Throttle Body Porting... - Corsa Sport - for Vauxhall and Opel Corsa B, Corsa C and Corsa D

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chris_uk

Premium Member

Registered: 8th Jul 03
User status: Offline

1st Apr 08 at 17:47

thought i would give it a go

im in the process at the moment of just cleaning it up a little.. you know, making it all nice and sparkley.

so i took it off the top didnt look that bad, quite clean.. the underneath on the other hand.. well... very very sooty.. no not sweep sooty..

here are some pics..

The dirty side, i had to scratch this off..

clean side

here is the lip im assuming you mean we have to take off, you cant see it very well tho

the cleaning, before

and after on the other side, not attempted the butterfly valve yet.

i will have to buy a dremel or something similar to do that actual porting tho..

EarlofBarnet

Member

Registered: 26th Mar 04
Location: West Cumbria
User status: Offline

1st Apr 08 at 18:54

Don't think you'd get a decent circular profile using a dremel. Would it not be better to get some kind of large abraisive circular drill bit to go right through the TB to get a consistant size right through? Then get a larger butterfly to suit the enlarged size?

Loved the polished finished around the TB though, looks ace

[Edited on 01-04-2008 by EarlofBarnet]

chris_uk

Premium Member

Registered: 8th Jul 03
User status: Offline

1st Apr 08 at 19:06

a coupe of the lads on z22se.co.uk have used a dril bit and i suspect that it should work ok, aslong as i take my time..

the full throttle body will look like that when i have finished tonight..

EarlofBarnet

Member

Registered: 26th Mar 04
Location: West Cumbria
User status: Offline

1st Apr 08 at 20:34

I'd just be extremerly careful when 'porting' around the butterfly. If you take off even a tiny bit too much then air will pass the TB even when it is closed (ie. when you're off the throttle/idle etc). This might confuse the ECU as more air will be coming in to the inlet manifold than it thinks should be.

Robin

Premium Member

Registered: 7th Jan 04
Location: Northants Drives: Clio 182 Cup
User status: Offline

1st Apr 08 at 20:37

I'd be amazed if you see any gains, or feel any difference Chris.

Paul_J

Member

Registered: 6th Jun 02
Location: London
User status: Offline

1st Apr 08 at 20:44

quote:
Originally posted by Robin
I'd be amazed if you see any gains, or feel any difference Chris.

Cleaning it is a good idea tho, but i agree with robin. not worth the effort.

Superlite Ltd.

Member

Registered: 9th Jan 07
User status: Offline

1st Apr 08 at 21:19

I did mine with a dremel tool

Probably hasn't made a blind bit of difference but it was a little afternoon project

Is the Z22SE fly by wire then? Infact, are all the Z prefix engine fly by wire now?

You might as well do it Chris, providing you don't spend loadsa money doing it. Even more so if your thinking about bolting a blower on it

chris_uk

Premium Member

Registered: 8th Jul 03
User status: Offline

1st Apr 08 at 21:58

you dont realise until you feel it just how much alu there is stopping air blockage..

here is a before and after of someone elses

after

I finished polishing it up.. not even touched it with a dremel yet tho..

here are the pics

and i cleaned up the alu bells aswell

before

after (yes its the other side but it looked the same)

[Edited on 01-04-2008 by chris_uk]

Robin

Premium Member

Registered: 7th Jan 04
Location: Northants Drives: Clio 182 Cup
User status: Offline

1st Apr 08 at 22:03

Yeah, but unless you increase the size of the throttle butterfly, the restriction is still there. It'll only be as good as the smallest part, making the path through smoother will help slightly, but it's always going to bottleneck.

chris_uk

Premium Member

Registered: 8th Jul 03
User status: Offline

1st Apr 08 at 22:12

of cause robin i agree.. but you can have a certain size hole with shite in the way (ie throttle body standard) and then clean all the shit away (ported throttle body) then the airflow is more direct..

some of the lads have put on 68mm throttle bodies but have had problems with the ammount of air going into the system causeing rough idles and EML lights..

id rather not have that but know that i have modified the 58mm one to the best it can be.

i am also putting the 2.4 inlet manifold on the car and with the ported TB ppl have noticed UPTO 20bhp on some engines with a slight drop of torque and a much better throttle responce and freer revving..

its worth doing

Dave A

USER UNDER INVESTIGATION - DO NOT TRADE

Registered: 10th Dec 03
Location: County Durham
User status: Offline

2nd Apr 08 at 09:11

I have done the inlet manifold swap on a customers car, gave decent gains higher up the revs but lost more than he had gained lower down.

Ryk

Member

Registered: 27th Mar 06
Location: Whalley, Lancs!
User status: Offline

2nd Apr 08 at 09:29

How's mine look??

chris_uk

Premium Member

Registered: 8th Jul 03
User status: Offline

3rd Apr 08 at 08:08

dave, i have heard that you loose some torque and gain BHP.. but on the whole a worthy mod.

a lads results from z22se

200cell cat
No precat
Custom backbox
K&n filter

Maximum Power -Engine 152.4 bhp @ 5419rpm
Maximum Torque 157.2 lbf.ft @4287 rpm

As Above with 2.4 Inlet fitted

Maximum Power - Engine 172.4 bhp @ 6565rpm
Maximum Torque- 149.5 lbf.ft @ 5120

chris_uk

Premium Member

Registered: 8th Jul 03
User status: Offline

3rd Apr 08 at 08:09

thats a 20hp peak gain from the changing inlet alone :groupjump:, the dyno tech mentioned right away that the car was pulling straight to the limiter and that the fueling was perfect thumbsup The graph also shows nice smooth lines all the way though the rev range

before the mani.

after

[Edited on 03-04-2008 by chris_uk]

chris_uk

Premium Member

Registered: 8th Jul 03
User status: Offline

3rd Apr 08 at 08:13

please bear in mind these graphs were not done with a remap..

bolt off bolt on and rr'd

i would be getting a stage2 remap from courtney or tms.

Superlite Ltd.

Member

Registered: 9th Jan 07
User status: Offline

3rd Apr 08 at 08:16

Thats very shiney Ryk

c20xe throttle bodys look like an egg

Stu_22

Member

Registered: 25th Mar 02
Location: Luton
User status: Offline

3rd Apr 08 at 08:44

Ive just done a bit of work on my corsa throttle body

Before

chris_uk

Premium Member

Registered: 8th Jul 03
User status: Offline

3rd Apr 08 at 08:52

i dont know what your cars are like to mine but too much air can cause problems..

chris_uk

Premium Member

Registered: 8th Jul 03
User status: Offline

5th Apr 08 at 12:39

well... its done.. i jsut need to get some countersunk screws to make the most of the porting but its done, and the throttle responce is better i would say..

pcis and vids coming.

fazza

Member

Registered: 7th Feb 08
Location: Plymouth
User status: Offline

5th Apr 08 at 12:50

what are you guys using to polish these?
can i get a bigger inlet for my c20xe

chris_uk

Premium Member

Registered: 8th Jul 03
User status: Offline

5th Apr 08 at 13:42

i just used a dremel.. with a polishing bit.. but i used the sanding wheel to take off the metal then i used 800grit W&D to make it smooth

chris_uk

Premium Member

Registered: 8th Jul 03
User status: Offline