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throttle body choices for EFI

 
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924RACR  



Joined: 29 Jul 2001
Posts: 9109
Location: Royal Oak, MI, USA
PostPosted: Sun Jul 13, 2008 2:03 am    Post subject: throttle body choices for EFI Reply with quote
Just a note on an option I think is a decent choice (cost, complexity etc)...

We decided to completely replace my stock 931 (S2) throttle body with a newer one; both mine leak at the throttle shafts, and they have no real/modern TPS (throttle position sensor), so it seemed easier to just get a new TB with a TPS already on it than futz with repairing the old ones, and still have to fit a TPS.

I chose to go the GM route; inexpensive, readily available, and still good quality (I loathe Ford electricals). Logical choice seems to be the Ecotec engines; they have 2.2-2.4L, including turbo and supercharged.

We ended up snagging a 2.2L turbo Ecotec TB, and as it turns out it's just slightly larger than stock 931 S2 TB; stock looks to be about 55mm at the choke, and this one seems to be about 58mm. May be as small as 55mm - hard to measure down in that choke.

Additionally, they seem to be able to be found on eBay for around $50-60USD, presumably with TPS still attached.

Of course, just to complicate things, we're adding a layer of complexity on our conversion; will be using the TB from a relatively new car, Bosch components of course, so it's basically from a current/new Saturn Sky Redline/Pontiac Solstice GXP...

...and it's Electronic Throttle Control (ETC) - what you'd call drive-by-wire. My ECU will handle all the controlling for the ETC, allow whatever throttle progression curves I like, and when/if I get around to installing a 951 suspension with big brakes and wheel speed sensors... it'll make the traction and launch control smoother (as opposed to using only fuel and spark).
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356speedster  



Joined: 06 Aug 2006
Posts: 122
Location: Norway
PostPosted: Sun Jul 13, 2008 8:55 am    Post subject: Reply with quote
Good info on the TB, nice to know for later projects

BTW: the ETC sounds interesting, but which ECU can control this? Can this be used with a MegaSquirt setup?
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924RACR  



Joined: 29 Jul 2001
Posts: 9109
Location: Royal Oak, MI, USA
PostPosted: Sun Jul 13, 2008 10:37 pm    Post subject: Reply with quote
No, not that I know of. This ECU is not publicly available...
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Vaughan Scott
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'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype
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