Anyone fitted a T3 or T4 turbo?

[simonC]

Might sound a daft question to some, but bear with me.
The reason this sort of makes sence to me is that IHI RHC6 aka Borg Warner GM turbos are almost non existant in england.
Yet for reasonable money a hybrid T3 / T4 turbo can be had.

Basically the reason this makes sence is because my vehicle is a daily drive and off road play toy at weekends.

So low down grunt is more important than the ability to haul 5 tons up the side of mount everest on tarmac.

The idea of the hybrid turbo is fast spool up and boost from idle to flat out.

Ideally with somewhere in the reigeon of 1 or 2 PSI at idle and 10 PSI under mid to full load.

Have checked availability and that seems no problem and at least in small petrol engines with the ability for such engines to produce up to about and in some cases slightly above 300 BHP at the wheels.

Hopefully as the fuel pump is mechanical it could be adjusted to suit and give some serious low down grunt, this combined with a large intercooler should give little impact toward the thermal loading on the engine, bearing in mind that I am not aiming for top end power but low down grunt.

I know this engine dose not always get intercooled and some shout about it restricting the inlet side, but possitive pressure overcomes this minor problem when the waste gate is worked from boost pressure after the intercooler.

Was wondering if anyone had any thoughts on the subject?

Going to see if I can find any data / maps on flow rates and see how they compare to a stock GM turbo

[turbos10]

I have never done it, but a T3 turbine is too small in my opinion. I suppose you could order a .84 turbine and combine that with the T4 compressor, but I would just use T4 components. Boost pressure is largely dependent on load, and the T4 should do just fine off of idle if you can find one with a ~.80 A/R range turbine. They make some turbines up in the 1.2 A/R which could make it a little more lazy to spool, but not by much. Remember you are pushing 6.5 liters here. The T3 is designed for around 2.5 liters on primarily gasoline applications. Rough rule of thumb for sizing is double that number for a diesel putting you around 5 liters for the little T3.

Just some food for thought...

[simonC]

Have been looking around the internet and trying to find compressor maps to come up with a suitable T4 turbo, however finding one with a sufficient CFM and a pressure ratio of 2 seems to be difficult to find.
Guess it's because people who want to find the info generally are in search of high boost levels.
Anyone got any links where I could find the info?

[simonC]

Hi,
Can someone tell me when looking at compressor maps.
I presume the cfm stated is the dynamic CFM?
So if a 6.5 engine doing 3400 rpm with a turbo with a pressure ratio of 2.
The CFM would be 200 cu in per rev times 3400 times 2 = 1360000 cu in.
Or 787 CFM.

Either that or it's 393 CFM at 14 pounds boost.

Dose this sound right as I am new to compressor maps?

Regards

Simon