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Old 03-29-2017, 10:24 PM   #1
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ISL 9 question

Has anyone had a 380 hp ISL 9 upgraded to 400 or 450 hp? I've got a 2013 Phaeton with an Allison 3500 (I believe) and would like the 20% boost in torque that comes with upgrading. Any thoughts on the upgrade? Thanks. And yes, this is my first coach and experience with DPs.
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Old 03-29-2017, 10:31 PM   #2
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Assuming your 380 Hp actually is a 9 liter ISL, I'm guessing the engine could withstand the upgrade, BUT, keep in mind that all that increase in HP will burn more fuel and create much more heat. The cooling system for 380 horses may not be capable of cooling 450 horses. There may be other side effects of the upgrade besides just the extra heat, but I would not worry about the Allison 3000 tranny not handling the added power because that is what is behind my 450 ISL.
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Old 03-30-2017, 05:20 AM   #3
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When I looked at the specs. of the ISL @ 400 and 425 HP the increase in torque was negligible and could not justify the big $$$$'s to have Cummins reprogram the engine to those HP's. While I can't do 65 up any sort of big hill, I can hold 55 nicely and am in no great hurry.
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Old 03-30-2017, 08:58 AM   #4
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Allison MH3000 is rated at 1200 ft lbs. Cummins 380hp are 1150 ft lbs....
I've looked into larger couches with larger engines. Guess what? No improvement in weight to power ratios.
380s are under the 100 lbs per ft lbs ratios, about as good as you can get.
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Old 03-30-2017, 09:56 AM   #5
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The last ISC were 380hp 1050 Tq. They stopped building them in about 2012. Are you sure you have an ISL. With a 2013 it could still have a model year earlier engine. Here is a link for 2013 model it looks like an ISC to me.
https://www.rvusa.com/rv-guide/2013-...40-qbh-tr14830

When I asked Cummins about upgrading my 425 to 450 they said not possible with my engine. That is the same answer I have always got from Cummins on other engine also a 330, ISC.
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Old 03-30-2017, 04:29 PM   #6
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Quote:
Originally Posted by DAJO View Post
The last ISC were 380hp 1050 Tq. They stopped building them in about 2012. Are you sure you have an ISL. With a 2013 it could still have a model year earlier engine. Here is a link for 2013 model it looks like an ISC to me.
https://www.rvusa.com/rv-guide/2013-...40-qbh-tr14830

When I asked Cummins about upgrading my 425 to 450 they said not possible with my engine. That is the same answer I have always got from Cummins on other engine also a 330, ISC.
Thanks. I have a 2013 Tiffin Phaeton. I will contact Tiffin with my vin and ask for the serial number of my engine. At the FMCA rally the Cummings guy told me I had an ISL and gave me the brochure on it, which is where I saw that the same basic engine came in 3 HPs, which is what gave me the idea. This runs great at 380 ... thought it might run even better with more torque.
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Old 03-30-2017, 06:46 PM   #7
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When coach is still under Cummins warranty there is higher cost to re-flash the computer. 5 years ago a guy with a 450 HP ISM wanted to up grade to 500 still under warranty and the cost was 1700$ because Cummins says that what they do is sell HP. After warranty has expired have heard folks say about 700$. I don't think the trans won't handle it is a reason not to do it.
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Old 03-31-2017, 05:39 PM   #8
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Ours, according to Cummins quickserve data is an ISL 9 at 425HP and 1250lbft.
and they have even other names for it:
Marketing Model Name Service Model Name EPA Model Name
ISL 425 ISL CM2150 9CEXH0540LAM


no wonder we get confused....
BUT, being a ford diesel owners for years and years and liking them, this cummins is a stout engine that hasn't given me a hiccups in 30k miles!
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Old 03-31-2017, 11:17 PM   #9
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Home again - mpg report

Just got back from Phoenix ... the mpg from Montgomery, AL - to Phoenix via Galveston, Big Bend NP, and Phoenix was 9.9 ... coming home via I40 and going up to 7200 feet in Santa Fe was 10.3 ... ran a comfortable 63ish both times (maybe a little higher on the way out). So, maybe I should be quite happy with my current configuration and not worry about adding ponies or torque.

Thanks for all the feedback - I do appreciate learning from others - I won't live long enough to make all the mistakes myself.
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Old 04-01-2017, 04:18 AM   #10
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Good deal - That is 'fee-nominal' mpg - I would be tickled pink with it (if I really watched how many mpg my house got )
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Old 04-02-2017, 09:32 AM   #11
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OP - Great MPG! And yes I'd suggest leaving this as they are for awhile, and get comfortable with the coach. Read up on some of the tips about pro active downshifting. The engine and transmission combo ECM's are reacting to after a grade has started. Your eyes can see that grade in advance, downshifting to a lower gear and getting the RPM's up to the sweet spot for you specific engine, can make or break the climbing of a long hill.

Suggest you get you specific engine number, and call Cummins themselves. They will tell you your exact engine, most likely the ISC based upon the MPG you reported. And ask if they can point you to a chart that shows power curves for both HP and Torque, this will give you a good range of RPM's to live within while hill climbing. (SWAG of 2000-2150 being a good RPM to start by say downshifting to 5th before the hill climb starts. Then if the run up the hill slows you down enough for RPM's to drop to probably the 1750-1800 range, downshift to fourth. Repeating going down the gears as needed. (On most grades once I'm in fourth, I seem to be able pull the rest of the hill. But on some really steep and long grades, and when our water and fuel tanks are both full, or if I get caught in a line of slower moving trucks, dropping down into third is sometimes required. Top of I70 going East towards the tunnels last year, we had to go down to 2nd maybe an 1/8th of a mile from the top where you enter the tunnels. Had to wait for truck to pass me before I cold swing out to pass the slower moving truck in front of me, and lost my RPM's in third. At our weight, and medium size block ISL370(Cummins Reprogramed to 400.) I just did not have the HP/Torque to regain speed.)

Anyways, even different model years of the same engines, can have variances in peak HP/Torque and the power bands can vary too - Cummins should be able to get you to that info with the Serial of your engine.

Enjoy!
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Old 04-02-2017, 10:11 AM   #12
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Fee-nominal?

Quote:
Originally Posted by JohnBoyToo View Post
Good deal - That is 'fee-nominal' mpg - I would be tickled pink with it (if I really watched how many mpg my house got )
I don't know what fee-nominal means. This was the mpg reported by my info center on the dash ... which I'm still trying to figure out. Probably a question for a different forum, but any comments on those after market info centers?
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Old 04-02-2017, 11:11 AM   #13
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Disregard question about monitoring ... found the silver leaf thread.
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