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Old 12-30-2003, 01:08   #1 (permalink)
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Question Throttle body

Hey everybody I got a EBII I6 4.0...I was wondering how much and what diff would a quad throttle bodied, inlet manifold make...

Thank you
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Old 12-30-2003, 02:01   #2 (permalink)
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Re: Throttle body

firstly..... you'd need six throttle's not four

it would make gains in a worked form, but in a stock application, it may not be worthwile the expense.

also you would have to change to an aftermarket ecu and run a tps (throttle position sensor) instead of the standard ecu running the MAP sensor.

the only way to get the MAP to work would be to tap into each port and run a vaccume line back to a box so the map sensor can get a reading of the running conditions of the engine.

to make most of six throttles... you'd need, massive ported head, big cam, nice extractors and an aftermarket ecu. basicly a hard tuned n/a set up.

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Old 12-30-2003, 22:27   #3 (permalink)
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Re: Throttle body

MAP and MAF sensor setups run a TPS joe...

but yes, you would need 6 if you were going to do it, and the expense is not worth it, there will be minimal HP gain for a huge outlay in $$$, at the very least you would need a specially programmed engine management system as well.

how much HP are you after? Soxx has shown that 161rwkw is possible with stock injectors and Broad band intake manifold/throttle body (you know the EF onwards ones?)
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Old 12-30-2003, 22:50   #4 (permalink)
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Re: Throttle body

I do wonder how much improvement a 6 TB setup would make to these engines.
I suspect the advantage up top will be heavily disadvantaged at lower revs though.
I might make one some day to play with.....

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Old 12-30-2003, 23:51   #5 (permalink)
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Re: Throttle body

Rolin on a MAP based system with multiple tb's you can't use the vacuum signal at idle because it fluctuates and is generally poor. So, the 2 options are to run TPS only or aftermarket ecu which will ignore the map signal at 0% tps.
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Old 12-31-2003, 15:48   #6 (permalink)
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Re: Throttle body

Quote:
Originally Posted by Soxx
I suspect the advantage up top will be heavily disadvantaged at lower revs though.
Rick.
i thought this too, but a mate of mine tells me that all the ones hes dynoed have made better power all the way through... im not sure if its possible, but thats what he reckons
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Old 12-31-2003, 20:33   #7 (permalink)
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Re: Throttle body

An example of multiple tb's thats works well is on motorcycles. I believe the Ducatti 998R has twin 63mm tb's. Even though they have little weight their low rpm torque is still excellent.

Although multiple tb's can be very hard to tune, small tps values equates to lots of airflow. This can cause jerkyness on throttle application.
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Old 12-31-2003, 22:45   #8 (permalink)
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Re: Throttle body

not ford -
A Ducati has good torque for a motorbike at the revs a motorbike typically spins at.
The bike you're talking about redlines at over 10,000rpm.
'Good torque' for that machine is considered to be at between 5000rpm and 8000rpm, so to compare in such a way is meaningless, as a Ford I6 is not realistically going to spin beyond 6500rpm, and 5800rpm if using the standard ECU.

So in actual fact, the low speed (2000rpm - 3500rpm) torque is quite poor.

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Old 01-01-2004, 03:27   #9 (permalink)
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Re: Throttle body

Ey Soxx can you give us a list of what you've done to your 6cyl and if you dont mind, what kind of money you've spent :)

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Old 01-01-2004, 04:31   #10 (permalink)
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Re: Throttle body

Actually Soxx good torque for that sort of bike would be about 3500 to 6000rpm, my friend used to road race motorbikes. He raced a friend's 748 once and the guy got shitty at him for going over 10,500rpm just in case it dropped a valve. Most of these bikes idle at about 1000rpm to begin with so you have to be realistic.

Also I don't think the factory would go over oversize on the tb's on a factory road bike, the consumer would complain about it too much. This is also proven by the fact that nearly all the factory superbike teams most run even larger tb's.

The point I am trying to make is a multiple tb setup can be made to work well but for cost boost would be better bang for buck.

V8 supercars run multiple tb's and even with 3.5 gears they toast the tyres from about 3000rpm on the roll (although the motors cost about $100,000 each).
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