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SVTPerformance's Chain of Restaurants
Tuning À la carte
[help] Cold Tip-in Issue
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<blockquote data-quote="itzl0l" data-source="post: 14633924" data-attributes="member: 98334"><p>I've been meaning to get back to this post. I had this issue....and I also had an issue with a lean spot at 1500 rpm's that I couldnt get rid of. When I say I tried everything, I tried all the conventional stuff to resolve both issues. (manifold vol, lwfm, timing, transients, cold fuel tables.... you name it, i tried it)</p><p></p><p>I have a BA3000 maf and JLT high boost intake...</p><p>60# inj</p><p>I use the BP modifier method (tho the issue was present even with the traditional scaling method)</p><p></p><p>I found that I had to make fairly large corrections to the MAF xfer curve to get the car to even idle with the JLT intake ...around 20% increase in xfer values.</p><p></p><p>In the end....and how I fixed both issues: I used the 60# val file (as always), used the BA3000 file (as always), but instead of adjusting the maf xfer up by 20% I reduced the injector high/low/breakpoint by 20%. Simplified explanation is that reducing slopes will richen the car... Then I only had to tweak the maf xfer, just a small adjustment hear and there...had to take a little out at wot (5% ish). Load is slightly lower, 17 @ idle.... 175 ish at wot... so I had to re-normalize the timing tables a bit. Car is flawless now ...they say dont mess with slopes, i tried for the longest not to. At this point I dont care if its "right or wrong".</p></blockquote><p></p>
[QUOTE="itzl0l, post: 14633924, member: 98334"] I've been meaning to get back to this post. I had this issue....and I also had an issue with a lean spot at 1500 rpm's that I couldnt get rid of. When I say I tried everything, I tried all the conventional stuff to resolve both issues. (manifold vol, lwfm, timing, transients, cold fuel tables.... you name it, i tried it) I have a BA3000 maf and JLT high boost intake... 60# inj I use the BP modifier method (tho the issue was present even with the traditional scaling method) I found that I had to make fairly large corrections to the MAF xfer curve to get the car to even idle with the JLT intake ...around 20% increase in xfer values. In the end....and how I fixed both issues: I used the 60# val file (as always), used the BA3000 file (as always), but instead of adjusting the maf xfer up by 20% I reduced the injector high/low/breakpoint by 20%. Simplified explanation is that reducing slopes will richen the car... Then I only had to tweak the maf xfer, just a small adjustment hear and there...had to take a little out at wot (5% ish). Load is slightly lower, 17 @ idle.... 175 ish at wot... so I had to re-normalize the timing tables a bit. Car is flawless now ...they say dont mess with slopes, i tried for the longest not to. At this point I dont care if its "right or wrong". [/QUOTE]
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SVTPerformance's Chain of Restaurants
Tuning À la carte
[help] Cold Tip-in Issue
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