Horrible time tuning big cam
08-30-2012, 07:13 AM
#1
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Horrible time tuning big cam I just rebuilt a 347ci NA 11.7:1 SCR and decided to install a 268/270 at .050" 108lsa cam
I first started off the car on E85 and went through attempting to drive it on E85, It would idle fine (sometimes) and not rev to well.
I would attempt to take off but it would "choke" and go lean. I would keep adding fuel when in SD to the VE table in the correct areas and it would still have that issue.
I am now attempting to run it off gas and am having the same issue.
I have a fuel pressure gauge on the car while its running and it reads steady at 58psi when the lean event would occur.
heres a log of whats happening and a tune file.
Was wondering if I can get some input on this.
Also running LS7 style MAF
Thanks!
I first started off the car on E85 and went through attempting to drive it on E85, It would idle fine (sometimes) and not rev to well.
I would attempt to take off but it would "choke" and go lean. I would keep adding fuel when in SD to the VE table in the correct areas and it would still have that issue.
I am now attempting to run it off gas and am having the same issue.
I have a fuel pressure gauge on the car while its running and it reads steady at 58psi when the lean event would occur.
heres a log of whats happening and a tune file.
Was wondering if I can get some input on this.
Also running LS7 style MAF
Thanks!
Last edited by importkiller_SS; 08-30-2012 at 08:43 AM.
08-30-2012, 09:38 AM
#6
I'm not of any help, I did look at your log file. You can see the injector pulse go the wrong way & yet you've added a bunch to the MAF & VE tables.
When you tried working the MAF & VE did you fail each one? I really don't think that is what you have going with this.
When you tried working the MAF & VE did you fail each one? I really don't think that is what you have going with this.
08-30-2012, 09:49 AM
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When i tuned for SD i put the "MAF fail high" to 0hz.
When i tuned for MAF i changed the value to 13,500 hz for the "MAF fail high"
Of course i have it in OL by disabling LTFTs and setting the "Closed loop enable ECT vs IAT" to 284*
I should note, I did a 98 to 2002 PCM swap and re-pinned the whole harness to do so. I did the segment swap for the fuel gauge to work also.
I did a continuity check from every pin at the pcm connector to the correct sensor/location
When i tuned for MAF i changed the value to 13,500 hz for the "MAF fail high"
Of course i have it in OL by disabling LTFTs and setting the "Closed loop enable ECT vs IAT" to 284*
I should note, I did a 98 to 2002 PCM swap and re-pinned the whole harness to do so. I did the segment swap for the fuel gauge to work also.
I did a continuity check from every pin at the pcm connector to the correct sensor/location
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08-30-2012, 10:08 AM
#10
What is the diameter inlet on the filter for that, I was thinking about running a similar setup on my car once I delete the foam and get a tubular bumper support but making it out of aluminum and running it a bit lower to sit behind the opening in the bumper.
Sorry for the thread highjack
Sorry for the thread highjack
08-30-2012, 10:11 AM
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What is the diameter inlet on the filter for that, I was thinking about running a similar setup on my car once I delete the foam and get a tubular bumper support but making it out of aluminum and running it a bit lower to sit behind the opening in the bumper.
Sorry for the thread highjack
Sorry for the thread highjack
08-30-2012, 10:29 AM
#13
Just curious did you watch the injector pulse as you tried to richen the VE & MAF tables?
It seems that it is going the opposite way you want....previous logs to compare?
Mr. Slowhawk is right about the MAF not failing, I've been there done that more than once with HPT. Zero the MAF table as well as the rest of the process.
It seems that it is going the opposite way you want....previous logs to compare?
Mr. Slowhawk is right about the MAF not failing, I've been there done that more than once with HPT. Zero the MAF table as well as the rest of the process.
08-30-2012, 10:34 AM
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I would go to a seperate IAT sensor and go SD on that... Also, you gotta have some hella high IATs pulling hot air right off the radiator with that filter like that - I would change that for sure!
08-30-2012, 10:36 AM
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Just curious did you watch the injector pulse as you tried to richen the VE & MAF tables?
It seems that it is going the opposite way you want....previous logs to compare?
Mr. Slowhawk is right about the MAF not failing, I've been there done that more than once with HPT. Zero the MAF table as well as the rest of the process.
It seems that it is going the opposite way you want....previous logs to compare?
Mr. Slowhawk is right about the MAF not failing, I've been there done that more than once with HPT. Zero the MAF table as well as the rest of the process.
I do not have any previous 93 octane logs. The previous log i have is when i ran it on E85.
I will zero my MAF table when i attempt it again later today.
Thanks for the tip
08-30-2012, 10:41 AM
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IAT at idle isnt the best but it cools down really fast when slightly moving. I have made shrouds to direct air directly to the radiator/ intake setup and i have my puller fans pulling most of the hot air away from it.
not much different than a stock intake setup where it pulls air across the front of the radiator then into the intake.
heres another example of it "shrouded"
08-30-2012, 05:42 PM
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I am now having a big issue when taking off. It doesnt make sense to me at all, the commanded AF is 14.68 throughout the sweep on the one take-off in the log and my injector pulse widths still increases.. It pegs lean (18:1) and stumbles to no power, like if it had TCS. It will idle ok and that is about it.
heres a new log and updated tune file. Now strickly running SD.
Thanks for all your input.
heres a new log and updated tune file. Now strickly running SD.
Thanks for all your input.
08-30-2012, 10:10 PM
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But if that is still giving me problems i can simply cut the wire.
Thanks