View Full Version : so ej25 twin turbo?
DCM-LEGACY
08-05-2010, 05:03 AM
ive been thinking lately about buying a used engine off a b4 rsk and throwing in a ej257 block, anyone think this would work or have any thoughts on the idea
chuckthefuk
08-05-2010, 10:17 AM
It will work but you have to convert to single turbo & usdm manifold. The twin turbo manifold wont clear the LHD steering rack.
The EJ20x heads will bolt up to the EJ257 block with no real issues.
Biggest problem here is the wiring.
-Chuck
BG5guy
08-05-2010, 03:29 PM
i 2nd chuck, the wiring is a nightmare, many shops in my area wont even attempt this project. i planned on doing this for my GT but to much hassle. it can be done, but a pain in the rear
anothernord
08-05-2010, 06:20 PM
I've heard of people using a custom downpipe that clears the steering rack. As far as I know, the stock downpipe is really the only issue.
DCM-LEGACY
08-06-2010, 04:30 AM
i was going to either use a rsk stearing rack or custom pipe the whole thing
chuckthefuk
08-06-2010, 09:58 AM
Its the location of the LHD steering rack + the twin turbo manifold that doesn't work.
Just use a USDM manifold w/ single turbo and you can keep your legacy steering rack.
-Chuck
Yamazaki
08-06-2010, 01:16 PM
Its the location of the LHD steering rack + the twin turbo manifold that doesn't work.
Just use a USDM manifold w/ single turbo and you can keep your legacy steering rack.
-Chuck
Well, then there's no point in using an EJ206/8. He might as well just get an EJ257.
chuckthefuk
08-06-2010, 01:38 PM
A full EJ257 DBW is not a fun install. EJ257 block and WRX/N/A heads is a better solution since u can mix and match and keep your cable throttle.
i agree with you Yamazaki no point to buy a full engine to just replace the block but meh!
-Chuck
EJ22E
08-07-2010, 06:39 PM
You can do it if you convert to RHD. This way the manifold clears. Its a lot of work but it can be done.
aekOne
08-09-2010, 02:36 AM
My question is why twin turbo?
if your going to all that trouble you really should be converting to single turbo anyway??? much more reliable and easier to achieve bigger power figures. Why don't you get an EJ208 and do a full rebuild on it, forged pistons, rods, head studs, gaskets etc then go single turbo. WRX headers, up pipe, dump, Vf24 etc. a much better use of your money and time in my opinions.
What's the goal from doing what you outlined above/what do you want from your car??
what your proposing with the EJ257/EJ206(8) twin turbo sounds like much more trouble than it's worth when there are better options available to you
Reuben
08-11-2010, 08:07 PM
Taking the LHD TT issue asside, and the wiring for USDM to JDM turbo aside also, and focusing on just the 2.5 TT... Yes totally possible. But your ONLY option with ECU's is to go with factory (or modified factory, which is only an option for D rev BE/BH's). Which means you are stuck with yellow 440cc injectors, which i'm not so sure will be able to handle 2.5L of twin turbo. Then you are also stuck with your turbo's, which are for a 2L, you'll change the spool characteristics entirely, and possibly even get ECU problems from it.
I'd say the only feasable option is to go with BH5D, which is phase 3, tunable, and comes with pink top feeds which flow more than yellows. But these are hard to find.
But i'm going to say the same as others in the thread. Don't fucking bother with that pile of fail that is twin turbo. Take from those who have actually driven them!!! Even yamazaki, who has the best TT of them all, the ever glorious S401, is wondering why you don't just go single turbo...
Moar tarbo's IS NOT BETTAR.
DCM-LEGACY
08-17-2010, 01:56 AM
My question is why twin turbo?
if your going to all that trouble you really should be converting to single turbo anyway??? much more reliable and easier to achieve bigger power figures. Why don't you get an EJ208 and do a full rebuild on it, forged pistons, rods, head studs, gaskets etc then go single turbo. WRX headers, up pipe, dump, Vf24 etc. a much better use of your money and time in my opinions.
What's the goal from doing what you outlined above/what do you want from your car??
what your proposing with the EJ257/EJ206(8) twin turbo sounds like much more trouble than it's worth when there are better options available to you
the whole point of the build is to do something different not really big numbers, the big numbers car is going the gdb im working on. and i would probably go with hydra or mega squirt for the ecu. the heads might be changed out for something else not sure quite yet i was just curious if the whole concept its self feasible
Yamazaki
08-17-2010, 02:29 AM
the whole point of the build is to do something different not really big numbers, the big numbers car is going the gdb im working on. and i would probably go with hydra or mega squirt for the ecu. the heads might be changed out for something else not sure quite yet i was just curious if the whole concept its self feasible
Why would you use a GDB for your "big numbers" car when you have GDFs there??
Sarra
08-17-2010, 03:36 AM
EJ257 Twin Turbo has been done before. It's really not worth it...
If you want twin turbo, get an EZ36, EZ30R crank, a shit freaking ton of money, two VF22 turbos, and build yourself a proper twin turbo motor.
Twin turbo H4 is just such a nightmare. I'd never do it in a million years. If I got one as a gift, I'd convert it, or shoot myself.
chuckthefuk
08-17-2010, 10:27 AM
i would probably go with hydra or mega squirt for the ecu.
Why would you go with megasquirt? Whats the point in programming an ecu when there are a handful of plug-n-play ecus that don't need 50+ hours to tune.
EJ257 Twin Turbo has been done before. It's really not worth it...
If you want twin turbo, get an EZ36, EZ30R crank, a shit freaking ton of money, two VF22 turbos, and build yourself a proper twin turbo motor.
Twin turbo H4 is just such a nightmare. I'd never do it in a million years. If I got one as a gift, I'd convert it, or shoot myself.
Cheaper to drop a Porsche 911/xx motor in :lol:
-Chuck
Sarra
08-17-2010, 03:36 PM
i would probably go with hydra or mega squirt for the ecu.
Why would you go with megasquirt? Whats the point in programming an ecu when there are a handful of plug-n-play ecus that don't need 50+ hours to tune.
EJ257 Twin Turbo has been done before. It's really not worth it...
If you want twin turbo, get an EZ36, EZ30R crank, a shit freaking ton of money, two VF22 turbos, and build yourself a proper twin turbo motor.
Twin turbo H4 is just such a nightmare. I'd never do it in a million years. If I got one as a gift, I'd convert it, or shoot myself.
Cheaper to drop a Porsche 911/xx motor in :lol:
-Chuck
Porsche engine? Don't they spin the wrong way? Maybe if you put the transmission in the trunk, and ran the output of the engine into the back of the transmission... Heh, you could run two engines that way. Too bad there's crap in the way of doing that though...
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