where is the best place to tap in to get the most accurate reading of manifold pressure?

does it matter as long as it is downstream of the turbo?

any pics or description of your installs would be great!

-d

 

The easiest place is to put a T-Connector where the BOV Vacuum line runs back to the manifold. It has a section of soft hose right on the upper right hand corner of the manifold between two hard sections of line.. It reduced my installation time to a few minutes. Use nylon ties to hold the hose on the T-Connectors so it won't work itself off, it is actually a fairly accurate source for getting boost readings too. Be careful about the diameter of the T Connector, make sure its the same inside diameter. I ran the capillary tubing through a wiring bulkhead (rubber grommet) at the passenger footwell just under the dash

 

I did exactly what MalibuJack did, figuring that if any part had an accurate vacuum connection it would be the BOV.

 

Thanks much guys - should be no sweat with good instructions!

-d

 

i tapped off the same line too... except i routed mine through the rubber boot on the driver side kick panel... a lil bit of a pain in the *** routing it but looks real good now..

 

Don't mean to hijack the thread but I was wondering what boost gauges you guys have settled on getting? I have an Autometer phantom series 30-0-30 in my '95 Talon that works great but I am looking for something that blends a little better with the interior.

Thanks

 

I had an Autometer phantom new in the box on the shelf, so thats the one that got dropped in. Might see if I can find a red bulb to make it blend better at night.

 

I ran my nylon tube thru the steering boot. Not an EVO but yeah just tap into the line off the mani....really easy took not time to splice into the hose. I just used some brass t fittings from the hardware store, with teflon tape around the threading. If you have a little trouble getting the hose into the nipples a good trick is to put a little oil on the nipple itself. Slides right on. Yes as mentioned before always tie off wih some zip ties so the connection doesnt slip off....no diferent than connecting a manual boost controller.

 

I used the autometer 30-0-30 gauge too.. Not a fan of the phantom or c/f series.. I used the standard sport-comp gauge. I was fortunate, the sportcomp gauges come with little 'filters' that fit over the bulb, looks kinda like little condoms for the bulb to change the backlight color.. I used the red one, and at night the color matches the factory perfectly. During the day, its white/yellow lettering.. My installation is on the steering column lined up where it blocks the 'lancer' gauge that has no useful information on it, however I did line it up in such a way where you can see the IC Spray indicator, or the seatbelt indicator lighted. I used a standard autometer mounting cup, kinda looks exactly like the WRX dealer installed boost gauge setup... I did one additional thing, I purchased a Dawes Devices 'A/F' indicator, its really just a small unit that has 4 LEDs that light depending on what voltage is on the O2 sensor. However I discovered that if you want to get accurate readings for what the COMPUTER sees for mixture, you might want to wire it into the computer harness and tap off the O2 sensor line to the computer, and power and ground off the lines running to the computer.. This has two advantages, you can see what the computer sees for voltage, and you don't have to wire it through the firewall. I wouldn't do this with any other manufacturers gauges though.. but I do know that the computer is wired/fused from the battery and grounded the best, and consistent with all the cars electronics (more stable readings apparently) I do recommend using a grounding kit in the car, the voltage to the computer and coming from the sensors does seem to vary a bit depending on where you are connecting things...

 

Cool, thanks for the input, I will check out the sportcomp series.