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Tractor Transporting

Re: 1989 Cummins Modification

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PretendFarmer

12-03-2013 11:59:29
192.249.47.207



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Yea gages are a must especially EGT. You may find your EGT's tough to keep under control when using that power without an intercooler. You can get a boost elbow for the waste gate but dont push the stock turbo over 35psi. That boost is a must for increased fueling.




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showcrop

12-23-2013 05:47:38
75.67.231.80



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 Re: 1989 Cummins Modification in reply to PretendFarmer, 12-03-2013 11:59:29  
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This could be something that is now updated but I thought that Exhaust getting too hot as in a heavy truck application was in a low RPM setting under a heavy load, where the air flow was inadequate to keep temps down as opposed to lack of cooling of the intake air. It has been my understanding that the reason for the use of intercoolers is to stuff more air into the motor by increasing its density by cooling, as opposed to it being an additional cooling attachment.

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PretendFarmer

12-23-2013 19:19:41
70.188.162.167



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 Re: 1989 Cummins Modification in reply to showcrop, 12-23-2013 05:47:38  
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I would say your spot on.

The intercooler...well.... cools the air. The end result is the engine running at cooler temps.
Also, turning up fueling without increasing boost will give high EGT's. The biggest function of the turbo is to get more air in there helping to keep it cool.



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T in NE

12-22-2013 11:03:26
75.239.161.48



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 Re: 1989 Cummins Modification in reply to PretendFarmer, 12-03-2013 11:59:29  
There was no waste gate on the Cummins in a Dodge application til the 24-valve.



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PretendFarmer

12-23-2013 19:20:00
70.188.162.167



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 Re: 1989 Cummins Modification in reply to T in NE, 12-22-2013 11:03:26  

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
70.188.162.167



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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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Mopower

12-03-2013 12:11:28
64.208.152.149



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 Re: 1989 Cummins Modification in reply to PretendFarmer, 12-03-2013 11:59:29  
This is a learning process. I like the mechanical simplicity. I'm currently running a 1995 F250 5spd 4X2 7.3 Powerstroke at about 325hp with no intercooler. It's simply just better injectors, full 3" exhaust from turbo back, and a mild program that will soon be bumped up to several settings with some gauges. It does a great job even though it's a beater. It's not the simplest thing to work on. I can see driveway on both sides of the old Cummins when I lift the hood.

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