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Starting to get colder out, figured I’d take the car out one last time before winter. Car is Procharged 11:1 heads and NA cam with Deka 60s. Haven’t dynod the car but it’s a 62cc 225 head and 235/243 111LSA cam car making around 9 PSI. No dynos close to me
Car is running a 340LPH racetronix with a boost referenced regulator feeding stock feed rails with a 6an Fragola return line. So 3/8s to 3/8s. Car also runs meth from 1 or 2 psi. Had issues this summer on a very hot day after an hour drive or so with what I think was cavitation so upgraded to boost ref’d with a larger return line and issue went away. In this case would the solution simply be to crank the FPR up a hair? Looks leaning out up top with the denser air and more boost per rpm, no problem but then I noticed my duty cycle and how it is linear but then takes off around 5800 rpm.
Thoughts on swapping to a single 450? Will this be too much pump for a street car? Kind of trying to avoid dual pump setups cause the drop ins are just easier for me, cost and labor wise.
These are Deka 60s. They should easily be capable of more than what I’m making..especially with meth right?..same thing with this pump too right? So wtf. Lol. It’s why I came here for thoughts and maybe some real world xp. I’m kind of leaning towards a drop in 450 single. But I’ve seen people recommend against doing that…
the thing that has got me is I think this is a rather new/progressive problem and I’ve been tuning with it, I’m at work but once I get home I’m going to try and find older logs. I honestly think the horror stories with this racetronix 340 are true and I’ve been tuning around growing flow loss..it seems the duty cycle trend takes a rather sharp turn up top around 5,800rpm where it didn’t before. The boost reference is raising PSI 1:1...does that mean pump is losing ability to flow at the higher psis?…One thing for sure though is I would swear people have pushed these Deka 60s into like 7xxwhp territory. And I mean I’m hopeful and all but there’s no way I’m making that much power lol. Also note I’m running a 10gph@100PSI hypersonic nozzle. The snow pump is supposed to be 300PSI.. even with 50/50meth it’s it’s got a decent amount of supplemental fueling with it.
EDIT: just a thought. I’m running stock feed and filter. Filter may be tapped out? I feel I’ve seen someone say flow here is 270ish lph. Filter possible culprit?
Last edited by mstansbury0704; Oct 16, 2022 at 04:15 PM.
So took the car out and filled up tank and meth. Made a hit. This duty cycle is close to the log from the morning once I compared at a similar rpm however my AFR is much closer to commanded. . On the log from the morning it seems at 6325RPM it breaks into 90% and increases rapidly. At 6450 it is 95.8% and 6,560 it’s broke 99%.. So I think I have two problems. For one I need to sit down at home and add some fuel blanket for the colder weather where I see a touch more kpa at rpm. And for two, maybe set my base psi up just a hair..I don’t have a way to measure fuel pressure drop while driving. What I’m lost on is how is a 340LPH and Deka 60s with methanol injection maxing out on a SBE heads cam car with 9PSI..does this sound right? this fuel pump kit was stated up to 800hp…
Last edited by mstansbury0704; Oct 16, 2022 at 04:17 PM.
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Out of pump? 
