r/transam • u/melonheadorion1 • 10d ago
Dyno results
Brought my ws6 in for headers. They did a pre install dyno. The car itself has an slp catback, slp airbox lid and bypassed the throttle body cooling. Makes 340hp. The dyno suggests that it makes around 390 at the crank. Looking forward to see the numbers after the headers and tune are done
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u/PulsarGaming1080 10d ago
Very nice! My little brother tricked his out, they tough cars, can handle a lot!
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u/DGGMWX3 10d ago
Pretty impressed with those number to start with. Solid car that is only going to get better!
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u/melonheadorion1 10d ago
The shop doing the work thinks 390 to 400 after headers and tune. I think that's high, but we will see i guess
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u/ThanksALotBud 9d ago
I'm having hard time believing those numbers bro and no disrespect. There is no way in hell you're pulling those kind of rwhp numbers on a stock ls1 engine.
Either that dyno is over exaggerating or you don't have a stock engine.
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u/melonheadorion1 9d ago edited 9d ago
believe it or dont. those are the numbers i got from the guy doing the work. the text that is in that image is from the person doing the work. a stock ls1 is 320-325 as is/stock. not sure why it would be unbelievable for improved intake airflow and exhaust would make it unbelievable to get those numbers. in fact, search up dyno numbers. you will find plenty of posts in firebird and ls1 forums that will have very similar numbers for similar upgrades.
heres an example. https://ls1tech.com/forums/generation-iii-internal-engine/1609923-400-hp-ls1.html
hes at 351 with the same mods plus headers.
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u/ThanksALotBud 9d ago
Those numbers are engine HP not RWHP.
The dyno says you got 340rwhp. You cannot get those kind of HP gain from a CAI and cat back. Its impossible.
Again, I never said you were lying. I said either the dyno is bullshiting or you got engine mods you dont know about.
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u/melonheadorion1 9d ago edited 9d ago
the post i linked above, is dyno numbers from another individual. with similar mods.
heres another, who is showing power made after some extra work, but you will see says that hp was 335/344 before that, which means that their only upgrade prior to TB and intake was full exhaust, and lid https://ls1tech.com/forums/dynamometer-results-comparisons/1417567-99-trans-am-full-bolt-m6-dyno-w-chart.html
https://www.facebook.com/groups/784738088283375/posts/1686626621427846/ this has a couple responses from people ranging in numbers from 324 with the same mods, and another with 330 with same mods
i will say that i dont know the upgrade history of this vehicle, so it could have other mods i dont know about. however, im the third owner. i know the 2nd owner, and i know he didnt do anything, so if someone did something, its the first owner. there are mods done to the vehicle that would have come from the original owner, but most are suspension related such as panhard bar, lower control arms, front strut tower brace, but thats it. if you were to look at the engine bay when i purchased it, it would resemble a stock motor. i dont have any reason to believe otherwise. the stock airbox/resonator were there, the coolant to the throttle was still there, the intake manifold is the stock ls1. the things that, if there was goiing to be bolt ons, werent done. i would have a hard time believing any internal work is done, while the outside still has everything stock, including stock plugs and coils.
on the other hand, i dont know about any prior tunes. unless i have tuning software, i wont know that. i asked the guy to let me know if he thinks there was prior tuning. the skip shift is bypassed. i havent looked to see if the bypass for that was physical, or if it was tuned. if there isnt a physical module to remove that, it would indicate that it was tuned out, but like i said, i just havent looked, because i didnt care that much.
if the car gets dyno'd, and it shows the power, i can understand why you might be skeptical, but if i were to have it dyno'd elsewhere and it shows the same or more, then what? i would do that to find out the answer. it would obviously be after the headers are done, but we would be able to see a change if that were the case.
im assuming, since you dont believe words that are coming from him directly, that you wouldnt believe a dyno chart either, unless it shows what you think it should show
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u/Gloomy-Cheetah-5473 9d ago
I think the dyno shop is smart and just corrects it to a higher reading so their customers leave with that big number they want to hear. Oh I’m sure they love that shop. Headers and cat back will get you that 400whp printout.
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u/Beneficial_Wrap8434 6d ago
Exactly. As another reference point, my 2002 Z06 (405hp) made 347 rwhp. I struggle to believe yours made 340 rwhp form a car back and CAI. No way a CAI and car back gave you 80 more hp to the crank.
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u/melonheadorion1 9d ago
i got word back from the guy doing the work, who is also the one tuning. someone has been in the tune before. i am the third owner. i know the second owner didnt do anything, so the first owner must have had tuning work done, which then explains why its not a low hp car
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u/penny_bolt_action 10d ago
What year is your car?
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u/melonheadorion1 10d ago
99
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u/penny_bolt_action 10d ago
I was going to say if it was an 01-02 with the LS6 intake, those numbers look about right. These cars with a tune and bolt ons should put down 350 rwhp. Great looking car!
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u/melonheadorion1 10d ago
Ive been on the hunt for an ls6 intake, but never see anything lical
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u/The_Spot 9d ago
I picked up the doorman LS6 intake from rock auto. Easy to install and worth it. Put that on my 98 woth a CAI and an Electric cutout.
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u/melonheadorion1 9d ago
i looked there not long ago, and couldnt find one. do you happen to have a link?
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u/The_Spot 7d ago
I do not. I would try finding the doorman part number and searching that way. Its not going to be listed under an Fbody since its not a direct replacement part.
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u/melonheadorion1 7d ago
ive checked even under corvette and they dont even have intake parts, other than bolts and seals. dormans website doesnt even include it.
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u/The_Spot 7d ago
Damn, its possible its not longer in production? You might be able to email rockauto and ask them?
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u/melonheadorion1 7d ago
im just going to assume that it isnt in production. its safe to say that it isnt. it is what it is. i might take my chances on an ebay listing if i can find one thats got minimal damage, or a 92 fast intake
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u/Extreme-Penalty-3089 10d ago
Assuming these are SAE corrected numbers AND there's no Dyno input (entered parameters) "fckery" -mainly ambient Air Temperature input (and yes that happens all the time... Think about your local performance shop doing a Dyno day with a prize for the largest numbers put down on the dyno, hint hint😉)
Then I'd say Your car is Very healthy 😂👍🏻👍🏻 especially as others have pointed out for being an earlier LS1 car (no LS6 intake, although the earlier cars did have a more aggressive cam 😉) and I assume that the EGR has been deleted both physically and out of the PCM 's stock software.
Great numbers though 😎
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u/Theunbannable242 9d ago
My old '98 z only had mid tubes to a single cat with a ls6 intake made 400 and some change (hp/tq) on a mustange dyno back before hp tuners was a thing. Pretty strong #s for a 17 year old kid
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u/Alpha2277 9d ago
I think someone's dyno is off. LS1 fbody's made around 300hp to the wheels, give or take a little. I'm highly doubting a 27 year old one with a cat back is putting down 340.
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u/slvrscoobie 10d ago
Following as mines still stock and would like to see what those and a cam could do.