PONTIAC SLP

iTrader: (3)

Hi , Who can read these graphs and tell me the issues

My questions above the Graphs

NOTE : Two different tuners tuned the car , Last two Graphs the other tuner

*Is this correct Air Fuel ?
*I don't see any problems with this graph and the curve is good



*Is this correct Air Fuel ?
*Why the curve is going down ?


*Is this correct Air Fuel ?
*Here too Why the curve is going down ?


I talked with my builder and he said sounds like some lifters are bleeding down , I installed new Morel LSX link bar lifters and he said install the short travel lifters , Tuner said bad springs but i'm sure not the springs because all those runs was with same springs

I know the Air Fuel should be on 12 but it shows 13 on the first Graph

What you guys think , I waste alot of money for Dynos , mechanics and replacing parts and still dunno what's this problem , Dunno where to start

Thanks in advance

same o'j

my Advice to you Xperformance Dyno
go to Faisal Dashti i think he's the best tuner in Kuwait & middle east
thanks

bene

iTrader: (16)

The 1st is tuned to make the most power and too lean IMO by looking at the graph, looks like 13.5 AFR by the end of that run.

The second one is a little rich for my taste but it isn't bad by any means.

Third is too rich.

Cold Zero

iTrader: (1)

I'm not expert on this but it will not be out of these two reasons ( Clutch Slipping / Valvetrain Problem )


+1 for XPerformance ( Faisal Dashti )

Nitroused383

iTrader: (10)

You need to post a graph with torque reading and rpm increments. The AFR is not the issue, even going from 12 AFR to 13.5 will not make a difference of 60 hp. How much rpm is 130 mph? Power always drops after peak... I tune peak torque to 12.5 afr and after that I taper up to 12.8 afr by peak hp for a naturally aspirated engine.

PONTIAC SLP

iTrader: (3)

130MPH is 5.800RPM-6.000RPM , After it drops , I know if it didn't dropped motor will increase around 50RWHP , But i want to know why the curve going down after 5.800-6.000 RPM ?

PONTIAC SLP

iTrader: (3)

any one can help ? i'm confused dunno where to start if the problem from pushrods , lifters or any thing from the valve train

RAMPANT

iTrader: (17)

Firstly, what do you have?

Cubic inches, heads, cam, forced induction. Different things make power in different rpms. Peaking at 5800-6000 is not that abnormal. These will help people possibly see what is happening.

Also if it is NA vs FI will make a big difference where you want the AFR.

I may have missed that, but I could not find it even on your Facebook links.

PONTIAC SLP

iTrader: (3)

Thanks for ur replay
My setup is LSX 454 , CR 12:01 , LS7 Mast 305 heads , 661\661 112 , Springs up to 680lift , morel lifters , crower LS7 adjustable rockers , LS7 fast ported 105mm intake and 105 T\B , All was N\A runs , First graph was before I rebuild the engine because was smoking from breather and I changed with new morel link bar lifters and this happens , My builder said install comp short travel lifter

RAMPANT

iTrader: (17)

I can tell you my 455 with 94 octane and 11.2:1 it seemed to like 12.8-12.9 AFR. When it went rich 12.4, it appeared it was loosing 20-30hp and when it went 13.05 it appeared to lose about 10-15hp. I have a smaller cam and heads than you but did not peak much higher than you are, it was at 6150 rpm.

Seeing your rpm and torque would help a lot.

If your tuner can send you the actual run file ( .drf), you can send it to me by email and I can change the parameters so we can see what it is actually happening. I have Winpep on two of my computers at home.
I will send you a PM with my email.

XPerformance

camshaft could do this also, have you degreed the cam ? is it installed on the correct Intake Lobe Centerline specs ?

from the graph it doesnt seem you have a valve float issue.

PONTIAC SLP

iTrader: (3)

Sorry for delay , Yup the cam installed correctly , I throught it's valve float issue or springs running bad ! , We checked the springs with the springs tool and the pressure was good not weak , I also heared the adjustable rockers may fall at the high RPM if they weren't adjusted correctly but we adjusted the rockers many times and the same ?