turbo spec ?

[purplemonster]

hello..

i have been offered the T04e .50 front AR with a s60-1 wheel.comes with a .48 or .63 stage 3 exhaust wheel..

.OR

A t-66 with a .70 front ar with a .68 "p" trim t3 flange for the exhaust

OR

A T-61 in the same basic set up

what do u think ? im looking for a turbo for 450bhp.

ROBERT

 

[zia]

the first one has small a/r than the standard t28 which will spool up quicker but could cause high rpm power loss

the second one you,ll need custom manifold and dumpipe made up which could be expensive.

zia

 

[purplemonster]

i dont mind making manifolds and downpipes fit ,but i have very little knowledge of turbo specs at all ?

so is the 2nd turbo any good for an R and how much bhp is it good for ?
any idea

CHEERS
Robert

 

[Sirnixalot]

Definatelyover kill for 450bhp


Just because the A/R is smaller doesnt mean it will spool quicker. The housing sizes are WAY different when comparing a T-28 to a T04E. That T04E will make boost around 5000rpm and will support 500-600bhp with each respective A/R turbine.

the T66 supports 600+hp but doesnt go anywehre near positive pressure till after 6000rpm.....drag race turbo only.


You want 450bhp with boost before 5000rpm get this

Garrett GT30R

Compressor
-Wheel: 76.2mm w/ 56 trim
-Housing: .60 ar

Turbine
-Wheel: 60mm w/ 84 trim
-Housing: .82 ar, 1.06 ar


US$1350 at www.atpturbo.com

 

[purplemonster]

great some one that knows about turbos LOL

so this GT30R ? when will the turbo start to come in ,and if i run 2 or 3 stage boosting can i still run round at 300bhp like i am at the moment with my 1.2 bar of boost ?
and any idea of when max boost will be made ?


cheers

 

[Sirnixalot]

It will start to go positive at around 4700-4900rpm and will make full boost 300-500rpm after that. You will ahve to use an external wastegate. You can have the wastegate spring set to open at say 0.7bar, then if you turn on the boost controller you can use the low setting to bump it to 1 bar and then the high to bump it to 1.4bar. This is what i plan to do.

I have the HKS equivalent to the Garrett GT30 and it makes 1.6bar @ 4700rpm if i remember...it might be sooner but im not sure. It can support 440bhp. The Garrett GT30R can support 500bhp. These turbos are most efficient in the 1bar to 1.6bar area.

 

[zia]

sorry didn,t mean give false or inaccurate info just going by what i know which that the larger ex a/r the better or less the exhaust back pressure and high rpm power available. T4 with ex housing a/r 43 or 63 is not going to give you the flow you require. sirnix is the expert i bough to his knowledge :lol:

zia

 

[Sirnixalot]

This is Zia the A/R is a ratio of the turbine blades surface area to the compressor housing volum i THINK..i need to getmy books out.

So with the T4 being a large turbo the turbine housing and turbine blades are alot larger than the T-28. Now the surface area to flow ratio of the T-28 has to be very very large to compare to a small ratio T04. To put it into perspective that To4 would go very nicely for a streetable 5.0L V8.

 

[zia]

a/r is the ratio between center of outlet housing and center turbine housing
the quicker you can get gases out the less the back pressure acting on the turbine. if the volume of gases stay in housing for to long you will get turbine stall. i.e small turbine a/r visaversa. fundamentally this is what controls lag(i think). sir nix in no way i.m i doubting your knowledge 8)

zia

 

[Sirnixalot]

and i am not doubting you knowledge Zia 8) i need to get my books form home and have a re-read but i can garuntee a T4 with a 0.48 A/R turbin housing will NOT spool quicker than the standard T-28.

 

[purplemonster]

well i want may not be avalaible then ?

i want boost before 4500rpm

i will be having a turbo built .as it looks cheaper ? i dont want expensive branded turbos and pay for the name

so what if i go T3 exhaust housing and trims etc to bring the turbo as per normal at 3000rpm ish,then a larger T4 or larger compressor housing and wheels ?
in theory it should come in early and make highish power figures?

?
ROBERT

 

[Anonymous]

ok, how bout this turbo ?

T28 with 80A/R exhaust housing, 63 housing, 67T turbine to 59 Lb/Min. Full load pressure starting from 3000 - 3500 RPM. Oil and water-cooled

 

[Sirnixalot]

Can you clean up those specs a little please?

I need

Compressor Trim
Compressor A/R

Turbine Trim
Turbine A/R

to help you properly

 

[Fast Guy]

This is off the Turbo Dynamics site. If they can do it for the Cosworth then surely they (and everyone else ) could do it for the Gtir?

‘The Ultimate Turbo for Cosworths’
Manufactured to fit 2WD & 4WD Sierra Cosworths, RS500 & Escort Cosworths.
Hybrid turbocharger – Part No. MD240
All units are hand built and blueprinted to exacting tolerance for each customers needs.

Specification

1. 48 trim, 93865S specification TO4E 76mm high flow compressor wheel with 53mm inducer diameter.

2. 0.70 A/R compressor housing with 3 or 4-inch diameter inlet & 2.5 inch compressor discharge for maximum air
flow capability.

3. Left hand threat shaft with GT28 series 76 trim ‘low inertia’ Inconel turbine wheel, fitted with a racing ‘Staggered
Gap’ total seal ring to stop oil seepage caused by large bore or low backpressure exhaust systems.

4. Modified bearing housing fitted with angular contact twin roller bearing cartridge for maximum thrust load
capability and fastest ‘spool time’.

5. Specially modified turbine housing, 0.61 A/R with ported & polished inlet throat.

6. Optional uprated actuators (any pressure) fitted to strengthened welded on aluminium actuator bracket.

7. Compact GT28 bearing housing assembly for optimum water and oil cooling efficiency.

Note. Requires modified oil feed pipe and oil drainpipe. Oil feed adaptor fitting and oil return flange
supplied with turbo.

What you can expect for your money

1. Boost pressure starts @ 1,800 - 2,000 R.P.M.

2. Full boost (limited) 2.1 BAR @ 2,800 R.P.M.

3. No drop in power @ 6,700 R.P.M.

4. Increase in torque and horsepower over the TB34 unit through the entire rev range.

5. A conservative 450 BHP potential.

Re-mapping is a must with this unit, as the standard ignition map will not keep up with the fast spool up time of this
unit. Performance will vary depending on engine specification such as camshafts etc.

 

[coxie]

f*ck me that is almost identical to the spec and pic of the welded bracket etc that i posted of my turbo from TD in the wastegates thread...it couldn.t be could it :shock: :?: