throttle bodies, what would you use |
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throttle bodies, what would you use |
bernbomb914 |
Aug 15 2006, 11:04 PM
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#1
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one of the oldest Farts on this board Group: Benefactors Posts: 1,873 Joined: 29-December 02 From: Temecula, CA Member No.: 36 |
I need to go to F/I and need to know about throttle bodies, what size? what make? etc.
has any one used TWM throttle bodies? I have a 2270 with split duration cam. Bernie |
Randal |
Aug 15 2006, 11:57 PM
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#2
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Advanced Member Group: Members Posts: 4,446 Joined: 29-May 03 From: Los Altos, CA Member No.: 750 |
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TimT |
Aug 16 2006, 02:55 AM
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#3
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retired Group: Members Posts: 4,033 Joined: 18-February 03 From: Wantagh, NY Member No.: 313 |
Ive used TWMs on a few engines. They are fine.
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crash914 |
Aug 16 2006, 05:25 AM
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#4
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its a mystery to me Group: Members Posts: 1,826 Joined: 17-March 03 From: Marriottsville, MD Member No.: 434 Region Association: MidAtlantic Region |
I have the redline weber...I would go TWM. They seem very nicely finished...
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Rotary'14 |
Aug 16 2006, 06:44 AM
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#5
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Senior Member Group: Members Posts: 753 Joined: 24-April 05 From: Los Angeles Member No.: 3,977 |
I didn't like the way the TWM fuel rails looked. Too bulky in my opinion. I bought my throttle body from Australia (check the exchange rate!) I got mine cheaper than any TWM TBs I could get within the US including shipping. Nice air horns & linkage too.
http://www.efihardware.com/efi_throttle.html like this one in the poor pic -Rob Attached image(s) |
Jake Raby |
Aug 16 2006, 06:49 AM
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#6
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Engine Surgeon Group: Members Posts: 9,394 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
I have continually made MORE power on a 2270 with 40mm T/B..
The best on the planet come from Jenvey- they are all i use now. The TWMs got junky after the last batch of 2005. Bigger isn't better.. I picked up 12HP by going from a 45mm T/B to a 40mm on my "2270 Type 4 Torquer" combo... The other 2270 combos have since followed suite. |
crash914 |
Aug 16 2006, 07:06 AM
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#7
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its a mystery to me Group: Members Posts: 1,826 Joined: 17-March 03 From: Marriottsville, MD Member No.: 434 Region Association: MidAtlantic Region |
Jake, how about a 2.7?
I think that I have 45's or 48's. |
DNHunt |
Aug 16 2006, 07:38 AM
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#8
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914 Wizard? No way. I got too much to learn. Group: Members Posts: 4,099 Joined: 21-April 03 From: Gig Harbor, WA Member No.: 598 |
Bernie
I'm using a pretty stock intake on my 2270. The throttle body is bored to 50 mm instead of the stock 45. It hasn't run out of air yet. I have graphs of the manifold pressure at WOT up to 6800 rpms and there is no decrease in pressure in the plenum. The big advantage is set up. Nothing to balance and manifold vacumm is easy to sample. Jake ran an engine a while back with a smaller plenum and made more power so I may play with going smaller someday The fuel rail is stock and the injectors are stock 2.0 L. |
Aaron Cox |
Aug 16 2006, 10:34 AM
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#9
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Professional Lawn Dart Group: Retired Admin Posts: 24,541 Joined: 1-February 03 From: OC Member No.: 219 Region Association: Southern California |
TWM, Jenvey, and redline all make IDF and IDA flanged ITB's...
Jenvey is costly due to exchange rate (IMG:style_emoticons/default/barf.gif) ITB's give you better throttle response over a single tb |
lapuwali |
Aug 16 2006, 11:08 AM
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#10
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Not another one! Group: Benefactors Posts: 4,526 Joined: 1-March 04 From: San Mateo, CA Member No.: 1,743 |
TWM, Jenvey, and redline all make IDF and IDA flanged ITB's... Jenvey is costly due to exchange rate (IMG:style_emoticons/default/barf.gif) ITB's give you better throttle response over a single tb They're also very expensive, fussy to set up, it's difficult to run a cold start system with them, and it's hard to get a good MAP signal out of them. The throttle response advantage has to be weighed against other things. If you're running a stock flywheel, for example, you're not going to notice any advantages to throttle response over a *good* plenum setup. IMHO, ITBs on anything less than a dedicated racing engine are bling. |
crash914 |
Aug 16 2006, 11:11 AM
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#11
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its a mystery to me Group: Members Posts: 1,826 Joined: 17-March 03 From: Marriottsville, MD Member No.: 434 Region Association: MidAtlantic Region |
BUT........bling is cool.....
