VersaTune - knowledge base

[TD]

Yeah sure, I still think you'll see a dip in FP while the pump tries to play catch up, especially with the DP and race pipe fitted.

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On second thoughts maybe I won't...660 psi at full throttle and at full boost is territory I don't want to be in again...Sorry

[Caffeine Fiend]

...and dimissed by many in here for sometime, i think I rather be safe than sorry.

One of the BIG reasons I haven't done any intake/exhaust etc mods. Always suspected that the US guys weren't playing Chicken Little here but too much conflicting information


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[Yeldarb]

Yeah sure, I still think you'll see a dip in FP while the pump tries to play catch up, especially with the DP and race pipe fitted.

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On second thoughts maybe I won't...660 psi at full throttle and at full boost is territory I don't want to be in again...Sorry

Fair call mate. Pretty hairy stuff.

[kmh001]

I don't think a single result should be taken as a broad statement that the stock HPFP is deficient. It is known that there is significant variability in their performance, with some not performing so well. But i think those are in the minority. I've been logging fuel pressure for donkeys and have never come close to a low pressure event. That could change with tuning if fuel delivery volume increases beyond pump capacity.

A common sense approach would be to avoid wasting money on an expensive and unnecessary mod unless you have established that you actually have a demonstrated fuel pressure deficiency.

I certainly won't be changing my pump unless the data shows that I need to.

[TD]

I guess the point I was communicating is that when modifying your car, do logs and check them thoroughly to see all is working well, in my example things clearly aren't. It's also visible evidence that we can get the fuel pressure problem here in our climate and on the Australian cars, which is a heads up to those who have the capability to check for it to do so and at least provide yourself with peace of mind.

That log was done from 1800-6200rpm in 3rd gear with the foot flat to the floor. Every low fuel pressure event I have noted in my logs was below 4000rpm.