Author Topic: Which of these t3's would be ideal? (Read 3661 times)

hamradio · « **on:** February 18, 2009, 08:56:14 pm »

So, I have two t3's. Or what I believe to be two t3's.

The one on the left has an exhaust side of .48, compressor side of .60, and I believe 60 trim. The one on the right has an exhaust side of .48, compressor side of .42, and 50 trim.

If I'm shooting for 25 psi (which neither of these will be efficient at), would the larger one be better? Also, why does the smaller one have a different flange? And lastly, would water cooling be of any help on a diesel?

Thanks.

hamradio · « **Reply #1 on:** February 18, 2009, 09:41:57 pm »

Neither of these are stock diesel turbos. The right one is a volvo unit, I'm speculating that the left one is from a turbo ford...too large of a comp housing for a saab of the era, I think.

hamradio · « **Reply #2 on:** February 18, 2009, 10:12:09 pm »

Smokey Eddy · « **Reply #3 on:** February 18, 2009, 11:02:30 pm »

I vote left. Big turbo AND water cooled. You'd need to plum it though (plumb? plummer... yeah plum)
I was plum surprised.

jtanguay · « **Reply #4 on:** February 19, 2009, 01:05:32 am »

the water cooling adds another component to the setup... unless you want to install a turbo timer. (the coolant will boil and possibly 'burn' inside a super hot turbo)

the higher a/r turbo will take longer to spool, and the lower trim will give you more low end boost, which with a diesel is what you want. the higher trim turbo will probably allow you to produce lots of HP in the top end though... but then you need to do other things like modify the pump to allow for high rpm, and then you get into balancing everything...

just my $0.02

hamradio · « **Reply #5 on:** February 19, 2009, 08:27:19 am »

fwiw, I'm shooting for 140whp. Could the 50 trim (smaller one) actually flow that?

arb · « **Reply #6 on:** February 19, 2009, 09:45:53 am »

Quote from: "Smokey Eddy"

I vote left. Big turbo AND water cooled. You'd need to plum it though (plumb? plummer... yeah plum)
I was plum surprised.

Yeah, water cooled has my vote too. If you idle for a short time, you don't need a coolant timer or anything - it will cool off much quicker with the water cooling.

hamradio · « **Reply #7 on:** February 19, 2009, 12:49:33 pm »

I'm not really concerned about water vs oil cooled. I have no problem giving the car a little cool-off period...I already do that to begin with.

So, back to the original question, will the 50 or 60 trim be more desirable for 25 psi and a target of 140 whp? One thing that bugs me is the flanges are different...if I put the 60 on and it is too big, I'd need to make a flange adapter for the 50.

zukgod1 · « **Reply #8 on:** February 19, 2009, 12:52:04 pm »

I think you will be happier with the smaller turbo personally.

hamradio · « **Reply #9 on:** February 19, 2009, 08:21:20 pm »

At this point, I'm willing to give up instant boost and no lag (as experienced with the vnt) for more power.

I'll be using a gasser intake mani, and custom building a log manifold for the exhaust. I've never been thrilled with how tiny the stock manifold was.

Can I run the watercooled one without coolant? I'm thinking of trying out the larger one, if it is way too laggy, swap to the smaller one (just use the exhaust housing off of the larger one...both have same a/r's, but the large one uses a 'normal' t3 flange).

I'm also thinking of scouring the local junkyard (has a huge heavy equipment section) for a holset hx25.

foxracer1 · « **Reply #10 on:** February 19, 2009, 08:35:33 pm »

What engines, equipmtent, vehicles came with the Holset 25?

hamradio · « **Reply #11 on:** February 19, 2009, 08:48:24 pm »

Not sure! I was thinking maybe cummins 4bt or something, but I can't find anything showing that the hx25 was an application on them. There is a ridiculous amount of industrial equipment, diesel trucks, etc at the local JY. That's what is making me think I might be able to scrounge something up from there.

jtanguay · « **Reply #12 on:** February 19, 2009, 09:38:11 pm »

the T3 that came standard with vw 1.6TD's was also used on the 3.0TD 5 cyl mercedes diesel engine. that motor produced about 120hp at 10 psi (or so) boost. so i'd imagine that with some better airflow, and more fuel, 140hp should be easy.

AdAm84 · « **Reply #13 on:** February 19, 2009, 10:53:19 pm »

FYI 4BT's came with HY30W's A friend is planning 300HP with one of these on his Turbo Dodge.

hamradio · « **Reply #14 on:** February 20, 2009, 11:17:00 am »

I thought the different variations of 4b, 4bt, etc came with a myriad of different turbos.

Anyway, what I'm going to do is build a log manifold from mild steel weld els with a t3 flange. I'd start with the large one, tap into the heater core lines just for testing, and if it is painfully laggy (or leaks oil everywhere), swap to the 50 trim.

Author Topic: Which of these t3's would be ideal? (Read 3661 times)

arb

AdAm84