Fuel cut back?

[ForceFed86]

So is fuel cut completly out of the picture with jakal? Recently since modifying the Wg and turbo porting I'm seeing 37.5 or or so manifold pressure on initial spike.

 This is not a gradual break up similar to spark blow-out etc... It's almost like a hard fuel shutoff. Only happens if boost ramps up over 35psi. I'm not showing any knock or seeing any signs of detonation on the plugs.

Using the Aem 3.5 bar sensor. (I know hak I know!)

I honsetly am stumped. Anyone have any ideas? I'm sure this e316g doesn't do a damn bit of good at 35+psi. But it seems to allow me to carry the boost higer farther into the rpm band. Ie with a 30psi spike I'll hold 26psi to redline. With a 37lb spike I'll hold 27-28 to redline. (6200)

[hakcenter]

Fuel cut is completely removed, and no-op'd. From d576 up to like d5a1

Spark blow out usually sounds like burping.. not sure what your issue is. Maybe your fuel pump can't keep up ?

[ForceFed86]

Fuel pump is something I could look into. Although the AFR's don't indicate a lean condition at the breakup point. DC on the injectors is at 110% or so but AFR's are in around 10.9, and lean back out to mid 11's after the spike.  Seems like right at 36 psi it hits a fuel cut. Feels just like the OEM fuel cut. That also happens to be the max cell for my map sensor so I was just trying to tie the two together.  I'll try to adjust the gate to keep it to 34-35 and under and look into the fuel pump i suppose, maybe check the filter while I'm at it.

Thanks!

 

[hakcenter]

Is your map sensor in the plenum or on the throttle body ?

[ForceFed86]

Plenum.  Installed it on a “T”  right at the brake vacuum port threaded directly into the manifold. Might be a bad idea with the added heat to the sensor. Might have to change that with a short vac run. 

[hakcenter]

Your logs show a steady map signal when you hit this crap ?

[ForceFed86]

Yup steady  to peak boost always breaks up right at that point. AFR is steady as well. I always lift immediately at that point so I do get a lean blip, but I’m pretty sure that’s from the lift. Tested my fuel and it was a little low at around 70% ethanol. Drained my tank and filled up with some better 85% last night, no change. I have also tried it in 100+ degree heat and 70* temps this morning on the way to work, no change.   

[onewhiteguy]

i have had the same issue you are talking about ForceFed, turned out i WAS in fact blowing the spark out at around  35psi, (HX40) logs looked good, no knock or lean conditions...

i ended up getting a set of BR9ES plugs and gaped them down to .025, the car pulled smooth to redline after that, 8500.. i think the NON-Protruding plugs help with knock and spark blowout.

11.0 seems rich for e85 to me, i try to keep my AFR's up in the 12.0 range that is where my car likes it, BUT every car is different.

just a suggestion, not sure if this is what your issue is but i thought i would through that in there to ponder.....

[ForceFed86]

i have had the same issue you are talking about ForceFed, turned out i WAS in fact blowing the spark out at around  35psi, (HX40) logs looked good, no knock or lean conditions...

i ended up getting a set of BR9ES plugs and gaped them down to .025, the car pulled smooth to redline after that, 8500.. i think the NON-Protruding plugs help with knock and spark blowout.

11.0 seems rich for e85 to me, i try to keep my AFR's up in the 12.0 range that is where my car likes it, BUT every car is different.

just a suggestion, not sure if this is what your issue is but i thought i would through that in there to ponder.....

Appreciate the input. I'm running br9es plugs as well. Gapped at .024. I tried knocking the gap down to .018 and up to .028. Made no difference.

Thanks though! 

[onewhiteguy]

Ok, well I am stumped too.. If your not going lean per your logs from lack of fuel, or rich from spark blowout, then I don't know... What all have you change with your setup?  I assume it didn't have this issue before the WG mod and turbo porting? Have you tried just letting the car act up while logging and just let it go for a bit instead of lifting when it acts up? Maybe your not letting it log enough before you lift to get a good idea of what it is doing? I have had to just bit the bullet and keep on the go pedal to get a good log to find out what the car was doing, I know it's a natural reaction to lift when it's not right, but sometimes you have to get a good log, in order to pin point the issue...

If you have or can get a good log, could you post it so I can take a look?

[Mikesteph46]

I know you might have looked at it but what about your fuel pressure regulator? How many fuel pumps you running?
Or maybe I don't understand the issue. Is the fuel cutting out completely or not getting enough feed to the injectors? It could maybe be your injectors they might be clogged or something I been thinking about this all day an even asked a few of my DSM friends an hell we thought the same shit! Are you running SD?

[ForceFed86]

Well its boost related for sure. I removed the huge spring from my actuator and replaced it with a lighter one. Seems as long as I stay under 36psi I don't have issues?

 I also changed to a new set of plugs gapped at .020. Double checked all my fuel pump wiring and voltages. Spikes to 35-36 and Pulls a solid 30 psi up to 6500 as it sits. Think I'll just call that good until the Hx35 arrives. Also I'm running all of this through 2.5" crush bent piping.  I've got a cutout on order now. Straight shot down and out of the cutout should free up some ponies/boost. Hoping to get a solid 120+ (119 previous best) out of the 16g before I swap it out.

Thanks all...