more timing with positive LTRIMS?
more timing with positive LTRIMS? more timing with positive LTRIMS?
The debate continues...I've seen people say to get the ltrims to zero at cruise. I've seen people say to get them at a slight negative number because then the PCM will not add fuel. Finally, I've seen people say to get the LTRIMS to about + 10%, as it increases timing, thus, more power.
So, since there is no clear cut answer it seems, would you all reply to what you think, and WHY?
Obviously I want the most power at WOT.
This is confusing stuff.
__________________
SLP LT's w/ ORP
FTRA
Direct Flo Lid
Pace LS6 MAF
02 ZO6 Clutch & hydraulics, drill mod
SLP Shifter
!tb coolant
cut egr tube
NGK TR-55's
Nitto Drag Radials
Granatelli LCA's
MAFT
Best 1/8 8.595 (just a lid)
The debate continues...I've seen people say to get the ltrims to zero at cruise. I've seen people say to get them at a slight negative number because then the PCM will not add fuel. Finally, I've seen people say to get the LTRIMS to about + 10%, as it increases timing, thus, more power.
So, since there is no clear cut answer it seems, would you all reply to what you think, and WHY?
Obviously I want the most power at WOT.
This is confusing stuff.
__________________
SLP LT's w/ ORP
FTRA
Direct Flo Lid
Pace LS6 MAF
02 ZO6 Clutch & hydraulics, drill mod
SLP Shifter
!tb coolant
cut egr tube
NGK TR-55's
Nitto Drag Radials
Granatelli LCA's
MAFT
Best 1/8 8.595 (just a lid)
Re: more timing with positive LTRIMS? By my experience when I get - L-terms while cruising and 0% WOT my timiming is pulled back to 22 deg WOT.
Then with my L-terms +5% cruising and +6% WOT I'm getting 28deg timing.
So I'm thinking the MAFT has a direct affect on timing.
Then with my L-terms +5% cruising and +6% WOT I'm getting 28deg timing.
So I'm thinking the MAFT has a direct affect on timing.
Re: more timing with positive LTRIMS? </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Slowhawk:
<strong>By my experience when I get - L-terms while cruising and 0% WOT my timiming is pulled back to 22 deg WOT.
Then with my L-terms +5% cruising and +6% WOT I'm getting 28deg timing.
So I'm thinking the MAFT has a direct affect on timing.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Slowhawk, didn't you say you got rid of your MAFT because it made it feel slower? I would think with that much less timing, you would be slower? Confused.
<strong>By my experience when I get - L-terms while cruising and 0% WOT my timiming is pulled back to 22 deg WOT.
Then with my L-terms +5% cruising and +6% WOT I'm getting 28deg timing.
So I'm thinking the MAFT has a direct affect on timing.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Slowhawk, didn't you say you got rid of your MAFT because it made it feel slower? I would think with that much less timing, you would be slower? Confused.
Re: more timing with positive LTRIMS? .[/qb][/QUOTE]Slowhawk, didn't you say you got rid of your MAFT because it made it feel slower? I would think with that much less timing, you would be slower? Confused.[/QB][/QUOTE]
Yes I got rid of it because of the timing,I'm dynoing this Saturday to see the real story.
My sig has #'s of the MAFT.My A/F without the MAFT is a little richer.92WOT,but the seat of the pants seem to tell me there is more power.
Also with the MAFT my Nitrous A/F's were all over the place.Each run was different from the last.13-1 down to 11-1 with the same bottle pressure.
Yes I got rid of it because of the timing,I'm dynoing this Saturday to see the real story.
My sig has #'s of the MAFT.My A/F without the MAFT is a little richer.92WOT,but the seat of the pants seem to tell me there is more power.
Also with the MAFT my Nitrous A/F's were all over the place.Each run was different from the last.13-1 down to 11-1 with the same bottle pressure.
TECH Apprentice
Joined: Nov 2001
Posts: 392
Likes: 0
From: Williamsburg, VA
Re: more timing with positive LTRIMS? In my limited experience I found that the MAF-T base settings have no effect on A/F settings since the PCM maintains the correct A/F ration in open loop. The base settings skew the calculated load fed into the PCM and is useful for maximizing timing, i.e., less load = increased timing. The WOT setting will affect A/F at WOT. What happens with positive ltrim's is the PCM will add more fuel at WOT. At zero and negative ltrims, no extra fuel is added. Since the WOT settings are only in 2% increments, WOT A/F can be adjusted some, but not that much if your bent on getting lots of timing by dialing in high ltrims. I've had the best luck with dialing in the timing to about 29 degrees and then tweaking the WOT so my O2's are around .89.
