P-Pump 24v Idle Surge
I've seen a little about this on here, but no real clear answers on how to solve this. I am working on a 99 24v with a p-pump swap. The components I am aware of (I only did part of the build) are as follows:
-180 pump with 7mm dv, 4k springs, hamilton v2 pump cam and springs -DDP custom injectors (I don't recall exact flow specs, but around 52-56 lph I believe) -Industrial Race twins (older with 66 Silver and 87 mm S4T) -Built trans with Stock stall, maybe 2200 rpm? -FASS 260 with TorkTek orifice overflow The problem is it surges a little in neutral, but when dropped in gear it surges really badly. I've built similar pumps for 12 valves that did not have this issue. I've heard it may be injector related, but not exactly which way a person would go to help alleviate the issue. I have tried different idle springs and idle rpm settings to no avail. I also swapped from 191 to 7mm dv, which did not help the surge. So has anyone been able to solve this issue? And be willing to share what they determined? I know some surging is normal with tight governor springs and built trans, but this is extreme. |
Did you try backing off the gov springs 1 click to see if it helped?
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Ya, I even tried different idle springs. No help.
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Is it like a lope?
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Ya you could call it a lope
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Which size did you choose for your injection lines?
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What is it timed At? I'd try playing with the timing a little. The One and only p24v I've been around needed alot of timing to run right.
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I have not seen a v2 cam idle smooth yet. Imo it needs more timing but I do not see that helping your current situation. May want to verify pop pressure.
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When I was playing with the p-pumped 24, I discovered how injector sensitive they were. Once I figured that out I found a place to get them made and stopped fighting it.
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I believe they are 12 valve springs in the injectors.. They were built for a p pump application
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