GT28 for CA18

poizen · Post by **poizen** » Sun Apr 17, 2011 10:02 pm

I think so yes

On my sr20 I get full boost at 4000rpm with a 0.63 housing

Just double check you may be able to put the exhaust housing of your old turbo on it should just swop over just check the wheel sizes

arno · Post by **arno** » Sun Apr 17, 2011 10:06 pm

Thanx guys

Daniel · Post by **Daniel** » Sun Apr 17, 2011 10:11 pm

I disagree, a standard non BB T28 from a S14 has a .64 turbine housing and spools only slightly later than a S13 T25

arno · Post by **arno** » Sun Apr 17, 2011 10:18 pm

now i am confused - it's not spooling correctly so i'm starting to think there is too litle exhaust gas to drive the new turbine... what else can cause it not to spool?

arno · Post by **arno** » Sun Apr 17, 2011 10:28 pm

S14 produces more exhaust gas because it is a 2l....

arno · Post by **arno** » Sun Apr 17, 2011 10:39 pm

Daniel wrote:I disagree, a standard non BB T28 from a S14 has a .64 turbine housing and spools only slightly later than a S13 T25

now i am confused - it's not spooling correctly so i'm starting to think there is too litle exhaust gas to drive the new turbine... what else can cause it not to spool?

Daniel · Post by **Daniel** » Sun Apr 17, 2011 10:40 pm

I should probably have been more specific...a S14 T28 on a CA18DET spools only a couple hundred rpm later than the standard T25.

arno · Post by **arno** » Sun Apr 17, 2011 10:45 pm

Daniel wrote:I should probably have been more specific...a S14 T28 on a CA18DET spools only a couple hundred rpm later than the standard T25.

So it should work... Let me give the guy who has to dyno it for me a call tommorrow and see what he has to say.

Daniel · Post by **Daniel** » Sun Apr 17, 2011 10:48 pm

Here are your pics

I've never compared my T28 to my T25 like this, but if you can wait till the long weekend I can compare with my spares from the two.

arno · Post by **arno** » Sun Apr 17, 2011 10:51 pm

Daniel wrote:Here are your pics

I've never compared my T28 to my T25 like this, but if you can wait till the long weekend I can compare with my spares from the two.

thanx so much.

aep886 · Post by **aep886** » Mon Apr 18, 2011 12:05 am

S13 T25 vs S15 GT28R

BigKriss · Post by **BigKriss** » Mon Apr 18, 2011 6:10 am

Arno, your new turbo should work well here, albeit a bit later in the rev range.

I suspect the pre tension on your waste gate actuator is not set correctly. Do you have pre tension on the waste gate flapper valve ?

If you do then the turbine side is rather large . Having said this , once the turbo starts feeding on itself it should really wack into boost up to the waste gate setting.

I would not blame the turbo at this stage, look for the problem elsewhere..

I still go with wategate pre tension..

rat · Post by **rat** » Mon Apr 18, 2011 6:54 am

I used to run a TB2804 which is the turbo from a GTiR T28 with 0.86 exhaust.

Mods were dicktator exhaust and filter full boost was at 4000rpm nothing before but held all the way to the redline

arno · Post by **arno** » Mon Apr 18, 2011 8:27 am

BigKriss wrote:Arno, your new turbo should work well here, albeit a bit later in the rev range.

I suspect the pre tension on your waste gate actuator is not set correctly. Do you have pre tension on the waste gate flapper valve ?

If you do then the turbine side is rather large . Having said this , once the turbo starts feeding on itself it should really wack into boost up to the waste gate setting.

I would not blame the turbo at this stage, look for the problem elsewhere..

I still go with wategate pre tension..

Hi BigKriss, I left the actuator as it was from the factory, I have to stretch it about 4mm before it goes over the waste valve shaft. should I put more tention and try again.

arno · Post by **arno** » Mon Apr 18, 2011 8:30 am

rat wrote:I used to run a TB2804 which is the turbo from a GTiR T28 with 0.86 exhaust.

Mods were dicktator exhaust and filter full boost was at 4000rpm nothing before but held all the way to the redline

That is even bigger than mine, was it on a CA18?