Will94
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Registered: 1st Nov 02
Location: Nr. Ipswich, Suffolk
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Rite.... the plan is to bore out the inside of the throttle body as much as possible and fit a new enlarged butterfly to suit.
Anyone ever had any experience of such a mod, any pitfalls?
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Vaux Lad
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Registered: 15th Dec 04
Location: Stoke-on-Trent
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Pointless.
The standard throttle body is plenty big enough.
Whats the spec of your 1400 btw? Seems like a decent power output?
[Edited on 25-09-2007 by Vaux Lad]
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Rob_Lee
Banned
Registered: 9th Dec 05
Location: Folkestone Drives: Nova 1.6 16v
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if your gonna ignore people and do it then i'd think again as you'll prob end up boring it out too much and cutting into one of the tb waterways.
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Will_Sport
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Registered: 28th Jun 04
Location: Notts
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quote:
Originally posted by Vaux Lad
Whats the spec of your 1400 btw? Seems like a decent power output?
says:
Protec stainless 4-1 manifold, decat pipe, custom fabricated cat back exhaust (straight through centre section w/custom chrome backbox), PiperX cone filter, Mantzel power box, FSE power boost valve set to 56psi, EGR blanked/SAI system removed
in his profile... lots of power with no mention of remap?
but then again his in car entertainment description is funny.
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Will94
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Registered: 1st Nov 02
Location: Nr. Ipswich, Suffolk
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curently running the mantzel and the waterways are not in use. Got the provisions to do it at work on the CNC lathes so can do a proper job
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ainsley_brader
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Registered: 24th Mar 02
Location: Tattershall, Lincolnshire
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are you running a 1.4 or 1,6 lower inlet manifold
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Will94
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Registered: 1st Nov 02
Location: Nr. Ipswich, Suffolk
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1.4 lower inlet, didnt think the 1.6 lower inlet was any different?
And no it hasnt had a remap but it needs it 
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ainsley_brader
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Registered: 24th Mar 02
Location: Tattershall, Lincolnshire
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ports are considerably larger in the 1.6 lower inlet will make more difference than boring out your tb
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Will94
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Registered: 1st Nov 02
Location: Nr. Ipswich, Suffolk
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job done!! should fit the head the same i'm guessing?
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Superlite Ltd.
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Registered: 9th Jan 07
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"To a large extent, the power and torque out put on any engine is dependent on the volume of air its capable of drawing in. Research shows that the standard GM throttle bodies fitted to most Vauxhall engines are undersized and act as a bottle-neck to the inlet charge, pegging back power and torque. To over come this we dismantle the OE throttle body and use a CNC lathe to enlarge the diameter of the unit, as well as installing a new, bigger throttle disc and low profile spindle to suit. Typically, this results in an increase in full throttle cross sectional area of between 10 and 20%. The result? Improved torque and power outputs usually in the order of 4 to 7 bhp, as well as superior throttle response and a sharper feel to the engine. All throttle body reworking is carried out on an exchange basis"
But i wouldn't do anymore that 3mm increase in total diammeter
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ainsley_brader
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Registered: 24th Mar 02
Location: Tattershall, Lincolnshire
User status: Offline
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you could also look for a 1600 head and or cams! Or a complete engine 
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andyc1234
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Registered: 7th Nov 06
Location: Lancashire
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i have a 1600 ported head and lower inlet and courtenay tb for sale 
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Will94
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Registered: 1st Nov 02
Location: Nr. Ipswich, Suffolk
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Bugger, already got a 1.4 head ready to collect this fri lol how much all the same?
And its looking like its worth gettin this lil shizzle in the lathe after all 
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Will94
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Registered: 1st Nov 02
Location: Nr. Ipswich, Suffolk
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Spare throttle body opened out and new butterfly made on the CNC mill. Will post pics later and any change in performance when its fitted 
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Stu_22
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Registered: 25th Mar 02
Location: Luton
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How much did you open it up by?
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Will94
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Registered: 1st Nov 02
Location: Nr. Ipswich, Suffolk
User status: Offline
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3mm larger round the butterfly, but on the air filter side of the butterly opened it up by about 4ish then tapers down to 3 jus b4 the butterfly, will post pics soon. looks good
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Superlite Ltd.
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Registered: 9th Jan 07
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That sounds about right, good work
p.s. you could make yourself abit of pocket money doing this
[Edited on 03-10-2007 by Superlite Ltd.]
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Vaux Lad
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Registered: 15th Dec 04
Location: Stoke-on-Trent
User status: Offline
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quote:
Originally posted by Superlite Ltd.
"To a large extent, the power and torque out put on any engine is dependent on the volume of air its capable of drawing in. Research shows that the standard GM throttle bodies fitted to most Vauxhall engines are undersized and act as a bottle-neck to the inlet charge, pegging back power and torque. To over come this we dismantle the OE throttle body and use a CNC lathe to enlarge the diameter of the unit, as well as installing a new, bigger throttle disc and low profile spindle to suit. Typically, this results in an increase in full throttle cross sectional area of between 10 and 20%. The result? Improved torque and power outputs usually in the order of 4 to 7 bhp, as well as superior throttle response and a sharper feel to the engine. All throttle body reworking is carried out on an exchange basis"
Who wrote that?
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Superlite Ltd.
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Registered: 9th Jan 07
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courtney sport
so obviously its rather bias
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Vaux Lad
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Registered: 15th Dec 04
Location: Stoke-on-Trent
User status: Offline
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quote:
Originally posted by Superlite Ltd.
so obviously its rather bias
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ad-sport
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Registered: 16th May 07
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hey will, have you fitted this yet? i fancy 1 making if you get any power from it. let us no and like superlite said you could make a few quid on them
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Will94
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Registered: 1st Nov 02
Location: Nr. Ipswich, Suffolk
User status: Offline
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I wanted it fitted ages ago, but i'm off to spain this fri so aint got round to it yet lol
As soon as its on i'll post wit results.
Just hope it idles ok, if the butterfly hasnt sealed in the bore all that well it might b tetchy. Suck it n c!
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Vaux Lad
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Registered: 15th Dec 04
Location: Stoke-on-Trent
User status: Offline
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quote:
Originally posted by Will94
Just hope it idles ok, if the butterfly hasnt sealed in the bore all that well it might b tetchy. Suck it n c!
If it idles high, the ecu should close the idle motor a bit more until its happy with the idle speed.
It will be fine, unless it closes the motor completely, and it still idles too high, then it'll bring the ecu light on.
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Superlite Ltd.
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Registered: 9th Jan 07
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Just got myself a 64mm throttle plate from a vectra x25xe
Wonder what the bore is on an AGG engine?
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Will94
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Registered: 1st Nov 02
Location: Nr. Ipswich, Suffolk
User status: Offline
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Got it fitted. No running problems whatsoever, idles fine and runs fine. Induction roar is a bit louder with a very aggressive sucking sound and the exhaust has taken on a bit more of a "bark"
Throttle is even more responsive, and seems to run a bit more freely at the higher revs. Guess coupled with the mantzel it works well
Worth doing chaps!
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