Intake Vacuum Leak Physical Check
This is way old school, but if you partially block the air intake at idle and RPMs increase, rather than drop, then there definitely is a vacuum leak. Have you tried that?
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Originally Posted by HiFlite999
(Post 4350920)
Where does calcLoad come from? It's a calculation. I don't see any obvious way to get that without MAF as an input parameter.
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we have a 2 speed fuel pump??
Does that factor in? |
I've always heard it referred to as a static pressure fuel pump as far as the injectors and latency are concerned, OD.
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Originally Posted by MPG > HP
(Post 4351057)
This is way old school, but if you partially block the air intake at idle and RPMs increase, rather than drop, then there definitely is a vacuum leak. Have you tried that?
I think you posted in the wrong thread |
Originally Posted by shadycrew31
(Post 4350609)
It appears the issues pops up when the calculated load hits 60 and above. Once it drops below 60 the injectors pop back on.
You can see it more clearly with this edited copy my friend made me. I personally would try addressing this in the fuel table first (7500 rpm/0.6 Load/3rd gear map). Messing with the VE map effects a number of other variables. Ultimately the P2s may not match up with the OE NA transition programming |
at 60% load and or a certain % of throttle position the fuel pump voltage changes.
I would think that you may want to check the fuel pressures during these periods. It is just another metric you want to eliminate before you start chasing tuning. The fpr is supposed to supply a constant pressure--very true. But you never know and it is a variable that could have this type of affect. Especially when you are such a high rpm and only using very light throttle. It probably is NOT Fp related---but it could be. |
It would increase flow/pressure at the change. The opposite is happening in this case (going dramatically lean with slightly higher load). Your technical expertise is in it's usual form; fubar.
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you are thinking in one dimension.
If the fuel pump is switching from low to high speed,or high speed to low speed functioning it is possible to have fluctuating fuel pressures. If that is happening then the the a/f's theoretically could be bouncing around. It would be interesting to do primary testing of the fuel delivery system constancy during the milliseconds that are being questioned. |
... or just put a fuel pressure gauge on it and make sure it's a steady 59 psi.
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you could never work for the government--lol.
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:Wconfused:scratchhe:uhh::dunno: I actually did for a while... not sure how that applies here... suspect you're referring to our government's stellar track record for efficiency.
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Lol--what I meant is you got to the point in a simple manner. If you worked for the government--then you know that would never be their way.
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yup... I'm with ya :)
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