and then polished

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

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

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.

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

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


Before

Thats very shiney Ryk :D

c20xe throttle bodys look like an egg :cool:

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.

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]

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

How's mine look?? :D :P

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.

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

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.

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]

I did mine with a dremel tool :D

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

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 ;)

quote:

---

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

---

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

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.

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..

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 :thumbs:

[Edited on 01-04-2008 by EarlofBarnet]

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..