Miata Turbo Forum - Boost cars, acquire cats.

- MEGAsquirt (https://www.miataturbo.net/megasquirt-18/)

- - Megasquirt Boostcontroler (https://www.miataturbo.net/megasquirt-18/megasquirt-boostcontroler-44696/)

Sorry I thought your previous statement meant it wasn't broken! :(

no, I was saying if it weren't brokenz, i'd probably go build the second hall circuit.

Why is your car always borken? :-P Don't feel bad, I'm building a new motor because I'm just... suspicious about mine. And because I like horsepowerz.

Quote:

Originally Posted by stranges12712 (Post 547595)

so i just went out and bought a Forge MBC. This may be a dumb question but could i route a vac line all the way inside by the dash and put my mbc beside or under the dash and run the other vac line back to the turbo? Would that fuck up the boost settings?

Forge, wow, fancy. I'm a big fan of the Cheap. Just ask any girl I take out. :-) That said, much better than running the lines in the cab, which will give you overshoot and poor control.... Run a long cable into the cab, the kind you can twist, like a speed cable. I've heard of people do this and they are happy about it.

Another option, JoeP does this - he puts a couple solenoids in the cab with an MBC each, and energizes one or the other depending what boost he wants.

Personally, I just tune for high boost and alter boost with the throttle.

Quote:

Originally Posted by AbeFM (Post 547970)

Why is your car always borken? :-P Don't feel bad, I'm building a new motor because I'm just... suspicious about mine. And because I like horsepowerz.

Forge, wow, fancy. I'm a big fan of the Cheap. Just ask any girl I take out. :-) That said, much better than running the lines in the cab, which will give you overshoot and poor control.... Run a long cable into the cab, the kind you can twist, like a speed cable. I've heard of people do this and they are happy about it.

Another option, JoeP does this - he puts a couple solenoids in the cab with an MBC each, and energizes one or the other depending what boost he wants.

Personally, I just tune for high boost and alter boost with the throttle.

LMAO. Well Forge was the cheapest one if you can believe that, buddy owns a performance store. I think it was 80$...meh. To much work to do all that. Il just keep her at 30lbs, just try to keep my foot light ;). I like my EBC but she went all fucky last year i will try to fix her at the dyno this year if not il just the forge, alot easier to operate but you just have to turn it up or down and usually when you have the boost down is when some tool wants to race.

my car isnt, my 3 day old MS-III CPU is.

interesting read on the boost controller likes/dislikes. I need to learn more about MS

Oh, the ones you build from McMaster parts are like $15-30 depending if you throw a light weight ball in there, etc.

30 psi is quite a bit! But yeah, control it with the foot, or a single solenoid and two MBC's. Won't cost a hell of a lot.

You could also go the "calibrated leak" route - then your solenoid can be much smaller. Put a small orfice (0.020"?) on a T with a solenoid, and that leak will let the wastegate respond slower and give more boost.

If you are auto-x or tracking I'd say controlling boost with your foot can be interesting. My datalogs show me doing most of a good auto-x run with small spikes to 100 % TPS and much of the acceleration during runs is around 60 % TPS with 10-11 PSI in 2nd gear. So anything above 50% basically = full boost.

It's a testament to what a bad driver I am, but I find turbo lag the only way to get traction in an autocross. :-)

Quote:

Originally Posted by Braineack (Post 548266)

my car isnt, my 3 day old MS-III CPU is.

Have you gotten the hardware back together yet so I can load the bootloader for you?

Also, based on your post on the msextra forum, it seems like you're having better luck with the PID boost control on ms2.

Ken