Why I THINK a tune isn't necessary 321WHP
 

Hey guys,

This has been BEATEN to death, yes I know...


Dynojet, highest was 321HP, followed by 319.8, and 318.4...
Tq was 266-268
WITH a CEL (TP related)

Mods:
Stillen G3
Megan Resonated TP's
Stillen CBE

NO TUNE
Mods have been on for thousands of miles though

While these aren't THE highest numbers ever... They're up there, I think people are hell bent on thinking a tune WILL give better numbers...
While I still believe that if you let your car make the adjustments, you'll do just fine
Maybe with the VVEL unlocked you'll gain more... But it is worth it?

Dyno sheet below



Oh and on a 7AT

You are not alone.

http://www.the370z.com/tuning/55417-...-thread-2.html

do you have a baseline to compare against on the same dyno? number don't really mean anything by themselves.

The tune is not just for the highest WHP/WTRQ gained but rather improving the variables under the curve. Also fan control/idle rpm/top speed limiter etc etc. There are other reasons for uprev/tune. The driveability also improved. In the end its your choice.

Those are pretty nice numbers for those three modifications.

Nope, sorry... I never, ever intended to dyno my car...
I think the guy has a dyno sheet from a stock 370 though

I do agree with those,
Playing with fan control and tunes for valets are nice...

But a LOT (dare I say) the majority of people believe a tune is necessary to squeeze the max HP out of the car

My car did also hit the limiter too, lol

So I guess a tune can lift that too (not sure how often you go over 155 though)

Everyday of my life.....Which i live a quarter mile at a time.....

This is a before and after of my custom intake manifold, hence the lower numbers:

http://i1127.photobucket.com/albums/...2119CCEEA9.jpg

Afr?

So maybe my numbers aren't totally unbelievable alot of people seem to think something was wrong with the Dyno I was on. Plus bc I don't have a stock baseline sheet either i was modded before my tune. My sheet just shows the curve before and after uprev but with mods. Similar to yours, intakes, test pipes and cat-back. Then a custom uprev tune. One day ill go back and re Dyno my car bc now I have HFC bc of state inspection screwed me, thought I could get by with out someone checking bc we don't have emissions where I am but they noticed I didn't have cats and failed me. The shop I go to said a retune wasn't really necessary by putting on the HFC since they were only 200cel it may have made the car a tad richer but nothing I needed to pay for a retune for.

^ this is why you tune

So many people are stuck up on dyno numbers. Run your car in the 1/4 mile and that is the true measure of horsepower (your trap speed). My car made 440whp on S&Rs dyno and then only 380whp on Z1s dyno before my retune.

Even if you run on 1 dynojet and then drive 10 miles to another shop that has a dynojet...your numbers can still vary.

low end/mid range torque will improve, as well as throttle response. peak hp is not vastly affected by a tune. happy afr's = happy car

I'm going to explain this a little bit more because I don't think the OP understands the importance of a tune with all those mods. Yea you will creep out a few hp more and have your CEL turned off but the biggest reason is to make all those mods work together with your Z. The Z tends to run on the lean side with all those mods and a tune really cleans it up. A good tuner should be able to show you how messed up your AFR is and how a tune can clean it up.