My latest exhaust mod, a.k.a. Turbo Q45

[sijoko]

Well, it's been a while since I last posted. I moved from Dallas to Oregon and have been busy lately. But now I have some time to finish up the work on my 94 Q45. Anyway, I wanted to share my project with you guys.

More pictures can be found in the Q45 section at:www.turbo-infiniti.com






Modified by sijoko at 1:43 AM 3/29/2007

[qsiguy]

That's pretty exciting! You are a little ahead of me tho dang it! I was hoping to be the first. I'm doing a rear mount setup tho. Can you please share whatever info you have so far? What turbo are you using, what are your tuning plans, etc.

Where are you routing the exhaust and intake plumbing? I'd love to see that as well. Share some more photos please.

Oops, nevermind. I just saw your link. I went over there and joined up to keep tabs on your progress. Still like to know which turbo you selected and such.
Modified by qsiguy at 11:35 PM 3/28/2007

[Ozzie]

All of a sudden, my eyes have been opened.......

Anyone have a dead injector that they want to send me? (So I can source a direct replacment with higher flow capability)

I think things just got a bit more interesting for the future of my Q

[Jesda]

I have chills. I would totally rock this!

Ozzie: How much would it cost me to ship you my dead injector?

[bullittandy]

Great initiative! Good luck and keep posting.

[Ozzie]

I have chills. I would totally rock this!

Ozzie: How much would it cost me to ship you my dead injector?

Could you weigh one for me?It would cost you nothing, I would pay for the postage.I think it was around $10 for the 2 caliper bolts that GQJay sent me.I suppose you could take one to a post office near you, and get them to give you a quote, or search online for a postage cost calculator?USPS shows $4.95 for surface mail envelope, weighing 4 oz. (That would take 4-6 weeks to arrive, but I don't care about that)

[HashiriyaS14]

Mailing stuff to Australia actually isn't materially more expensive than sending things to Europe.

It's only pricey if you need to send via EMS, otherwise it's cheap.

[maxnix]

Interesting. Wonder how the airflow will be managed for the elevated under hood temperatures. Hood or fender louvers?

[sijoko]

What turbo are you using, what are your tuning plans, etc.

I'm using a large frame T-76 with a .96 hot side. The turbo is good for at least 930 hp, so I have room for expanding my power goals.

The tuning will be handled by a combination of a custom ECU programmed by Robert Bowen and a BEGI FMU, which is a boost referenced fuel pressure regulator. I also have a water injection system that will help in keeping detonation at bay.

I will be running 7 psi, which should put crankshaft power at around 420-440 hp. The system will be tuned by me using a NGK wideband monitor.

[sijoko]

Interesting. Wonder how the airflow will be managed for the elevated under hood temperatures. Hood or fender louvers?

Fender louvers are not really feasible on the G50. The strut towers are huge and will block any air flow out of the engine bay. The only options are either hood louvers, a reverse hood scoop or a hood vent.

All the hot side piping will be wrapped and the turbo will be ceramic coated but I will have to address the heat issue with some kind of vent.

[elwesso]

Looks nice........ Not sure why you had to start a seperate website AND forum, but whatever suits you I suppose.

[Jesda]

Could you weigh one for me?It would cost you nothing, I would pay for the postage.I think it was around $10 for the 2 caliper bolts that GQJay sent me.I suppose you could take one to a post office near you, and get them to give you a quote, or search online for a postage cost calculator?USPS shows $4.95 for surface mail envelope, weighing 4 oz. (That would take 4-6 weeks to arrive, but I don't care about that)

Oh hell, if its that cheap just give me your address.

[maxnix]

Not sure why you had to start a seperate website AND forum, but whatever suits you I suppose.

Say what, Mr. Q45.org?

Not only is youth wasted upon the young, but apparently so is free time.

[ScottJackson]

T76 seems a bit overkill, but I don't have room to talk since I haven't done anything toward turboing my Q. I'm gonna be going with something more in the range of a 60-1.

[Q_SHIP]

All I can say is about flippin time!!

[Unnatural1]

Nice work! This is the route I have planned. I haven't seen much interest though except for rear mount systems. I was starting to think I might be the lone turbo fanatic. I wished you still lived in the DFW area I would love to see your project.

[qsiguy]

Looks like we might have several turbo'd Q's shortly! Exciting for sure! Who's gonna be runnin first? I'm in the race and I'm well under way!

[TBrack]

looking good! I still want to sc though

[sijoko]

T76 seems a bit overkill, but I don't have room to talk since I haven't done anything toward turboing my Q. I'm gonna be going with something more in the range of a 60-1.

The problem with using a 60-1 is that at low boost, say 7 psi, it will be very inefficient on a 4.5 liter engine. The T-76 on the other hand will be in its sweet spot at 7 psi on the same engine. The bigger turbo is just more efficient. Plus, with the T-76 there is room to make more power later.

[elwesso]

Say what, Mr. Q45.org?

Not only is youth wasted upon the young, but apparently so is free time.

If you cannot see the difference between a SUPPORTING informational site and a possibly competing FORUM, i dont see how you can criticize either.

[elwesso]

The problem with using a 60-1 is that at low boost, say 7 psi, it will be very inefficient on a 4.5 liter engine. The T-76 on the other hand will be in its sweet spot at 7 psi on the same engine. The bigger turbo is just more efficient. Plus, with the T-76 there is room to make more power later.

Sijoko, how far away from completion are you? Seems to me from reading that you only have a few more things to tidy up, some management, and then you should be up and running.

