Miata Turbo Forum - Boost cars, acquire cats.

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-   -   So I drove a Rotrex on Sunday at Buttonwillow... (https://www.miataturbo.net/general-miata-chat-9/so-i-drove-rotrex-sunday-buttonwillow-42314/)

Oscar 12-25-2009 12:31 PM

euro spec intake manifolds have the EGR provision aswell AFAIK. My '94 does atleast and I bet the later models too.

Matt [exz3owner] 12-25-2009 09:17 PM

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

hustler 12-25-2009 09:32 PM


Originally Posted by Matt [exz3owner] (Post 500249)
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!!!! :cry:

Matt [exz3owner] 12-26-2009 07:59 AM

don't worry, I could never quit you.

hustler 12-26-2009 10:41 AM

brb, gotta herd sheep.

emilio700 12-27-2009 02:03 AM


Originally Posted by Ben (Post 500166)
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.

http://www.mx5.com.au/nsw/images/engine.jpg

hustler 12-27-2009 10:32 AM

I need one of those.

flier129 12-27-2009 01:02 PM

For serious, forget my ITB idea, furk.



Originally Posted by hustler (Post 499996)
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!

JasonC SBB 01-06-2010 09:15 PM


Originally Posted by emilio700 (Post 499994)
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.

TurboTim 01-06-2010 09:19 PM

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.

I am Jack's NA 01-06-2010 09:27 PM

You can also run an adjustable pressure relief valve inline to your MBC to control boost onset.

DIY-Boost-Control

JasonC SBB 01-06-2010 09:40 PM


Originally Posted by emilio700 (Post 499994)
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.

TurboTim 01-07-2010 02:30 PM


Originally Posted by JasonC SBB (Post 504983)
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?

gospeed81 01-07-2010 04:02 PM

1 Attachment(s)

Originally Posted by TurboTim (Post 505302)
Really?

Attachment 201380

emilio700 01-10-2010 01:40 AM

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

http://949racing.com/kraftwerks/William_SOW_0110a.jpg

hustler 01-10-2010 01:45 AM

That wing needs bigger strakes/plates, or whatever we're calling them now.

ThePass 01-10-2010 03:29 AM

Very cool to be seeing times being dropped further and further

emilio700 01-10-2010 05:01 AM

YouTube - Kraftwerks Rotrex Miata at SOW

y8s 01-10-2010 10:34 AM


Originally Posted by hustler (Post 506226)
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.

bellwilliam 01-10-2010 11:45 AM


Originally Posted by y8s (Post 506280)
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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