Hello Everyone,

I've Finished putting my engine together

6.0 Iron Block with eagle balanced Rotating assembly
11.8:1 cr
GMPP LS3 CNC Heads with lunati Dual springs
Yella Terra Rockers 1.7
Comp cam 247/255 624/624 114 LSA
Edelbrock Victor Jr. Intake Manifold
6061 elbow with 102 mm fast TB
Ford racing 39lbs inj
Hooker 1 7/8 headers

well... I put the car on loaded dyne jet and i got these numbers: 491 HP and 435 TQ STD

AF 13:1 and on 93 octane

Its Daily use car with M6, strange S60 and 4.10

my Question is I feel the numbers are low (I could be Wrong) but what shall i do to get in 500 range ?

 

Get it to the track and see how it runs

Don't get caught up on dyno numbers, They're just that.....Numbers

 

60 ft 2.051
330 ft 5.638
660 ft 7.96
mph 89.206

 

Thats what it ran with the 408 thats in it now??

 

yea

 

Strange....that's what a bolt on LS1 runs.
I am going to be watching this as I am building a LS3 headed 408 now https://ls1tech.com/forums/generatio...-breather.html
Something's not right.....I would have guessed that combo @ 525/500 or MORE

 

i know .... my car before that with 224 cam only was doing better than this

its like throwing your money out of the window

please i need help with this

 

Well what tire were you on? where you shifting? needs more gear

 

Im running MT Radials 275/40/17 and launching with msd 2-step at 4000 RPM
and shift at 6900

 

Somethings deff wrong. Kind of hard to tell being on the other side of the computer though

 

yup trust me i wanna know whats going on i tried to scan it , took it to a couple of shops to look at and no one were able to help. so i took the engine out, took it a part, checked everything and put it back and same thing . LoL but I swear its like the car is not happy at all.

It runs great even with AC on but i wish i can fix the power issue

 

I mean the Dyno numbers don't seem THAT far off but the dyno and track numbers are no where close......Slipping clutch? Undergeared and just no where near your power band?

 

Clutch ok and transmission too, u can feel the car is not pulling at wot and part throttle

 

Maybe with the weight of the car loading vs dyno is making it break up? Check TPS voltage to make sure it matches up only thing I can see if it makes the numbers on the dyno but doesn't perform at the track is its acting up when its under a real load

 

Lol i did that and i checked throttle open percentage and all good

But i will redo it and check

 

Throw some new plugs in there, Check all your grounds, Check to see if the TB itself is opening all the way, Check for Exhaust leaks, Vaccum leaks, compression test, Checking valve train lol it goes on and on

 

Here is my dyno sheet

 

I did all kind of mechanical test yesterday and all fine. So i guess its time to go over electrical

 

That'd be my guess and looks like you need to spin that thing a LOT harder....

 

He says he's shifting @ 6900. I can't read the rpm range on the dyno sheet..
OP do you have a dyno sheet with rpm (those are cut off and look like possibly mph, at least on my screen).