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Old 09-30-2007, 11:32 AM   #1
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We are thinking up-grade a Super C Kodiak 8.1
v-8 5, speed Allison Transmission.W
Researching I find that the 8.1 has more HP more torque than the Diesel. Numbers are god but how do they perform in the real world. OR What would you buy the diesel or the gas?

Thanks
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Old 09-30-2007, 11:32 AM   #2
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We are thinking up-grade a Super C Kodiak 8.1
v-8 5, speed Allison Transmission.W
Researching I find that the 8.1 has more HP more torque than the Diesel. Numbers are god but how do they perform in the real world. OR What would you buy the diesel or the gas?

Thanks
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Old 10-03-2007, 04:55 PM   #3
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Swannee:
We are thinking up-grade a Super C Kodiak 8.1
v-8 5, speed Allison Transmission.W
Researching I find that the 8.1 has more HP more torque than the Diesel. Numbers are god but how do they perform in the real world. OR What would you buy the diesel or the gas?

Thanks </div></BLOCKQUOTE>

More HP, but not even close on Torque. Diesel is much better.

Diesel also has an exhaust brake which I'd love to have in my 32.5 ft Jayco (miss is from out DPs)

MPG much better with the diesel. The best we've had in four trips not towing is almost 8 mpg.

Ours has the 6 speed Allison and 6th is another overdrive and without it fuel consumption would even be higher. The 8.1 with 6 speed turns at around 1890 rpm (according to our ScanGauge) at 60 mph.
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Old 10-03-2007, 07:10 PM   #4
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We recently bought a 2007 Jayco Seneca HD 34S on the Chevy Kodiak chassis with the Duramax diesel motor. Our previous motorhome was a class A with the 8.1 motor. As others have said, the diesel is more powerful and provides better fuel economy. Best of all, it is MUCH quieter in the cab. The 8.1 had to turn at higher rpm to develop it's power and, therefore, was much louder.
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Old 10-03-2007, 07:26 PM   #5
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Paulin, our problem was that we were downsizing from a 40 ft 10 inch DP (bought an almost new park model on the lot next to ours in FLA) and the smallest Seneca was still larger than we wanted to go, as is our 32SS is frankly. But, the key thing is that a Seneca doesn't have enough towing capacity to haul the Tahoe around and the Greyhawk does. We wanted the smallest C that could tow the Tahoe and that is what we have I think.
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Old 10-04-2007, 08:37 AM   #6
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Thanks for the replies on this subject, current class c we had no engine choice the extra bucks are tough to produce.
Price wise "bang for the buck" still leans toward Gas, drove a gas but no diesel. Would like to have a chance to do one after rhe other test drive. But personally The diesel would have to do alot to prove that additional investment.
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Old 10-05-2007, 07:21 AM   #7
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We have a 2004 Gulf Stream Endura with the 8.1/Allison, towing a 2001 Nissan Frontier Crew Cab Pickup. We have only had it a few weeks and two trips. The first trip was intentionally into the Arizona Mountains - from Phoenix to Payson to Show Low and Back through the Salt River Canyon to Globe to Phoenix. The Truck drove Wonderfully - plenty of power, Lousy Gas Mileage (probably only about 6 MPG.) I found this rig at a good price - the only diesel available at the time would have been a 2006 and about $30K more. The second trip was to Benson via Tucson on I-10 - also towing - again wonderful drive - mileage about 7.5. Hope this helps.
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Old 10-05-2007, 10:10 AM   #8
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Thanks Kent & Patty you nailed it. This is what I needed to KNOW. That extra $30K buys a lot of gas. We now and will continue to tow a 99 Jeep 4 down 4600# worth definatly strains the Class C ford v10.Colorado trips flat or 10% grade we get 5.8-6.8 never ever do we see 7.5gpm.
We can deal with the prices we see on 8.1 Kodiaks than the diesel. I agree with everyone else that the diesel would be the best way to go BUT return on investment I have to go with the 8.1 Kodiak with Allison 5speed T1000 transmission.

thanks all
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Old 10-09-2007, 11:17 AM   #9
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We just purchased our 33DS in August and love it. We traded in our Dodge Diesel and Alpenlite 5er. Great power at a resonable price. I agree that I can purchase a lot of gas for the savings between the diesel Seneca, and the gasser especially now with the price of diesel going out of sight.

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Old 10-09-2007, 11:54 AM   #10
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Doug & Jo:
We just purchased our 33DS in August and love it. We traded in our Dodge Diesel and Alpenlite 5er. Great power at a resonable price. I agree that I can purchase a lot of gas for the savings between the diesel Seneca, and the gasser especially now with the price of diesel going out of sight.

Doug </div></BLOCKQUOTE>

Doug, you may want to check out this thread and then have a look under your 33DS.
33DS Compartment heat
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Old 10-10-2007, 03:42 AM   #11
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We have been searching Nation wide for the best price on Super C Jayco, Kodiak chasis with the gas 8.1v-8 and Allison trans. One of the places checked is Whitehorse RV in New Jersey the way things were looking money saved might be worth the trip from Fla. However,their rep called back with info, Jayco no longer offer the 8.1 in the Kodiak chasis.
The search will continue for either a used Jaco super C or another brand. That $10k option for the diesel as I said will buy a lot of gas for the return on the investment. So, still looking..
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Old 10-10-2007, 05:27 AM   #12
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Mike, you will find some info on the cancellation of the Greyhawk on Kodiak here:
Greyhawk on Kodiak discontinued
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Old 10-16-2007, 08:35 AM   #13
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Don, thanks for the exhaust info.I will definately be watching this.

Doug
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Old 10-16-2007, 05:43 PM   #14
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Doug, I crawled under mine yesterday to look around and in particular check the tail pipe hanger as many were reporting it breaking off. It was broken alright just like the others. Clearly, fatigue due to improper hanging and welding. This is not a GM problem - they won't even touch it under warranty since Jayco or its chassis extender did the work.
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