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Tractor Transporting

Re: 1989 Cummins Modification

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PretendFarmer

12-23-2013 19:20:00
70.188.162.167



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T in NE said: (quoted from post at 20:03:26 12/22/13) There was no waste gate on the Cummins in a Dodge application til the 24-valve.


Not true.

Every turbo powered Cummins has a waste gate. They are set at different levels depending on the rig. How do you explain a stock 97 auto cummins being set at 19psi? Where did you hear that they had no waste gate. Doesn't even make sense. Without a waste gate, I could either blow the turbo or not get any boost at all.
This post was edited by PretendFarmer at 19:22:27 12/23/13.

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T in NE

01-04-2014 08:08:59
75.234.171.203



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 Re: 1989 Cummins Modification in reply to PretendFarmer, 12-23-2013 19:20:00  
I have a 90. Please, come show me where to find the wastegate. We'll have a look at the boss' 96 as well. All the wastegate does is let exhaust by-pass the turbine so you don't over-speed the turbo. The 12-valves were governed to 2500 RPM, unlike the 24-valve at 3200, so it wasn't as much of a concern.



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PretendFarmer

01-05-2014 05:11:11
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 Re: 1989 Cummins Modification in reply to T in NE, 01-04-2014 08:08:59  

T in NE said: (quoted from post at 17:08:59 01/04/14) I have a 90. Please, come show me where to find the wastegate. We'll have a look at the boss' 96 as well. All the wastegate does is let exhaust by-pass the turbine so you don't over-speed the turbo. The 12-valves were governed to 2500 RPM, unlike the 24-valve at 3200, so it wasn't as much of a concern.


I'll be happy to take a picture and post the one from my 97 12 valve.

The best upgrade is an upgraded waste gate. But most people like me put in a restrictive adjustable boost elbow to get our boost numbers higher.

The stock waste gate on 2nd gen 12 valves is set to 19psi on automatic rigs and 21 psi on stick shift rigs.

It is very easy to overspeed a turbo on 12 valves if you block off the waste gate completely.
This post was edited by PretendFarmer at 05:13:33 01/05/14 2 times.

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T in NE

03-09-2014 11:56:12
75.234.148.192



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 Re: 1989 Cummins Modification in reply to PretendFarmer, 01-05-2014 05:11:11  
I had the turbo off my 90 last summer. NO WASTEGATE! Stock H1C Garrett.

If you're necking down your intercooler tubes to show more manifold pressure you're going backwards.



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