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Old 09-26-2003, 10:31 AM   #1 (permalink)
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TWM Induction Throttle Body Kits

First time I came across this mod for H22A, is this only suitable for DRAG purposes??



TWM is a manufacturer of intake manifolds, for competition style carburetors, such as the Weber DCOE Series. When a number of programmable, fuel injection electronic control units (ECUs) became available in the performance aftermarket, it was obvious that many enthusiasts would want to convert from carburetors to injection. TWM throttle bodies permit the conversion of virtually any engine equipped with a suitable manifold to fuel injection. These individual runner systems are the best way to convert a competition engine to EFI.

source: MODACAR
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Old 09-26-2003, 11:28 AM   #2 (permalink)
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Usually (and I am speaking in general terms) ITBs really scream on the top end at the expense of the bottom end. They do work very well for both drag and road racing applications, but aren't generally used on street driven vehicles (no EGR provisions, no MAP provisions, etc). In order to use a MAP sensor, and to run any type of vacuum accessories, a vacuum log must be used. These are generally not included with the kits, although aftermarket ones can be found.

It is also very difficult to run these with a stock ECU. In general, it is impossible, although I have heard of one shop that had ITBs running on a B series engine with just a piggy back computer. Although I find it quite hard to believe, it is possible, I suppose. The best option for fuel and spark control would be a stand alone ECU. It's the only thing that is going to be flexible enough for one to get the maximum benefit out of ITBs.
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Old 09-26-2003, 04:55 PM   #3 (permalink)
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Sounds like a lot of work and hassles to make this mod work. I notice the ITBs have rather short and straight runners, it this what makes the high end gains generally?
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Major mods:
Power TWM ITB/AEM EMS/RC440/JUN valvetrain/SMSP headerback/P&P head/GE sleeved/JE pistons/Ferrea Comp Plus/Eagle rods
Stiff stuff TEIN Flex/ST sways/Harness bar/Spoon F&R/ESP traction
Drivetrain Quaife LSD/JUN FWheel/Exedy organic/Lean SS
Stoppers Spoon 4pot/AEM rotors/AEM pads
Cooling C&R radiator/Hondata gasket/Mugen thermopack
Others Place Racing mounts/HKS ground/Greddy catch can
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Old 09-26-2003, 07:22 PM   #4 (permalink)
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since you have an SS you are kinda SOL, since the best you can do is run a piggy back computer.
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Old 09-27-2003, 03:09 PM   #5 (permalink)
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What is the best piggy back system that works on SS do you know??
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Major mods:
Power TWM ITB/AEM EMS/RC440/JUN valvetrain/SMSP headerback/P&P head/GE sleeved/JE pistons/Ferrea Comp Plus/Eagle rods
Stiff stuff TEIN Flex/ST sways/Harness bar/Spoon F&R/ESP traction
Drivetrain Quaife LSD/JUN FWheel/Exedy organic/Lean SS
Stoppers Spoon 4pot/AEM rotors/AEM pads
Cooling C&R radiator/Hondata gasket/Mugen thermopack
Others Place Racing mounts/HKS ground/Greddy catch can
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Old 09-28-2003, 04:54 AM   #6 (permalink)
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Quote:
Originally posted by LVSBB6
Sounds like a lot of work and hassles to make this mod work. I notice the ITBs have rather short and straight runners, it this what makes the high end gains generally?
yes, generally, shorter intake runners perform better at high rpm, and longer intake runners give more low end and torque. thats why we have the butterfly valves in our intake manifolds, at lower rpm, the air goes through longer runners, when you hit a certain rpm(vacuum) the valves open up and the air goes through shorter runners, so you get the best of both worlds..
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