Which turbo for my DB4 build guys ???

[buddy]

The turbo I had on my 6.2 was a hx 55 ,thought it was a 52. I'm going to try a real pro 52 on the 6.5. It is off of a friends p pumped 24 valve and made well over 60 psi. I have a genuine hx 40 with a t3 flange,but it has a broken shaft.

Can you tell us which wheels that HX40 has? I have heard of broken shafts on them before, and I wonder if its with the faster spooling wheels, the 81mm compressor and 70mm turbine.

Was there much lag with the HX55?

Thanks for any info.

 

[6.2 turbo]

I can check, maybe tomorrow. I think the exhaust housing is a 16 cm waste gated. The hx 55 lagged to maybe 2300-2500, it had a 19 cm exhaust housing,and the hx 52 has a 16 cm . The exhaust turbine is a little smaller on the hx 52,but the compressor inducer is way bigger,I think its right on 2.5 inches. I also have Schwitzer s 300,and a hybrid 35/40 but it has bad seal groove. The schwitzer has high flow wheels,a 6 blade compressor and 10 blade exhaust. I think you can get some hx40's like that ,but very rare. The super 40 might ,not sure. Most Holsets have 12 blade turbines.

 

[turbonator]

So would a gm 8 so thats no apples to oranges comparison either.

Your stock gm 3 is the most restrictive turbo gm made as far as high rpm is concerned.

Not bashing you just sayin.

if you really want to speak about apples and oranges then here is one for you... why even compare "high performance turbos" on these when 90percent of the problem is the unbalanced cobbled together turbo manifolds, cross-over, intake,etc,etc.... remember the best h.p. numbers on the 6.5l (215 hp OEM) came from the van/hummer centre mounted turbo.... and that is a turbo with a 2 1/2 outlet/downpipe..... not bashin, just sayin...

 

[vdb11]

if you really want to speak about apples and oranges then here is one for you... why even compare "high performance turbos" on these when 90percent of the problem is the unbalanced cobbled together turbo manifolds, cross-over, intake,etc,etc.... remember the best h.p. numbers on the 6.5l (215 hp OEM) came from the van/hummer centre mounted turbo.... and that is a turbo with a 2 1/2 outlet/downpipe..... not bashin, just sayin...

That is an excellent point. Although I will probably not attempt a centre mount on my VGT, even though that would be ideal, I will be looking into a better exhaust system (headers, different crossover pattern). I think you are right on that the factory exhaust manifold set up is just as much of a performance killer as the turbos themselves.

Also, as for some numbers to look at, my VGT seems to run about 1.5:1 to 2:1 drive/boost pressure ratio, depending on how I have the VGT adjusted. At 10 psi, I have seen anywhere from 15-20 psi on the hot side. My copper line is plumbed into the crossover on the driver's side to a simple tire pressure gauge I got from Kory.

 

[Acesneights1]

I thought about going centermount because on MY CUCV it might solve my exhaust routing problem

 

[buddy]

The HX40 actually has a larger turbine that the HE351ve, well it has the 60mm exducer and 70mm inducer, so its that same as some HX40s. So if looking for best flow through then the T4 HX40 w/ 76mm inducer turbine or ATT would give best flow. The T3 HX40 is like a step inbetween the GM8 and a T4 HX40 or ATT. The ATT has a better compressor wheel though, known quality control and bolt in ease.

 

[Woody35]

these turbos look like a good fit but the quality still scares me to run one is the cheap price. ive tried to researched these china hx40s made by emusa and nothing bad really has come up when searching forums that pop on google. one guy said though he did dissasemble an emusa turbo but not a hx40 and he said some part that i cannot remember was rotated 45 degrees from were it should of be but the turbo worked fine.

another guy who was a tuner was local to emusa headquarters and knew about a lot of guys testing these turbos and he said that a lot of them had no problems but some did. he didnt post in detail though about the guys having problems. these emusa turbos are balanced but no one knows if its done correctly. The ATT has foreign parts in it but they run just fine with not really any problems so far so china has upped its quality but i guess at the end of the day its the sellers responsabilty to make sure a turbo is quality.