Fiecos Dan

As i'm wanting to change my XR2t's turbo.

But not sure whats the T25 i have fitted is good for.


- Std Xr2 TT turbo

T25,
t25 comp housing off of a saab, .36 comp wheel.
exhaust housing .49 off of a rover 820 ventess,
t25 centre housing, with 270' bearing.




- My T25 built by universal turbo's, as above but -

T25,
.45 comp wheel,
.64 exhaust housing from a nissan 200sx s13
T25 centre housing, with staggered piston ring, a mellott 360' bearing

Not sure of its power capabiltitys of the compressor side, nor the flow of the exhaust side,

its made



4/03 on BD's RR

140 bhp @ wheels @ 12psi
165bhp @ wheels, at 17psi,
on a 7.0:1cr 1.8 cvh, flowed head and cvh35 cam



1/04 on BD's RR

143 bhp/wheels @ 10psi
154 bhp/wheels @ 13psi,
on a 9.3:1cr 1.6 cvh, flowed head and cvh 35 cam



3/04 on PTS RR

147 bhp/wheels, 196 lbft @ 10psi
165 bhp/wheels, 229 lbft @ 13psi
on 9.6:1cr 1.6 chv, flowed head and cvh 35 cam.


6/06 on Surrey RR, Dyno dynamics.

148 bhp/wheels, 170 lbft @ 12psi
155 bhp/wheels, 184 lbft @ 16psi
159 bhp/wheels, 194 lbft @ 18psi
on 7.9:1cr 1.6 cvh, Stg 3 head and cvh 36 cam


As you can see i've tried different engine spec's, and the turbo will produce 23 psi from 3600 rpm and hold it to 6500 rpm

But its so Laggy, i mean 15 psi @ 3500 rpm, 10psi @ 3200rpm, on the same spec as the rr figure for 6/06
I've driven RST's on T3's that are 500 - 700 rpm less laggy.

i believe the turbo to be fine for over 170bhp/wheel (210bhp/fly), but at the moment the Ex mani isholding it back, as its a poor design.



i either going to

modifie my T25 to fit a T3 RST ex mani

or

fit a T28 nissan pulser turbo to a T3 mani

or

try a T3, but dont know whats best spec for 220bhp?

Fiecos Dan

Nissan/Garrett standard turbo information

S13 SR20DET: T-25, 60 trim 56mm BCI-1 compressor, 53.8mm 62 trim
T-25 turbine, .64 A/R turbine housing. Journal bearings.

S14 SR20DET: T-28, 60 trim 60 mm BCI-1 compressor in T-04B housing,
62 trim 53.8mm T-25 turbine. .64 A/R turbine housing. Ball bearing center section.

S15 SR20DET: T-28, 60 trim 60 mm BCI-1 compressor in T-04B housing with Inco turbine wheel, cast divider wall between turbine discharge and wastegate. Ball bearing center section.

Pulsar GTi-R: T-28, 60 trim 60 mm BCI-1 compressor in standard T-3 housing. 79 trim 53.8mm Inco T-250 turbine wheel .86 A/R turbine housing. Journal bearings.


and here's a compressor map for the pulser turbo.






need to find a comp map of my TT turbo, std T3 and a stg2/3 T3

Stavros

Cant totally help, but i know a S14a turbo is good for about 280bhp and is a lot less laggy than a Pulsar turbo, tho that can do way more power.

Also, the S13 turbo info you got isnt relevant to the S13 turbos you will get in the UK as thats the T25R or whatever they calll it from the SR20 engine ones, not the slightly smaller T25 from the CA18 engine one you get in the UK and can pick up for 50quid.

S15 turbos are meant to be great mind.

Fiecos Dan

Cheers Steve.

do you know where i could find Compressor maps?

Fiecos Dan

A std RST t3 comp map