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AppleBit
Joined: 16 Nov 2002
Posts: 1516
Location: Minneapolis, MN
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 Posted: Fri Jul 15, 2005 9:52 am Post subject: EFI being installed on the P-24 |
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Ok guys,
Looking to purchase an Electromotive Tec3 (maybe a Tec2 if the price is right) for the Porsche and install it.
Thoughts I have are what TB to use? I think adapting a GM throttle body to my car would be the best as all the sensors are already on the TB and I would just have to put the MAP sensor on the intake manifold (not hard).
I have a problem with dual throttle bodies as I would have to calibrate the EFI computer for each one and that would start to become an issue.
My brother says I should only go with a 52 mm throttle body but that is mostly cauz this throttle body comes off the 60 degree v6 chevy engines and he only likes those engines. I think 52 mm is a little on the small side and I would like to shoot for something closer to 60 mm at the least.
Has anyone else adapted a throttle body onto these cars or have an idea of what would fit reasonably?
Thank you for your response(s),
- Jon McCullough
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endwrench
Joined: 07 Dec 2002
Posts: 1631
Location: Victor, Montana
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| Posted: Sat Jul 16, 2005 4:14 am Post subject: |
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Really a 52mm TB should be more than sufficiant. I wouldn't go any larger than 60mm though. You may create some drivavbility and tuning problems. Progressive linkage may be needed for the large TB's so you don't have tip-in problems.
Todd |
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CBass
Joined: 03 Nov 2002
Posts: 2807
Location: Vancouver, Canada
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| Posted: Sun Jul 17, 2005 3:56 am Post subject: |
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A MK2 VW throttle body bolts on, they had digifant injection for the later years I think, so maybe a throttle position sensor too?
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AppleBit
Joined: 16 Nov 2002
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Location: Minneapolis, MN
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moone924
Joined: 05 Feb 2003
Posts: 869
Location: Douglas Wyoming
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| Posted: Mon Jul 18, 2005 8:41 am Post subject: |
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There's some info on VW TB's on the megasquirt forum site. I think the first year for TPS is '93 on a automatic Passat,
Search eBay for "VW throttle bodY"
THis has TPS, but might not have the same size flange, as it's from a VR6:
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&rd=1&category=33558&item=7986786615
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Ryan Moone
Always shopping for a nice s2 931 to baby.
New philosophy : one car project at a time. |
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AppleBit
Joined: 16 Nov 2002
Posts: 1516
Location: Minneapolis, MN
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| Posted: Mon Jul 18, 2005 10:38 am Post subject: |
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I think I found the right flavor (Throttle Body)- won't tell ya guys what yet as I want to remain mysterious and need to find out if I can make a good adapter plate; but if this works your gonna see an easy way to put a modified throttle body on your car that has IAC and TPS setups with the sensors that work with all stand alone setups...
Mysterious? Yes
Curious? You tell me if you are  Maybe I'll share my secret tomorrow when I get the plate all fabbed up
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CBass
Joined: 03 Nov 2002
Posts: 2807
Location: Vancouver, Canada
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| Posted: Mon Jul 18, 2005 11:44 am Post subject: |
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| AppleBit wrote: | | CBass wrote: | | A MK2 VW throttle body bolts on, they had digifant injection for the later years I think, so maybe a throttle position sensor too? |
Can you find an example of one on the internet? (Photo)
or what year make model exactly? I would like to find out more about this but having a hard time doing google searches...
If you could find it, a million thank you's would be in order... |
Couldn't find a good pic on google, but I know for a fact the MK2 CIS throttle body is the same bolt pattern, the primary/secondary arrangement is the same, and the linkage works in the same way. I know the Passat used a similar throttle body, I'll try to pull the t/b off of my parent's passat and compare it.
Moone924, that throttle body won't bolt up to a NA or series 1 931, those throttle bodies are oval with two butterfly valves. It might possibly work on a series 2 931 though, as they used a single butterfly square flange throttle body. That's just speculation though.
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AppleBit
Joined: 16 Nov 2002
Posts: 1516
Location: Minneapolis, MN
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| Posted: Mon Jul 18, 2005 2:07 pm Post subject: EFI made easy |
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ok, final layout to the intake design of the P-24 EFI project:
1. P-24 manifold to custom adapter plate (still being fabbed up)
2. custom adapter plate to 60 degree GM TB
3. 60 degree GM TB to stock P-24 intake tube (after the stock 924 TB - just the first one that used to bolt up to the P-24 TB)
4. Intake tube to air filter (still looking for something to build up here)
5. (seperate from rest) where cold start injector went an aluminum plate will be built where a specific GM MAP sensor will go. All with no drilling or machining to anything on the car!
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Will be able to test fit once endwrench's new fuel rail I bought comes my way later this week to verify any clearance issues.
Folks! This is the easiest way to convert your car over to EFI! If this works out, I can supply the adapter plate so you don't have to change out the manifold and can have all the sensors on your car without any fabrication.
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moone924
Joined: 05 Feb 2003
Posts: 869
Location: Douglas Wyoming
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| Posted: Mon Jul 18, 2005 2:56 pm Post subject: |
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okay I looked at the megasquirt site, it's a Automatic 16v Passat TB.
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Ryan Moone
Always shopping for a nice s2 931 to baby.
New philosophy : one car project at a time. |
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CBass
Joined: 03 Nov 2002
Posts: 2807
Location: Vancouver, Canada
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AppleBit
Joined: 16 Nov 2002
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Location: Minneapolis, MN
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CBass
Joined: 03 Nov 2002
Posts: 2807
Location: Vancouver, Canada
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| Posted: Mon Jul 18, 2005 4:29 pm Post subject: |
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Heh, can't sleep until the girlfriend gets here, only 11:30 anyways. 
Snippet from Jon's link relevant to throttle bodies with TPS Said TB's include Passat 16v automatics, some Audi 5 cylinders (NM and 7A engines, probably others) and some G60's.
Reading something on a VW board currently, someone claims that certain BMW throttle bodies are a bolt on upgrade for a MK2 VW, and are much larger.
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CBass
Joined: 03 Nov 2002
Posts: 2807
Location: Vancouver, Canada
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| Posted: Mon Jul 18, 2005 6:07 pm Post subject: |
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Seems that the Digifant II equipped VW MK2's did not come with a throttle position sensor, but instead worked off of WOT and CT switches.
The Digifant I throttle body did use one, it's from the Corrado G60, possibly G60 Passat as well. I have no idea whether that one will fit or not.
A coworker has a MK3 Motronic Golf, so I'll have a look at her throttlebody and see if it's interchangeable.
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AppleBit
Joined: 16 Nov 2002
Posts: 1516
Location: Minneapolis, MN
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| Posted: Mon Jul 18, 2005 11:39 pm Post subject: |
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| CBass wrote: | Seems that the Digifant II equipped VW MK2's did not come with a throttle position sensor, but instead worked off of WOT and CT switches.
The Digifant I throttle body did use one, it's from the Corrado G60, possibly G60 Passat as well. I have no idea whether that one will fit or not.
A coworker has a MK3 Motronic Golf, so I'll have a look at her throttlebody and see if it's interchangeable. |
This is why I love the 924 community. We have so many people that really help out and always provide good information Thanks CBass!
- Jon McCullough
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CBass
Joined: 03 Nov 2002
Posts: 2807
Location: Vancouver, Canada
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| Posted: Wed Jul 20, 2005 6:42 am Post subject: |
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Throttle body from a 2.0 16v in a Passat fits, but again, no potentiometer. It is much larger than a 924 throttle body though, 52mm secondary butterfly.
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