Cummins 4BT & Diesel Conversions Forums banner

1 - 20 of 21 Posts

·
Registered
Joined
·
329 Posts
Discussion Starter · #1 ·
Just curious what max psi number those of you are seeing on your 4B with brand X turbo. I have an HX30 and may have a line on a HX35, just not sure if its worth it.

For reference I am seeing about 24 psi at max boost.

Thanks all
 

·
Registered
Joined
·
197 Posts
27 psi on my HY35W. Intercooler addition dropped it one psi but HP gains seemed to be substantial.
 

·
Registered
Joined
·
225 Posts
Running a H1C with 12cm turbine housing and compressor wheel/housing upgrade. 25lbs max boost, 6lbs at 65 mph with level highway. Starts boosting at about 1000 rpm.

Carl
 

·
Registered
Joined
·
278 Posts
Is that with or without a wastegate and how big is the compressor wheel? Did you start with a 6BT H1C and swap to the non-wastegated turbine housing?
 

·
Registered
Joined
·
225 Posts
H1C that came on the 4bta. According to Steve at Gillette Diesel Serv.(8oo-638-4679), My stock turbo had a 46mm compressor wheel. We upgraded to 52mm wheel and housing. I have only been running this for four days since clearing an intake restriction between turbo and manifold and am very happy. Listening to the guys here, the hy35 may be the perfect turbo for the 4bt but I did not have the firewall clearance for the downpipe. So I modified stock turbo and am very happy so far. As an added bonus it now produces a very nice turbo whistle. JOY!
Carl
 

·
Registered
Joined
·
228 Posts
boost

With the stock H1C I was maxing out my 35 psi gauge. With HX35/12cm (non wastegated) i was seeing about 30 psi. Both of those were non intercooled.

Now with my HY35 with the wastegate welded shut and a good sized intercooler I am pushing 33-35 psi.
 

·
Registered
Joined
·
335 Posts
stock hy35, no wastgate, 6cyl intercooler, 3in aluminum pipe, 3in intake, 57+ lbs of boost, one hell of a turbo bark when I let off, and know idea how long its gonna last when I run nitrous! :eek:
 

·
Registered
Joined
·
228 Posts
boost

I bet it's loud. Mine is at 35 lbs, I could imagine 57 would be crazy noisy!
 

·
Registered
Joined
·
84 Posts
stock turbo

stock hc1 fuel turned up with air to water cooler I can get 32 pounds loaded hard, but I have to watch the pyro.
 

·
Registered
Joined
·
38 Posts
an HY is so far out of its efficiency range at 57psi it's unreal... you're just feeding the engine overheated air and causing a unecessary exhaust restriction at the turbine.
 

·
Registered
Joined
·
75 Posts
92 K2500 4.10 4L80E ex 6.5 105hp 4bt. Did the 3200 GSK, one turn of the full load and afc mod 27psi at 2050rpm. Above 2300 pegs the 30lbs gauge. This 4BT now has more power than the 190hp 6.5.
 

·
Registered
Joined
·
220 Posts
92 K2500 4.10 4L80E ex 6.5 105hp 4bt. Did the 3200 GSK, one turn of the full load and afc mod 27psi at 2050rpm. Above 2300 pegs the 30lbs gauge. This 4BT now has more power than the 190hp 6.5.
Hey 57 napco,
How's your egts with the 93, and do you do any towing with it. Just wondering if the HE351 is up to the task. Is that a hybrid, or stock HE351? Also, do you run it up to 4K often?
Thanks,
Bob B.
 

·
Registered
Joined
·
50 Posts
Anyone sunning a WH1C on there motor..... i rebuilt one for my jeep and im putting it all back together as we speak..... just wondering on peoples experiences with them!!!!
 

·
Registered
Joined
·
754 Posts
hx35/40 hybrid, blocked wastegate, 40 psi
hy35 blocked waste gate 40 psi
hx35/40 hybrid over h2e 40 psi, no gating on low psi turbo, high psi set to 30 psi
 

·
Registered
Joined
·
754 Posts
stock hy35, no wastgate, 6cyl intercooler, 3in aluminum pipe, 3in intake, 57+ lbs of boost, one hell of a turbo bark when I let off, and know idea how long its gonna last when I run nitrous! :eek:
very supprised u can get that much boost out of that turbo. mine was at 40psi and it was starting to drop off in power. u have a ve or p pump?
 

·
Registered
Joined
·
238 Posts
stock HX35/12 (no gate) , Tenn diesel 75 HP stix,M&H M3 pin & dynamic timing,3 1/2 intake ,4" down pipe ,boost is currently @ 35-38 PSI,i had to dial it back, it was pushing 45+
 
1 - 20 of 21 Posts
Top