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View Full Version : anyone elseported maf ends and pe vs rpm


AMRCNBA
03-17-2004, 05:21 PM
If got ported maf housing, and I've just about got the ltft's under control. I've got the entire maf table multiplied by 120 percent and that seems to have done it. The maf table is also maxed out at this point, 511 is the higest value it will take, at 11250hz.

Now, I've tried everything I can to get the wot tuning done and nothing i do seems to want to get rid of the knock retard. The best luck I've had is actually multpling the entire table by 90% which is actually backward from what I shold have done. But it helped.

Should I change the max enrichment allowed to a higher number or does this just effect partial throttle?

What is the max that you guys have seen the pe table multipied by? Was it a smooth line, it it grow like the maf table, was it a straight line, looking for any help that I get here. I've multiplied by 110 but id didn't act any diffrent.

I was told to take the MAF ends off, but they are working fine and the trims have finally started to act like they need to.

Anyone in the DFW area want to lend a hand? I've time during the week to meet someone. Will trade labor for tuning help, or will buy dinner whatever. I'm in Arlington.

Email or call Chris

817-861-0904
amrcnba@yahoo.com

JandJsTA
03-17-2004, 06:29 PM
The only thing I can suggest is dump the MAF ends or any mods to the MAF unless your are running over 500 hp and have maxed out the stock ones capacity. I've seen more tuning headaches/nightmares then I have good stories with MAF ends/ aftermarket MAFS ... just a biatch to tune with for what you may get in gains IMHO .... especially lean conditions as with your case :(

jimmyblue
03-18-2004, 03:05 PM
I don't know how timing table works w/ MAF (whether
frequency or gm/sec or ???) but the lowered MAF output
frequency per airflow may just be indexing more spark
than the engine can tolerate. 30 degrees seems to be
about it, at the top end. I would look at the actual advance
at RPM, and if you have KR at a give point then subtract the
KR amount from what's in the table. Table - KR = actual at
WOT.