Most of my mods are in my signature. I am going to get the car re-tuned on Friday, and the only changes that have been made since then are the addition of a cutout and 4.10 gears.

I see some guys here dyno a bolt on only car and get numbers close to mine, some even have higher torque numbers than me!



Note that the tuner even "cheated". The correction factor is STD instead of SAE, and the smoothing is at 0 instead of the usual 5. I will post a SAE/5 version of this dyno later on so everyone can see how low my numbers really are.

On Thunder Racings website, they have a dynosheet of a 98 Trans Am with mostly the same mods (save for that car having an aluminum flywheel) and it made 398 rwhp!

My friends tell me that my car smells like gas at idle and when they drive behind me and I get on it, so I am hoping a new tune, which will be done by Mike Norris will help it some.

Some of the mods I have done that affect my numbers in a negative way are:
1. 2.5" catted Y pipe (but at my power level, does it really affect it that much?)
2. 315's in the back
3. Steel driveshaft
4. 4.10s, but those were not yet installed when that dyno pull was done

But do all these "negative" mods cause my numbers to be that low? On a side note, the car was tuned for the first time when it had only the headers and a LS6 intake. During the tuning session, they also ported the TB, the dyno sheet then looked like this:



You can see the difference in the baseline pull with just headers and LS6 intake compared to the pull done after porting and tuning.

And by the way, the car started out with this pull....with just lid and B&B exhaust:



So am I cursed with my choices in mods or is there hope that a better tune can get my numbers where they should be?

Thanks for any comments and ideas!

Manny

 

That's definately a restriction, it would pickup a nice chunk of hp with that removed.

Maybe 5-10 rwhp? Not that it matters, your car will be faster at the track.

 

I agree that a 3" ORY will wake the car up along with a good tune. I fully believe TR's graph as my car made 399rwhp @ 386rwtq TR224 stock 241 heads with every bolton and LTs ORY and open cutout.

 

Those heads are quite a bit better flowing than mine though, right?

If I assume the 375 rwhp as 365 rwhp using the SAE correction factor, then my car gained only 55 rwhp with the major mods being Cam, Headers, Ported TB, LS6 Intake and tune! That's kinda shitty, isn't it?

 

I think thunder even had an aluminum flywheel

 

Yeah that's what I said, that's the only difference, the flywheel, and a carbon fiber driveshaft..