So a customer drops his car off for an AEM tune
Another shop had "tuned" it but it was running very poorly and could not get over 16psi with out breaking up and just over all running bad. Bad idle that is high, then low, then surges up and down, etc etc.
I will spend some time on it later, building a new map from scratch of course, I never trust another shops map and won't build off of it cause you never know what small detail you will miss on one of the buried graphs etc. But like looking into what was "tuned" at this point and why it may be running poorly.
But here is what I found in 5 minutes looking at it.
Forged rods and pistons
JDPC TD05 kit
AEM Meth kit
I like to shoot for pump gas (on TD05) 20 degrees at redline at 20psi. It's a good benchmark to kinda aim for.
This AEM was setup with 9 degrees at 20psi at redline. Wow, that's low.
Then I thought, Let me check the base timing. This needs to be set before anything else to ensure when the AEM puts out 15 degrees, the engine will actually be at 15 degrees.
Sure enough, when the car is at idle and the AEM is putting out 15 degrees, the actual mechanical timing on the car is.......5
So at 20psi at redline the car is somewhere around 0 to -1 degrees.
Knock control is set maxed out at 1.4 volts. Very conservative.
Oh wait, if it were turned on. Yep, it's unchecked, it's off.
Looked around for a few more minutes and found some other funny things. Can't wait to dig in and tune her up!
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91VR4-3.0L-Stock heads and Cams-835AWHP 747AWTQ Daily Driver 10.31@142mph on street tires
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