I am currently converting a 1966 Chevrolet straight 6 (230ci, 3.8L) to efi with mega squirt. Currently i am searching for a suitable throttle body. Anyone have some suggestions? (i plan on making about 280-350 hp)
something with an IAC controller would be nice to.
Thanks
-Matt
42 year old carb to efi help
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Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0).
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
The full forum rules are here: Forum Rules, be sure to read them all regularly.
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whatswithhumans
- MegaSquirt Newbie
- Posts: 3
- Joined: Sat Nov 22, 2008 12:35 pm
Re: 42 year old carb to efi help
A lot depends on what you're working with. Port or throttle body injection? Custom or carbureted manifold? In either case - baseplate pattern? Nitrous (dry or wet) or boosted?
David
David
-=If it was easy, everyone would do it.=-
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whatswithhumans
- MegaSquirt Newbie
- Posts: 3
- Joined: Sat Nov 22, 2008 12:35 pm
Re: 42 year old carb to efi help
i plan on doing port injection. N/A, and i am making a custom intake manifold out of aluminum (large plenum with 3 runners to the intake ports, and a throttle body on the front)
i was looking around on ebay and found some LT1 throttle bodies. think those could work?
i was looking around on ebay and found some LT1 throttle bodies. think those could work?
Re: 42 year old carb to efi help
It would make a good starting line, as there are larger versions available if the required flow exceeds the stock flow. As a rule-of-thumb, dual 48mm bores will support HP in the hight 200's, dual 52mm in the low 300 range and a single 80mm in the high 300's. If you get it running on a stock TB, and your max kPa is 95-98 or higher (sea level), you're fine. 95 or lower, you are starving the engine of air. Try it and see what you really need before spending money you may not have to.
David
David
-=If it was easy, everyone would do it.=-
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whatswithhumans
- MegaSquirt Newbie
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- Joined: Sat Nov 22, 2008 12:35 pm
Re: 42 year old carb to efi help
thanks for the advice, i found a LT1 TB (dual 52mm) with IAC, and TPS on and working.
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Matt Cramer
- Super Squirter
- Posts: 2951
- Joined: Sat Jul 03, 2004 11:35 am
Re: 42 year old carb to efi help
An LT1 throttle body ought to work well. I'm using a Ford 4.6 throttle body on my Mopar slant six.
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re-animator
- MegaSquirt Newbie
- Posts: 8
- Joined: Sat Jul 16, 2005 5:59 am
- Location: minneapolis, MN, USA
Re: 42 year old carb to efi help
Hi!
My dual 58mm on my car flows just under 1000 cfm (we tested it). LT1 motors made more HP from the factory than your goal with the 48 mms. It's going to be easier to use a GM part for parts avaiabilty and compatability with megasquirt. Maybe less fabrication,too, depending your transmission. If it's a manual shift, you don't need to worry about that, but the LT1 TB works well with a turbo 350 or GM overdrive.
hope I helped, and good luck!
My dual 58mm on my car flows just under 1000 cfm (we tested it). LT1 motors made more HP from the factory than your goal with the 48 mms. It's going to be easier to use a GM part for parts avaiabilty and compatability with megasquirt. Maybe less fabrication,too, depending your transmission. If it's a manual shift, you don't need to worry about that, but the LT1 TB works well with a turbo 350 or GM overdrive.
hope I helped, and good luck!
1973 Firebird,MS 1 w/ LT1 manifold, 408 sbc, built. 200-4R, 3.70 posi, modified suspension.
Re: 42 year old carb to efi help
Take a look at my project:whatswithhumans wrote:I am currently converting a 1966 Chevrolet straight 6 (230ci, 3.8L) to efi with mega squirt. Currently i am searching for a suitable throttle body. Anyone have some suggestions? (i plan on making about 280-350 hp)
something with an IAC controller would be nice to.
Thanks
-Matt
http://forum.msbr.com.br/download/file. ... &mode=view
http://forum.msbr.com.br/viewtopic.php? ... 77&start=0
http://www.youtube.com/watch?v=L0QqE9iosAQ
1988 Chevrolet straight 6, 250cid, 4.1L running on Mini Megasquirt
44mm Throttle Body
1 fuel injector, 119lb/h. Ethanol
Regards