Powerdroping on a LSA at 5800 rpm.

[Javier Wilde]

First of all merry Christmas to every one...
Well, im having this issue that no matter what i do, power drops at 5800 rpm, same point that maf pid gets at max 655 g/s(not sure if related).
I cant see throttle closing, almoust no knk but it drops baddly. AR headers and dual 3 inch straight pipe so enough for 608 whp i am making.

Attached files.

Thanks.

[Lakegoat]

Why do you think power is falling off? For some reason, I don't see your wideband? Looks like your speed increase is pretty linear.

[Javier Wilde]

Why do you think power is falling off? For some reason, I don't see your wideband? Looks like your speed increase is pretty linear.

Look at graph over 5800 rpm...is there any other torque table that must maxout?

[Gpargament]

I agree with javier looking at your log and the logged parameters I dont see the Wideband. However looking at the image and following the AFR vs the HP and Torque, as soon as it starts to lean out the power and torque follow along accordingly. I believe the standard for maximizing HP is to lean it out at the end, however I have seen a lot of cars retain better torque(which leads to increased HP) through the last 300-400 rpms by maintaining a steady AFR or even going a little richer. I dont know how easily accessed your dyno/tuner is but it could be worth taking a look at.

[lukearmstrong1990]

is it not the trans getting ready to upshift? your file asks for WOT upshift at 6000rpm.

also why does your log show 15* catalyst heating retard and your high octant table is miles above what you're logging?

[RickClarke23]

what cooling mods do you have because on the log your blower temps are getting high enough to hurt power output greatly

[sgod1100]

i can't see what your actual AFR is, but am i seeing the commanded AFR correctly? According to the log, above 6k rpm you are commanding 10.5:1? And it only gets richer from there, it even dips into the 9s. What i don't understand is your PE eq ratio is shown to be 13.18:1 in the upper rpms

[Javier Wilde]

Afr is 11.0 - 11.3 at the top...its not an afr or ignition issue. At the begining i thought it was a airflow restriction issue, but now i have 1 7/8 long headers and dual 3 inch pipes...stock TB thou. I will check into the transmission side.
Thanks

[Javier Wilde]

Cot is disable.

[Javier Wilde]

True...we have an issue there that we are trying to fix. Im sprying meth, but not working well.

[mecanicman]

Looks a lot like this, in this case its belt slip.Attachment 85794

[sgod1100]

Afr is 11.0 - 11.3 at the top...its not an afr or ignition issue. At the begining i thought it was a airflow restriction issue, but now i have 1 7/8 long headers and dual 3 inch pipes...stock TB thou. I will check into the transmission side.
Thanks

So, your actual fueling is 11.0-11.3, but you are commanding something else. Seems to me like your Maf curve is off (i.e. P.E. raping)

[justhereforinfo]

Which valve springs are you using? Which cam?

[Javier Wilde]

Stock...