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About LinkBackshey guys im rebuldin my 20seh in teh next few weeks n wonderin wot mods would work well on it. how woul dthese mods suit it n wot else do u think i shuld do:
fast road cam
higher compression
lighten flywheel
chip??
ne other ideas guy??
hey guys im rebuldin my 20seh in teh next few weeks n wonderin wot mods would work well on it. how woul dthese mods suit it n wot else do u think i shuld do:
fast road cam
higher compression
lighten flywheel
chip??
ne other ideas guy??
port, polish and gas flow the head. but if you have that done make sure the place you take it has a flow bench!
would that give good gains? i already have a 4branch so take it would work well with it
They sound like very sensible mods!Originally Posted by keggy
As Matt says, a port and a polish would help it breathe a bit easier, and maybe some more free flowing manifolds would just finish the job off nicely.
Teeth? LUXURY! When I was a child we ate by putting rocks in our mouth and jumping up and down.
for the flywheel shul di just get 1 skimmed r would i be better wid buying 1? ne other ideas on mods
Stock head flows enough air for 140-145hp with a cam that has 0.500" lift or more at the valve. Porting it is a waste of time in my experience if your keeping the stock intake and especially the stock, flap type, airflow meter - these are the real restriction.
If you have to keep the stock intake manifold I'd hunt out a Mk3 Astra SRi. These had a 2L 8v engine. The injection system on that came with a air mass meter (same type as the 2.5 V6 just smaller in bore). These flow more air than the older flap type airflow meter. Use the complete engine loom and ECU with the AMM and fit to your engine.
Then you can use your mods above. A aluminium underdrive pulley from TTV racing would also help, as well as the usual K&N (with cold air feed) + straight through 2.25-2.5" exhaust.
If you buy a exhaust manifold, speak to the exhaust manufacturer and tell them your cam specs i.e timing events (IVO, IVC, etc.). They may adjust the primary lengths to suit your cam for better scavenging.
oh alloy pulleys? much? and website at all?
curiosity killed the cat...................but for a while i was a suspect!!
so i can just swap over teh inlet manifold of a mk3 2.0 8v astra? how would the ecu caffect the running of teh engine comparred to the ecu i got in now?
you wont have the plug for the amm and you cant just wire it up because the ecu wont except it. the only way is too have the ecu and wireing off the astra sri, the running will be the same because your not changing anything else as long as the wireing is done right.
ok thanks
was about to start some mods on mine and was gonna get rid of the inlet system what gains could be had from putting bike carbs on because webers and throttle bodies are well to expensive dont want to turbo just want some raw power
If your talking SEH get the head done, 150hp+ is possible with no other mods! Quite expensive tho
i will get that done then and get the exaust size matched to the ports how much is it to get the head done? my dads mate does it so will get them to do it just after a rough price
Regarding the mk3 astra bits, which btw was fitted with the lower bhp c20ne engine, I can't see how you can use the loom and ecu etc off the c20ne and fit it to a 20seh as they're different engines internally and have different compression ratio's as you'll know
Managing Director - Severn Developments Ltd
Regarding the mk3 astra bits, which btw was fitted with the lower bhp c20ne engine, I can't see how you can use the loom and ecu etc off the c20ne and fit it to a 20seh as they're different engines internally and have different compression ratio's as you'll know
thats wot ive been wondering aswell?? it is bound to be differently mapped? maybe this mod and a remap would be the way to go
i got bigger inlet valves, ported, skimmed and cleaned for 450 iirc
I'm glad I read this, I'm gettin a 2l engine on wednesday and I believe its the 20seh and want to tune it before I throw it into the space currently occupied by the c18ne donkey thats in my cavvy
http://www.ttvracing.com/
Contact them. They can do a custom pulley to your requirements too, i.e. underdrive power steering pump but with stock alternator ratio.
Yes you can use the loom and ecu. A 0.8 increase in compression ratio and slightly revised cam timing events doesn't make for a completely different engine internally!Regarding the mk3 astra bits, which btw was fitted with the lower bhp c20ne engine, I can't see how you can use the loom and ecu etc off the c20ne and fit it to a 20seh as they're different engines internally and have different compression ratio's as you'll know
If you get an "off the shelf" chip it still won't be optimally tuned for your modifications. The only way to tune the stock ecu properly is to remove the stock chip, attach a laptop running a emulator then live map it on the dyno. Once that is done a proper chip can be burned with the new map and installed into the ecu.
Yes ok, but I still can't see how using an ecu off a 115bhp engine will do anything for a 130bhp engine, I mean, will it even work??
P.S Pistons are different too
Managing Director - Severn Developments Ltd
i had a mark 3 astra sri which was supposed to have the c20ne engine , the previous owner removed it and put a 20seh engine from a cavalier sri130 into it, it worked well, i had it for over 2 years and never had a problem with it. i would definitely recommend it.
That's how we got them in South Africa:
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