52,000 mile re-dyno with greddy TT
 

today i had a chance to put the car on the dyno and see where it is. I have 52,000 miles on it now, and beat on it daily... I was curious if it was down any power or not.

2 years and probably almost 40,000 miles ago, it made 524rwhp at 7.5 psi. After a couple weeks, i turned up the boost to 8.5-9, sometimes a little more. I was also curious what it made up there but never really had a convenient opportunity to find out.

the car is my daily driver. the only thing that has yet to require service was the differential mounts. The rear mount blew out a couple weeks ago from too much no-lift shifting, etc. I swapped the mounts out for whiteline urethane mounts. which feel like stock (except not broken). I do think that my engine mounts are toast though, I feel the engine moving quite a bit. Going to swap in solid mounts in the next week or two. Other than that, I literally NEVER work on this car. Its been a rock.

Anyway, it made 586rwhp at 9psi. I really wanted to push it a tad harder just to hit a 600... I probably should have, would have only needed half a psi of boost and/or a degree of timing. Or I could have just waited out a couple hours until the outside temps dropped 20 degree. But its fine for now.

I can say from experience that running your 370z turbocharged, assuming its well tuned and well sorted, at 550rwhp all day every day, is rock solid reliable. But I do think that if I were to put it into severe duty, such as road course driving... I would dial it back to 500rwhp, maybe lower the rev limiter a couple hundred RPM, and go nuts on the cooling system. I imagine needing the best brakes, suspension, and tire setup to manage that.

EDIT: Re-reading my post makes me realize that I left out some important facts for anyone who is really big into number crunching. I did not gain 62HP with only adding that 1.5psi of boost. I also added a little bit of timing above 6000RPM. So when I first got on the dyno this session, I was making identical power at 7.5psi as I was 2 years ago. When I turned it up to 9psi, I was displeased to see it in the 560s because I was convinced that the car was going to be at almost 600rwhp. I would have sworn it was almost 600, and I had even told some people that I thought it was probably almost 600 by now, so I decided to make it almost 600rwhp by giving it the timing I could tell it wanted anyway.

After adding the timing last night, I didnt think to try another 7.5psi pull. but I would guesssssstimate maybe 540 something at 7.5 now.

Nice numbers

Thanks. Now I gotta make the decision I've been talking about for a long time... To build the motor or not. It's treated me so well, I am not sure i should even touch the dang thing. I really like to swap the pistons and rods and move to the FI turbo kit and crank her out to 800-850rwhp or so... We will see what the future holds!

While I agree that the engine is very strong compared to the previous generation of VQ series but Im not sure if it can handle the power for ever.

Trust me I beat the sh!t out of the car every single time i press the ignition button on and the engine was running like a champ and i almost thought that these internals come forged from factory, but wanted to move on before its too late.

Yes who knows how long it will go... But lets not forget one major factor.. Historically, 75% of built VQ engines never last a year, or anywhere near the mileage I'm at now. With a fully built setup, you're always rolling the dice that your car will never achieve dependability again.

Good to know it can do a hard 40K without major issues

Do you have a build thread/mod list?

I started a build thread but I never completely finished it. I have an album with some pics.

The config is pretty basic..

Greddy TT with Tial BOVs, custom oil line setup, custom wastegate tubing
Aeromotive Stealth 340lph
CJM Fuel Pump Install Kit
ID1000cc Injectors
Custom Earls oil cooler kit, like ($250 in parts)
Greddy Exhaust
UpRev software, tuned by me, on E85
GTR spark plugs (installed last summer, was on original plugs until that)
White line diff mount
HKS boost controller

Then of course irrelevant things like brakes and wheels and springs. OSGiken twin clutch with zspeed CSC

That's just fantastic

I suppose worthy of mention is that I have reached the max of the fuel system. Fuel pressure at the rails is falling off near redline. Not enough to make me back it off.

Keep in mind, this is with e85, which is a lot more fuel than gasoline. With gasoline, my fuel pressure would still be steady.

I will either swap in our CJM stage 0 return conversion, or perhaps go all the way with our billet FPD rails and upgraded stainless pipes.

Also, the stock MAF sensors, in the larger Greddy pipes, are almost maxed out. I'm hitting around 4.7 - 4.8v... So I think I can only go another 30-50hp before the sensors are bottomed out and my fuel enrichment stops. So if I were to build the engine and keep this setup, I would need to move up a tubing size for the MAFs

My car

Love the plate and meaty rear tire setup

Now that's a 370Z done right!!

Nice numbers man!! Great to see its still going strong. :/ mine only made 6k miles :(

Just goes to show how good our motors actually are. I would stick with what you have for now, if it's not broken don't fix it!!!!