[Mk2] [Turbo] rev 2 head. Change cams or head

phil-p · Post by **phil-p** » Mon Jan 14, 2008 12:32 am

I am after a little bit more power and wondering about chanding either the cams or to a rev 3 head from a rev 2. But not sure what is better. Could anyone tell me what they think

Cheers Phil

jimGTS · Post by **jimGTS** » Mon Jan 14, 2008 2:14 pm

head i believe is better on the rev2...
inlet camshaft better on the rev3 (exhaust cam the same)...
rev3 inlet manifold and TB slightly larger on rev3....

so ideal world, IMO, custom build a plate to fit the rev3 inlet manifold and tb onto a rev2 head, and fit a rev3 inlet camshaft...(or obviouslyget more aggressive camshaft)

phil-p · Post by **phil-p** » Mon Jan 14, 2008 9:23 pm

cheers. i will have a go at doin that.

Cheers Phil

dai21t · Post by **dai21t** » Tue Jan 15, 2008 10:28 am

What about a rev3 throttle body on a rev2 manifold?

Bit like the one I made for my car:

to compare the 2:

jimGTS · Post by **jimGTS** » Tue Jan 15, 2008 10:38 am

dont really see the point...

the rev3 manifold goes into 4 large bore holes and will flow just that bit more...
reason for 8 holes is the tvis, no tvis on the rev3s, so just make a custom adpater to fit the rev3 manifold onto the rev2 head....

dai21t · Post by **dai21t** » Tue Jan 15, 2008 11:59 am

Tried making an adaptor, was nowhere near good enough, was possible but didn't think it would work very well. I've put a rev3 throttle body on mine as it's 6mm bigger plus the sock for my ST205 chargecooler will bolt straight on now. I've also got rid of the tvis on mine using an ATS racing adaptor plate.

jimGTS · Post by **jimGTS** » Tue Jan 15, 2008 12:31 pm

dai21t wrote:Tried making an adaptor, was nowhere near good enough, was possible but didn't think it would work very well. I've put a rev3 throttle body on mine as it's 6mm bigger plus the sock for my ST205 chargecooler will bolt straight on now. I've also got rid of the tvis on mine using an ATS racing adaptor plate.

yeh shame ats dont do gen2 to gen3 (rev1/2 to rev3) adpater plate!
i thought about that adpater before i put the car back together, but couldnt justify the cost....so just unscrewed the butterflies instead.
can i ask how much you payed for it?? was it sourced through sbits or ats directly??

dai21t · Post by **dai21t** » Tue Jan 15, 2008 12:52 pm

Think it was about £100 direct from ATS. Plus I got caught for just under £20 tax as well.

jimGTS · Post by **jimGTS** » Tue Jan 15, 2008 1:10 pm

its alot for what looks like a piece of wood, lol...

turbomax · Post by **turbomax** » Tue Jan 15, 2008 4:00 pm

the port spacing is diffrent so it wont work and thottle body is not 6mm bigger. having more air go in to the middle of these manifolds is a waste as it leans them out even more. mounting the thottle on the end is the only real safe option. if looking for more power this is one of the last things to worry about. the body is not the bottle neck in the system nothing a bit more boost or better flowing turbo cant sort out or downpipe etc. all the best max

jimGTS · Post by **jimGTS** » Tue Jan 15, 2008 4:34 pm

turbomax wrote:the port spacing is diffrent so it wont work

yes it will work as its been done with a decent custom adapter...
how well it works is a different story probably, lol.

dai21t · Post by **dai21t** » Tue Jan 15, 2008 5:04 pm

Leaning it out shouldn't be a problem. I've got 850cc injectors and a Link Xlem to go on, sure that'll cope with fuelling requirements. Just waiting for my GT3076 kit to arrive. Maybe if you've only got standard setup then maybe it would be a concern?

phil-p · Post by **phil-p** » Tue Jan 15, 2008 9:39 pm

how do i get rid of the tvis? can i do this with a stock ecu? i have heard a couple of things about doing it but still dont have a clue.

This is a bit irrelevant to the cams but how much power can the afm flow?

Cheers Phil

jimGTS · Post by **jimGTS** » Wed Jan 16, 2008 10:19 am

phil-p wrote:how do i get rid of the tvis? can i do this with a stock ecu? i have heard a couple of things about doing it but still dont have a clue.

This is a bit irrelevant to the cams but how much power can the afm flow?

Cheers Phil

the tvis is not a bad thing, its a good thing, so theres no reason at all you would want to remove it on the stock ecu.....
mines removed because i and others above have a standalone system that doesnt cater for the tvis (as ther ebased on the rev3 cars which dont have them as stock)....
am sure ive seen some very big numbers in the US still using the afm, but really your looking at limits of 300hp, as youll really need a stadnalone ecu to control your engine, and 99% of these ditch the afm (and tvis)...

cantfindausername · Post by **cantfindausername** » Wed Jan 16, 2008 2:35 pm

Surely there are easier ways of getting a bit more power than fvcking about with the head.

