BHT3B turbo question?

[wsteffes]

Was wondering if anyone could tell me at what output pressure range this turbo is most efficient. Also a top end maximum safe pressure for this turbo.



The reason I'm asking is this winter I built a twin turbo setup on my 03. I've put enough miles on the new turbos now I'm starting to turn the fueling up.

This is what I have, hx35 hybrid on top with an external wastegate, this is feeding a bht3b with the 26 cm exhaust housing. Stock injectors, Edge EZ stacked with TST PMCR. Plus all the other stuff needed to support the power increase.

The highest I've had the the TST box so far is 5-5 and my 35 lb boost gage I had connected to the bht3b outlet was max'ed- I let up right now. It surprized me so much I never did see what the total boost was. I switched the line over to the 60lb gage I was using for total boost and ordered a 100 lb gage for the total boost. So the truck will sit till I get the gage.

Any help or ideas will be appreciated.

Bill

 

[Forrest Nearing]

I wouldn't worry if you saw 50+ out of it.

 

[J.R. Adkins]

I have pushed them 60+lbs.

 

[Jim Fulmer]

Tough turbo but I can only imagine what the air temp is like at high boost.



Jim

 

[J.R. Adkins]

Yea it takes lots of water to cool them down Jim.

 

[wsteffes]

Tough turbo but I can only imagine what the air temp is like at high boost.



Jim

Thats why I was asking if anyone knew what pressure to run for efficient boost on the bht3b. Just cause this turbo can make 50 to 60 lbs does not mean it's all good. That I understand.

If a turbo is 75% efficient at 30lbs with 70* air in that's over 325* outlet temp (before intercooler). Same turbo but 60% efficient at 50lbs air out is now over 525*.

One reason I did the twins was to keep the air temps down with enough boost to support the TST box. I'm just trying to set the p/r of the turbos to complements each other at 60 to 65lbs total boost.

I was also not aware that the Bht3b with a 26 cm housing could spool as quickly as it did to 35 +lbs with the little blurb of a run I did.

Takes for all replys,

Bill

 

[J.R. Adkins]

No need to guess. Why not take and measure discharge temps. There are tons of different compressor wheels for the HT3b. Looks like you need to slow down your 3b some.



J. R.

 

[wsteffes]

There are tons of different compressor wheels for the HT3b. Looks like you need to slow down your 3b some.



J. R.

Thats why I bought the turbo from Piers and explained what I was doing. Wouldn't you think they would tell me it's not going to work or sell me one that is set up right?

Slow it down that we can do. Run some exhaust right pass both turbos. Just like Mr Fulmer used to do way back when he was learning.

Thanks J. R. ,

Bill

 

[Jim Fulmer]

Run some exhaust right pass both turbos. Just like Mr Fulmer used to do way back when he was learning.



I've never run exhaust past both turbo's but I did run a wastegate from a spacer to the big turbo to drive it harder and a pop off to vent just a little air off to try and stay at 65 psi because that is were the old Twins started going south.



I don't know what psi the HT3B was running but the air was temp was up there, tests that others have done the 3B was making about 35 psi and that is fine with a Twin setup. The PDR 3B's are a great turbo so you didn't go wrong there, the price is good also and they have been worked on just like all the other turbo's that come out of there, meaning there not an out of the box turbo.



Other that just a few people it is the turbo to have in a twin setup, it's tough, not expensive and performs very well, you could get a B/B like mine but you will pay double over a 3B for it and it will not work as well on the bottom or a lower HP application as well as a 3B, I got it for one reason and one reason only... ... ... topend, lots of air at less than 40 psi but it is painful to mount with it's reverse rotation. Piers was working on a few other turbo's to perform in the higher HP areas but I don't know were there at with them.



Jim

 

[wsteffes]

Sorry Jim I really though it was you that had run the external wastegated exhaust through a flex line pass the bottom turbo right to the exhaust pipe. back 2002. My apologies!!

Thanks for the 3b input.

Bill

 

[Partyat33]

I am running a stock 3b with a 22cm housing along with the PDR 35. Spool is very fast and it dropped my EGT's from 1600 to 1300 running about 60 PSI. Seems to work very well. I have it divorced with the external wastegate. I think you are on the right track Bill.



Dennis

 

[Jim Fulmer]

Sorry Jim I really though it was you that had run the external wastegated exhaust through a flex line pass the bottom turbo right to the exhaust pipe. back 2002. My apologies!!

Thanks for the 3b input.

Bill

Bill actually your right, I did that at the very beginning (fall of 02') I ran the wastegated air from the spacer between the manifold and little turbo and vented it to the down pipe then found out that Pias Bell(original design) said if you wastegated it to the hot pipe you would be better off as it would drive the big charger harder and that was when I made that change.



Hope that clears things up for you buddy!



Jim

 

[Old Smoky]

The BHT3B has a P/R of 3. 9 (43psi) @ 61. 5% effecency.



Mike