Is there any reason that running individual throttle bodies would be a bad idea on a street car?
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Feb. 5, 2011 1:47 a.m. 93EXCivic SuperDork
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Feb. 5, 2011 2:14 a.m. m4ff3w SuperDork
BMW has done it plenty of times, Toyota 4AGE 20Vs, and I'm sure more than a few other cars.
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Feb. 5, 2011 2:22 a.m. 93EXCivic SuperDork
I forgot about the Toyota 4AGE 20V and also I know a lot of bikes do it. Does it really give that much extra power to be worth the work?
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Feb. 5, 2011 8:02 a.m. paul Reader
just make sure to install some sort of air filter setup...
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Feb. 5, 2011 8:27 a.m. AngryCorvair SuperDork
because they're typically mounted to very short intake runners, they kill low-end torque. motorcycles can get away with it because they need to make power to 14k rpm. your civic does not.
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Feb. 5, 2011 9:36 a.m. Keith SuperDork
I must have forgotten to select the versions that kill low end torque
Both of my engines that have been converted to individual throttles maintained the bottom end and gained up top. Not huge amounts, but we're talking naturally aspirated power. 10% gain or so.
But the biggest problem with them on a street car? They're LOUD. Not necessarily in a cool way, but they make an incredible hammering noise. I've tried running with a plenum, but that didn't help much. You can even hear the faint echoes of this hammering on my M5, muffled by acoustically engineered plenums and a thick insulation pad on the hood.
They're also a bit crotchey, but it's no worse than a hot-rod Mini on SUs in that regard. Come to think of it, the noise isn't much different.
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Feb. 5, 2011 9:40 a.m. mad_machine SuperDork
exactly.. think of them as IDFs on an older car.. but more sophesticated with fuel injection...
All the benefits, none of the disadvantages
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Feb. 5, 2011 10:03 a.m. ww SuperDork
I'm installing a pair of ITB's on one of my 240Z's. Converted the SU's to dual ITB's using the factory SU intake manifold keeping the runners exactly the same length as they were with the carbs. It's not finished yet, but shouldn't have any loss in low-end torque. Depending on the ITB setup, you can gain low end torque.
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Feb. 5, 2011 10:22 a.m. mad_machine SuperDork
My father's old 260z used an odd intake with a single Weber IDF.. I think it was a 44. Basically three cylinders fed off of each throat. Made for some awesome noises and acceleration
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Feb. 5, 2011 10:51 a.m. alfadriver SuperDork
One of reasons you don't see ITB on more production cars is that you give away a free source of vacuum.
The whole engine tuning, PCM tuning, etc- can all be overcome. Heck, even MS does a good job with the blend between throttle and pressure maps.
There are a lot of things that use vacuum to operate, so it's hard to give it away. And that source also makes purging easier.
But if this is a toy- go for it!
Eric
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Feb. 5, 2011 10:56 a.m. 93EXCivic SuperDork
I was just thinking out loud. Don't think I am really doing to it.
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Feb. 5, 2011 11:37 a.m. NickF40 Reader
ITB <3 I'd risk the noise, I want them, now them vs turbo is my issue
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Feb. 5, 2011 11:47 a.m. oldeskewltoy Reader
the biggest problem with ITBs is the same problem with any multi carb install.........
syncronization
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Feb. 5, 2011 11:57 a.m. m4ff3w SuperDork
NickF40 wrote:
ITB <3 I'd risk the noise, I want them, now them vs turbo is my issue
Do both, problem solved.
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Feb. 5, 2011 1:52 p.m. NickF40 Reader
Ahh there we go! Instead of ITB's, I believe in the bike throttle bodies, 2010 R1 TB's for $80 hell yes!
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Feb. 5, 2011 7:56 p.m. Curmudgeon SuperDork
The Dellortos on the J-H (basically 4 long ITB's with float bowls in between) have a 'bullfrog' sound which has a 'hammering' undertone to it. It doesn't lack bottom end, in second gear it will pull away easily from a stop.
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Feb. 6, 2011 12:52 p.m. NickF40 Reader
m4ff3w wrote:
like this? http://www.youtube.com/watch?v=hbcRRPAcwWg&feature=relatedNickF40 wrote:
ITB <3 I'd risk the noise, I want them, now them vs turbo is my issue
Do both, problem solved.
