opinons/ideas/advice on rb20swap?

[slidestyle69]

my roommate is prolly bout to buy an rb20 with an rb26 TT setup and valve covers. Its currently out of the car and has not been ran with it yet, what is recommended when doing this as far as Tune, exhaust work?

Kinda wanted to just do an rb25 turbo and be done with it but the TT setup seems cool and might be applicable for what the motor would be used for but we are not up to par with everything that would need to be done to prolong the life of the motor.

The setup has both turbo's and manifolds as well as the compressor side connecting pipe for both turbos and all the oil and coolant lines except for one coolant line so i guess we would have to find one of those or have a line made. The motor has a ku-engineering intake manifold Q45 TB and an N62 MAF, new timing belt and tensioner.

The seller is also throwing in a top mount T3 manifold so if we wanted to do a single we could but trying to keep cost down to the minimal in way

[Yellow4g63]

Use the single turbo, twin turbo downpipe = $$$$. Do a compression test on the motor before you give him money too.

[slidestyle69]

yea thats the only thing that is uncertain on how much of pain it would be to fit the setup, i mean we have a exhaust shop local that's made some pretty nice down pipes before on previous cars but w/o seeing the motor sitting in the car to get an idea of how close the fitment is to figure out if he can do it then that poses a problem. we could sell the TT setup and just a 25 turbo and manifold or run just one of the t28's but im gonna look into the specs on those turbos to see if it would be practical to run just one of the t28's

[Yellow4g63]

If the motor is stock then I would take the twins off. Stock RB20 injectors are only 270cc so unless you kept the boost down u would run lean. The Lag might be bad too for those twin turbo's tho I'm not sure I think someone on here did twins on a RB20 before.

[slidestyle69]

I don't know at what level they do max out but to say they need to be changed we have a set of 440's that comes with the swap. The main concern is where is the air/fuel mixture going to be at around WOT and if its leaned out or to rich whichever the case may be is an safc going to beable to even it back out because getting into dyno tuned and all that just isn't an option as the budget just doesn't have room for that and that's the determining factor on is this setup going to be applicable for us. I don't really think it will be a problem to get the air/fuel mixture in a safe zone because at the most we're shooting for a max of about 300hp but im no expert so thats why i ask questions, never hurts

the lag part, i was thinking full boost by 3000-4k max?

thoughts?

[Yellow4g63]

I'm not sure what the RB25 turbo will do on the 20. I went pass go when I changed my turbo. If it was 4k it would be nice but you should prob search the forum and pm that person to find out for sure.