So I drove a Rotrex on Sunday at Buttonwillow... - Page 5 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 12-25-2009, 01:31 PM   #81
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euro spec intake manifolds have the EGR provision aswell AFAIK. My '94 does atleast and I bet the later models too.
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Old 12-25-2009, 10:17 PM   #82
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I know I don't post much here, but I wanted to chime in and say a couple things.

1. damn.
2. will and andrew, congrats. That's really fast. I think my car has probably better throttle response than 99% of turbo cars out there. But there is definately a difference between that and cars with instant throttle response.
3. I've lived outside of California too long. My records are going to fall. Congrats in advance for doing it. I'm pretty sure it will be a combo of the people and cars in this forum...

Matt
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Old 12-25-2009, 10:32 PM   #83
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Quote:
Originally Posted by Matt [exz3owner] View Post
3. I've lived outside of California too long. My records are going to fall. Congrats in advance for doing it. I'm pretty sure it will be a combo of the people and cars in this forum...

Matt
Don't forget me!!!!
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Old 12-26-2009, 08:59 AM   #84
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don't worry, I could never quit you.
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Old 12-26-2009, 11:41 AM   #85
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brb, gotta herd sheep.
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Old 12-27-2009, 03:03 AM   #86
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Quote:
Originally Posted by Ben View Post
That is interesting. I am wondering/assuming that a non-US manifold won't have to be provisioned for the EGR valve, so the the runners will be more equal-length than the turd we got.
Still has EGR
Slightly bigger runners
Slightly more plenum volume
TB has less obstructed flow to plenum
No VICS or VTCS

Might guess it makes a tad more power. Won't know 'til March or so though. Moving to new shop in 4 weeks.

Pic borrowed from MX5Cartalk.com (Australia). Also seen in Japan, UK and EU.

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Old 12-27-2009, 11:32 AM   #87
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I need one of those.
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Old 12-27-2009, 02:02 PM   #88
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For serious, forget my ITB idea, furk.


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With all the drama Savingaids and I have been through on the road to track reliability, it takes a special kind of moron to overlook this supercharger.
Just saw this, hah. I take these words with great appreciation!
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Old 01-06-2010, 10:15 PM   #89
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TPS based boost control is no secret. Virtually all OEM turbos have some road speed or TPS parameter controlling the boost solenoid. To control it very precisely, you really need a full PID control but most DIY'ers do it with a PWM map. ..

It's handy on a turbo set up that will exhibit PTFB (Part Throttle Full Boost). PTFB is kinda fun on a street car where you barely touch the throttle and go blasting through traffic. On the track and autocross course, it's damned annoying since you are trying to control tire slip angle with torque, and it has a mind of it's own. More of an issue on the track where you want to fine tune slip angle on long constant radius turns.
LOL I've been talking about PTFB and the solution since about 2001. This is why I use a 5 psi wastegate can and then use EBC to raise it to 10.

One of the nice things about the AEM is you can use a 3D MAP of target boost, with TPS and RPM as the axes.
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Old 01-06-2010, 10:19 PM   #90
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Same here, I use the boost target per TPS & RPM to raise my 7psi WG spring pressure to 14. Works pretty well on smoothing out the torque feel.
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Old 01-06-2010, 10:27 PM   #91
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You can also run an adjustable pressure relief valve inline to your MBC to control boost onset.

DIY-Boost-Control
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Old 01-06-2010, 10:40 PM   #92
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Quote:
Originally Posted by emilio700 View Post
TPS based boost control is no secret. Virtually all OEM turbos have some road speed or TPS parameter controlling the boost solenoid. To control it very precisely, you really need a full PID control but most DIY'ers do it with a PWM map. ..

It's handy on a turbo set up that will exhibit PTFB (Part Throttle Full Boost). PTFB is kinda fun on a street car where you barely touch the throttle and go blasting through traffic. On the track and autocross course, it's damned annoying since you are trying to control tire slip angle with torque, and it has a mind of it's own. More of an issue on the track where you want to fine tune slip angle on long constant radius turns.
LOL I've been talking about PTFB and the solution since about 2001. This is why I use a 5 psi wastegate can and then use EBC to raise it to 10.

One of the nice things about the AEM is you can use a 3D MAP of target boost, with TPS and RPM as the axes.
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Old 01-07-2010, 03:30 PM   #93
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Quote:
Originally Posted by JasonC SBB View Post
LOL I've been talking about PTFB and the solution since about 2001. This is why I use a 5 psi wastegate can and then use EBC to raise it to 10.

One of the nice things about the AEM is you can use a 3D MAP of target boost, with TPS and RPM as the axes.
Really?
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Old 01-07-2010, 05:02 PM   #94
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Really?
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Old 01-10-2010, 02:40 AM   #95
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William enjoying a little Kraftwerks Rotrex power oversteer coming off the skidpad at Streets of Willow CW today. Oh yeah, we reset the absolute lap record for Miatas at 1:22.830

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Old 01-10-2010, 02:45 AM   #96
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That wing needs bigger strakes/plates, or whatever we're calling them now.
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Old 01-10-2010, 04:29 AM   #97
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Very cool to be seeing times being dropped further and further
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Old 01-10-2010, 06:01 AM   #98
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Last edited by emilio700; 01-13-2010 at 10:35 PM.
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Old 01-10-2010, 11:34 AM   #99
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Quote:
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That wing needs bigger strakes/plates, or whatever we're calling them now.
endplates?

Seriously, why not just mount them to the outsides of the quarter panels at the bumper seam.
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Old 01-10-2010, 12:45 PM   #100
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endplates?

Seriously, why not just mount them to the outsides of the quarter panels at the bumper seam.
that's what I've done before. duct taped to the body, so in theory cause air separation at the rear, like a Prius/Insight.
but had too much rear down force, had to keep cranking up the rear wing. center of the wing is actually pointed up 2 degree in that picture. doing that, side plate will no long line up with the body.

a bit ugly, so I will put back stock end plate.

thanks to you. you helped us fixed start issue. and saw your post on transient throttle, which fixed most of the stuttering issue by noon.

this beat Savington's previous record by 0.1 sec. but to be fair, there was with a chicane repavement 2 months ago, which is worth 0.25 - 0.5 second depending on who you talk to.
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