[AWSAWS]

Hi guys,

running the BMS E85 backend flash and JB4 on map 3 with 80% methanol I'm getting misfires on cylinders 1, 3 and 4.

The plugs are brand new Bosch ZGR6STE2 installed days ago.

Do you think I should be able to run the Bosch plugs or are NGK 5992/95770 (gapped down) the only way to go?

Could be coil packs right? But how to know?

Here's a log if it helps.
https://dl.dropboxusercontent.com/u/...2014_00_20.csv

https://dl.dropboxusercontent.com/u/...2014_01_32.csv

I've been asking about this on N54tech (Titled lpfp, hpfp in logging section)

A possible leaky injector in bank 1 has been speculated. As AFr1 and AFr2 often differ but I don't know how much variation is normal.

[Aragorn30d]

swap the coil packs onto the good cylinders and see if the fault follows them.

[windymissile]

What Meth nozzles are you running?

WM

[AWSAWS]

Dual CM7 nozzles

Avg Ign was dropping to 0 during logs.

[Russbmw]

What makes you suspect the meth system, out of interest?

When does the misfire happen? My misfire that became apparent at 80mph when you put your foot down was attributed to coking up. Walnut blasting treatment 100% fixed it.

[AWSAWS]

Originally Posted by Russbmw

What makes you suspect the meth system, out of interest?

When does the misfire happen? My misfire that became apparent at 80mph when you put your foot down was attributed to coking up. Walnut blasting treatment 100% fixed it.

I've just hit 40k miles, had a JB4 for 15k miles so maybe coking is unlikely?

I'm hoping it's not a leaky injector.

Think I'll have to try NGK plugs first. Then coil packs. Then roll around in agony if it's still happening.

[AWSAWS]

Where would u guys get a gaping tool?
Need 0.56mm

Can see a tool that has 0.5 and 0.6, will that work?

[Aragorn30d]

you need 0.5 and 0.06, or perhaps 0.5, 0.05 and 0.01 :P

[AWSAWS]

Originally Posted by Aragorn30d

you need 0.5 and 0.06, or perhaps 0.5, 0.05 and 0.01 :P

Maybe 3 0.186s?

Reflashed to race flash and have no misfires but seems Fuel Open Loop is the issue. Still investigating.

[windymissile]

Do you get this misfire in any other map? Or is it just while you are running meth? Dual 7's is a lot of extra fuel at 80%. How do the AFR's look?

100% plausible that it's coking too.

WM

[AWSAWS]

Originally Posted by windymissile

Do you get this misfire in any other map? Or is it just while you are running meth? Dual 7's is a lot of extra fuel at 80%. How do the AFR's look?

100% plausible that it's coking too.

WM

Never had a misfire on any map, only with the E85 backend flash. Timing advance is perhaps too aggressive. I haven't checked the specific amount.

Steve on N54 has said the trims are too low sending the AFRs lean, then FOL goes into overdrive sending AFRs too rich, bang, misfires.

The fueling values on the backend flashes do appear that they may be US model oriented and not suited to European cars. Still looking into it.

[jamesmurray]

Are you running any bioethanol? I ask this because with the BMS race and e85 flash the fuel scalar is altered. If you're not running any bioethanol in the tank then use tuner pro to return the fuel scalar back to 1.0. This will correct the trims and return your fuel consumption back to normal. Also running that much meth on those huge jets will compound the over fuelling problem. I see from your logs you're only running a 1psi boost additive? With that kind of meth you could run 50+ additive easily.

James

[AWSAWS]

Originally Posted by jamesmurray

Are you running any bioethanol? I ask this because with the BMS race and e85 flash the fuel scalar is altered. If you're not running any bioethanol in the tank then use tuner pro to return the fuel scalar back to 1.0. This will correct the trims and return your fuel consumption back to normal. Also running that much meth on those huge jets will compound the over fuelling problem. I see from your logs you're only running a 1psi boost additive? With that kind of meth you could run 50+ additive easily.

James

Hey thanks James, you know more about this stuff than me. I wasn't running ethanol at the time, other than the 5% that Tesco momentum would contain.
I'm going to add some tonight for testing.

I kept the meth addative low until I was able to get a run without a misfire.
I have that back at 55 now. I've had it on 65 before the E85 flash.

Thanks for the tip on the fuel scalar. I'm still learning.

[AWSAWS]

I had said on N54 that I wasn't running E. I was still advised that the E85 flash with 80% meth would be ok.

[jamesmurray]

I found that the trims were going negative when running the increased fuel scalar. Plus I never got much better than 20mpg on the race flash. Resetting the scalar back to stock sorted it all out. Is the e85 flash not a bit extreme for over here? The ignition timing and fuelling gets set a lot higher. I've run up to 100% meth on the race flash without issue

James

[AWSAWS]

Originally Posted by jamesmurray

I found that the trims were going negative when running the increased fuel scalar. Plus I never got much better than 20mpg on the race flash. Resetting the scalar back to stock sorted it all out. Is the e85 flash not a bit extreme for over here? The ignition timing and fuelling gets set a lot higher. I've run up to 100% meth on the race flash without issue

James

Yeah I'm interested to test and see how it goes.

I've got more ethanol arriving today to test. I want to give this a go at Santa Pod to see what's the best time and trap speed I can get.

On race flash I haven't seen any mpg change on my car personally. I get 23mpg with urban driving, up around 30 when motorways are involved and that's at a good pace. Let's just say not at speeds considered economical

Got 39mpg on that 50mph speed check zone:



29 MPG on last run to Santa Pod.



Had the race flash installed but cylinder 1 was screwed. Misfiring. Old plugs had 22k miles. Timing couldn't get far off 0 after something like 2nd gear.

The trims are really low. I'm just gad the fuel pumps aren't looking weak at this stage.