[Mk2] [Turbo] rev2 turbo to rev3 turbo conversion? help!

[aaron dean]

can somebody please give me some advice into what is the easiest and cheapest way to get rid of the AFM on my rev2 turbo? i have heard that people have converted their rev 2's into rev 3 spec engines and thus removing the afm but have no idea what i need to do this, any insight would be appreciated, thanks!!

[djpkins]

http://www.biststone.com/coyote-mr2/how ... ogen3.html

[aaron dean]

awesome! thanks for that, how come it says you have to use an apexi power fc? cant u just run the standard rev 3 ecu for a start?

[djpkins]

Yes...unfortunately I have just sold a full rev 3 conversion package...ecu, ait, map, mat etc but you should be able to pick up the parts for about £200, less if you shop around...expect to pay...

rev 3 igniter...£40
map sensor...£30
air intake sensor...£10
mat sensor...£30
rev 3 ecu...£100

....ish..lol.

[aaron dean]

does the rev 2 engine wiring loom need modifying in anyway then or is it really as simple as just buying these parts lol?

edit!! sorry just read the link lol, stupid question!

[castrolfan]

what's the benifit of this? im guessing more bhp???

im re-building a rev3 engine which i got rather than a rev2 as it makes more power but i have no idea how

[dantheman]

it removes the slightly restrictive air mass flow sensor from the system, which should create a small amount of power and slightly increased drivability.

the rev3 engine creates more power mostly due to the fact it runs 13-14psi boost stock compared to the rev2 10-11 psi stock. there were other changes between the engines such as throttle body size etc, but they probably only make 1-2hp difference between them. also rev3 has lower compression ratio because it runs more boost, as soon as you start modifying the the boost or engine internals the revision engine you are using as a starting base becomes somewhat irrelevant

[castrolfan]

oh ok, thanks

so could you take a rev2 engine and a decompression plate and run 14psi to make almost the same power as a rev3???

[dantheman]

if you put in a thicker head gasket and run 13-14psi on a stock rev2 setup you would be seeing about 240hp, same as rev3. of course if you dont reduce the compression ratio and you just install a boost controller and all that goes with doing so and up to 14psi, you will get more power from a rev2 than a rev3.

*im ignoring the effect of the CT26 vs CT20b

[castrolfan]

cool

so am i right in thinking that when i build up my rev3 if i stick to the standard HG and run 14psi it will make power than if i fit the thicker 1.4mm hks HG?

Does that also mean that if i fit the 1.4mm HG i can maybe run 15 or 16psi?

sorry aaron dean, didn't mean to jack your thread

[dantheman]

as a general rule the more boost you run the closer you get to detonation. to compensate you reduce compression ratio. so yes with the stock head gasket you will make more power at 14psi than with a 1.4mm one.

however i think you are ok on the stock head gasket for 16 psi or more before you get detonation problems i think its about 18psi, maybe more where det occurs with the stock head gasket, but im not too sure.

[jimGTS]

There are way more things to factor in with the rev3.
Head, cams improved, hg metal, pistons, ecu, injectors, fuel rail, tb, inlet manifold, oil filter location, basically a mass of things are improved on the rev3+ engines.

There are plenty of folk running 20-30psi on stock headgasket with a rev3+.

Reason I did the conversion on my old car was because I wanted it mapped on a standalone ecu. And all the best ecus are generally nicely bolt on to a rev3+ engine and electronics.
Hense why some converted.
My car personally ran crap with a rev3 Ecu (this is my old rev2 I'm talking about), wernt till I mapped on the standalone did the conversion become werth while.

But no point getting a standalone until you have some decent mods, ie turbo and fuel upgrade.

Sure a rev1/2 at 13/14psi will prob make same power as a rev3-5, however you start modding the gen3 and there's noway the gen2 will keep up past 260hp. Cams, fueling, head/manis, ecu have a big part to play why they are superier in general.

[castrolfan]

thanks for the info guys, very helpful