Performance and Accessories 2nd gen only Talk about Dodge/Cummins aftermarket products for second generation trucks here. Can include high-performance mods, or general accessories.

Comparison Summary - Turbo Numbers

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Old 05-02-2005 | 05:42 PM
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Comparison Summary - Turbo Numbers

I was summarizing info from another thread and figured I would share the findings with anyone interested!

Based on info provided in a previous thread, PM's and other non related threads, here are the averages of turbo boost at 60 mph & 70 mph...and EGT's at 30 Psi boost....for 12 different turbos.
Previous Thread - https://www.dieseltruckresource.com/...threadid=66483

These numbers may provide good relative positioning of turbos..for anyone thinking about upgrading.

TURBO.........................60 MPH...................70 MPH..........................EGT's @ 30 PSI

HY-35.......................... 5 psi....................... 10 psi ........................ 1200*
HX-35.......................... 5 psi ....................... 9 psi ......................... 1200*
35/40 Hybrids ............... 4 psi ....................... 9 psi ......................... 1100*
HTT HTGB .................... 3 psi ....................... 7 psi ......................... 1100*
KSB1-2 ........................ 6 psi ....................... 8 psi ......................... 1075*
Piers HX-40 .................. 5 psi ....................... 7 psi ......................... 1050*
HTT HTB2, 12cm2...........4 psi ........................ 6 psi ......................... 1000*
KSB-1 ......................... 3 psi ........................ 6 psi ......................... 1000*
B1-2 ........................... 3 psi ........................ 5 psi ......................... 1000*
Holsett HX-40 ............... 0 psi ........................ 0 psi ......................... 1000*
HTT SP 66 .................... 0 psi ........................ 3 psi .......................... 950*
Full B-1 ........................ 0 psi ........................ 3 psi .......................... 900 *

Nothing super scientific here. Took altitude into acct but not outside air temperature or truck body styles or empty weights.

Turbos were ranked by air moved at 30 psi (EGT's).

No big suprises, but it answered some of the questions I had, and may be useful to others.

RJ
Old 05-02-2005 | 08:14 PM
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Good Job RJ,

Two questions:

(if you or anyone else knows)

How large of injectors are considered minimum to use on each turbo,

and how much affect does temperature and or humidity have on each turbo?


Thanks,


George
Old 05-03-2005 | 08:58 AM
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George

I would say Mach 1.0's, 1.5's or your Mach 2's would work well up to and including the B1-2.
Mach 4's (Mach 3's are being discontinued, I believe) would need at least a 35/40 Hybrid, IMO, and work up to a Full B-1.

Temperature affects the density of the air being compressed...thus the performance, with hotter air being thinner and producing less HP. Humidity is tied, somewhat to temperature, but I'm not sure how two different humidities (at the same temperature) would affect turbo performance?
RJ
Old 05-03-2005 | 09:43 AM
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Why are some turbos boosting 0 psi at 60 and 70 mph?
Old 05-03-2005 | 10:04 AM
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They have bigger exhaust housings and don't build boost at those speeds, at least that's the most likely case.

Chris
Old 05-03-2005 | 10:10 AM
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Yup! Bigger turbine housings and/or bigger turbine wheels...not enough drive pressure to build boost yet.

RJ
Old 05-03-2005 | 10:10 AM
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This may show my "turbo ignorance" but wouldnt the EGT's be the other way around.
No boost = higher EGT's?

Those numbers would say that 0 boost has lower EGT's?


Rich
Old 05-03-2005 | 10:40 AM
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Boost isn't the same as volume. Think of your water hose, if you turn the water all the up it will squirt 15ft. if you put a nozzle on it you can make it squart 40ft. but the volume of water hasn't changed.

A small turbo has to put out more pressure (boost) to move the same amount (volume) of air as a larger turbo does with less pressure (boost).
Old 05-03-2005 | 10:42 AM
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This too is caused by the bigger turbine housings...bigger area, same flow=less resistance and less heat.

To a point you're right Rich, but just because it's not making boost, doesn't mean it's not moving enough air to feed the engine and keep EGT's where they need to be at cruise.

Make sense??
Chris
Old 05-03-2005 | 10:57 AM
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Got it. Thanks guys.

Rich
Old 05-03-2005 | 12:24 PM
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Let me get this straight. At cruise(2000 rpm) w/stock injectors and HX35, 6 PSI boost, EGT apprx 1000.
Same engine, and injectors w/hx40 turbo, and 0 psi boost at 2000 rpm, I think EGT has to be higher, and more smoke. There just is no way the same amount of air is going in the cylinders w/out boost.
Old 05-03-2005 | 12:58 PM
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Originally posted by gamiller31
Let me get this straight. At cruise(2000 rpm) w/stock injectors and HX35, 6 PSI boost, EGT apprx 1000.
Same engine, and injectors w/hx40 turbo, and 0 psi boost at 2000 rpm, I think EGT has to be higher, and more smoke. There just is no way the same amount of air is going in the cylinders w/out boost.
I agree. I don't know if it's the same amount of air (with the HX-40) or not. Maybe less...but still some air; probable more than enough to maintain 60 or 70 mph, empty on level ground! Thus, no more smoke and not necessarily higher EGT.

The EGT's listed have NOTHING to do with the boost levels at 60 & 70 mph! The EGT's listed are same Turbo at 30 psi sustained boost....it's a different category to help compare air flow of different turbos without max hp getting in the way.

RJ
Old 05-03-2005 | 01:22 PM
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OK, I was thinking my logic was not right about the amount of air in the cylinder. I would not want to be behind my truck doing 2000 rpm in high gear w/0 psi boost. Would have to be smokin pretty good.
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