Lawazita93

Hey guys i dont know if its the right place to post but ive been having issues with my car on a dyno and im going nuts out here i would appreciate opinions and comments and ideas.


06 gto ls2

stock bottom end

ls3 prc milled and ported heads

gpi ls3 intake

staiess works 1 3/4 headers

svede intake

e85 injectors

walbro450

runs on e85

3in pipe

pat g custom spec cam 23x-25x .629 .615 lift

circle d 3800

spool

3.91 gears

1 piece drive shaft

built tranny 4l65e

ac delete

ps delete

weight reduction

mezzier electric water pump

slicks and front runners

well the car is a beast on the street runs good at the track

fastest at the track has been a 10.9 at 126 mph yet when i go put the car on the dyno its only making 376 hp to the wheels how is this possible, ive taken the car to 2 different dynos in the area and the both give me pretty much same results ive tried different tuners and both of them have told me that the car feels like something wont let the car open up the whole way takes a while to reach the powerband and yes in the videos you can hear the car, sounds kind of weird when it trues to open up like is something was just not letting it turn up do you guys think it can be me torque converter maybe its to tight? What do you all think, ive about done everything to the car except change torque converter

G Atsma

Is that a single 3" exhaust? If so, there is your problem.

Lawazita93

No its its double with x pipe

Dren

I had a 496 stroker, 650 horse build that only put down 350hp on a dyno. But the car was a beast and would outrun >95 % of cars on the street. A dyno sheet is just brag rights but a 10.9 at 126 is way more brag rights. They said I had a loose converter. Sure it hurts but let a track grudge match do the talking..

Lawazita93

Thanks man ill keep that in mind ive done everything i can think of and had shops look into it i guess it just dosent like dynos its a beasst on the street though

13qtr

are you dynoing with the convertor locked or unlocked? A unlocked convertor will read low. My 'vertor can be locked at wide open... To show the difference, I dynoed with it locked and unlocked, back to back. Locked went 521/499. Unlocked went 487/436. A difference of 34whp and 63wtq

Lawazita93

Yeah its getting locked, i raced a 880hp turbo truck a while ago he runs 9.9 at the track has been his fastest i stayed about a truck length behind him so i mean i cant explain the numbers on dynos if the car acts diffrent on the street or track i guess it just dosent like to be on them

30th t/a

iTrader: (51)

what's the race weight?

Lawazita93

Havnt weighed the car but a wild guess it be at about 3600

13qtr

If your asking me.... Mine weighs in around 3900

rkupon1

iTrader: (3)

Have you guys been datalogging with it running good on the streets? Comparing em to logs on the dyno? I m aware they should be different, but looking for big inconsistencies

IIRC, typical H/C/I gto s are 450ish whp.

13qtr

I datalog all the time...what kind of differences? I wouldn't think they'd be much difference between the two. The tune doesn't know your on a dyno, it will spin up alittle quicker on a dyno. BTW...mine dynoed 441/412 all motor on the dyno, locked convertor..

T.Man

You have some items that aren't exactly dyno number friendly. Especially if you're dynoing with slicks. That aside, who cares what it dynos if it's running 10.90's at 125+

circle d 3800

spool

3.91 gears

built tranny 4l65e

slicks and front runners

Jtm2085

iTrader: (1)

How exactly do the front runners effect dyno numbers 🤷dum♂️. I just had to say it lol

LilJayV10

iTrader: (39)

Internet....my 370whp car runs 10's......

Something is wrong. Why am I not making 500 to the tires? I want to make 500rwhp but if it's ok if it runs 12's

Somethings wrong.

******* ****.

T.Man

Your reading comprehension is lacking. I copied and pasted his list. Try rereading my post.

I swear to Christ. Between the OP and ********* like you, the internet and forums as a whole are turning into a **** fest of idiocy.

T.Man

Right? For ***** sake.

LilJayV10

iTrader: (39)

here i condensed that for you.

www.ls1tech.com

Chris25

iTrader: (1)

Nice times OP car sounds about right for the mods. How'd you like the switch to e85?