[Mk2] [Turbo] TVIS gutting? rev2 car, with rev3 ecu...

[jimGTS]

couldnt find much in the search unfortunatly given the fact ive a rev2 car with rev3 ecu.....

what are the advantages and disadvantages of doing this?
the primer power says on a modded engine, its not ideal...and given the fact the rev3 doesnt have TVIS?? (am i correct), how would this now work on my car??

tar

[MR2lover]

With a rev3 conversion the valves would be constanly open, though at your power levels jim i would not bother taking out the butterfly runners as it only becomes a tiny restristion at 300rwhp. YOu will not notice any more bhp from removing trust me i did it and is a pain in ar$e job.

Best bet is fitting a rev3 inlet manifold and then rev3 tb on rev2 head but you need to make a custom adpator like i have. Damn good mod tho

[MR2lover]

Also is a good mod for engines with mild head mods as the rev2 head will flow more air than rev3 as standard the rev3 will flow more due to different intake cam but if a rev3 intake cam or other cams are fitted then a rev2 will flow more due to the larger intake ports and tapered design. Then put on the better flowing rev3 manifold / TB and your flying

[jimGTS]

so rev3 cams, and rev3 intake manifold/tb...

how viable are these parts to source..maybe something to think about.....so fitting these would flow more than a rev3 due to the rev2 head design, that what your saying?
adapter, not something off the shelf i take it? custom made?

[MR2lover]

so rev3 cams, and rev3 intake manifold/tb...

how viable are these parts to source..maybe something to think about.....adapter, not something off the shelf i take it? custom made?

The throttle body and intake manifold can be quite easy to source but rev3 cams are sometime difficult but tbh if you going to fit rev3 cams i would get some hks ones in there, I just couldn't afford them when i had engine built so went with rev3 intake which i had spare

Adaptor is custom job but might be able to help you out with it in future

so fitting these would flow more than a rev3 due to the rev2 head design, that what your saying?

[hairyhoover1]

does this better head design go for a rev1 as well?

[MR2lover]

yup

[[SiG]]

Jim a good value cam-upgrade is the HKS 256-Inlet which will pair well with the 236-exhaust you already have. Any bigger a gap & you have to upgrade the exhaust one too (got that from Tim)

Si

[arman]

I thought inlet manifolds werent interchangeable between rev 2 n rev 3 heads

[Peter Gidden]

Had a long chat about TVIS gutting with ATS. In their opinion it is of benefit until the 400BHP ish mark, and from then onwards it becomes a restriction.

I have a couple of phenolic spacers coming over from ATS that replace the TVIS plate and insulate the inlet manifold from the cylinder head.

[3sgte]

Had a long chat about TVIS gutting with ATS. In their opinion it is of benefit until the 400BHP ish mark, and from then onwards it becomes a restriction.

I have a couple of phenolic spacers coming over from ATS that replace the TVIS plate and insulate the inlet manifold from the cylinder head.

so how does ats use tvis up to 400bhp , we would have lost our toyota ecu way before then , didn't know aftermarket ecu's can control tvis

[Peter Gidden]

Had a long chat about TVIS gutting with ATS. In their opinion it is of benefit until the 400BHP ish mark, and from then onwards it becomes a restriction.

I have a couple of phenolic spacers coming over from ATS that replace the TVIS plate and insulate the inlet manifold from the cylinder head.

not quite understanding that peter , is it good up to 400bhp to gut the tvis , or only useful after 400bhp

Good to have it up to 400 ish, apologies.

[Peter Gidden]

Had a long chat about TVIS gutting with ATS. In their opinion it is of benefit until the 400BHP ish mark, and from then onwards it becomes a restriction.

I have a couple of phenolic spacers coming over from ATS that replace the TVIS plate and insulate the inlet manifold from the cylinder head.

so how does ats use tvis up to 400bhp , we would have lost our toyota ecu way before then , didn't know aftermarket ecu's can control tvis

MSD rev operated switch - variable switching at anything between 2k and 6k. Got a couple here- work fantastic!

[Al-sw20]

didn't know aftermarket ecu's can control tvis

Unless you are using an abacus for an aftermarket ecu, they ALL should be able to control tvis. Its a simple on off design that can be controlled with a rpm or pressure switch.

[cantfindausername]

Here's my gutted TVIS....


Was originally going to use it as a base for my custom manifold, but will be readdressing this when I get round to doing more work on it.