HPFP issues?

[Giuseppe Busso]

What fuel are you running? The stock pump should be good with an IS38, until E30ish. But the pump on the 1.8T might be less capable of flow than the 2.0T ones, that I am not sure of.

Only 100 octane. BP Ultimate or Shell V-Power Racing.

 

[Giuseppe Busso]

https://datazap.me/u/giuseppe-busso/fuelis38?log=0&data=0-4&mark=10-11-14&trim=5&tmin=0.98&tmax=2.61

I know it's not a proper log but this is a pull from 3rd and change to 4rth.
3rd @3593rpm HPFP is at 200bar and as i revving the pressure falls.
When I changed to 4rth i had the big cut, maybe ECU closed the throttle.
Is that a HPFP issue or fuel is at its limits?
@Diggs24 I would like to hear your opinion... thanks

 

[Diggs24]

add high pressure specified, but also this is very low

 

[Diggs24]

which could just mean that the hpfp needs drilled at the output for the low rail. adding specified for low rail will confirm.

 

[Giuseppe Busso]

which could just mean that the hpfp needs drilled at the output for the low rail. adding specified for low rail will confirm.

add high pressure specified, but also this is very low

View attachment 304036

Hey @Diggs24

this is a full WOT with 4rth gear
https://datazap.me/u/giuseppe-busso/wot4rth?log=0&data=0-3-5-6

and this is with 2nd, 3rd, 4rth WOT
https://datazap.me/u/giuseppe-busso/wot234gearsis38?log=0&data=0-3-5

 

[Diggs24]

Seems pretty normal on a 1.8 HPFP with an IS38.
Enlarge orifice on HPFP to feed low side rail (or put a T in the fuel line prior to HPFP and feed the MPI rail prior to HPFP).
Upgrade to 980cc Bosch MPI injectors with new connectors.
Adjust tune to accommodate larger injectors.
Enjoy.

 

[golfRdaddy]

No issues with my HPA hpfp, when I was stage 2 IE Flex fuel it only cut out if I ran pure e85. When I would throw a gallon or two of regular gas with the e85 it never had a hiccup.

 

[Giuseppe Busso]

Seems pretty normal on a 1.8 HPFP with an IS38.

Diggs was right... I sent the logs to my tuner and told me the same. Fuel is at its limits.
However, my concerns were if my HPFP have any issue.

ps. HATS OFF

 

[Daks]

No issues with my HPA hpfp, when I was stage 2 IE Flex fuel it only cut out if I ran pure e85. When I would throw a gallon or two of regular gas with the e85 it never had a hiccup.

That HPFP is shit.

 

[golfRdaddy]

That HPFP is shit.

Why is it dodo? What hpfp have you used?

 

[Daks]

Why is it dodo? What hpfp have you used?

That one. It also failed literally everyone else that used it. I think Oscar the grouch aka @scrllock said,if you have an hpa hpfp on your car and you have a problem. It's the hpfp.

 

[scrllock]

That one. It also failed literally everyone else that used it. I think Oscar the grouch aka @scrllock said,if you have an hpa hpfp on your car and you have a problem. It's the hpfp.

fwiw at least the failures are very front-loaded. if it makes it past like 5k miles, you're probably golden. the advantage to the HPA is that when it fucks up, you're warrantied AND still have your stock hpfp to swap to.
if I had to avoid MPI for some reason, I'd rank them like this, price aside:

1) nostrum - their hpfp valve solenoid is nicer and has better control over the relief valve at high rpm. plus pre-assembled, lifetime warranty.
2) APR - fully-assembled and has an upgraded spring to combat valve float the proper way.
3) IE - some nice perks over the autech internals, their tool is nice. but still DIY.
4) HPA - it's pre-assembled and at least the failure mode isn't catastrophic.
5) autech internals - literally the bare minimum.
6) actually no 034 is the bare minimum - if you trust 034 with your fueling you need your head examined. clearly bottom-bid aliexpress units

 

[golfRdaddy]

That one. It also failed literally everyone else that used it. I think Oscar the grouch aka @scrllock said,if you have an hpa hpfp on your car and you have a problem. It's the hpfp.

Good to know, lucky I got mine for free. Mine leaked from the MPI adapter plug and they wanted me to buy a special tool to fix it. I had to shave down a socket to fit it.. so I could tighten it. Disputed it with paypal and was refunded. Not sure if I've put 5K on it yet.

 

[MonkeyMD]

fwiw at least the failures are very front-loaded. if it makes it past like 5k miles, you're probably golden. the advantage to the HPA is that when it fucks up, you're warrantied AND still have your stock hpfp to swap to.
if I had to avoid MPI for some reason, I'd rank them like this, price aside:

1) nostrum - their hpfp valve solenoid is nicer and has better control over the relief valve at high rpm. plus pre-assembled, lifetime warranty.
2) APR - fully-assembled and has an upgraded spring to combat valve float the proper way.
3) IE - some nice perks over the autech internals, their tool is nice. but still DIY.
4) HPA - it's pre-assembled and at least the failure mode isn't catastrophic.
5) autech internals - literally the bare minimum.
6) actually no 034 is the bare minimum - if you trust 034 with your fueling you need your head examined. clearly bottom-bid aliexpress units

And here i thought the Autotech was the gold standard.

 

[scrllock]

And here i thought the Autotech was the gold standard.

no, it's just the most popular because it's the cheapest.