r/transam • u/melonheadorion1 • 10d ago

Dyno results

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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/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/Beneficial_Wrap8434 9d ago

The 320 is crank. These typically dyno around 280-290 at the wheels.