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Old 06-26-2004, 22:27   #1 (permalink)
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Throttle body

Is anybody running a 90mm throttle body?Or know anybody who is?If so what engine set up are they running?
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Old 06-26-2004, 22:55   #2 (permalink)
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Re: Throttle body

90mm t/b is over kill, the biggest that your engine will probly require is maybe a 82mm t/b, off the t3, but even then a 75mm will give you the best all round response, with out killing bottom end torque, and still flows really well up high.
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std stroke, alloy heads, comp cam, tfs manifold, 75mm t/b, 70mm maf, 30lb inj, adj fuel press reg, twEECer

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Old 06-26-2004, 23:03   #3 (permalink)
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Re: Throttle body

Eb....you are running a 75mm t/b on a five litre and not turning it as hard as I am,and I have a few more cubes as well !
As I said before,I am learning so I am open to discussion.
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Old 06-26-2004, 23:11   #4 (permalink)
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Re: Throttle body

for the sake of asking a siilly question, as we are learning and sharing, wouldn't a set of twin 40's or similar be a more tractable set up than one big 90mm one?

I can understand a custom upper would need fabricating but in theory would the twin set up be best?
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Old 06-26-2004, 23:26   #5 (permalink)
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Re: Throttle body

you can get a twin 58mm t/b setup off a f series, as far as you having more cubes that will help you out but it doesn't nessicerily mean that you need a t/b of that size, i've got a motor that has been built to see over 6500rpm, strokers wern't designed to do those sort of revs, more for low down torque. as i said before the bigger you go with the t/b the more bottom end you will loose, and thats no good on the street.

the setup that i'm running at the moment was originally off a mates inj 351c, and that thing was definetly no slouch. i beleive that you could probley get better divability from the t3's with a 75mm. 82mm would be the biggest i would go for your setup.
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Old 06-26-2004, 23:43   #6 (permalink)
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Re: Throttle body

Woah 90mm that's huge! I can't fathom ANY windsor engine that would need one that big. How big are V8 Supercar T/B's?
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Old 06-26-2004, 23:46   #7 (permalink)
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Re: Throttle body

Yes, my engine too is built for 7000k+(scat forged crank,scat "h" beams,srp forged pistons and so on....) but my cam is only good for 6500(comp cams specs).........So the question remains.....????
The trickflow site says"R" manifold......

Large Cross-Section
with 12.2 in. Runner 2,500 to 7,250 rpm 75 mm 2.0 in. x 1.2 in. 2.38 in. x 1.38 in. 11.0 in. Black Powdercoated
Upper
TFS-51500005 Large Cross-Section
with 12.2 in. Runner 3,000 to 7,750 rpm 90 mm 2.0 in. x 1.2 in. 2.38 in. x 1.38 in. 11.0 in. Silver Powdercoated
Upper
With the extra 40 odd cubes that should bring the power range down a little(about 500rpm)

The question still remains????
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Old 06-26-2004, 23:59   #8 (permalink)
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Re: Throttle body

a 90mm t/b is designed more for 351w strokers, no 302 would make use of a t/b that size. as far as manifolds are concerend the r series would be the ideal manifold for you, just get on without the egr port as you wont be required to run an egr
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Old 06-27-2004, 01:09   #9 (permalink)
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Re: Throttle body

"no 302 would make use of a t/b that size".....I dont have a 302.???
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Old 06-27-2004, 01:14   #10 (permalink)
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Re: Throttle body

if you read the star of the post it said that the 90mm was designed more for 351w strokers, you could get away with using a 90mm on a 347 if you were to s/c it but otherwise dont go anywhere near that size.
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