This is on my buddys car. It is an 02 Trans Am with a 224/224 cam and Pacesetter longtubes. Car is an auto with 4000 stall. He had it dyno tuned and it turned out 380RWHP on motor and only 470RWHP/431lbs torque on a 150 wet shot. He said they tuned it on the rich side because he didn't want any detonation problems (Can't blame him).
Question is-why such a discrepancy? I usually see torque through the roof with nitrous. I figured 515-525RWHP and 550ft-lbs torque. The motor numbers are excellent though. I will find out his A/F numbers tomorrow.

 

Usually the jets are fairly accurate that come with the kit but in your friends case it seems something is off. I have seen some people actually gain more than what they were jetted for but I have also seen people gain right under but not as low as you say. The richness could be a problem. The A/F will be the deciding factor.

 

A stalled auto would also affect the dyno i would think.

 

I realize that about the stalled auto, but the NA numbers are even higher then expected. On the other hand, my buddy with a stalled LT1 (3500 stall) put down 150 on a 150 setup. I really think the A/F may be the key, but how cautious is too cautious? It is his car and I am not paying his bills either. Just sounded like something was off.

Porksoda, how is the old ride? I was in the market for another Trans Am a couple months ago. I decided to go with a 99 GTP instead. I have a second daughter on the way and figured this was the way to go.

 

what was the A/F ratio? how much timing did he pull?

 

A/F and timing, need more info here. i like to see my AFR stay just under 12.0 on the jug.

 

Probably very rich and low timing, and/or, you may have the 100hp jets in there. What are your jet numbers?
Robert

 

I think it's all in the a/f and timing. According to NX, 150shot=150rwhp w/in -1/+1hp.
Someone can chime in to add on or correct me on this.

 

It is my friends car and I was just curious. I know the NX kits have always shown spot on with their jet ratings. I will email and ask him today. Thanks guys.

Also, the converter was supposedly unlocked and they think the nitrous blew through it. It is a nice Yank SS4000 verter though. Only the track this weekend will know.

 

+-1 is a bit extreem for a A4 car, it does have alot to do with converter efficiancy, but thats way off for 150 jets, and the tq is what really tells its not doing what it should, what style setup he have, is it all NX stuff? i pieced together a kit, with noids that would support over 400shot and jetted for a 175flywheel, 152rwhp shot and it only produced 110 average hp 105peak and 120 max in the curve because it maxed out the old school nozzle i had. no matter what size jets it wouldnt flow any more. but it did produce 147 ft lbs of tq tho.

 

wet shots are rated at the wheels and dry shots are rated at the flywheel....

those torque numbers seem to be off by quite a bit. I was figuring high 400's or low 500's.

 

He did say he has a conservative tune also. I bet it will still run good times.

Soon as we get a nice day and I finish my nitrous install I'll have you wire my system up Sean.

 

Hey, this is Chris (sold you the salad shooters). Sean is 1sickta, kinda took it off me.
I really think Joe and Sean are messing with us on this. I have never seen a LS1 car produce less torque then RWHP. I really figured he would put out low 500's RWHP and 525-550ft-lbs of torque.
He said the A/F was between 12-14 and they upped the called for fuel jets of 34 to 36 and removed 4 degrees of timing for the nitrous pull. Motor run actually picked up with the timing removed too. I guess the only thing that matters are the track numbers. I will post them Sunday night.

 

nx runs there kits overrich anyway so do not over richen the kit it will be better and make more power just leaving the kit alone. leave the jets alone trust me you will be better off and be happier.

 

If it were mine, I'd go by the recommended specs too. This is his weekend cruiser and he in no way wants to blow the motor up over a fuel issue. I have to respect that, because it is damn expensive to tear into one of these. I was dumbfounded by the odd torque numbers and trying to find an answer.

 

Here's a quote from HSW's website about their dual nozzle dry kit:

 

yeah it has nothing to do with wet or dry on the hp rating, it depends on what brand kit you have.

 

Do you know the LSA on the cam? Since the car dynoed so well on motor its probly a good all motor cam. But with the low torque numbers it probly has something to do with the A/F ratio, also it could be blowing thru the stall converter. I would lean it out some. With that setup you will probably notice more of a gain at the track than on the dyno.

 

What was the bottle pressure?

 

My current 408 produces 430rwhp and 450rwtq n/a.
Robert