Idle surge after Stillen supercharger install

NissanTracker

Went to Thompson speedway yesterday for a HSDE. I have to admit that I had 0 optimism going into the event. I brought basically my entire workshop with me.. extra belts, pulley, fuel pump, etc... Car handled very well and the charger just took me by surprise. Zero issues (minus the already known idle and cylinder misfire CELs). Power was great, which just gives the nismo an entirely different purpose on the track.

Update on the idle Info:
1) Decided to replace the throttle bodies. I got a set from a 370z with only 30K miles for $115.00. Cheap enough to replace. They will be here Thursday, so I'll install them on the weekend and go through the idle relearn procedure and post.

2) Found out that the P0300 Multi-cylinder misfire only occurs at startup on cold mornings. I'll replace the TB's first and revisit this.

3) Gas tank level reporting is off. Car gas meter showed that I had a quarter tank of gas and I had issues starting the car. I was very careful taking the fuel assembly out of the tank and installing it back.

EDIT:

On item 2 above, it may also be the TB. That p0507 is barking at me all the time due to ISC. If the T.B. is screwed up, at startup... it would most likely misfire.

Max abbas

check the maf harness extension as well as TB extension
most people who run the kit extend the harness itself instead of using the extension harness that comes with it which proved to be problematic.

NissanTracker

I actually have their new revised harnesses.

I'm trying to fab up a new shield for the filter. It has been idling fine, but when the fans kick on... that is where the idle surge occurs.

TopgunZ

This is most likely it.

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imazman

I have an 11' 370z nismo with installed Stillen SC and oil cooler. I bought the canned tune from Stillen and for what it's worth I too have an occasional P0300 pop up. I want to make a few mods and then I hope to get it to a tuner soon which will hopefully fix the problems I'm having with the shitty Stillen SC kit.

NissanTracker

I ordered some material for a shield... I'm going to make an attempt this week to get it done. I'll switch out the TB's as well. I just haven't had the time.

My last resort will be back to the tuners, but this will wait until the spring. I'm considering TopGunz A-A kit and would rather just put that on and re-tune. I have a true dual exhaust as well to install.

Having the MAFs so close to the filters is just a terrible design. You normally want them closer to the T.B's. Especially when there is a difference in Temperature. Maf's are reading directly after the filters... then goes through the charger and maybe not significant, the air temp/density is not the same. I have a feeling this initial design has something to do with their CARB certification.... as well as the crappy in house tune

I talked with someone that mentioned that this Stillen S.C. kit, if installed by a SAE certified tech at Nissan, will not void the factory warranty. Have to use the Stillen tune to stay CARB compliant