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TimT |
Aug 16 2006, 11:24 AM
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#12
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retired Group: Members Posts: 4,033 Joined: 18-February 03 From: Wantagh, NY Member No.: 313 |
And now for someting completely different
Barrel valve ITBs. I wish they made these 3 Bbl. I would have bought a set for my 911. Notice you can also fire the injector directly down the barrel. ITBS are no more difficult to set up thansay dualthroat, or triple throat carbs Attached image(s) |
Aaron Cox |
Aug 16 2006, 11:28 AM
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#13
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Professional Lawn Dart Group: Retired Admin Posts: 24,541 Joined: 1-February 03 From: OC Member No.: 219 Region Association: Southern California |
injector up top like that is great....(formula 1 style... better atomization and high rpm performance right?)
but what happens if you get a backfire? |
TimT |
Aug 16 2006, 12:03 PM
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#14
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retired Group: Members Posts: 4,033 Joined: 18-February 03 From: Wantagh, NY Member No.: 313 |
Barrel valves with a carbon plenum on a 944T.
This car makes close to 800hp (IMG:style_emoticons/default/blink.gif) sorry a wandering a bit off topic Attached image(s) |
bernbomb914 |
Aug 16 2006, 12:10 PM
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#15
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one of the oldest Farts on this board Group: Benefactors Posts: 1,873 Joined: 29-December 02 From: Temecula, CA Member No.: 36 |
I need to run the T/B because I am installing the DTM and it takes up the room over the engine. Jake thanks for the info about the size. I will chedk on the one in Austraila
Thanks fpr the input Bernie |
Matt Romanowski |
Aug 16 2006, 12:17 PM
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#16
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Senior Member Group: Members Posts: 878 Joined: 4-January 04 From: Manchester, NH Member No.: 1,507 |
Barrel valves are cool until you need part throttle....Same thing with slide valves.
Ahhhh......Milledge Turbo parts..... Matt |
Jake Raby |
Aug 16 2006, 12:51 PM
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#17
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Engine Surgeon Group: Members Posts: 9,394 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
I prefer ITB over plenums.. Its not all bling- I see huge differences in all aspects of the engine and if I'm about anything its NOT BLING!!
They are NOT fussy and not hard to set up, they allow a much smoother idle and a much more radical camshaft to be ran- period. Bern, I run a maximum of 45mm on an engine as large as a 2.8L, the only exception to that was the Mighty Spyder than used a 50mm on a 2.4 engine, but it was designed to run 9K RPM... |
Dave_Darling |
Aug 16 2006, 02:49 PM
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#18
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914 Idiot Group: Members Posts: 14,991 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California |
ITBS are no more difficult to set up thansay dualthroat, or triple throat carbs And not really much (if any!) easier, either. Which is lapuwali's point. A common-plenum setup has none of those synch issues. QUOTE Written by bernbomb I need to run the T/B because I am installing the DTM and it takes up the room over the engine. If you're motivated, you can fabricate extended intake runner pipes and just move the plenum up and aft... It's been done on at least one Bug conversion that I know of (I think Cali upright conversion not DTM though) and looked pretty decent. --DD |
banksyinoz |
Aug 16 2006, 05:20 PM
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#19
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finally getting back into it Group: Members Posts: 223 Joined: 17-June 05 From: queensland, aus Member No.: 4,293 Region Association: Australia and New Zealand |
I bought my throttle body from Australia (check the exchange rate!) I got mine cheaper than any TWM TBs I could get within the US including shipping. Nice air horns & linkage too.
http://www.efihardware.com/efi_throttle.html i have seen these used here and they are good value for money here is a crappy pic of a set on a 20bpp, they are commonly used on turbo setups here also (IMG:style_emoticons/default/beerchug.gif) Attached image(s) |
Jake Raby |
Aug 16 2006, 05:59 PM
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#20
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Engine Surgeon Group: Members Posts: 9,394 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
a common plenum is very touchy to camshaft and cylinder head designs. In some instances an engine with a plenum and a cam large enough to supply revs won't idle worth a hoot at less than 1400 RPM.
I/R is not that way. Both common plenums and I/R have their place in the world, a future 4th Dimension Radio episode will be entirely dedicated to my findings on each! |
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