My built TT 370z is getting tuned today... What power can I expect?
 

Done, made 700 after upgrading full system.

If I had to make a wild-*** guess, you'd want to stop around 500whp. Going too much higher sounds sketchy to me with the fuel system you described. The good news is that you should be able to make a ****-ton more power down the line with a bigger pump/injectors/fuel return system.

Good to know :)

Yeah, for now just want the car tuned to a safe level. I'll probably get used to it in a month or so and want to push for more power. 750whp on pump was the original goal, hoping to hit that with a full fuel system on 92 octane.

Who built the block? Will be in for reviews of that. We had a built block blow locally during the break in period and the builder is blaming a foreign object making it into the cylinder or timing causing the piston to hit the valve (or maybe their valve stuck and was hit by piston).

My built TT 370z is getting tuned today... What power can I expect?
 

I have a stock motor, same fuel pump and 600cc injectors. Made 550whp with no knocks. Only 10.7 lbs of boost. You should definitely be able reach 600whp, or close to it on your setup. Posting vids!?!


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Yeah, but you get better gas in Florida. I'm sure there's 600 in it, but if the plan is to later add fuel and really put that built motor to use, he might want to stop short of the ragged edge. It would really suck to pop the built motor before it can be really pushed.

You’re right. What he can hit vs what he should run are two different things lol. Gas down here ain’t bad. Most stations have 93, and E85 is gaining popularity as they build more pumps. But definitely better to tune it down to a safe number. I’ve had no issues at all where I’m at and I got tuned back in October, drove it all the way to North Carolina and back less then 12hrs after.


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Those tiny .48 a/r turbines will hold you back. With a built block you should have opted for the .63's for sure.

Your will see your torque climb hard and fast, and your HP will taper off quickly after 6k rpm when you start ramping up the boost.

His built block has lower compression than your stock block.

He won't make that, he lowered the compression from 11:1 to 9.5:1. This will be a major hurdle to overcome.

Good point. I overlooked that.


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:iagree: Also you can add that the GT-R manifold conversion will kill the power past 6k.

A shop in Langley BC (Canada) called Independent Speed Shop - they do a ton of high hp GT-R builds and just have a lot of crazy stuff come out of there.

I'll definitely ask the tuner to keep power a decent away from the limit, wherever he finds that may be once it's tuned in a few hours.

Yeah, I've thought about this - I actually didn't opt for a new turbo setup, I've just reused the original setup the car had when I bought it.

I would ideally like to push these turbos to their limit before upgrading. I'd like to hit the 700whp to 750whp mark while still maintaining the enjoyable drivability and power band this turbo setup has provided. There's very, very little lag. It was sooo fun to drive before it threw a rod.

I upgraded to the GT-R manifold as I've heard horror stories of manifolds starting to bulge and eventually leak when approaching the 20psi+ mark. I just didn't want to have to deal with that happening. Plus it looks cool - lol!

Gotta be getting closer to your turn..... :)

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No way you're reachign 750 on pump. The way it sounds. You need to do some major research before trying to reach your power goals. I don't understand why you want to push the build to it limits. Limits= kaboom either your motor or something else, unless you have endless pockets, then hell yeah. Instead of wasting your money on that manifold you should of invested in a return fuel system, maybe some ID 1700 injectors, maybe a twin pump set up, lsd or clutch ( hoping you already have those upgrades) or add a stronger oil pump or add a baffled oil pan.

Hopefully you made it on the rollers & got a tune,
Should have some decent numbers!

Why did you opted for now on a proper return fuel system? Sure with a good build and proper tune you should be fine but honestly you should have install that fuel return. Rated 720 cc injectors and 320 lph fuel pump plus lowering the compression you will have to push the turbos harder to reach lets say 500whp than someone with 11.1 compression ratio. I lower the compression on mine and i didn't skip on a return fuel system and believe me is harder to reach the numbers you want. Your limiting factor right is what will help you the most achiving what you want....FUEL!

So, longer story my cars been at this shop for 13 months after a lot of ups and downs. The money aspect isn't the problem, I'd just like to have my car back at this point and not wait another however many months. Fuel system upgraded will happen sooner than later.

Clutch was upgraded to one rated for > 800wtq, that shouldn't be a problem. Nismo oil pump used, lsd wasn't upgrade - I've never heard of them being an issue. The car is a nismo so idk if it has a better lsd / better axles than the other models.

Builder / tuner said it probably won't be needed for < 600whp even on 9.5:1 compression.

Honestly I'd get your car out of that shop as soon as possible! 13 months for a tuner who doesn't know anything about 370Z's?

I've built a GTR from the bottom up including a new fuel system, flex fuel, new turbos, engine dismantled to the short block and sent out to be rebuilt, shipped back and assembled by myself and then tuned all within 6 weeks.

Don't make the mistake many others have done and keep it in a shop rotting away. I haven't seen a 13 month build in a while unless it's a completely custom car..

Hopefully this won’t be another case of I told you so. Judging from his comments he knows just as much as his tuner/ builder about the z34 chassis. Darn shame

Lsd needs to be upgraded if you quote on quote want to make 700whp, or you will learn the hard way when the car sends you onto on coming traffic or a ditch.

“The car is a nismo so idk if it has a better lsd / better axles than the other models” that is what I was referring to about doing some research, my friend you are going down a very expensive road that isn’t for the good.

I would feel more comfortable with a Aeromotive 340lph and 1,000cc injectors and still i wouldn't aim for 600whp without a return fuel system since also lowering your compression you will need more boost than someone with an 11.1 ratio and you will hit a wall with the fuel aspect! Just my opinion

You got the same axles as everybody else. As for the VLSD. It's junk. When they get hot. It's the same as an open diff. One wheel peeler.

Should of went to Drift office, Shop is 30 mins away from you and is a smaller Business you could of supported that does great work.

I know Bob (the owner) and actually talked to him. I would of been happy for him to take on the project. They however do builds from the ground up and didn't want to deal with my existing 1 off turbo kit setup which is understandable since they don't want liability if the car breaks from some part they don't stand behind.

Understandable, hope everything works out for you man!

So, here's a bit of an update.

We got the car tuned on the dyno with the current injectors and 340lph pump. The pump itself started to act odd around the 450whp mark & 12psi or boost. We're thinking it may be bad since I don't know how long the previous owner had it in the car. Also the car was previously tuned on the factory map sensor, we're already maxing it out so upgrading to a 3 bar sensor as well.

Regardless of that though, we said screw it and are just upgrading the whole fuel system now to not have to deal with it later.

End of week we'll be installing id 1050x injectors, Wahlbro 485lph pump, cj motorsports full s1.se fuel system kit and proper map sensor. Big power will come then!

Here's a video of the car on the dyno and making 450whp~.

https://youtu.be/cRut2ZIYuJ0