Holley efi fpr regulator question.
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Does a stock LS vacuum reference the fuel pressure?
I just don't like FP messing with my tune when there is no need to
Last edited by T.Fiddler; 11-09-2015 at 09:09 PM.
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#8
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I can't tell you how many blown/turbo cars I've helped tune and the first thing I see is the line on the regulator is missing. I ask about it and they look at me like I'm the crazy one. I had one guy tell me that he uses the BAP instead of a vac/boost reference cause it's better. I walked away from that one.
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My car is 5 bar (71 psi) FP with no reference.
Thanks for the input
Last edited by T.Fiddler; 11-10-2015 at 11:02 AM.
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I started with my fpr referenced to both vacuum and boost(to the manifold pressure), but ended up only referencing to boost.
with the vacuum connected, the low rpm fueling was all over the place, I assume the lopey cam I run caused fluctuations in fuel flow that made it hard to tune idle and off idle. Once I removed the vacuum reference, and tuned accordingly, all was good.
with the vacuum connected, the low rpm fueling was all over the place, I assume the lopey cam I run caused fluctuations in fuel flow that made it hard to tune idle and off idle. Once I removed the vacuum reference, and tuned accordingly, all was good.
Last edited by 3pedals; 11-10-2015 at 10:02 AM.
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I started with my fpr referenced to both vacuum and boost(to the manifold pressure), but ended up only referencing to boost.
with the vacuum connected, the low rpm fueling was all over the place, I assume the lopey cam I run caused fluctuations in fuel flow that made it hard to tune idle and off idle. Once I removed the vacuum reference, and tuned accordingly, all was good.
with the vacuum connected, the low rpm fueling was all over the place, I assume the lopey cam I run caused fluctuations in fuel flow that made it hard to tune idle and off idle. Once I removed the vacuum reference, and tuned accordingly, all was good.
WHEW! at least I am not the only one !
#16
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I only run a boost line-with vac. also it pulled down the FP from 43 to around 36, kind of ads to the tuning
Nascar used to use the vac to lean out the engines on caution laps to get a clean restart, but I just never saw any advantage otherwise-not sure if they use it on FI now
Nascar used to use the vac to lean out the engines on caution laps to get a clean restart, but I just never saw any advantage otherwise-not sure if they use it on FI now