merlin.oz

Its probably intake reversion thru the MAF on lift-off.
Check your logs of Airflow HZ to see if you have correlation with the enrichment.
You will likely also see a short duration rise in intake air temps, which is the giveaway reversion indicator.

ReidFletcher

iTrader: (1)

Hmmm did not think of that. What would you suggest to eliminate this issue? Switch to SD? Revolver cams causing this?

ReidFletcher

iTrader: (1)

i do also have my intake cam advanced 5* for more vacuum. When revolvers were made there was a handful of sets machined lobe center incorrectly. Some were as bad as being 21* off. Most reported ~5* off center, but sort of irrelevant issue. Would returning to 0* help?

mines5

There is only 1 way to find out.. 0/0 the cams.

ReidFletcher

iTrader: (1)

yup I pulled the intake back to 0. Gunna go drive the car this weekend and see what I can figure out. If anything. Recreating the issue is tough in Reno. But as soon as I get to Thunderhill it's impressively bad. Aha

Woild converting to SD be in my favor for eliminating this issue?

mines5

I hope the issue went away.

If not, try flashing a bone stock 9417 3D SD rom or a 9653 3d sd.

mines5

Hey Reid ,

did you resolve the issue ?

ReidFletcher

iTrader: (1)

I haven't gotten a chance to get back out on the track but it seems to be better since bringing the cam degree back to 0*. I think the issue was indeed the aggressive overlap of the cams causing intake reversion.

mines5

Its good to know that the problem does not exist anymore. (Y)

Evo_Jay

iTrader: (17)

Personally I woudl have stayed with 9417. I find it a way better ROM then 9653.

mines5

Hello jay.
Can you please share why you prefer 9417 over 9653 ?

ReidFletcher

iTrader: (1)

There really isn't much different. I just tried it to diagnose a possible corrupt file. But I've been on 9417 for years so I just stayed with that rom.

mines5

All cars here are JDM, i have tried both 9417 and 9653 with different mods . On 9653 car feels lighter and throttle response is crisp.

BTW thanks for updating the thread , may be some one can benefit from your experience.

supak1111

Im on 9417 too and no cams yet same issue. Some ppl have suggested that it could be a lighter aftermarket flywheel issue, I'm not sure what I have in my car so I can't say

I've been trying to fix this for a while now. One issue that I've fixes that made this worse was my r2d2 BOV that is still recirculated wasn't working smoothly all the time. I found water and rust inside the piston. Since I've taken it apart, cleaned it and greased it up issue is less frequent but not gone though...


.

mines5

Convert to sd and enjoy my friend.