and-m
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Registered: 5th May 02
Location: Liverpool. Drives. Skud vRS.
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I dont see how it can be. You are limited by the pipe.
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Mistamist
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Registered: 16th Jul 03
Location: Gillingham, Kent
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not sure if the intake on yours joff is slightly different design to mine,
from what i can make out, when the adapter is placed on top of the intake it essensially creates a chamber so air can still flow down the smaller butterfly as it opens earlier.
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Joff
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Registered: 17th Oct 00
Location: Cambridgeshire
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quote:
Originally posted by M15T XE
not sure if the intake on yours joff is slightly different design to mine,
from what i can make out, when the adapter is placed on top of the intake it essensially creates a chamber so air can still flow down the smaller butterfly as it opens earlier.
Ah, no mine's the same on the top - I now see what Miles was on about earlier.
When the base of the plate is flush against the top of the throttle body, there's still the cm or so inside the throttle body as it's tapered to each valve.
Still, modifying the SFi box or fitting a Powercap would give a larger plenum chamber than just having a pipe on the end of the throttle body.
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ed
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Registered: 10th Sep 03
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Even though the air can get to the first butterfly, it would take a lot more effort for it to get there - the adaptor plate is clearly designed to provide air for te larger butterfly. What you really want is the powercap in a Corsa. Your not cutting away any important bits when you fit it 
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Joff
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Registered: 17th Oct 00
Location: Cambridgeshire
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What you really want is the SFi box.
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Mistamist
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Registered: 16th Jul 03
Location: Gillingham, Kent
User status: Offline
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whats the benefit from one to the other? i was thinking of fittting the SFI box, but was told a powercap would give better performance but the adapter plate was the cheapest option.
as i was gonna attempt to make the adapter plate just thought what positive/negative effects would moving the hole into the centre of the adaptor plate have?
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ed
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Registered: 10th Sep 03
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An SFi box will give your engine a smooth torque delivery and hopefully not too many flat spots if you use a decent induction kit (think £150+) or if you manage to modify an airbox sufficiently for it to work. An Ecotec pipe and adaptor requires the least chopping of the bulkhead but there are issues with using one.
[Edited on 20-12-2004 by Ian]
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Joff
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Registered: 17th Oct 00
Location: Cambridgeshire
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Bhp gains from a Powercap are typically at the top end of the rev range, ie not useable.
People can't get enough of them though - they'll believe anything
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and-m
Member
Registered: 5th May 02
Location: Liverpool. Drives. Skud vRS.
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It requires no chopping. What issues are you referring to?
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Joff
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Registered: 17th Oct 00
Location: Cambridgeshire
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quote:
Originally posted by M15T XE
as i was gonna attempt to make the adapter plate just thought what positive/negative effects would moving the hole into the centre of the adaptor plate have?
You'd be better leaving the hole over the main valve - that's the one that has the greatest need for airflow, so forget about the smaller valve.
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Mistamist
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Registered: 16th Jul 03
Location: Gillingham, Kent
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anyone got a picture of a C20XE corsa with the SFI box fitted?
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Joff
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Registered: 17th Oct 00
Location: Cambridgeshire
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quote:
Originally posted by and-m
It requires no chopping.
Ecotec pipe still needs a trim of the sound deadening at the rear of the engine bay.
quote:
Originally posted by and-m
What issues are you referring to?
Little to no plenum chamber.
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Joff
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Registered: 17th Oct 00
Location: Cambridgeshire
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quote:
Originally posted by M15T XE
anyone got a picture of a C20XE corsa with the SFI box fitted?
Don't think it's going to happen... I'm sure the Nova still needs the SFi box to be butchered to fit.
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and-m
Member
Registered: 5th May 02
Location: Liverpool. Drives. Skud vRS.
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I guess that depends whether you have the deadening or not, mine didnt.
I have seen RR graphs with the ecotec pipe in place and the power output is fine.
Also the SFi box can fit in a Nova without modding (albeit a slight push in the firewall at the top).
To fit a Corsa it would need chopping, less so if yu get one of the later, smaller SFi boxes and re-fibreglassing.
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Joff
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Registered: 17th Oct 00
Location: Cambridgeshire
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Cool.. two types of SFi box! 
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lee gsi
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Registered: 21st Jun 02
Location: Portsmouth (Way down South)
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I take it everyone that is slating the power cap and other plate have done before and after rolling road plots?
It makes me laugh how everyone says this and that is crap without proof.
I did a back to back rolling road with the sfi, powercap and plate.
Powercap gained you about 5-10 ftlb of tourqe accross the rev range with NO flat spots and 4 bhp increase top end, and the plate gained about 3-6 ftlb of tourqe across the rev range but no extra power top end.
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Joff
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Registered: 17th Oct 00
Location: Cambridgeshire
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Rolling roads are bullshit bhp.
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AK
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Registered: 5th Jul 00
Location: Aberdeen City
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the power cap lowers the peak torque but spreads it higher up the rev's...... giving the increase in bhp...
I have an SFi box somewhere, and a powercap...... but i think stoneyginger has stolen that and chucked it on his car....
Solution.....
hack the back of the SFi box off, rebuild it with GRP.... 'adjust' your bulkhead to suit..... hey presto
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Joff
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Registered: 17th Oct 00
Location: Cambridgeshire
User status: Offline
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Solution.
http://www.qednet.demon.co.uk/
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AK
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Registered: 5th Jul 00
Location: Aberdeen City
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yup
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ed
Member
Registered: 10th Sep 03
User status: Offline
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quote:
Originally posted by lee gsi
I take it everyone that is slating the power cap and other plate have done before and after rolling road plots?
It makes me laugh how everyone says this and that is crap without proof.
I did a back to back rolling road with the sfi, powercap and plate.
Powercap gained you about 5-10 ftlb of tourqe accross the rev range with NO flat spots and 4 bhp increase top end, and the plate gained about 3-6 ftlb of tourqe across the rev range but no extra power top end.
A rolling road isn't proof. Proof is bench testing each of the set ups and testing the figures at the fly wheel. You can do loads of tricks to get customer satisfaction from a rolling road.
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AK
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Registered: 5th Jul 00
Location: Aberdeen City
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yes..... but....
The tests will be worthwhile if done back to back on the same rollers with the same settings
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Dan
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Registered: 22nd Apr 02
Location: Gorleston on Sea, Norfolk
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surely the suction caused by the pistons pulling the air in is powerful enuff 2 suck air in on the ecotch method??
obviously, it aint gonna b top notch, but air is always going 2 b avalible for the smaller butterfly??
in my eyes, cant c what difference can be made.
Adult GiftsClick here to vist us
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Joff
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Registered: 17th Oct 00
Location: Cambridgeshire
User status: Offline
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quote:
Originally posted by Dan
surely the suction caused by the pistons pulling the air in is powerful enuff 2 suck air in on the ecotch method??
obviously, it aint gonna b top notch, but air is always going 2 b avalible for the smaller butterfly??
in my eyes, cant c what difference can be made.
True, yet people still spend time removing the wedge from their butterfly and mesh from the air flow meter.
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AK
Member
Registered: 5th Jul 00
Location: Aberdeen City
User status: Offline
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the better the airflow.... the bigger/better the pissible combustion.... (more possible air)
There is a similar mod done to mkIV supras....
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