[maxnix]

If you cannot see the difference between a SUPPORTING informational site and a possibly competing FORUM, i dont see how you can criticize either.

Whow, dude. Did we pull an all nighter? NICO needs a supporting site?

Hmmm...where's Yoda when we need him? Let the farce be with you, young Skywalker!

[maxnix]

The problem with using a 60-1 is that at low boost, say 7 psi, it will be very inefficient on a 4.5 liter engine. The T-76 on the other hand will be in its sweet spot at 7 psi on the same engine. The bigger turbo is just more efficient. Plus, with the T-76 there is room to make more power later.

Interesting this is all done with standard cast high static compression pistons. The only problem with non-fuel spray is it displaces air and fuel and thus reduces the possible amount of power.

[AZhitman]

Interesting this is all done with standard cast high static compression pistons.

IIRC, they're forged. I could be wrong.

The only problem with non-fuel spray is it displaces air and fuel and thus reduces the possible amount of power.

Not so - Water or methanol injection on this motor would allow sijoko to increase both boost and timing. Both bring combustibility into the equation (water brings O2, methanol is combustible in its own right).

Since the ECU doesn't support an additional fuel source, I'd love to see it set up with a Hobbs switch, set to spray at increasing intervals (boost-dependent).

[ScottJackson]

water does displace air and fuel, but the volume it keeps from entering the chamber is very minor compared to the cooling (anti-detonation) effect it provides. The trade off is well worth it. The 60-1 at lower boost levels will not be way out of it's efficiency range on this size motor. At peak rpm it may be getting close to the edge, but for the meat of the curve, it should be about perfect. The T76 will just be coming into its prime efficiency range at high rpm. I'm not claiming to be a turbo expert, but I know what's commonly done with 5.0L engines and the 60-1 works great for those up to around 12psi on a stock motor going to 6000rpm. Some 5.0L guys use the T70 on stock engines and do well with them, but the guys that use the 60-1 on the street love them because the spool up fast and provide lots of midrange torque while not falling off at redline.

[WDRacing]

AGreed, after looking at the compressor map, the 60-1 isn't a bad match for low boost at all. In fact it appears to be better then the T76. I'm only saying this for the guys who don't know how to read a comp map. Personally the T76 is a great turbo, especially if you plan to increase boost and power down the road. Why buy somthing twice I always say. Which is why I go big the first time as well. But I don't mind a little lag either.

Methonal injection is probably the best way to run high compression pistons and a decent amount of boost. I have a bunch of links to variable controllers for a DIY kit. Using a hobbs switch is an awful method. I've used variable controllers for along time now, they work awsome and when used with 100% methanol, you can usually add quite a bit of boost depending on the nozzle flow rates and positioning. Two nozzles mounted on top of the intake plenum work awsome for distrobution and you could swap out various size nozzles when adding boost etc.

WD

[Jesda]

Whow, dude. Did we pull an all nighter? NICO needs a supporting site?

Actually, three years ago when the site was created, NICO absolutely needed it. And when we switched to ZeroForum's worthless search engine, the site was more useful than ever. Now that Wes has updated the NICO articles section with tons of really great stuff, it isn't that important.Its also become stale because I stopped caring. I'm shopping around for an M30, Miata, Z32, E34, E30, Seville, Fleetwood... anything else, really.

Now, back on topic...

[WDRacing]

I'm shopping around for an M30, Miata, Z32, E34, E30, Seville, Fleetwood... anything else, really.

Now, back on topic...

Holy crap that's a broad spectrum of cars. You have the same issue I have, a love for almost all cars and a want to own them. You may be financially better off then I am, because there's no way I could buy more then one of those right now. You should add the Lincoln MK VIII to your list though.

[qsiguy]

I'm going with the T70 unless I find a killer deal on something else in the next few days. The map for that one puts me right were I want to be with room for improvement. I'll be starting around 5-6 PSI and will experiment at higher PSI's but I doubt I'll ever go over 8-10 as I don't want to tear into the motor. The map for the T76 looks like a great match as well but that thing is just too big and I doubt I'll ever take the boost up that high. Also, since I am installing my turbo in the rear I don't need as high of an A/R on the turbine side as you will. Exhaust gases will be taking up less space after a little cooling. In fact I may find that my T70 is a little too big. Just have to experiment with it but I think it will be great.

I will be using methanol injection but most likely only when I switch to the higher boost. I will be making a dual boost controller so I can switch it from the inside and will probably just tie the methanol to that switch and have a microswitch on the throttle to activate at WOT.

[WDRacing]

I will be using methanol injection but most likely only when I switch to the higher boost. I will be making a dual boost controller so I can switch it from the inside and will probably just tie the methanol to that switch and have a microswitch on the throttle to activate at WOT.

Having the kit boost activated is far safer and easier then using a WOT switch. Since you'll make lots of boost under loaded conditions without being in WOT. If it's a single stage setup, then a Hobbs switch is your best option. That way whenever you hit your predetermined boost level the alcohol/water will be available.

I ran a single stage setup on my Skyline for awhile before switching to a variable kit. I also used a dual stage boost controller, low boost was just pump gas, high boost triggered the alcohol. Worked like a champ. Although I was able to make copious amounts of power with the variable kit and two nozzles.

The bad part about mixing pump gas with methanol is the tuning. Using a wideband is limited because you're running two fuels with a different stoich. SO I found using EGT and AFR's was the best option. Yes it's another few hundred on gauges, but it's way worth it, especially if you can tie the overboost sensor into the EGT meter. SO either overboost or EGT will kill spark. Makes for a long lasting motor.

WD