Just got the Joe P manual boost controller

[92 Celica All-Trac]

I got the Joe P MBC today and it's so much better than the bleeder type I had. I get a rock steady 15 psi in 2nd, and 16 psi in 3rd, 4th, and 5th. The boost comes on a little quicker than my old one also. I definately recommend it to anyone. $50 shipped from http://www.boostcontroller.com

[Edited by 92 Celica All-Trac on 12-04-2000 at 04:19 PM]

[nukefission]

What's the difference between the "bleeder" type of MBC and other types? Also, why is it expected that you have slightly different boost readings in each successive gear? I have Extreme's MBC and it doesn't do this. It stays where I set it no matter what gear I'm accelerating in.

[92 Celica All-Trac]

Well the more load on the engine the more boost is gonna be made typically. That's why 1st never has as much boost as the other gears unless you're not running any more boost than you can get in 1st. How much are you running? I don't see how you can get the same amount of boost in every gear...it's physics more than anything.

Oh yeah, you can see the difference between a bleeder and a ball & spring type (Joe P, Hallman, Extreme) here: http://www.gtfour.com/article.asp?ID=AAAAEI

[nukefission]

Thanks for the info.
I have my MBC set to about 14.5 psi. What you say about engine load and boost makes sense, however in practice I don't see it happening. From 1st gear all the way to 5th gear, the boost shoots up to 14.5 and stays put (unless I go beyond 6500 rpms, then it'll start to fall off a bit -- still have a pretty stock setup).

[TheHondaKiller]

The less boost leaks you have, the more your boost will "spike", if it hits and holds rock steady with a ball and spring then trails, you have some boost leaks, especially at 14.5 psi. The bleeders suck, here's why: They are about the same price as a ball & spring, AND they just bleed the signal so the wastegate starts to open up well before full boost because it's just a partially bled pressure siganl. Now the ball and spring holds all signal until the spring is released then sends the signal to the wastegate to open it, thus you get faster spoolup and better low-mid range power with it.
Mike "V8Killer"
The fastest stock turbo DSM in Iowa