# B18C Build Troubleshooting

**URL:** <https://forums.speedlife.net/t/b18c-build-troubleshooting/196698>\
**Category:** PittSpeed Automotive\
**Created:** [April 9, 2008, 5:37am UTC](https://forums.speedlife.net/t/b18c-build-troubleshooting/196698 "2008-04-09T05:37:33Z")\
**Posts on this page:** 1\
**Showing post:** 32

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**Author:** ![dyingwish](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/dyingwish/32/6041_2.png) [@dyingwish](https://forums.speedlife.net/u/dyingwish)\
**Post date:** [April 10, 2008, 9:06am UTC](https://forums.speedlife.net/t/b18c-build-troubleshooting/196698/32 "2008-04-10T09:06:08Z")

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> [@Post up pics of your best wreck.](https://forums.speedlife.net/t/post-up-pics-of-your-best-wreck/35879/8):
>
> Where did you T for the MAP?

It’s not T’d actually. The stock MAP sensor is normally mounted on the throttle body, where vacuum input is accessed via a small port on the side of the throttle body.

I mounted the MAP sensor on the firewall (port facing up) and ran a short (3-4 in long) line directly into the vacuum manifold. Datalog shows that readings are within the OEM spec 0-30inHg.

The vacuum routing is like this:

Manifold has 5 ports and an exit port

Port 1 - MAP sensor  
Port 2 - to runners 3 and 4  
Port 3 - plugged, not in use  
Port 4 - to runners 1 and 2  
Port 5 - to FPR hose fitting  
exit port - to brake booster checkvalve

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