Good morning. I have a question on expected performance gain from a TN Kit with some extras.

Currently I have a 6MT Base 350z with the following modifications:

TN Kit
RC440 Injectors
AEM Stage 1 Fuel Return
TurboXS Utec
Nismo Exhaust

I am looking into picking up a 3.3fd VLSD very soon but right now I have an open diff.

I had the car tuned and dyno'd at Performance Motorsport in Smithtown NY. The guys there are great and do what they can to make the customer happy with their car. They run a Mustang Dyno and my dyno sheet says my Z is pushing 320 whp (when adjusted with curb weight) or 348 whp (when non adjusted). I do not have the dyno sheet on me to report the torque but its almost even. They said my car is producing alot of torque for some reason. But where is the whp?

Cars I have seen tuned by MRC in NJ have shown 400 whp with the same mods I have. Is this just a tune or dyno difference which is making my car not show the same. I am interested in seeing if I got another tune (between conservative and aggressive) if I would make more power.

Do you guys think I am good and should stay with what I have or tune at MRC to see the results?

I will be eventually be building my engine and looking at a gt35r or gt37r turbo but thats probably not going to happen this summer.

--Vinny

P.S. I had a typo in the subject, misspelling.

 

Go to a Dynojet and get "standard" numbers. What were your baseline numbers there? If you dont have any you dont have anything to go off of.

If you were planning to build a TN kit was the wrong choice IMO, and you're running an NA exhaust system on a FI car.

 

Do a boost leak test. I only ran 330 on a DD and later found a bolt missing in my intercooler leaking major boost. Just search homemade boost test and that should bring up my DIY on it. Even for a mustang dyno 320 is a bit low.

 

Vinny - when I had my TN Single I actually made more TQ than HP on a DD dyno. IMO it is a function of the tune and weather conditions at the time of tuning 90+* in my case. Don't forget that some shops make a single pass with crazy timing or race fuel just to post a big number and then dial it back to a driveable tune. I know that MRC was one of the few shops that used all the correction factors on their DD before posting results (temp, barometric pressure (I think), elevation). If you are that concerned I would suggest finding a DJ dyno so you have an industry standard number. Best of luck - Cass

 

MRC is no more...kind of out of business for 6 months now...

 

I show 368 whpr from MRC's DD dyno at ~6 psi. Other show ~330 whpr at 6psi on other DD dynos....see what i am getting at? Don't fret, you are probably mroe on target that you think

 

What psi was this at? Forgive me if Im wrong but you never mentioned that.

 

I put down 350whp and 377wtq @7.5psi on a mustang dyno with the TN kit.
Was running Borla Exhaust at the time. TN kits always seem to put out more TQ the HP.

 

all the exhaust is spooling just 1 turbo (that is generally considered "small" these days) so its hitting full boost right around the peak tq of the motor (on stock cams).

Most built motors either are twins, or different cams.....so they are inheritly not hitting full boost till after the tq peak.

tom

 

Sorry about that, I actually did mention it but then when I hit submit the page failed and when I wrote the post over I forgot it.

I have a 7lb spring in the wastegate and the boost holds at 8lbs.

Running 320 whp adjusted @ 8lbs of boost seems shitty to me.

Also, I didn't know MRC was gone

 

Let us know if you need someone to retune it for you.



I have tuned 25-35 TN setups on Zs so i know what they should do. We also hold the TN quarter mile record on stock block running 11.0 at 124.

 

Well 7-8psi on TN sounds about right on that Mustang dyno.. Get a DJ run and youll prob be happier....

 

I am hearing a mustang dyno is a true number, so is my true number 320 whp? If its true then fine, I don't want a bloated number like 400 when my car is really putting down 320. Hmmm...

 

Yep its prob true @ 7-8psi TN....

 

On a stock block, the Tuner told me 9-10 psi is dangerous and I could blow something. Have people run safely at 9 on a stock block? or more than 9?

 

Dont do it..... Be happy with what you got Vinny... Do you have the $$$$$ for a built block and another FI kit?? If not be happy with your 320whp...... Dont chase a #..

 

I watched some of your Vids, your a shift master lol

The reason I am running the Nismo is because I wanted the stock sound but a little more performance. I want to dual exhaust look as well. Do you suggest something better for my setup? Let me know I will seriously check it out.

 

True that, until I get on Twins and build the block, I will just keep what I have 320whp is a big jump from the stock 240whp if you think about it but was it really worth the time and money I put into it, that I am not sure about.

 

I thought Dyno never really car about curb weight? Dyno only measure the power to the wheel so it dont matter if it is 400lbs or 4000lbs.

Anyways, it is all base on the tuner. What is your A/F at full boost? It also matter how much timing you are running on that setup. Post part of your timing map and we'll get an idea if your tune is on the conservative side.

 

don't go to a 3.3 unless you have near 500 hp. at low to mid 300's your car will feel sluggish