c5 big cam tuning: stop me from drilling a hole in my throttle body.
10-28-2006, 06:55 PM
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c5 big cam tuning: stop me from drilling a hole in my throttle body. I think i've tried tweaking everything at this point, but i KNOW theres definitly people out there with bigger cams than mine getting them to idle. IT just wont idle and stalls constantly with a 111 lsa cam. I lowered the idle airflow tables to like 5g/s at temp and didnt do anything.. played with a/f and spark, nothing. If i hold the gas at like 11% tps though it will idle great with the o2's cycling and all at 900 rpm. 14.7 on the wideband with my foot on the gas slightly at the 11% mark.
Help me, this seems alot trickier than getting camaros to idle.
Help me, this seems alot trickier than getting camaros to idle.
10-28-2006, 07:18 PM
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Lowering the airflow is not going to give it what it needs.
Log the airflow actuals (dynamic airflow) with the throttle
cracked how you like it, and use that value for the base
running airflow point at hot motor. For colder, bump it up
along a curve similar to what you see for a stocker but
proportional to the "value that works".
Is there anything funny about the TB that would make
airflow vs TPS (the electric throttle real angle, not
the pedal) different than stock "effective area"?
Log the airflow actuals (dynamic airflow) with the throttle
cracked how you like it, and use that value for the base
running airflow point at hot motor. For colder, bump it up
along a curve similar to what you see for a stocker but
proportional to the "value that works".
Is there anything funny about the TB that would make
airflow vs TPS (the electric throttle real angle, not
the pedal) different than stock "effective area"?
10-28-2006, 07:21 PM
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nope, stock tb.
so log dynamic a/f in G/S when i have the throttle body open enough to idle, throw it in the idle airflow table and it should open the TB more on its own? theres no other values i should really touch then with stock TB?
so log dynamic a/f in G/S when i have the throttle body open enough to idle, throw it in the idle airflow table and it should open the TB more on its own? theres no other values i should really touch then with stock TB?
10-28-2006, 07:33 PM
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This may sound stupid, but why don't you just bump the idle speed up to 850 or 900 RPMs? I know of a fellow C5-er that has a 112 cam and that's basically all he did. It shudders every now and again, but overall idles pretty well, considering the 'lumpy' idle.
10-28-2006, 07:52 PM
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that was the first thing i did, of course. actually, setting the idle speed to anything changes nothing, the car just dies unless i apply the throttle to at least 11%
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10-28-2006, 09:19 PM
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Wait4Me:
Thanks a million for the late night non customer tech support! car idles smooooth now, after 15 minutes of tinkering after talking to you last on the phone.
A++++ to you in (non)customer support -- maybe i'll be looking at some efilive products very soon.
Thanks a million for the late night non customer tech support! car idles smooooth now, after 15 minutes of tinkering after talking to you last on the phone.
A++++ to you in (non)customer support -- maybe i'll be looking at some efilive products very soon.
10-29-2006, 11:53 AM
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Originally Posted by wait4me
Glad you got it working! Congrats on those awsome numbers!
10-29-2006, 01:14 PM
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Originally Posted by TT Coupe
one problem now... if i leave it idling for like 5 minutes it will throw an excess airflow to TP code and kill the car and not start until its cleared. Im guessing this is from me raising the Base Running Airflow too high? It's at 13.5g/sec in the normal operating temperature cells now.
please enlighten us as to what worked for you 