callmeebryan
Member
- Joined
- Jun 24, 2007
Ok, first off i would like to say that i already have experience with standalone computers. My previous car had a Haltech E8 standalone computer which i tuned by myself. Ive come to find that this computer isnt much different than the Haltech computer as far as tuning goes.
I bought my car july 3rd. The car ran like crap when i bought it... the tune was horrible. I have tweaked pretty much everything in the FAST including the base fuel map, timing map, closed loop map, throttle follower, IAC settings, Coolant and air temp corrections, crank maps, etc etc etc.
With that being said, i have my car running in closed loop all the time, and have been working very hard to keep the O2 correction within +/- 5% all the time. Idle , cruising, and WOT i have accomplished that.
12.6 AFR at idle, 14.9 AFR while cruisng, and 11.4 AFR at WOT (running 19psi on 93 octane without alky).
33* timing at idle, 35-36* timing while cruising, 18* timing at WOT.
Now for the issues im having
1. I have tuned the car a couple of times doing rolling pulls. I have my VE maps tuned for that and the O2 correction is never more than 8% +/- as i get into boost. However, when i go to brake boost the car for a street launch (building boost to about 5psi for a launch), the correction is off the chart... sometimes reaching nearly +20%. Ill put my foot to the floor while releasing the parking brake, boost will build, and it will slowly go down from 20% back to within +/- 5% after about 16psi. Now if i tune the car to have +/- 5% correction while brake boosting, the tune for a rolling pull will be around -15%. I've been pulling my hair out trying to fix this, and have finally decided to ask for opinions. I have plenty of logs that illustrate what is going on if you would like me to send them to you.
2. When i give the throttle a quick pump from idle, it will rev up, fall back down to idle, and then 2 seconds of fine idle, then the car will dip 100-150rpms (from 850 down to as much as 680), struggle, and fix itself. I have noticed that when the car is leaner at idle, it will struggle alot more than when it is richer... this is why i have the car idling at 12.6. 2 of my friends have turbo buick's with the stock computer and their AFR's at idle are around 14.7.... thats where im trying to bring mine. You guys have any pointers for fixing this?
3. The car sometimes struggles to start when it is at running temp (170*). Ill have to get about 15% throttle for it to start up. Im assuming my crank map needs adjustments, aswell as my IAC settings. I have timing at around 30* for cranking.... should i decrease this a bit? Or is it somethingelse? I remember in my previous car i have timing at around 18* for startup.
- Thanks in advance.
I bought my car july 3rd. The car ran like crap when i bought it... the tune was horrible. I have tweaked pretty much everything in the FAST including the base fuel map, timing map, closed loop map, throttle follower, IAC settings, Coolant and air temp corrections, crank maps, etc etc etc.
With that being said, i have my car running in closed loop all the time, and have been working very hard to keep the O2 correction within +/- 5% all the time. Idle , cruising, and WOT i have accomplished that.
12.6 AFR at idle, 14.9 AFR while cruisng, and 11.4 AFR at WOT (running 19psi on 93 octane without alky).
33* timing at idle, 35-36* timing while cruising, 18* timing at WOT.
Now for the issues im having
1. I have tuned the car a couple of times doing rolling pulls. I have my VE maps tuned for that and the O2 correction is never more than 8% +/- as i get into boost. However, when i go to brake boost the car for a street launch (building boost to about 5psi for a launch), the correction is off the chart... sometimes reaching nearly +20%. Ill put my foot to the floor while releasing the parking brake, boost will build, and it will slowly go down from 20% back to within +/- 5% after about 16psi. Now if i tune the car to have +/- 5% correction while brake boosting, the tune for a rolling pull will be around -15%. I've been pulling my hair out trying to fix this, and have finally decided to ask for opinions. I have plenty of logs that illustrate what is going on if you would like me to send them to you.
2. When i give the throttle a quick pump from idle, it will rev up, fall back down to idle, and then 2 seconds of fine idle, then the car will dip 100-150rpms (from 850 down to as much as 680), struggle, and fix itself. I have noticed that when the car is leaner at idle, it will struggle alot more than when it is richer... this is why i have the car idling at 12.6. 2 of my friends have turbo buick's with the stock computer and their AFR's at idle are around 14.7.... thats where im trying to bring mine. You guys have any pointers for fixing this?
3. The car sometimes struggles to start when it is at running temp (170*). Ill have to get about 15% throttle for it to start up. Im assuming my crank map needs adjustments, aswell as my IAC settings. I have timing at around 30* for cranking.... should i decrease this a bit? Or is it somethingelse? I remember in my previous car i have timing at around 18* for startup.
- Thanks in advance.
