[ronanz]

Originally Posted by Sµpreme

The reason to move to an upgraded HPFP is to avoid rail pressure drops at WOT. The primary contributing factor we've seen for rail pressure drops is that ethanol has a significantly lower stoich value than pump gas, which means that although it's higher octane, you need more volume of fuel, which the stock hpfp can't keep up with.
I don't think we've seen any rail pressure drops with pump fuel on a stock turbo/stock HPFP with a good flash tune.

All that being said, custom tune is always going to get you better results than OTS and an upgraded HPFP will give the tuner even more headroom to work with. You might see some gains, but they won't be what you'd get from the upgraded HPFP if you were using an ethanol blend.

Well said .

.

[SC_B5X]

Logs of Dorch Stage 1 HPFP running E40 on Pure800 turbo. Seems to be holding up better than expected, rail pressure is dipping a little bit but only down to 2500PSI which isn't enough to cause issues. I'll keep everyone updated as tuning progresses.

Logs:
https://datazap.me/u/richmichael97/w...33-34-35-36-37

[kern417]

Originally Posted by SC_B5X

Logs of Dorch Stage 1 HPFP running E40 on Pure800 turbo. Seems to be holding up better than expected, rail pressure is dipping a little bit but only down to 2500PSI which isn't enough to cause issues. I'll keep everyone updated as tuning progresses.

Logs:
https://datazap.me/u/richmichael97/w...33-34-35-36-37

This is why we need an injection timing parameter. We used to log that over fuel pressure so we could see if they were sticking open for too long.

I've also seen someone target lower pressures (Can't remember if it was you or not). Maybe see if it'll hold 2600 through the rev range.

[Nugget]

My Wedge tune seems to target 2600psi rail pressure.
This is just the base map with no revisions, so not complete.
https://datazap.me/u/nugs/log-158039...&data=15-16-18

Pure Stage 2 (old version not the 800)
high flow catted DP
XDI35

[kern417]

Originally Posted by Nugget

My Wedge tune seems to target 2600psi rail pressure.
This is just the base map with no revisions, so not complete.
https://datazap.me/u/nugs/log-158039...&data=15-16-18

Pure Stage 2 (old version not the 800)
high flow catted DP
XDI35

Yep, it was probably your log I'm remembering then. Slightly less efficient but more reliable and safer than letting it struggle IMO.

[johnung]

Originally Posted by weehe126

Pump fuel and HPFP upgrades seems to be a reoccurring question. I think based on Pure's testing alone, if you will only ever run pump fuel the Supra HPFP is all you need. They ran out of octane before running out of fuel from my understanding.

As soon as you add any E85 you should start looking at the stage 1 pumps, stage 2 if you have an upgraded turbo.

My head is spinning a bit from reading hpfp posts. If you're just running stock turbo with 93 octane, does the Supra hpfp offer any advantages to other hpfp options, like is the Supra hpfp less expensive or is it an easier plug-n-play installation? Thanks!

[weehe126]

Originally Posted by johnung

My head is spinning a bit from reading hpfp posts. If you're just running stock turbo with 93 octane, does the Supra hpfp offer any advantages to other hpfp options, like is the Supra hpfp less expensive or is it an easier plug-n-play installation? Thanks!

No, if you are on the stock turbo and pump fuel an upgraded HPFP will do nothing.

[G.Newt]

Originally Posted by johnung

My head is spinning a bit from reading hpfp posts. If you're just running stock turbo with 93 octane, does the Supra hpfp offer any advantages to other hpfp options, like is the Supra hpfp less expensive or is it an easier plug-n-play installation? Thanks!

Look at the first post. It includes links with product pages/descriptions, prices, etc. It also tells you how plug-and-play each of them are.

[SC_B5X]

Originally Posted by kern417

This is why we need an injection timing parameter. We used to log that over fuel pressure so we could see if they were sticking open for too long.

I've also seen someone target lower pressures (Can't remember if it was you or not). Maybe see if it'll hold 2600 through the rev range.

My tune also lowered the rail pressure to 2600PSI. It was something Steven tried and turned out to work well.

[kern417]

Originally Posted by weehe126

No, if you are on the stock turbo and pump fuel an upgraded HPFP will do nothing.

*Without a custom tune

[theone1973]

Order second hand pump and costume tune by Pureboost.

I let you guys know results later...3,4,5,6 days before I get the pump.

I´ll be back !

[tobefair-idontcare]

Currently running an MP stage 2.5 tune and full exhaust. Question is: if I wanted to run a Pure stage 1 what’s the max power I could make before I would need an upgraded HPFP? If I installed the Supra HPFP what kind of power is possible? Would I need anything else for this setup other than the turbo and pump? Everything will be run on pump 93, FYI. Thanks.

