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PostPosted: Mon Nov 29, 2021 8:19 am 
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Joined: Fri Dec 23, 2011 6:59 am
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Location: Spring Hill, FL.
The rules state that all air must enter through the throttle body . All ECU cars use some sort of throttle by pass to control idle. The letter addresses that oversite with" must retrain OE throttle system or be eliminated entirely ".

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Mike Ogren/Protech Racing, http://www.FWDracingguide.com http://www.ogren-engineering.com/ 352.428-8983 mogren@tampabay.rr.com


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PostPosted: Mon Nov 29, 2021 1:40 pm 
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Joined: Wed Nov 11, 2009 9:57 am
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Mike, Can you share the link to that letter. I can't find it. Thanks

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David Boles
HP MK 3 GTI #79
Boles Motorsports


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PostPosted: Mon Nov 29, 2021 2:11 pm 
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must retrain or must retain ???

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Matt Blehm
Houston Region
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PostPosted: Mon Nov 29, 2021 4:51 pm 
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Joined: Fri Dec 23, 2011 6:59 am
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Location: Spring Hill, FL.
https://crbscca.com/?page=trackLetterRe ... erID=31796

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PostPosted: Mon Nov 29, 2021 5:40 pm 
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Joined: Thu Feb 28, 2019 5:57 am
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No one is allowed to view other members' letters, other than its status. Which is not particularly useful (even to the letter writer...)

I retrain mine to rollover.

This is a good point, however. What keeps someone with a fully-tune-able ECU from opening the IAV bypass during full throttle? Not that it's a lot of airflow...

And, given you can't stop it (or scrutineer it), what do you do about it? Is it worth adjusting weights to accomodate the possibility? You'll need to deep-investigate the advantages of each individual implementation if you're going to...

In the end, it's probably "warts and all." Or ban that evil "fee-yoooll injection dragon" straight to hell!

GA


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PostPosted: Tue Nov 30, 2021 4:37 am 
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Joined: Wed Nov 11, 2009 9:57 am
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Sorry, Thought it might already have been addressed. I sent a letter also. You know every car with an idle air bypass screw is just as illegal as a car with an electronic idle air valve. (Miata, Mk 1 & Mk2 VW, to name a couple) The issue I have is with a wide duration camshaft, the high idle required to keep it running using open throttle butterfly doesn't kill a hot engine at shutdown. A factory idle control valve shuts off the air and the engine stalls.

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David Boles
HP MK 3 GTI #79
Boles Motorsports


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PostPosted: Tue Nov 30, 2021 5:52 am 
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Joined: Tue Dec 20, 2011 5:53 pm
Posts: 42
Location: Rochester, NY
david boles wrote:
Sorry, Thought it might already have been addressed. I sent a letter also. You know every car with an idle air bypass screw is just as illegal as a car with an electronic idle air valve. (Miata, Mk 1 & Mk2 VW, to name a couple) The issue I have is with a wide duration camshaft, the high idle required to keep it running using open throttle butterfly doesn't kill a hot engine at shutdown. A factory idle control valve shuts off the air and the engine stalls.


Are you saying the stock vw throttle body is illegal? Or just using it as a comparison to the electronic.

Also, killing fuel and plugs should shut off the engine, no? From a safety standpoint.

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Jason LaManna
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PostPosted: Tue Nov 30, 2021 11:00 am 
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Joined: Fri Dec 23, 2011 6:59 am
Posts: 1618
Location: Spring Hill, FL.
I drilled a .200 hole in the throttle plate ,and screwed the idle screw all the way in to be legal . My idle air motor hose is removed and plugged to be 100% legal .
I tried useing the bypass hose for more air /faster back in the ITB days. Waste of time , idled at 2300.
Of course the dat acc system was a VHS camera strapped to the cage , pointed at the tach and dash mounted WOT light and brake light indicator. Not great data. I still have the camera , ,might have a porn tape in it:). I had a client that was part of a group that made a few movies. "Backside to the future" and "Buttsizer, King of rears" Funny stuff . I used to work on Deloreans . Not the one in the movie I dont think tho.

Thanks to Matt for usefull addition to the tthread. I put that with the rest of your useful post ..
Yeah , I flunked out of engineering school for english. whood da thought it . ? Do ya know how hard it is to mispeel all these words today with autcorectum ? If it 's not all underlined in red I go back to fix it mo better.

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PostPosted: Tue Nov 30, 2021 11:23 am 
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Joined: Mon Jan 05, 2015 8:45 am
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I'm confused. Are there cars where the IAC is drawing air that does not come through the throttle body?

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Bill H
92 Saturn SL2 - SCCA F-Production


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PostPosted: Tue Nov 30, 2021 12:07 pm 
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planet6racing wrote:
I'm confused. Are there cars where the IAC is drawing air that does not come through the throttle body?


"All inducted air must pass through the throttle body and be subject to control
by the throttle butterfly."

IAC's bypass the butterfly, that's the bugaboo

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Jonathan Spiegel
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