Thread: Anyone run with out a MAP sensor?

Just curious as I have been having issues with my car since I got rid of the M90 block off and moved to a ported LIM, L36 UIM, and ported TB. The car starts to build boost, but for some reason hits a wall at 4500ish RPM's. If I give it a some gas build some boost then let off the car dies. If I drive the car normally and ease up to speed it drives fine and doesn't die.

Video for reference:
Boost cutoff? - YouTube

I have a intercooled CT kit with LT1 MAF

What kind of vacuum lines are you using or have you changed to?

Wasn't it an L67 to begin with?

And you added an L36 LIM?

What did you do about the injector bosses?

Soo... are you running a MAP sensor? 1 bar or 2 bar?

Either run an L36 bin file with a 1 bar MAP sensor or run an L67 bin file with a 2 bar map sensor.
You can use a 2bar MAP sensor from a 2004+ GTP on the L36 UIM.

Originally Posted by FoSHO99

What kind of vacuum lines are you using or have you changed to?

Mix of silicon and rubber

Originally Posted by Wsmccoy

I'm running my L26 turbo with no map sensor and didn't have any problems except for a code. Couldn't you try and put a tee in off the vacuum line and run a hose off the tee to the map sensor?

tried going directly to UIM and to vac block with same results.

Originally Posted by bluegtp91

Wasn't it an L67 to begin with?

And you added an L36 LIM?

What did you do about the injector bosses?

Yes was L67 and replaced the M90 case with a ported L26 LIM. Injector bosses tig welded closed and vac gauge is reading -18 at idle.

Originally Posted by Tengis

Soo... are you running a MAP sensor? 1 bar or 2 bar?

Either run an L36 bin file with a 1 bar MAP sensor or run an L67 bin file with a 2 bar map sensor.
You can use a 2bar MAP sensor from a 2004+ GTP on the L36 UIM.

Running L67 MAP





I also have an enhanced AFC that I might start playing with.

Originally Posted by alsaiyadal

Also r u running a gt PCM file or a gtp PCM file. Cuz of u don't have a gtp operating systems "osid" the map sensor will not read boost

L67 PCM shelf "tuned" for a turbo.