Decipher my logs please

[mgrych]

I have about 10 data logs from my JB4.. I need someone or some people to look at them..

All my pulls in 3rd I think are fine, but the long pulls in 4th at high speed WOT, I get the half engine light with the fuel pressure code 29F2, and F.I pressure sensor code 29E2....

I have them listed on my posts below.

Thank you for the assistance

[135Pats]

Use datazap and upload your logs to that, then just paste the link here. Easy.

[mgrych]

Ok here they are..

My 3rd gear pulls.. everything seemed ok while driving.. http://www.datazap.me/u/mgrych/3rd-g...log=0&data=1-4

My 4th gear pulls that ended with the car throwing the half engine light, and codes 29E2 and 29F2.. fuel pressure and fuel injector fuel pressure sensor..

http://www.datazap.me/u/mgrych/4th-g...log=0&data=1-4

[mgrych]

here's a 3rd gear pull where there is a weird dip in the IgnAdv early on right after starting WOT

http://www.datazap.me/u/mgrych/3rd-g...data=1-5-10-11

[mgrych]

Any assistance would be appreciated, it appears the HPFP drops real hard right before I let off.. and the LPFP has some pretty big spikes and drops too.. maybe an inline is in need?

[135Pats]

Originally Posted by mgrych

Any assistance would be appreciated, it appears the HPFP drops real hard right before I let off.. and the LPFP has some pretty big spikes and drops too.. maybe an inline is in need?

How much ethanol are you running? I really, really don't like how long JB can take to get AFRs in a fatter spot, but that's just me.

How does JB4 scale LPFP PSI? I dont know, to be honest.

[mgrych]

Im running about E35-E40

I can't answer your question about the scaling of the LPFP though

[135Pats]

Originally Posted by mgrych

Im running about E35-E40

I can't answer your question about the scaling of the LPFP though

Send the logs to Terry he'll steer you right. I don't want to give you advice w/out knowing how JB scales fuel pressure

[SteveAZ]

LPFP scale for JB4 is 10:1

The LPFP sensor is noisy but the LPFP and HPFP pressures are fine. You're using an old interface and I can't tell what your OL is at and why your LPFPs are on oil temp. I'm guessing it's too high and that is why the DME shut you down.

Update your interface and log again or Terry may be able to tell you despite the out of date software.

[mgrych]

I switched over to the Mac OSX version and it has other parameters now including FP L and FP H.. Here is one after I switched, unfortunately it was in 3rd and wasn't one that through the code

http://www.datazap.me/u/mgrych/1?log...a=1-5-10-11-17

[mgrych]

Originally Posted by SteveAZ

LPFP scale for JB4 is 10:1

The LPFP sensor is noisy but the LPFP and HPFP pressures are fine. You're using an old interface and I can't tell what your OL is at and why your LPFPs are on oil temp. I'm guessing it's too high and that is why the DME shut you down.

Update your interface and log again or Terry may be able to tell you despite the out of date software.

OL?

[135Pats]

Originally Posted by mgrych

OL?

OL=Open Loop

The JB4 has fairly limited control over fueling and largely just tries to get it within a range where the DME can keep it happy via adding in or pulling out trim.


In all honesty i'd just reach out to Terry with your logs. He's very helpful with this type of stuff.

[SteveAZ]

As suspected, your OL is 95 and a lot of cars don't care for that much as it can cause this exact issue.

You've pretty much maxed out your ethanol content and are going to need to do a flash if you plan to run higher concentrations.

Thus far your HPFP is okay but in that latest log your LPFP is starting to show signs that it's nearing its limit.

Your FF value is pretty low and is probably in the process of learning up as your Avg. Ign. looks good.

But by all means...send these to Terry as he is the expert in all things JB4

[mgrych]

Originally Posted by SteveAZ

As suspected, your OL is 95 and a lot of cars don't care for that much as it can cause this exact issue.

You've pretty much maxed out your ethanol content and are going to need to do a flash if you plan to run higher concentrations.

Thus far your HPFP is okay but in that latest log your LPFP is starting to show signs that it's nearing its limit.

Your FF value is pretty low and is probably in the process of learning up as your Avg. Ign. looks good.

But by all means...send these to Terry as he is the expert in all things JB4

Thanks guys,
unfortunately I tried reaching out but he doesn't advise on logs anymore as stated in his email back to me.

Would you suggest lowering the OL setting on the JB4?
Maybe the inline pump and flash added ?

[135Pats]

Originally Posted by mgrych

Thanks guys,
unfortunately I tried reaching out but he doesn't advise on logs anymore as stated in his email back to me.

Would you suggest lowering the OL setting on the JB4?
Maybe the inline pump and flash added ?

The best/ideal solution is to properly supply more fuel via a DME flash to adjust scalars, and an inline LPFP courtesy of Steve (don't even bother with other options, i've been there and done that....)

Anything short of that is a bandaid. You need more fuel than a piggyback can provide.

[mgrych]

That's what I'm thinking but I hate jumping the gun on anything if there's other issues we're not seeing..

Having a heck of a time getting people to look at it

[SteveAZ]

Sorry...yesterday was super busy.

With your OL being 95 and your trims virtually max'd...that's gonna be a problem. Add to that the fact that your FF value is still pretty low and you have more potential to be extracted...you're going to run in to even more problems. To get your fueling under control you're going to need a flash.

Your LPFP is definitely struggling in that last log but as I said it didn't take your HPFP with it and when your LPFP was at it's lowest point your HPFP was still doing fine. However, if you start demanding much more from it or continue to demand this much of it, it's only a matter of time.

As of now if that were my car I would either reduce my mix or flash. Second on the list would be an LPFP upgrade, especially if you want to sustain that level of ethanol or potentially run more.

Sorry, this is pretty much what I said before...but based on what you're provided, it's my honest opinion and I don't know what else to tell ya.

Oh...and thanks 135Pats

[mgrych]

Thanks for your input,
Both of you, I really do appreciate it..

I'll start hunting for a BT cable as you already have the inline upgrade on your site.
Quick question but with the flash and the inline, what's the most alcohol I can run? I believe I went over this with someone once before but would like to hear from you.

Thanks

[SteveAZ]

Provided everything is healthy, E60 is the sweet spot for power and the fuel system with proper tuning. From all indications in your logs....you should be fine with that.

Others run more for various reasons but beyond E60...you need to be on top of things.

[mgrych]

Thanks, and assuming map 7 ?

[SteveAZ]

E60 is sufficient for map 7.

When I ran JB4 w/flash I would run E60 and use map 2 as my DD and map 7 when I wanted the extra power.

[jturboawd]

I recommend moving over to the flash side of things. Also it looks like your iat constantly increase significantly. Which fmic are you using?