18 replies to this topic

[EJ22D]

Dear anyone who finds interest in this post,

I have an infinite interest in the idea of DOHC EJ22s. Having built 2 already in N/A form, I now move onto the turbo realm & seeing as EJ20Rs & EJ208s can be had for relatively cheap, I am seriously contemplating a twin turbo DOHC EJ22 build. 

However, I have been told that the twin turbo powerplant is no good & to steer away due to the complexity of the twin turbo setup that Subaru uses & the fact that the ECUs that the twin turbos employ seem to be incapable of being tuned.

Can anyone with twin turbo experience chime in & inform me of the reality of the situation? I think it would be pretty awesome to have but if the ends do not justify the means, I will stick w/a single turbo build.

Thanks!

[alexGT]

Dear anyone who finds interest in this post,

I have an infinite interest in the idea of DOHC EJ22s. Having built 2 already in N/A form, I now move onto the turbo realm & seeing as EJ20Rs & EJ208s can be had for relatively cheap, I am seriously contemplating a twin turbo DOHC EJ22 build. 

However, I have been told that the twin turbo powerplant is no good & to steer away due to the complexity of the twin turbo setup that Subaru uses & the fact that the ECUs that the twin turbos employ seem to be incapable of being tuned.

Can anyone with twin turbo experience chime in & inform me of the reality of the situation? I think it would be pretty awesome to have but if the ends do not justify the means, I will stick w/a single turbo build.

Thanks!

 

this alone is enough to tell you it is a bad idea. it is just a poorly designed out-dated system. single turbo setup is better in every single aspect (cost, power, driveability)

[EJ22D]

Which of these heads would you personally choose for your turbo build & why?
EJ20K-EJ20R
EJ20G-EJ20H
EJ25D
EJ20D

[Cam.]

V8 STI or V6 STI heads.

[Mosti]

I've had my B4 for 7 years, put 120,000km on it and have never had an issue with the twin turbo setup *touch wood* Every car is different though

[Murf B4]

i've had my b4 3 years - 2 of those years its been single turbo - 

 

2.5lt - 99 sti heads gt35r - single turbo every time 

[allpaw4]

Had mine 6 or so years now. Done 50k km, and been through 3 motors. Now running single turbo, been running longer and more reliable. Stick with single man, especially when it's being built.

[migoreng]

Done 20,000km in mine. It's a great cruiser but i believe it needs a tune.

ill just service it on time and hopefully it should be fine in stock form.


ive been through this before with my old Honda prelude... bought with 170,000km and sold it with almost 300,000km 5 years latet. it was always reliable. Felt like it was going to make it to 400,000km easy...

maybe I should look for an aftermarket alarm system too to replace the brant. Lol...

[allpaw4]

2L block, 2.5 crank, and a set of V8 STi heads (for AVCS goodness) or 02 STi Spec C heads if you don't want AVCS. Build that up and away you go.

2.35L motor that will go crazy if built correctly.

[Murf B4]

Allpaw the 99/00 rex heads are large port - mine flowed to 400+ kws after port and cams

[Murf B4]

Target 9:1 and run big cams :lol::lol::lol::lol:

[JRod]

At Allpaw

EJ20 + 2.5 crank = 2.1xxx
EJ22 + 2.5 crank = 2.35

I'm going out on a limb here with my thought.

I was only speaking with Billsy about this the other night. 2.5 with twin TD04/5s. Need to have some wicked cams and plenty of headwork done. Low mount these suckers as close to the engine as possible. And the biggest thing a lot if you guys are forgeting is that twin turbos can be run in parallel too. Dont let the factory sequential system with all its valves and solenoids cloud your minds.

If I had the coinage to do a new big project I'd give it a go. For a track car, as long as the exhaust housings were correct for the motor, think of the instant boost you'd come onto out of the corners. That, is the trick to a good twin turbo system.

[Sic'Em]

 

Love the look of the twin turbo set up in this bug.

 

If you have the time/patience/money for a twin turbo set up... go for it.

[EJ22D]

Sic'Em, that WRX that is displayed seems to be a "Bi-Turbo" setup rather than a twin-turbo. I spent time researching the twin turbo system last night & decided that I would not pursue Subaru's sequential setup. It all looks like it will cause great headache to try & assemble, especially that black box. I would rather a bi-turbo setup any day of the week. Early TQ & it is carried over a wide rpm range. That seems like the ultimate balance for turbocharging. 

[Sic'Em]

^ Interesting... I would like to do that 'bi-turbo' set up on my WRX, it looks mean and I'm sure it would go like the clappers over the whole RPM range.

[allpaw4]

Ah, cheers for that, I did not realise it took the 2.2 block to get the higher figures. That said, I never crunched the numbers, just heard it from people. Thanks for the correct info!