[weehe126]

Originally Posted by kern417

*Without a custom tune

From everything I've seen you still won't run out of fuel on pump gas with a custom tune on the stock turbo. The stock turbo is octane limited. As soon as you add E85, yes an upgraded hpfp is useful even on stock turbo.

[kern417]

Originally Posted by weehe126

From everything I've seen you still won't run out of fuel on pump gas with a custom tune on the stock turbo. The stock turbo is octane limited. As soon as you add E85, yes an upgraded hpfp is useful even on stock turbo.

You can definitely increase boost past the limits of the OEM fuel pump. I have yet to see anyone max out the turbo on pump gas. 18psi is nothing imo.

[weehe126]

Originally Posted by kern417

You can definitely increase boost past the limits of the OEM fuel pump. I have yet to see anyone max out the turbo on pump gas. 18psi is nothing imo.

That was my point. The person I quoted was specifically asking if there was any benefit to an upgraded hpfp when only running pump fuel on a stock turbo. I doubt you could even come close to maxing out the stock turbo on pump fuel.

[Supr3me]

Has anyone else who has upgraded their hpfp noticed a longer than usual crank time on cold starts since replacing the pump? Maybe 50% longer crank before it catches. Most noticeable first thing in the morning. This is on the Supra pump.

[JD11937]

Originally Posted by Sµpreme

Has anyone else who has upgraded their hpfp noticed a longer than usual crank time on cold starts since replacing the pump? Maybe 50% longer crank before it catches. Most noticeable first thing in the morning. This is on the Supra pump.

Are you using E85? I noticed this occasionally happens since I started using it.

[G.Newt]

Originally Posted by Sµpreme

Has anyone else who has upgraded their hpfp noticed a longer than usual crank time on cold starts since replacing the pump? Maybe 50% longer crank before it catches. Most noticeable first thing in the morning. This is on the Supra pump.

Common problem with the N54 boys that run full E85 up here in CO in the winter. They needed tuning adjustments to help solve that issue. Yours doesn't sound as bad so might just need less E or move to a regular OTS map.

[Supr3me]

Originally Posted by JD11937

Are you using E85? I noticed this occasionally happens since I started using it.

Originally Posted by G.Newt

Common problem with the N54 boys that run full E85 up here in CO in the winter. They needed tuning adjustments to help solve that issue. Yours doesn't sound as bad so might just need less E or move to a regular OTS map.

Yep, you guys are right. After I installed the pump I moved to an E50 custom tune from Wedge. It's not a big deal, just curious. I'm assuming it has no real negative impact, maybe a little bit more wear on the starter?

[JD11937]

Originally Posted by Sµpreme

Yep, you guys are right. After I installed the pump I moved to an E50 custom tune from Wedge. It's not a big deal, just curious. I'm assuming it has no real negative impact, maybe a little bit more wear on the starter?

That's what I would assume. My car runs perfectly otherwise, been running an e30 tune for almost a year.

Side note. How was your experience with Wedge? Considering using them.

[Supr3me]

Originally Posted by JD11937

That's what I would assume. My car runs perfectly otherwise, been running an e30 tune for almost a year.

Side note. How was your experience with Wedge? Considering using them.

I'd say good. They definitely aren't same day responders to messages, but they get things done. They sent me the base map a few days after I installed my pump and sent payment. Generally speaking when they send me a revision I post logs the next morning and then I get a rev a few days later, maybe 4 days at the most.
Right now I think they feel like the tune is complete but I've asked a few more questions about what else is possible. I was running the MHD OTS E30 map prior to this E50 Wedge map and I can't say I'm blown away by additional power.
Below is what I sent, been waiting a couple days for a response.


"Feels strong and smooth. No complaints. My only observation is that the power feels a little bit "deep" in the gas pedal, gotta dig deep to get at it. I'm guessing that's probably just a characteristic of this turbo-induction system vs say, a big displacement V8 or a supercharged system. Not sure if tuning could change that.

Virtual Dyno says 450-460 AWD HP based on our latest logs and the data for this vehicle. Based on everything I've seen, stock turbo should be good for a few more HP. Do you think octane or fuel volume is our limiting factor at this point?

I'm likely going to do a turbo upgrade this year. Nothing too crazy, probably a Pure 800.
Trying to decide whether to do the turbo first and see how it does on the Supra pump, or ditch the Supra pump for a Dorch stage 2 hpfp right away.

If you had more fuel volume to work with, do you think the stock turbo has more snort in it?"

I can share additional comments once we mutually agree to close the ticket.

[SC_B5X]

Latest Update: 02/06/2020 @ 12:09AM

- Updated Dorch Engineering HPFP Section (Revised description, personal thoughts, and logs)

- Updated Spool Performance HPFP Section