My question is, would a nearly stock LNF need a pump upgrade if say they are only looking for 310-320WHP?

(I am guessing less WHP demand => less fuel damand => less fuel pressure needed) Just curious if this can be acheived with the TF tune. I am willing to guinnea pig for this also

 

This I need to experiment with some more. I drove my car about 100 miles yesterday, but did pop the P0087 code after a 1st, 2nd, 3rd, NLS to 4th pull. My car is bone stock other than the tune. I wasn't monitoring fuel rail pressure stuff so I don't know exactly what happened, but I've seen other LNF cars (mostly roadsters doing 5th gear pulls) hit P0087 even on gasoline.

 

Just out of curiousity were you about or below a quarter tank of gas? I noticed that when i am below 1/4 tank of gas and go WOT i pop P0087 quite regularly but if i am above 1/2 tank of gas it never happens. It seems as though fuel pressure is not as strong under 1/4 tank of gas.

 

My coupe has hit it before with the 50/50 mix. Again, I am willing to try it out if you wanna send a tune my way.

 

No, I had filled up 100% on E85. By then I'd been through about 1/4 tank, so I had around 3/4 left.

The P0087 can be caused by several things. It basically means the actual fuel rail pressure is too far below the commanded rail pressure. This could be due to low pressure pump supply issues, clogged lines, or simply maxxing out the high pressure pump / system as ZZP said. I didn't have a chance to investigate the specific cause on mine, yet.

 

When I swapped my Saab over to E85 my fuel filter got clogged..... mainly because it cleans all the crap out.

 

The question I've been mulling over is this: is it better to keep the rail pressure lower and advance the injection timing (and lengthen the pulsewidth) or to keep the rail pressure cranked up? I guess the volume of fuel doesn't change from one scenario to the other, but perhaps the workload on the high pressure pump may be lower if it has more time to inject the fuel rather than trying to make it happen really quickly, at really high pressure.

EDIT: I suppose the best thing to do is to try both and see which results in a more stable fuel rail pressure...

 

Weird, if I was running HPT or EFILive I would at least entertain the idea of working together for the same goals. If I were you I probably would have tried to work a deal with them also.

Your strengths are obviously more on the software end since that's your background, I would think you would prefer to concentrate on doing that more than actual tuning. As I'm sure you are well aware of, tuning comes with liabilities and constant support that can be a pain in the #ss. With you providing the software and an entire community of tuners out there experimenting with the tables we'd all progress WAY faster. I know I for one have figured out stuff in the EFILive and HPT software that the guys that made it didn't know or understand what it could mean or how it could be used. You've been a huge help to the LNF community, as HPT has been and now (maybe) EFI will be too. The possibilities of progressing further would be huge if all the LNF tuners were looking at what you see on your computer.

Just a few thoughts, thanks for your reply and acknowledgement, I appreciate that.

 

This is really good news for big turbo guys if the fuel pumps can support it.

 

 

You definitely don't want to spray fuel while the exhaust valve is open, however it was my understanding of turbo DISI motors that under positive pressure you wanted to keep the intake valve open and continue spraying fuel into the incoming air even when in the compression stroke. Of course the amount of time into the compression stroke that you can do this is based on the amount of air being pushed by the turbo so at higher boost you can contiue to push air and spray fuel longer into the compression stroke.

As for being able to lengthen the injection window, this is good news for bigger turbo setups as well as those wanting to run E85. It is a shame that we can't have an easy one stop shop for all of our LNF tuning needs, though the Trifecta + HPT is close to accomplishing that.

 

Anyone thought about an inline pump? This might take the strain off the low pressure. I am sure someone had to think about this, just seeing if its been tested.

Amazon.com: Pierburg Fuel Pump: Automotive

 

vince what kind of hp gains are we looking at here.
all these hondas down here are running around using e85 as race gas, glad to know we finally have the option
i don't want to thread jack but could we see trifecta evolving the ezflash cable to something like this.with all the maps, and diff fuels you can tune and offer i think a simple handheld device with a couple different tunes on it would work out better then carrying a laptop around everywhere.
just a thought.

http://image.automotive.com/f/tech/8..._held_unit.jpg

 

or a trifecta droid app would be pretty sweet

 

oh droid app ^_^

 

FWIW our local stations in Upstate, SC are all at full 85% ethanol now... i honestly dont think they ever switched the E78 this year and we never get down to E70... i only know about us having true E85 because my friend is building a race car and wanted to make damn sure before tuning it...

 

hmm, that's the second time this week I've heard this. ;-)

 

I'm to poor for one of those nice fancy phones, I'm still rolling with the I-touch

Since your no longer with Microsoft, that wouldn't be a problem would it?

 

iPhone app would also be nice

 

good news im hoping i can run 100% e85 on the 5857 turbo

 

Fixed

 

Dont think we will be able to get there still. That is ALOT more fuel need than just on the stock turbo. But this will work very well for say race gas and a big turbo.

 

iphone is 2 **** with its apps , so unless the phone is jailbreak =p

 

Jailbroken with Greenpoison

 

We are all going to Have to because HPT is a damn joke ...


Good thing my buddy lives around here with Dealer cable

You really need both IMO ....