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Old 10-20-2001, 06:01   #1 (permalink)
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Big Bore Throttle Body On 4.0l Engine ?

So far on my EF 6 Auto ive put crow stage II cam, XR police series computer, genie headers, 2.5" exhaust, EL plumbing, t series snorkel & cold air ram from the lower bumper etc, etc etc, goes great does 0-100 6.9 -7.0 sec.

Ide love a 5.6l TS50 but cant afford one.

Has anyone had experience in playing with the throttle body on the 6 ?. For instance, would the 65mm 5.0l V8 fit, what about the Tickford 70mm ? what about the computer side with the plug and calibration etc ?. I dont know what the diameter of the 6 cyl one is, but would a bigger throat make a difference ?.

Any answers would be appreciated - thanks - Frank.
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Old 10-22-2001, 08:46   #2 (permalink)
paul
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They look fairly big? Does the tickford xr6 have any different? You can check I guess by fitting a vacuum guage in manifold behind throttle body and at full throttle there should be very little vacuum.
The trouble with real big t/bodys is that it makes it hard to drive down low.One touch of the throttle and you are well on your way,I guess thats why the new 5.6 W has a cam type system for throttle, so it opens progresivly slow at light throttle...good engineering...
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Old 10-22-2001, 21:38   #3 (permalink)
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hmmm nice redwards..
XR police series computer..
do you know what specs are different on it?

Will
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Old 10-22-2001, 22:40   #4 (permalink)
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Attn Black S :
The software on the police series ECU on the EF XR6 as far as I know is;
* Rev limiter increased to 5950 rpm before
fuel cut off. (Stnd is @ 5500 rpm
* Speed limiter either raised to higher speed or removed (car has sustained just over 200kph but not game to go further - just in case (that tailshaft thing))
* Aggressive change pattern with VERY POSITIVE engaging of the clutches to eliminate flare with high rpm upchange.

But seriously, the 4 litre has the famous twin scroll intake manifold, so surely a larger throttle body could only help.

Someone says the problem isn't a small throttle body, but a too small pommy MAP(Maximum Air Pressure) sensor. Anyway - please check in.
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Old 10-23-2001, 09:25   #5 (permalink)
RAVEN
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redwards

where did you get the XR police computer from and is it just a matter of changing over the computer without any wiring changes?

How much do they cost?

I have a EF II Fairmont (6 cylinder)

Thanks
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Old 10-23-2001, 15:29   #6 (permalink)
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No inlet air go's through m.a.p sensor,it measures vacuum etc..
You are not confused with m.a.f[mass air] on the V8 that is between aircleaner and throttle body.They are usually smaller than t/body..
The six don't have-m

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Old 10-23-2001, 17:19   #7 (permalink)
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Hi Redwards,

kewl.. the computer sounds great. but what is the twin scroll intake manifold??
hmmm i'd love to have one.
But my car is a Manual.. oh well.
guess i'll save for a aftermarket chip.

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Old 10-23-2001, 17:48   #8 (permalink)
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attn: Paul.
Thanks for the correction. Your right, i was thinking of the MAF. And yes it's not on the 6 because it uses an MAP which takes a reading from elsewhere.

Raven & Black S:
The computer was bought on exchange from Metro Ford in Brisbane, it was pure luck I got this one. It could have been a standard XR computer. Cost exchange was $420

But none of this answers the question.

Will the larger V8 throttle body fit the 6 ?
Would it make a difference ?

PS. Black S. If you have an EF, EL right thru to AU they all have the twin scroll inlet manifold.
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Old 10-27-2001, 05:56   #9 (permalink)
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I rang Herrod Motor Sport and asked them the same question about a larger throttle body. The guy told me the throttle body was plenty adequate, he said the mods they do at Herrods produce 14 sec 1/4 mile times.

They reccomend the following -
a, Exhaust (Headers/extractors + 2.5" system)
b, Cam (eg, crow satage II)
c, Spots air cleaner (K & N etc)
d, For EF, upgrade to EL plumbing (air tubes)
e, Cold air ram into air box & XR snorkel
(you can get the Tickford for looks)
f, Dyno tune & Unichip enhancement ($1200)

They didn't reccomend head work.

I would be interested to hear from anyone thats actualy done these mods including the unichip.

I estimate flywheel power with the above done to be around 205kw to as much as 220kw

And the New AV engine sounds better, 180KW DOHC 24 valve,and a turbo option, suck eggs Holden enjoy your push rods.

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Old 10-27-2001, 19:51   #10 (permalink)
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Redwards,

Hmm those mods sounds great.
But I'd love to see a car with those mods in action..
How about you?? got the plans for the rest of those mods??
Will
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