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Author Freeing up power in a GSI..................
Meat-Pie-SRI
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Registered: 10th Apr 02
Location: Berkhamsted, Drives Mk4 R32
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11th Jul 03 at 17:45   View User's Profile U2U Member Reply With Quote

best ways to do it pleeeeaassseeee!

thanky doo

chris
dousey
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Registered: 21st May 03
Location: Selsey, West Sussex
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11th Jul 03 at 19:15   View User's Profile U2U Member Reply With Quote

Probably an inlet manifold, goof for 20+bhp. Look at lexmaul, mantzel powerbox and velos torq tube. Costs from £400 to about £575
2.5corsaV6
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Registered: 17th Mar 03
Location: Ilford Essex
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11th Jul 03 at 20:24   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by dousey
Probably an inlet manifold, goof for 20+bhp. Look at lexmaul, mantzel powerbox and velos torq tube. Costs from £400 to about £575


do these have a web site to go to??
dousey
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Registered: 21st May 03
Location: Selsey, West Sussex
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11th Jul 03 at 20:55   View User's Profile U2U Member Reply With Quote

Yeah,
Lexmaul - www.pvdnet.co.uk
Velos - www.vmotorsport.fsnet.co.uk
Mantzel - www.courtenaysport.co.uk

2.5corsaV6
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Registered: 17th Mar 03
Location: Ilford Essex
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11th Jul 03 at 21:11   View User's Profile U2U Member Reply With Quote

cheers dousey
dousey
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Registered: 21st May 03
Location: Selsey, West Sussex
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11th Jul 03 at 21:14   View User's Profile U2U Member Reply With Quote

No worries
2.5corsaV6
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Registered: 17th Mar 03
Location: Ilford Essex
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11th Jul 03 at 21:24   View User's Profile U2U Member Reply With Quote

wouldnt it b much easier jus to get a turbo??
u get much more power gains!!

by the way, if u fit a 2.0 lit turbo in a corsa B would the gearbox change to 6gears??
dousey
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Registered: 21st May 03
Location: Selsey, West Sussex
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11th Jul 03 at 21:40   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by 2.5corsaV6
wouldnt it b much easier jus to get a turbo??
u get much more power gains!!

by the way, if u fit a 2.0 lit turbo in a corsa B would the gearbox change to 6gears??


Would be talking a lot of money. If you took it to somewhere like courtenay sport they will charge you a few grand for it! Not to mention the insurance. So no, it wouldn't be easier to drop in a turbo lump. The turbo engine would come from a cav or calibra. I am not sure if these cars have 6 gears. If not you would have to pay a good few hundred for the 6 speed box.
kerzo
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Registered: 10th Nov 02
Location: Norn Iron
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11th Jul 03 at 21:43   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by 2.5corsaV6
wouldnt it b much easier jus to get a turbo??
u get much more power gains!!

by the way, if u fit a 2.0 lit turbo in a corsa B would the gearbox change to 6gears??


you may get more power gains with a turbo but you will spend a lot more and it will be less reliable and you may need to uprate the internals.

the gearbox for the C20LET is an F28 which has 6 gears but i think you can use an F20 but not sure on that which is a 5 gear
BeArDy
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Registered: 7th Aug 00
Location: Manchester
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11th Jul 03 at 21:51   View User's Profile U2U Member Reply With Quote

yes u can use a F20 box with the turbo lump which save u alot of money on parts as its not a basic fit like the F20
2.5corsaV6
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Registered: 17th Mar 03
Location: Ilford Essex
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11th Jul 03 at 23:21   View User's Profile U2U Member Reply With Quote

but if u want good amounts of BHP it would cost loads 2 get all the parts listed = mantzel powerbox, velos torq tube, inlet manifold
dousey
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Registered: 21st May 03
Location: Selsey, West Sussex
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11th Jul 03 at 23:28   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by 2.5corsaV6
but if u want good amounts of BHP it would cost loads 2 get all the parts listed = mantzel powerbox, velos torq tube, inlet manifold

And a turbo engine conversion would be cheaper?
2.5corsaV6
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Registered: 17th Mar 03
Location: Ilford Essex
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11th Jul 03 at 23:35   View User's Profile U2U Member Reply With Quote

kno but u get more BHP and might as well go the whole way and save up abit longer. at least u wuld be some wot more satisfied about the amount of bhp u have
BeArDy
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Registered: 7th Aug 00
Location: Manchester
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12th Jul 03 at 01:28   View User's Profile U2U Member Reply With Quote

for most BHP per pound your will never beat a 2lt 16v
miles
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Registered: 25th Mar 02
Location: plymouth Drives: Astra Sport
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12th Jul 03 at 10:18   View User's Profile U2U Member Reply With Quote

