turbo's t28's v's gt28rs'

[hollowpockets]

Looking for some info/advise please chaps.

I have my as new rebuilt t28's with the 360 thrust bearings and upgraded compressor wheels ready to go back on my car BUT have been reading some posts about the RS version, could someone please list some pro's/con's for doing the upgrade and tell me what my turbo's might be worth should i sell and go for the RS'

Thank you kindly

Graham

[Boosted LS1]

If you look at a garrett website I'll think you'll see the RS has a bit more flow.

[daddysumo]

hollowpockets said:

Looking for some info/advise please chaps.

I have my as new rebuilt t28's with the 360 thrust bearings and upgraded compressor wheels ready to go back on my car BUT have been reading some posts about the RS version, could someone please list some pro's/con's for doing the upgrade and tell me what my turbo's might be worth should i sell and go for the RS'

Thank you kindly

Graham

T28 good for 550 bhp
Gt28rs good for 600 plus bhp... but you need new bigger induction pipes,oil lines and metal water lines to the turbos.

[GTO600]

As daddysumo say's, l would stick to T28's unless you have everything else to support + 550 bhp

[hollowpockets]

GTO600 said:

As daddysumo say's, l would stick to T28's unless you have everything else to support + 550 bhp

well my car is in many pieces right now, so its a good time to carry out extra work if im going to do it. I will have the injectors, valve springs, heads, big end bearings, flywheel, clutch etc all done anyway so what else would need done other than what Steve mentioned about the air,oil and water lines?

[funkybmx1]

Getting them to actually fit. Bloody things there huge . Had to do some mods but every car is different as steves look ok to his car

[GTO600]

Basically you need a full Mountune spec engine to warrant the GT28's & uprated gearbox etc etc etc. Richards race car produced 600 bhp with modified T28's.

[hollowpockets]

GTO600 said:

Basically you need a full Mountune spec engine to warrant the GT28's & uprated gearbox etc etc etc. Richards race car produced 600 bhp with modified T28's.

The gearbox man has worked his magic on my box already, not mountune spec but the bearings will be upgraded and the head work done. Think I might just see what it all makes on the current turbo's though, can always do more later.

[andygtt]

if you want to aim for over 550bhp then go for them otherwise the T28's will do.

do you have forged pistons and reprofiled cams?

[hollowpockets]

andygtt said:

if you want to aim for over 550bhp then go for them otherwise the T28's will do.

do you have forged pistons and reprofiled cams?

Its an M400 so have forged pistons, not sure if the cams were different to other models but they are standard. 550ish was the aim anyway.

[andygtt]

I believe sundances M400 is similar spec to yours and made 550bhp on T28's.

Im not sure if cams or turbos stopped Sundance getting more or if he just stopped as that was enough lol

[Gadgeroonie]

there are many different verisons of T28 and GT28 turbo's

T28 is cira 500/550 bhp depnding on who's Dyno you test them on

GT28 is capable of over 700 hp

[wessexrfc]

andygtt said:

if you want to aim for over 550bhp then go for them otherwise the T28's will do.

do you have forged pistons and reprofiled cams?

Andy, just out of interest you mentioned the t28's that you sent me are modified, just wondering in what way?, just for my future reference Cheers.

[andygtt]

wessexrfc said:

Andy, just out of interest you mentioned the t28's that you sent me are modified, just wondering in what way?, just for my future reference Cheers.

Can't remember will have to dig out invoice, thy were specd by yellowshed and same as race car that was dynod at 600 bhp on R&T dyno
Incidentally the R&T chasis dyno apparently reads within 1% of the mountune engine dyno when tested back to back.

[daddysumo]

andygtt said:

wessexrfc said:

Andy, just out of interest you mentioned the t28's that you sent me are modified, just wondering in what way?, just for my future reference Cheers.

Can't remember will have to dig out invoice, thy were specd by yellowshed and same as race car that was dynod at 600 bhp on R&T dyno
Incidentally the R&T chasis dyno apparently reads within 1% of the mountune engine dyno when tested back to back.

Hmmmm...; well within 10% I would say...

[andygtt]

daddysumo said:

Hmmmm...; well within 10% I would say...

So for yours was it high or low?

[daddysumo]

andygtt said:

daddysumo said:

Hmmmm...; well within 10% I would say...

So for yours was it high or low?

R&T was lower than engine dyno...

[GTO600]

daddysumo said:

andygtt said:

daddysumo said:

Hmmmm...; well within 10% I would say...

So for yours was it high or low?

R&T was lower than engine dyno...

Thought mine was reading low !

[R0162]

Apart from the extra work fitting the GT28RS, you do not have to run above 550bhp, the compressor map shows the GT28RS sweet spot is 550bhp at 1 bar, they will run cool and economically. 550 is perfect for the GT28rs as far as i am aware.

Only reason i am going back to T28 route is because it is less work to fit them and i am only heading for 500 bhp and 420lb/ft torque.

[TuxMan]

i hope its reading high on thursday the 17th :-)