What have you got done to the car already?

phil-p · Post by **phil-p** » Wed Jan 16, 2008 9:49 pm

I have a celica gt4 st185. Its got a complete exhaust turbo back and decat. blitz air filter and bov, ebc at .7 bar. and a apexi safc and a hybrid ct20b. I just want to find out about what things to do with my engine because i am in 2 mind with what i want to do with it.

I will be getting soon a emanage, but need to work out how to fit this or if i can cos its for the rev 3. and a 205 cc.

idealy i want a link g3 but cant afford it at the mo, this is why i am in 2 mind about what i am doin.

How much boost can a stock hg run?

Cheers Phil

paul t · Post by **paul t** » Wed Jan 16, 2008 10:20 pm

turbomax wrote:the port spacing is diffrent so it wont work and thottle body is not 6mm bigger. having more air go in to the middle of these manifolds is a waste as it leans them out even more. mounting the thottle on the end is the only real safe option. if looking for more power this is one of the last things to worry about. the body is not the bottle neck in the system nothing a bit more boost or better flowing turbo cant sort out or downpipe etc. all the best max

They are 6mm bigger and what you have said there about that not working is a lot of c""p as i have been working on cars {thats my job}for the past 14 years by the sound of it you just read things off the net

cantfindausername · Post by **cantfindausername** » Thu Jan 17, 2008 10:45 am

phil-p wrote:I have a celica gt4 st185. Its got a complete exhaust turbo back and decat. blitz air filter and bov, ebc at .7 bar. and a apexi safc and a hybrid ct20b. I just want to find out about what things to do with my engine because i am in 2 mind with what i want to do with it.

I will be getting soon a emanage, but need to work out how to fit this or if i can cos its for the rev 3. and a 205 cc.

idealy i want a link g3 but cant afford it at the mo, this is why i am in 2 mind about what i am doin.

How much boost can a stock hg run?

Cheers Phil

0.7bar through a hybrid CT20b? Whack that up to 1.1 bar and you'll notice a difference and it'll be a hell of a lot cheaper than modifying the head.

turbomax · Post by **turbomax** » Thu Jan 17, 2008 1:03 pm

yeah paul i do just read things off the net thats why i cant belive you are running 87mm pistons

is 14 years in a garage supposed to impress me. i have taken my cars to them as a last resort before and normally you get a half wit who ends up breaking it even further

. mind you if a tyre fitter calls him self a mechanic now whats the world coming to. i have been fixing my own cars for the last 15 years and use the internet to fault find all the time now and its a god send. out of intreast what size is the rev1 2 thottle body? and the rev 3 one please?

turbomax · Post by **turbomax** » Thu Jan 17, 2008 1:21 pm

even with big injectors you can still lean out unless you get a egt gauge that reads all four ports you cant tell 100% maybe with certian ecu you might be able to alter duties on middle two injectors. this leaning out is not going to effect the car on a trip to the shops but hard use around a race track this does happen. as my friend found out at the annual gt4 trackday. if toyota thought it was so great to use a center feed why change it on the st215? nearly every decent turbo car uses end feed iirc trd make a end feed intake. its just my comments after spending a lot of time and money on building my car i dont want to leave anything to chance.

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[Mk2] [Turbo] rev 2 head. Change cams or head

[Mk2] [Turbo] rev 2 head. Change cams or head

Re: [Mk2] [Turbo] rev 2 head. Change cams or head

Re: [Mk2] [Turbo] rev 2 head. Change cams or head

Re: [Mk2] [Turbo] rev 2 head. Change cams or head

Re: [Mk2] [Turbo] rev 2 head. Change cams or head

Re: [Mk2] [Turbo] rev 2 head. Change cams or head

Re: [Mk2] [Turbo] rev 2 head. Change cams or head

Re: [Mk2] [Turbo] rev 2 head. Change cams or head

Re: [Mk2] [Turbo] rev 2 head. Change cams or head

Re: [Mk2] [Turbo] rev 2 head. Change cams or head

Re: [Mk2] [Turbo] rev 2 head. Change cams or head

Re: [Mk2] [Turbo] rev 2 head. Change cams or head

Re: [Mk2] [Turbo] rev 2 head. Change cams or head

Re: [Mk2] [Turbo] rev 2 head. Change cams or head

Re: [Mk2] [Turbo] rev 2 head. Change cams or head

Re: [Mk2] [Turbo] rev 2 head. Change cams or head

Re: [Mk2] [Turbo] rev 2 head. Change cams or head

Re: [Mk2] [Turbo] rev 2 head. Change cams or head

Re: [Mk2] [Turbo] rev 2 head. Change cams or head

Re: [Mk2] [Turbo] rev 2 head. Change cams or head