Hello Gents -
THE ENGINE -
I've got a gen III 5.7liter 2002 Formula 5.7/T56/ECU transplant into a 99 E36 M3 with H/C/I/Headers.
TFS GenX515 HC Pkg: sloppy stg 2 cam, TFS 215 Heads.
Camshaft specs are 228/230 duration, .585 in./.585 in. lift, 112 lobe separation angle
Cylinder Head, GenX? 215, CNC Competition Ported, Assembled, 64cc CNC Chambers, Ti Retainers, GM LS1, Each
Texas Speed 1.72 RR's
1-3/4" LT Headers
GTP 36# Injectors
GEN III ECU - tuned with Hp tuners.
C5 Corvette Airbridge with AF in front air dam.
Dual 3" Exhaust: LT's, 3" Cat's, 3" X pipe, 3" Super turbo Muffs.
DYNO -
Car put down 417rwhp and 380rwtq.
PROBLEM -
Car runs great with good AFR, and no Knock every where, starts great hot or cold, does not stall hot or cold......
HOWEVER - my 1 problem that I have been unable to correct -
I've got a slow speed rolling to a stop stall issue when HOT only.
Also note If rolling at speed 20mph UP..... then let off gas idle drops down to desired rpm no problem and no stalling.
It's only at parking lot speed or in traffic when hot...... I drive in 1st gear up to 2-5mph..... then let off gas hit clutch and roll w/traffic.... idle goes unstable and drops to 400rpm.... desired is 900..... sometimes it will recover..... barely or it will stall if I don't stab the gas pedal quickly. Very hoopty way to drive
Intake - is a mamo ported Fast 92 with mamo ported big mouth TB, un-drilled plate.
IAC counts runs at 18-30 at idle. It does not change when this rolling to stop stall condition happens.
Idle timing @ 22 Deg which seems to give good vac at idle. I tried 25 and ex got smelly and idle unstable.
TPS shows 0 at idle. I have not tried to crack open the TB with the allen bolt, then reset TB blade yet.
Let me know where to work in my tune for this if you can help.
I can share my tune file and log file if it will help.
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UPDATE - just did a quick drive and attached the log file.
Now I'm noticing after 198 Deg F coolant.... car will try to stall on decel at all speeds...... I have to blip the throttle.
I also noticed the IAC counts drop to 12 during this condition.
thx for any input.