alliance12364

I'm going to be putting a 383 stroker and a vortech t trim kit in my 95z. Ijust placed an order for a 24x kit also and they want to know if I'm running a 2 or 3 bar map. Know my questions are,... Do I have to run a # bar map? Where would I purchace one? And what advantages would I have by running one? I'm a noob so excuse me if these questions are dumb lol

Kevin Blown 95 TA

You don't have one now. you have a 1 bar MAP sensor. You can buy GM 2 or 3 bar sensors, but you would have to do some fancy programming to get it to work - there are a few threads on this topic. Advantage would be a boost referenced SD tune, disadvantage would be trying to get the tune to work, some loss of resolution, and ditching the MAF tune. FYI, the boost retard ignition amps use a separate 2 bar sensor to take out the timing in boost.

97WS6SCharged

If you're going the 24x route the LS1 PCM can be loaded up with a 2 bar OS which is a ton easier than converting an LT1 PCM to 2 bar. Just go down to your local Napa or whatnot and ask them for a MAP sensor for a GMC Syclone or Typhoon. It will bolt right in place of your stock LT1 MAP.

DirtyDaveW

I just switched to the 2 bar MAP sensor (ebay sourced for about $42 shipped and came with the male plug too, which I didn't need. The sensor matched my factory harness). The local auto parts place wanted $8x.xx for the same sensor!
Part numbers:
2 Bar:
GM part # 16009886
Wells part # SU-129
standard part # AS-4
91-93 GMC Syclone & Typhoon 4.3 turbo
87-90 Pontiac Sunbird Turbo 2.0
84-86 Sunbird (actually any J-car) turbo 1.8
886, 012, 539, 609, 701



Like the guys said, with the 24x setup and HP tuners software, you can probably get going quickly. I still have the LT1 PCM and I'm tuning it now. Lots of testing and reflashing going on to get it right, lol... Best of luck!

alliance12364

Thanks for all the info guys! I'm gona be between 15-20lbs boost so I would need a 3 bar. Anybody got a part # for that one?

DirtyDaveW

Just did a quick google (GM 3 bar map sensor)
This one is inexpensive...
GM 3 bar Map Sensor Kit TURBO 3bar 12223861 on eBay!

If you're running the LT1 OBDI or OBDII PCM, most guys here think/feel that with the 3 bar map sensor, you'll lose too much resolution/definition for the fueling.