Link G4 Breakup at WOT

[lglracer]

Hello Everyone,
Im trying to figure out what my issue is with my car. At wide open throttle I am at .85 Lambda on E85. Im getting some really bad break up. Boost level is stock. Breakup is around 4500-5k. I attached a log. Car profile is up to date. any more questions just ask away.

 

[Taylor4ghindman]

On my phone currently so I cant really look at the log. But what is your current setup ?

 

[Vegas Smith]

I can't view the log either but 4-5k is around max torque/boost and in my experience that could be a spark plug gap issue.

 

[Taylor4ghindman]

I can't view the log either but 4-5k is around max torque/boost and in my experience that could be a spark plug gap issue.

That's my thought exactly but at such low boost pressure idk.

 

[Taylor4ghindman]

What's .85 on E85 in afr ? Could be to rich

 

[1990TSIAWDTALON]

From Innovates website:
"Lambda, which is a Greek letter demonstrated by the symbol λ, represents all fuel’s stoichiometric value as 1.00. Lean conditions would represent a value higher than 1.00, and rich conditions are lower. These lean (higher) and rich (lower) values are calculated for the Lambda scale by dividing the observed A/F ratio with that particular fuel’s stoich. For example: a 12.8:1 observed reading with gasoline is divided by 14.7 to produce a .87 Lambda reading."
So it appears to be LEAN to me if it is anywhere close to 12.8:1 at WOT.

 

[Vegas Smith]

That's my thought exactly but at such low boost pressure idk.

Ahh, I didn't see that.

 

[Taylor4ghindman]

Vegas Smith thank you for the education on lambda.
But to the OP what plugs are you using and at what gap?

 

[lglracer]

- Plugs are BPR7 @.22 gap.
- .85lambda is around 12.5 AFR in 91. for E85 thats about 8.3 AFR
- Boost is around 12-14psi

 

[lglracer]

You must be logged in to view this image or video.

Here is a picture of the log. This is right before it starts to break up. my only idea is to switch the COP setup to the factory coil pack and wires and see if that fixes it. Maybe there is something wring with my ARC-2?

 

[Vegas Smith]

I think that's a good idea. My COP was very finicky at first. It was always breaking up and I almost gave up on it until I perfected the length of the spring/boot and really protected my wiring from grounding out.

 

[lglracer]

Did you cut the springs? My springs are not cut. I only cut the boots if I remember correctly.

 

[Vegas Smith]

It depends on which COP plate you use. I used the Frontline-Fab plate that places the coils at a different elevation and that forced me to have to cut the springs. I also used dielectric grease on the ceramic portion of the plugs to reduce grounding.

 

[lglracer]

I'm using a JMF plate. I will have to take it off and see. I don't have any dielectric grease on them. I will have to try that.

 

[motomattx]

If you want to post up your tune I can look at it, are you running modeled fuel setup?

 

[lglracer]

If you want to post up your tune I can look at it, are you running modeled fuel setup?

I will post in a bit. Hopefully it will let me. I had to have @Ludachris setup the site to accept them

 

[motomattx]

Modeled mode or traditional?, sometimes its good to start of as simple as possible, even running Alpha-N if needed.

 

[lglracer]

Fuel is Tradition with Stoich at 9.8AFR

 

[1990TSIAWDTALON]

That is stoich for ethanol but 12.8 at WOT is lean. Can you richen up your fuel at WOT?

 

[lglracer]

That is stoich for ethanol but 12.8 at WOT is lean. Can you richen up your fuel at WOT?

I can add some more fuel to my map and see what happens.