wrong but when i bought my car, the guy who sold it to me said that going with a higher gas doesn't really make much of a difference