FTRA + A/F ratio
Thread Starter
Staging Lane
Joined: Jun 2002
Posts: 67
Likes: 0
From: Milford, MA
FTRA + A/F ratio I am having a really tough time getting my MAFT dialed in correctly and think FTRA may be the reason. On a DYNO at Base 15% rich WOT 4% lean the car starts out being 12.2:1 until about 3500 RPMS and then climbs to 13:1 from about 4000 RPM's to 6000 RPM's. If I run these settings on the street I get pinging at high RPM's. I also noticed that my Prior Dyno sheet (MAFT settings base 10% rich WOT 0) in which my A/F ratio was 12.7:1 across the board I was making considerably more torque at the bottom end (about 15 RWTQ more). However on the street there was once again pinging at the higher RPM's. I'm gonna try running at the Base 10% rich setting for now which gives me a 12.7:1 A/F ratio on the DYNO and slighty positive LTtrims on the street. I'm gonna work on going a little rich on the WOT switch to eleviate the pinging. Here are some questions:
1. Does anyone know through any testing roughly how many points FTRA effects your A/F ratio?
2. I noticed at my last DYNO session that the cars making the most power started lean and richened up at the top end? For instance one guy imparticular had about a 13.5:1 A/F ratio prior to 4000 RPM's and 12.7:1 from 4000 RPM's to redline. He made good power throughtout the RPM range.
3. Should LTtrims always be zero at WOT?
4. Is it bad to have your MAFT WOT switch on the rich side? I've been told that shouldn't be necessary?
Any advice will be helpful!!!!
Note: I do have ATAP and know about O2's being between .88 and .91 at WOT and LTtrims at part throttle being as close to 0 as possible but since I had the wideband seesion am just thinking a little differently.
1. Does anyone know through any testing roughly how many points FTRA effects your A/F ratio?
2. I noticed at my last DYNO session that the cars making the most power started lean and richened up at the top end? For instance one guy imparticular had about a 13.5:1 A/F ratio prior to 4000 RPM's and 12.7:1 from 4000 RPM's to redline. He made good power throughtout the RPM range.
3. Should LTtrims always be zero at WOT?
4. Is it bad to have your MAFT WOT switch on the rich side? I've been told that shouldn't be necessary?
Any advice will be helpful!!!!
Note: I do have ATAP and know about O2's being between .88 and .91 at WOT and LTtrims at part throttle being as close to 0 as possible but since I had the wideband seesion am just thinking a little differently.
