Are these numbers really low??????

[rcorte3001]

1998 fIREBIRD fORMULA A4 47,000 miles

mods:

slp lid
K&N filter
Mac Mids headers
ORY pipe 3"
Cutout
Tsp 228r 110lsa cam
Yank ss3600 stall
3:73 gear
LS6 intake
meling oil pump
ls2 Timing chain
comp springs/pushrods
Aluiminum Driveshaft
Dyno tune


car on dynojet made 360RWH 355TRQ

also the tuner said that the PCM on the 98 ls1 didnt allow as many changes as the new ones and couldnt get the stal to lock up on the dyno....so he said its reading about 20hp less?????

ill have dyno sheets up tommorow
but i was def expecting more like 370-380

[FMR_TransAm]

that low vs my.
I Have a 01 Trans Am A4

I have a 228R Cam 112 Lisa
LT Headers
Y Pipe
Cutout
Flowmaster Super 10 Catback
SLP Intake
SLP Ram Air

Before the Tune
358rwhp 371rwtq

After The Tune

373rwhp 386rwtq

[Spikito]

it seems a LITTLE low, but keep in mind that many of your mods are support mods, they dont add power.

Stall
gears
oil pump
timing chains
springs
pushrods
driveshaft.

all those dont add power.

you start off with 325 on the motor stock, your intake and your exhaust will get you up closer to 375 on motor, which is roughly 320 to wheels, granted a 15% power loss though the auto trans. add your cam and tune, thats good for 40-50hp, putting you at 420 on motor, which gives us 357 to the wheels


where you are lacking most, is in the tune, if what your guy says is correct. a cammed LS1 is all about the tune. You also have more power to gain from the exhaust, put on a set of LTs and you'll hit your 370 mark, maybe the 380 easy enough.

[FMR_TransAm]

Yea, Long Tube Headers with a Cammed, Intake, and Tune Combo are gains around 20 - 25rwhp. changing ur headers to LT Headers you might get 5 - 15 more hp with a good tune. I use HP Tuners

[rcorte3001]

Yeah i know im def losing alot at the headers also heard that 98 ls1 always tune low too? and he also said that he coulnt get the stall to unlock up?

[FMR_TransAm]

i have a Yank 2800 Sleath so, i dont know why ur is doing that.

[FMR_TransAm]

but looking at the dyno before and after the tune. you should see gains from 10 - 25rwhp from what u have. i got around 18hp and 14tq. if the dyno before and after are almost the same then its ur tuner

[rcorte3001]

he said the 98 computers didnt have the perameters that allowed him to go in and unlock the stall

[FMR_TransAm]

? i wont know, but that cause im a 01, but i thought 97 - 02 F-Body where the same. but i dont know about that

[rcorte3001]

supposly the 98 pcm was diffrent from the rest

[Spikito]

the stall only lets you hold higher RPMS to launch off the line with....no HP difference

[rcorte3001]

Hey i know that but i was just wondering cause after looking online on the dyno jet most cars make 370+ with just about the same mods... the only thing i was wondering was is that the reason it produced those smaller numbers? im not to worried about dyno numbers cause they dont mean much but is it true that with a locked up conceerter the dyno racks up 15-20 more hp on the numbers?

even though its not actual hp gains its just braging right numbers added to that actual power?

i was are that with the converter unlocked on the dyno thats the actual power to the wheeels on the street real numbers but when they tune it with the locked up converter it adds those extra 15-20hp (fake) added power? cause that would explain the diffrence in the dyno sheets between others

the stall only lets you hold higher RPMS to launch off the line with....no HP difference

[SMWS6TA]

he said the 98 computers didnt have the perameters that allowed him to go in and unlock the stall

supposly the 98 pcm was diffrent from the rest

This is how it was explained to me on how our PCM's are for the LS1

97-98's share the same (think of it as a Pentium processor for computers)

99-00's have an updated on over the above (think of it as a Pentium 2 processor for computers)

01-02's are updated above all (think of it as a Pentium 3 processor for computers)


I think that your tuner doesn't have is the software to fully interact with the 97/98 PCM's. They are fairly older then the others and most tuners only keep what is current. I check into what it would cost for me to get a full dyno tune when I eventually get cam/heads done and the 3 shops in my area all told me that they would have to find the software for my 98 in order to tune it properly.

[jiveass]

the stall only lets you hold higher RPMS to launch off the line with....no HP difference

a few years ago, a friend of mine put a tci stall in his vette....he was full bolt ons....put down less than 300 at the wheels....tuner told him the stall was bullshit....i laughed when he told me about it...then he put a circle d stall in and got 380ish ....now i dunno if the tune screwed, or if the dyno or what, but thats a situation that did happen..

[cpop98ws6]

My tuner didn't have any problems tuning my car with the 98 PCM. He was able to lock and unlock the converter whenever he wanted. I'm guessing your tuner just need to get the software for the 97-98 PCMs.

[Firebirdjones]

Hey i know that but i was just wondering cause after looking online on the dyno jet most cars make 370+ with just about the same mods... the only thing i was wondering was is that the reason it produced those smaller numbers? im not to worried about dyno numbers cause they dont mean much but is it true that with a locked up conceerter the dyno racks up 15-20 more hp on the numbers?

even though its not actual hp gains its just braging right numbers added to that actual power?

i was are that with the converter unlocked on the dyno thats the actual power to the wheeels on the street real numbers but when they tune it with the locked up converter it adds those extra 15-20hp (fake) added power? cause that would explain the diffrence in the dyno sheets between others

Yes, locking up the converter during the dyno run will increase the rear wheel numbers because you are eliminating the slippage from the converter. Depending on how loose the converter is to begin with will determine how much of a gain there will be.
Because of these differences (among others) it's nearly impossible to compare dyno numbers with other cars. Your tuner either may not have the software to lock the converter, or it's also possible he felt the converter clutch wasn't capable of holding. Some converter clutches are not made stout enough to lock under power (at least not for long ) Depends on what you have, but it's hard on it either way.

I'd just be happy with the number so long as your tune is good, and take it to the track and put a number up there, that's the one that counts

[cowstandmoto]

That seems a little low to me.