Yes you will. 2.0 8v.
Tom
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Registered: 3rd Apr 02
Location: Wirral, Merseyside
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12th Jul 03 at 14:54   View User's Profile U2U Member Reply With Quote

If you got enuf money get sbd t/b kit for your gsi kewl
luca2020
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Registered: 26th May 02
Location: Maidstone, Kent
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12th Jul 03 at 18:12   View User's Profile U2U Member Reply With Quote

C20LET + F28 gearbox and fitted will cost 2.5k+, but places like courtny will charge 5k!!! lol

Turboing a gsi is unreliable, and costs 3k. u get about the same bhp as TBs, but u get alot more tourqe

TBs are very reliable, SBD jobbies cost about 2k, fitting depends on weather u do it ur self, get a mate or a garage to do it

Then u got the powerbox's e.g. velos, manzal, lexmaul - around 400-550, fitting again depends on weather u do it ur self, a mate or a garage

Miles - how much BHP does the 2.0 8v have. and how much for a conversion?
Gary GSi
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Registered: 30th Oct 02
Location: Lincoln
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12th Jul 03 at 18:30   View User's Profile U2U Member Reply With Quote

If you can fit stuff yourself for the same price as a conversion you can get the same BHP as a C20XE.
You need a mentel power box,Get rid of the whole standard exhaust system and get a lexmaul manifold,De-cat pipe and group A centre and back box, An adjustable fuel pressure regulator, At least stage 2 head work and a superchip to put the rev limiter up to about 7500RPM. And if you have any spare cash an oil cooler is worth the money.
miles
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Registered: 25th Mar 02
Location: plymouth Drives: Astra Sport
User status: Offline
12th Jul 03 at 21:25   View User's Profile U2U Member Reply With Quote

2.0 8v's have 115 or 130bhp.

You can buy a whole cavalier with one of those engines in for about £100, then you have the brakes and other bits to sell as well.....

Fitting, depends who does it, engine mounts are cheap I believe and you could probably use standard shafts.... or might need to change the hubs I think....
MoNkEy MaGiC
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Registered: 12th Apr 03
Location: West - London Drives: Corsa GSi
User status: Offline
   12th Jul 03 at 21:34   View User's Profile U2U Member Reply With Quote

yea ive heard a lot about these inlet manifolds and the amount of power and torque they can free up is Mad!!! coudnt believe how restricted these engines were!

ive been thinking of getting a inlet manifold for my gsi,and correct me if im wrong guys but i reckon the mantzel powerbox is the best so far, only thing stopping me is the insurance! what they gonna say when i tell em my cars got another 20BHP under the bonnet! how much more will the premium go up by u reckon???
luca2020
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Registered: 26th May 02
Location: Maidstone, Kent
User status: Offline
13th Jul 03 at 12:03   View User's Profile U2U Member Reply With Quote

yer u can tune a gsi to around 150bhp for the price of a 2.0 conversion, but u will get nowhere near the tourqe that the 2.0 produces, and tourqe as we all know well is the key to speed
mikeytigra
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Registered: 7th Jul 03
Location: chester
User status: Offline
13th Jul 03 at 13:50   View User's Profile U2U Member Reply With Quote

also fit a power boost valve it will help in the mid range power
Akeemking
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Registered: 25th Nov 01
Location: Azeitão, PORTUGAL
User status: Offline
23rd Sep 03 at 22:25   View User's Profile U2U Member Reply With Quote

fuk that
go for OMEGA/LOTUS 3.6 Biturbo engine

just kidding
1.6 16V or 2.0 16V and SBD TBs and Gr.A exhaust... i would if i didnt had a LET
Paul_J
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Registered: 6th Jun 02
Location: London
User status: Offline
23rd Sep 03 at 22:37   View User's Profile U2U Member Reply With Quote

err... straying from the subject a bit?

All this guy wants is to free up some power - a cheap way of doing this is to get one of these inlet mainfolds, listed above...

they're pretty cheap £300-£500

and taking your gsi to say 126ish bhp aint bad for only £300 quid.

The guy that keeps just saying 'it'd be cheaper to chuck a turbo in' - what the F*ck?

looking at what £3000 ... then insurance on top.

Not everyone has that much money, this guy just wants a cheap way to get a bit more performance thats all!
broster
Premium Member

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Registered: 6th Dec 02
Location: Drives: E39
User status: Offline
24th Sep 03 at 07:04   View Garage View User's Profile U2U Member Reply With Quote

to gain more power foller these steps:-
1, get ur new coilovers
2, give old ones to me
3, my car will be drivable again above 40mph an will go straight when i brake!
4, buy a new inlet, tbs etc!
lol :-)
seriously tho it all depends on ur budget dont it, i mean if u have 1.5K get a 2ltr if u only want an extra few bhp get a new zorst, maily for noise! and get a new inlet, then try a exhaust manifold an de-cat and then uni chip with raised limit

 
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