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newbie chevy tpi setting. not idling good help.
Posted: Sat Sep 17, 2011 4:18 pm
by jz2518
i have a stock chevy 350 with a 24lbs injectors. and I using tach signal from a big hei. Only running fuel. It doesn't want to idle right. Also it have a small hesation when i press on the gas. Could any one check to see if i have the settings right on megasquirt.
Re: newbie chevy tpi setting. not idling good help.
Posted: Sat Sep 17, 2011 4:57 pm
by Hahns5.2
Need more details. What kind of AFRs at idle? Hesitation is a result of poor AE tuning assuming your VE table is tuned well. I notice you're running a huge 200%/s TPSdot threshold which is a big part of that hesitation.
Re: newbie chevy tpi setting. not idling good help.
Posted: Sat Sep 17, 2011 6:00 pm
by jz2518
i updated the msq with the one that DIYAutoTune has on its website for a tbi. I just change it for 8 injector setup. Also a a did a datalog.
Re: newbie chevy tpi setting. not idling good help.
Posted: Sun Sep 18, 2011 6:08 am
by a73camaro
What Wide Band Air/Fuel Ratio device are you using?
Re: newbie chevy tpi setting. not idling good help.
Posted: Sun Sep 18, 2011 10:06 am
by jz2518
narrow band. Does any one have a msq file for a stock tpi.
Re: newbie chevy tpi setting. not idling good help.
Posted: Sun Sep 18, 2011 11:12 am
by kjones6039
Hahns5.2 wrote:Need more details. What kind of AFRs at idle? Hesitation is a result of poor AE tuning assuming your VE table is tuned well. I notice you're running a huge 200%/s TPSdot threshold which is a big part of that hesitation.
I agree with Hahns. I have run the same setup before with good success. I have a couple msq's (1-fuel only and 1-with hei) that I will have to look for so that could take some time. In the mean time a log would be helpful.
Ken
Re: newbie chevy tpi setting. not idling good help.
Posted: Mon Sep 19, 2011 4:59 am
by Matt Cramer
Try a little less advance and a little more fuel. I'm pretty sure stock TPI motors did not idle at stoich very well.
Re: newbie chevy tpi setting. not idling good help.
Posted: Mon Sep 19, 2011 6:55 am
by kjones6039
kjones6039 wrote:In the mean time a log would be helpful.
Don't know why the *&^$# I typed that......
I agree with Matt. My tpi certainly needed more fuel at idle.
Ken
Re: newbie chevy tpi setting. not idling good help.
Posted: Tue Sep 20, 2011 5:59 am
by WASyL
from what i found:
you have 24's but config has 30's in injector control
dwell is 3.5, try range od 2-2,5
best regards