What turbo are you using????
 

I'm looking to buy a new turbo for my d24t project. So looking at compressor maps and my calculations looks to me the best option is a T3 48AR hot side with 60 trim compressor. It is a straight T3. Planning on going ball bearing to help spool.. I'm shooting for 150-160hp at 25psi with large intercooler.

I wouldn't waste the money on ball bearing, thats not going to make much difference and is a huge price increase. The .48 A/R T3 side will spool nicely, though I would go with a T4 compressor with a 50-52mm inducer. You could go straight T-3 but the larger compressor will move more air and do it at a lower temp. You wont need 25psi to clean up the fuel for 150ish hp. 20 will probably do it. I'm running a .63 A/R hot side on my turbo, which makes it slightly soggy down at lower rpms but keeps the drive pressure down and I think is easier on the engine if your running it hard like I do. I can still make full boost by around 2500rpm though. Remember these engines don't like to make a bunch of boost down low with heavy fueling, they tend to bend rods, though at 150hp that shouldn't be an issue.

Jason

Turbonetics turbo review.
 

Here is my opinion on the turbo that I installed on my 244. I installed a Turbonetics T3 super 60 compressor with 48 turbine housing and F49 wheel. I did several calculations and looking at compressor charts the super 60 was the best match for 180 hp. I picked the 48 AR because I still wanted it too spool fairly soon and wanted it to flow better then the stock 36 ar. I ran the turbo on stock fuel settings and .95 timing. Turbo spools up right off 1000 rpm and had 7 psi @ 2000. I turned up the fuel screw 1/2 turn and have injection timing at .85, It will have 5psi at 1600 and 10psi at 2000. I have no wastegate so I'm not going crazy on the fuel setting. I did a pull in 4th gear on a long hill and built 25psi at 2700 (850 EGT) and climbing before the rear cap blew off my intake. I'm very happy with the turbo. Oh ya, almost forgot.. Those numbers are with the stock 240 diesel exhaust that has 2" piping and two mufflers, very restrictive. It should spool very well with little more fuel and good exhaust.

Wow, that spools much lower than mine! Harder to tell with mine i suppose as its an auto and the revs rise as the turbo spools more, but still i'll only get 5psi around 2000.

I really don't understand the different components to a turbo either so all of you talk of hotside and t4 compressors etc have gone straight over my head!

I have a holset hx35 with a 12# turbine housing, 60mm turbine wheel, and a 54mm compressor wheel.
15psi comes around 2900rpm, and after that it really kicks in. just a little over 3000rpm i have 30psi and the engine revs over 5500rpm (6000rpm according to the original tachometer).
In the dyno it made 267hp, but i haven't checked the egt or the drive pressure yet.

how about holset vs. vnt (or vgt) or whatever you want to call them?

i'm asking for my project car that will be a weekend fun car, not a daily driver.

I think the next turbo I would try is a T3/T4 hybrid with .63 hot side with the F1-57 wheel, with a T40E compressor housing 46 trim in a ball bearing package. I think the drive pressure would be low and would still boost fairly quick.

As i know a vgt spool a way sooner at lower rpm but need an actuator to move the specific mechanism.
electrical mechanical vacuum operated whatever it is it must be piloted.

you could use the throttle thing where the cable is attached, there is an empty cable emplacement.

i've thought to a vgt yet that's seems a good idea.

I've been reading up about VGT/VNT turbos, and apart from the vanes sticking they seem a very good idea - obviously why in a modern TDI you hear them spool up as soon as they pull away.

I always feel my D24T is starved of air a bit at low revs, and would be a bit more efficient with a few psi at 1500-ish revs.

Apart from the vacuum device to switch the turbo from "small to large", would it be easy to fit one to a D24T? Maybe from a VW TDi (PD 130)? Or would the flanges on the turbo all need modification?

Even if you can adapt them quite easily ,they are very small and the flanges are quite simple to do, you will not have an adapted turbo from a 1.9 l engine.

they spool very soon but the turbine and compressor sides are tiny and built to be very responsive only.
they are "out of breath" quite soon wich is not the case of a d24.

1.9 run on torque that's why they have a 6 speed gearbox :)

the d24 is a 2.4 liters that's mean 500 cc bigger and as a 6 cyl (i mean strucuraly) has normally not a big torque on the low rpm.

vgt is a very good idea but a bigger turbo is needed imo like one from a v6 tdi for ex