Compensating for 550cc with S-AFC (N/A)
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Compensating for 550cc with S-AFC (N/A)
OK- it's my problem for not having the wideband built yet... but at least I have the stock 02 sensor to see if I'm at least in the right ballpark....
Anyways- I am installing the 4 550cc injectors into my N/A motor, and doing it well before the turbo goes in...
OK- the 550's flow 20% more fuel than the 460's.... theoretically, I should lean my S-AFC out by 20% more across the board in addition to my tuned settings, and acheive the exact same mixture as running with the 460's.
Does this actually apply in reality when I install the 550's??
Thanks!
Dan
Anyways- I am installing the 4 550cc injectors into my N/A motor, and doing it well before the turbo goes in...
OK- the 550's flow 20% more fuel than the 460's.... theoretically, I should lean my S-AFC out by 20% more across the board in addition to my tuned settings, and acheive the exact same mixture as running with the 460's.
Does this actually apply in reality when I install the 550's??
Thanks!
Dan
#4
Re: Compensating for 550cc with S-AFC (N/A)
Originally posted by Bambam7
OK- it's my problem for not having the wideband built yet... but at least I have the stock 02 sensor to see if I'm at least in the right ballpark....
Anyways- I am installing the 4 550cc injectors into my N/A motor, and doing it well before the turbo goes in...
OK- the 550's flow 20% more fuel than the 460's.... theoretically, I should lean my S-AFC out by 20% more across the board in addition to my tuned settings, and acheive the exact same mixture as running with the 460's.
Does this actually apply in reality when I install the 550's
OK- it's my problem for not having the wideband built yet... but at least I have the stock 02 sensor to see if I'm at least in the right ballpark....
Anyways- I am installing the 4 550cc injectors into my N/A motor, and doing it well before the turbo goes in...
OK- the 550's flow 20% more fuel than the 460's.... theoretically, I should lean my S-AFC out by 20% more across the board in addition to my tuned settings, and acheive the exact same mixture as running with the 460's.
Does this actually apply in reality when I install the 550's
As for how much you should lean it out, if you tune it, then you won't need to worry about taking out 20% beyond your tuning point. If you tune the SAFC to work with the 4 550s then the 20% more flow will theoretically be negated. I would start with 5% taken out and work from there.
You might find you need to only take 10% out at low end, but 15% at top end. I think it was the 86-mid 87 EFI system that ran leaner up top than the other 2nd gens, so depending, 20% across the board might be too much or not enough for some spots on the rpm band
Carl
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silver88gxl- The car is already tuned with 460s.
If I want to maintain the same A/F ratios with 550's, I should theroetically lean every point out by 20% more...
Damn... where's RETed?
If I want to maintain the same A/F ratios with 550's, I should theroetically lean every point out by 20% more...
Damn... where's RETed?
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