Turbo Rebuilding

[adam 32]

well the cars officially off the road and in pieces. i started work on it last night and got this far... (see pic)

thought i would keep you all posted in case any of this information is of help to other RB20 drivers...

[PSIKO]

what did you end up deciding to do to the turbo?

[adam 32]

drop the exhaust housing down from a 1.06 to a .63

[PSIKO]

who's doin it for ya?

[adam 32]

United are rebuilding the turbo

im hoping to make 270-300rwhp @ 1bar with full boost by 3500rpm *fingers crossed*

[PSIKO]

I thought u'd lose power from dropping the exhaust housing? or is that a drop from what it was?

is it costly?

[GTS-t VSPEC]

It might loose some top-end power, but should reduce the lag, which is more important.

See'ya:burnout:

[adam 32]

well my theory is i was makin 270rwhp before at 1bar but that turbos efficiency range would be 18-22psi. so while making decent power it wasnt working at the optimum rate

with a smaller exhaust housing the new turbos efficiency rating should be around 14-16psi (where i will run it) and so will work better and hopefully rpoduce similar power figures to what i had before

[GTS-t VSPEC]

It sounds good in theory, lets hope it works out that way.

See'ya:burnout:

[JH32]

Good luck Adam!

[adam 32]

UPDATE: Last night with the help of macka and shannon the turbo came off. macka took some pictures if he could post em thatd be good...

anyway it turns out the exhaust housing was in fact a .63 already but with a big mofo wheel. this setup was spooling at 4500rpm with power over 5000rpm...

i am going to try either a similar sized but different trim wheel, or get a new .63 housing which hasnt been machined as much and put a smaller wheel inside it. the turbo goes into United today so will let you know how it all goes and what option we choose

[GTS-t VSPEC]

Thanks for the update Adam, I wouldn't have thought that the trim would have made that much of a difference, but hopefully you can get a wheel to spool at 3500rpm, and produce peak power at less boost.

See'ya:burnout:

[macka]

Im glad u mentioned us that time Adam!

It looks like we will put a smaller ex wheel on with a shallower trim on a new .63 housing.

He has a GT25 compressor and GT40 Exhaust wheel

Yeah i agree you should make similar power at 1bar with a shallower trim wheel in it.

The comp wheel needs to go up

Ok ill resize some photos tonight and post just cause its you Ketz

[GTS-t VSPEC]

GT40 exhaust wheel! Interesting choice.

Good to see your helping little Adam, Macka.

Are Unitied choosing the size wheel etc, or is Adam doing it?

See'ya:burnout:

[macka]

Nah i lied its not a GT40 Wheel

I just checked and its inbetween a GT30 and a GT35 ex wheel.

Were going down to discuss whats best to put on hes not buying a diamond ring for his sl*t so hes not choosing it no

[GTS-t VSPEC]

Are United going to show you a compressor map, with and indication of when full spool will be reached, and max boost efficiency?

See'ya:burnout:

[adam 32]

me n mack have pretty much figured out what size wheel we want to put in the new .63 housing... but were gunah chat to steve and see if hes got any thoughts, hes the expert after all

mack i remeasured the comp wheel (more accurate) someone from engineering did it with these vernier extensions so it could go into the inlet pipe

its 58mm and the exhaust is roughly the same