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post #1 of 5 Old 10-24-2015, 07:42 AM Thread Starter
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Computer/MAP/Timing

Stupid Question:
How does the cars computer know when to start pulling timing under boost when using a stock 2002 GT computer?

I've logged a few runs recently and the timing is doing goofy things under boost so I'm trying to understand how the computer knows when it sees boost and how much timing to pull. Maybe there is but I don't recall seeing a stock or aftermarket MAP sensor on the car that's tied to the computer.

It's going in for a new tune Wednesday and I want to make sure the car is ready but I keep thinking about the last two logs and I'm wondering if I'm missing something with a MAP sensor.

ks



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post #2 of 5 Old 10-24-2015, 09:01 AM
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On the eec-iv stuff you have a few ways. One is to mess with the load scaling. The stock tune knows about how much air can enter based on engine displacement, but it gets iffy when he starts to see more than 100% VE. Second, spark tables can be rescaled to command significantly less timing above a certain load.

A MAP is the best way to do and I think the only add on MAP is the Anderson PMS.

Boost tuning is not for a 1st timer.


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post #3 of 5 Old 10-24-2015, 09:11 AM
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Didn't even realize this was in the turbo section, turbos are even trickier than a centrifugal supercharger. Boost can be created at such low RPM make having timing and load tables suitable for boost act like a dog in normal driving. I would want to known your tuner has done other turbo EEC-V cars with success before he blows up yours.

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2012 GT/CS 5.0 - Yellow Blaze Tri-Coat metalic, A6, HID.
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post #4 of 5 Old 10-24-2015, 09:41 AM Thread Starter
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OK, thanks for the info. I figured that if there was no MAP present then the tuning had to be done with MAF and load readings, etc. The timing on the last two logs look goofy and don't match making me think a MAP sensor was bad or not plugged in or ?? but there probably isn't one. I'll just be glad when the new tune is done.

The Gent that will be redoing the tune Wednesday is a genius with these so no worries there. The tune that's in the car now is a custom one done by HPP and the car made 720/720 on 93oct @ 18psi but it needs to be all redone since things have changed (new turbos, more boost, new trans, meth inj).

thnx again!
ks


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post #5 of 5 Old 10-24-2015, 03:12 PM
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The new MSD CD box has a MAP sensor. It can data log also.
Think it's the 6AL-2 Programable.

That would be a cheap & easy way??

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