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Old 09-28-2018, 03:49 PM   #41
Signature600
 
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I never want to see 2000RPM in a Cummins unless it's over 35K gross weight.

I geared my 2010 with 3.42's and a 68RFE...87mph @ 2000RPM. I would think a VE would be happy at 1700ish @ 70mph.

Chris
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Old 09-30-2018, 10:07 PM   #42
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Quote:
Originally Posted by Signature600 View Post
Do the S357 if you want to buy one, you'll be pleased I think.

If you can afford it, put a cam and 60lbs springs in it, just because...other than that, the pan gasket will probably start leaking as soon as you put it in, even if it's dry now, and especially if you try and put a new one in it. I really wouldn't worry about anything else.

Chris
I think it would be the best of the "small" turbos I've been looking at, however is it worth $1200 more than a hybrid 58/58/12 or 58/58/14? That's the argument I am having in my head right now. [Price based on buying a used housing for my 58mm HX35 turbo on the shelf]. If it took me from 16mpg to 18.5 and increased area under the curves then I would drop the money right now. Of course that is unknown at this point. I almost have to start with the hybrid and if it does not meet my goals I can keep it as a spare for the Dodge and move to the S357. At the very least we will have the data for someone else to build upon.

I see alot of folks doing through these things in an attempt to make them bone dry, but honestly, I don't get concerned about leaks, especially a cummins. Maybe it's the farm kid talking, but leaks are just the cost of doing business in my eyes. I think everything we own leaks something, we just keep stuff topped off.

Am I the only one who seems to see alot of aftermarket cam failures? That has me a little concerned with a cam swap. Do I need zinc in every oil change? I have a 188/220 Hamilton on the shelf with springs, tappets, pushrods, and beehives, but it was meant for my Dodge with alot more fuel and boost. I would think the Excursion would want the 178/208 or 184/214 cam. However, I haven't looked at reviews of those cams. I see ofelas talking about the 1st gen cam being stout, I wonder if something from Hamilton would help a VE truck more or less than a Ppump or 24v truck?

Quote:
Originally Posted by ofelas View Post
I wouldn't bother with a replacement cam for your intended application.

Besides, the stock first gen cam is the rowdiest one out of any of the 5.9s' factory cams.

Personally, I think pulling your head & doing some cleaning up of the area just below the valve seats is worth the time & effort of R&R.
Thanks for the cam info, do you have the specs handy or a link to the 6BT cam specs? I'm curious now.

I would have to outsource the head work, I don't have the tools or knowledge for that. Also, I'm afraid if I pull the head, I'll be tempted to send it out, oring and port it. Head studs would follow..falling further down the rabbit hole than I should, lol. I'm not saying it wouldn't help though.


Quote:
Originally Posted by SmokeShow View Post
Me personally, I'd like to see it be around 2,000 rpms at 75, not 70mph. Especially since you've talked about efficiency with your wife driving it.

I know it's not apples to apples but cruising in the duramax seems to sip the least if you can stay below 2000rpm as much as possible. 2200rpm I would think would get thirsty, especially pushing that 8000# brick.
I agree, I wish I had an extra gear like a 6 speed Allision has. The numbers I posted assumed I would run 75-78mph in a 70mph zone. The calculated RPM's are in the following post. They are not too horrible. I hope to keep the boost at those RPM's at a reasonable level to help MPG.

Quote:
Originally Posted by Signature600 View Post
I never want to see 2000RPM in a Cummins unless it's over 35K gross weight.

I geared my 2010 with 3.42's and a 68RFE...87mph @ 2000RPM. I would think a VE would be happy at 1700ish @ 70mph.

Chris
I wish I had a 6th gear, say .61, like an Allison. I hope my next build has that option. Current RPM's with a 4R100 4th gear of .71, 3.73 gears, 33" tires.

65mph - 1753rpm
70mph - 1888rpm
75mph - 2022rpm
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Last edited by Bersaglieri; 09-30-2018 at 10:20 PM.
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Old 09-30-2018, 11:39 PM   #43
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I have 450 hp with a VE and a Built 47rh along with 410 gear's and 37's and I'm running a first gen crewcab and it scoot's down the road at 2100 rpm @85 mph
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Old 10-12-2018, 10:11 AM   #44
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Good thread, and great info.

One comment, maybe i missed it? Your VE pump engine, factory intercooled or non? 89 to 91.5 non-intercooled engines ran a 9mm injector hole in the head which are prone to cracking. The 91.5 and up intercooled engines were changed to 7mm injector ports.

Good luck with your build, and at least get some headstuds on your to do list

Sent from my SM-G960U using Tapatalk
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