AEM Ultimate Resource Thread>>>>

[Import Power]

I am running stock TT heads, with street grind cams. Wondering if stock heads don't like the cams.

[mjannusch]

I was under the impression that upgraded valve springs were mandatory for any cam upgrade.

[Import Power]

Originally Posted by mjannusch

I was under the impression that upgraded valve springs were mandatory for any cam upgrade.

Yeah, what I meant by stock TT heads, is they are stock valves, and 100% stock valve seats and ports. No work has been done to them. I just cleaned the seats up using valve lapping compound.

I do have 3rd gen lifters and 3SX hi rev spring kit.

I am thinking maybe the stock heads don't like the street cams. But not sure this early in the game.

[mjannusch]

I've got DR's street cams in my Spyder and don't get that much noise on top.

I was thinking that if you still had stock springs maybe they weren't strong enough to keep the rocker against the cam lobes and were floating a bit which may cause noise. Since you've got upgraded springs that shouldn't be the case.

Over the years I kind of wondered if the 3rd gen lifters with the larger top hole might bleed down easier than the earlier lifters, but I have no data that would support that idea.

[Import Power]

The top end was noisy from the first startup. Like lots of bad lifters. And it didn't go away when warm or after lots of run time.

I got the 3rd gen lifters from a parts car I parted out.

I pulled the valve covers yesterday and noticed lots of the rockers were loose.

Pulled the lifters and found they were the SHORT ones and a few would not fully prime, compressable by hand.

Replaced with new set of 3SX 3rd gen lifters I primed in oil.

Started up and was quiet as a mouse. Finally. I thought something was broke from day one. Now she is smooth.

Did a boost leak check.
Found my Old used up turboXS BOV typeH was leaking like a pasta strainer.
Replaced it.
Found the TB shaft was leaking so bad at 10psi I could feel the air rushing out. Rebuilt it. The old seals crumbled during the rebuild.
Now she holds pressure.

Getting some rough tuning done on her.

20-22psi so far, lots left in a pair of 5027s.
Not to sure about the street cams in stock heads yet. Not doing too bad so far and on the street it's the most entertaining street 3S I have driven. Fun stuff. Drove maTT around in it, made him giggle like a girl.

Power drops off up top due to the boost spike at the start of the run then it really settles down about 2-4psi. Using Profecb SpecII. So far no knock on these runs. So a little more timing can be thrown in it.

[BMFRU2]

OK Here's the sticks;

Off of AEM firmware v1.19

Fuel Map parameters

Eng Spd 0 rpm
Eng Load 5.39 KPa RED
Throttle 1.50 to 1.62%
O2#1 3.74 AFR RED
O2#2 3.77 AFR RED
Fuel Map 12000 uS
Fuel Inj #01 Pulse 22.485 to 22.505 uS
#02 Same
to #06 Same
Inj Duty 0.06%

Ign Map

O2#1 3.74 AFR Red
Ign Timing 10.07%
Ign Map 10.07%
Knock #1 0
Knock#1 Volts 0
Knock#2 0
knock #2 0volts

Crank Inj Timing

idle position 99.61% RED
Stat Sync'd off
Spark Start 0%

Raw 160 drop to O5
Throttle 84% drop tp 90%

Idle %

idle Learning Value 0%
Idle target 3250 RPM
Idle Position 99.61% RED
Idle base 99.61% RED

I've wired a MAF-t to the Air intake and to the existing wire harness. Going to see if I can "Dial in" a air Map

Any help on either AEM or MAF-T would be much appreaciated.

[Import Power]

posted in your other thread

Change your afr units to Gasoline, looks like it is something else.

Is the stat sync off while you were cranking the car over? If so that is why it won't start. It needs to be ON when cranking. When it sees the CAS, or cam/crank sensors signal it will turn from off to on.

[BMFRU2]

Originally Posted by Import Power

posted in your other thread

Change your afr units to Gasoline, looks like it is something else.

Is the stat sync off while you were cranking the car over? If so that is why it won't start. It needs to be ON when cranking. When it sees the CAS, or cam/crank sensors signal it will turn from off to on.

Thanks. I don't know what a "Stat Sync" is, but I do know that the CAS is new and installed correctly. Let me find out what it is, and I'll get back to the other post. BTW the AEM unit seems OK.

[Import Power]

Originally Posted by BMFRU2

Thanks. I don't know what a "Stat Sync" is, but I do know that the CAS is new and installed correctly. Let me find out what it is, and I'll get back to the other post. BTW the AEM unit seems OK.

Stat sync is listed in the info you posted. Notice it says OFF. The car won't start if it stays OFF. Once it sees teh engine cranking it will go from OFF to ON. So if the car is cranking and it still says OFF you need to look at the wiring or maybe the CAS itself.

What is your start RPM set at?

[Rogue_Ant]

For you guys running low 20's for boost, what does your timing curve look like? I'm looking for timing when boost first peaks, and your max timing.


-Rogue