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Performance chip for C9

Yahoo Message Number: 92532
Has anyone installed a performance chip on a cat C9 and achieved better MPG and more HP? MP-8 chip or any other mfg

Re: Performance chip for C9

Reply #1 –
Yahoo Message Number: 92533
I have recently installed a washable K&N filter and Aero muffler on my C-9. I don't know how it impacts my mileage; but, believe it has improved my climbing in the mountains. It may be due to the lighter load I am carrying in my wallet. I was shocked at the design of the muffler they took off my coach as it seemed very restrictive. I seem to be running at 60 mph at about 1000 rpms less than prior to the change.

Dan 2006 Allure 31348 C-9

Re: Performance chip for C9

Reply #2 –
Yahoo Message Number: 92536
Dan, where did you purchased the Aero Muffler, I had read they went out of business?

Thanks, Mike 03 Allure 1st Ave. #30898

Re: Performance chip for C9

Reply #3 –
Yahoo Message Number: 92537
Mike

I bought it from Junction City Muffler in Junction City OR and I don't believe Aero is out of business because I talked to two other shops about a new muffler and both recommended the Aero. There are two sizes of Aero muffler and I went with the larger Turbine XL as it is quieter. Junction City bought up the exhaust components from the CC Auction and so they had the mandrel formed 90 degree 5"? bends that were needed.

Dan 2006 Allure 31348 C-9

Re: Performance chip for C9

Reply #4 –
Yahoo Message Number: 92542
Dan,

Not to disagree with you, but a muffler and air intake change should not affect the RPMs at a given speed. The RPMs required for a given speed is a function of the mechanical gear ratios in the transmission and differential. The air intake and muffler do not affect this ratio.

Mikee

Re: Performance chip for C9

Reply #5 –
Yahoo Message Number: 92543
Dan,


Are you sure it is 1000 RPMs instead of 100 RPMs? 1000 RPMs would be a lot when my C-9 only turns around 1500 RPMs at 60 MPH.


Jock Vargo

2005 Inspire
51428


Re: Performance chip for C9

Reply #7 –
Yahoo Message Number: 92554
Mikee

You are certainly more qualified than I to discuss this matter and I recognize the situation you describe with my stick shift jeep. But, I pay very close attention to my RPMs and coming down from Junction City to San Diego ( a trip I have made many times) I was able to make the mountain passes without exceeding 1500 rpms when in the past the transmission would kick me up to 1600 to 1800 rpms. Do you have any ideas on the air filter and muffler change? I would think that whatever the amount of extra power produced the engine is going to climb stronger before it has to downshift.
I was shocked when I was shown the old muffler and wish I had taken pictures.

Dan 2006 Allure 31348 C-9

Re: Performance chip for C9

Reply #8 –
Yahoo Message Number: 92556
Don,

Third through sixth are lock up. No slippage.
George in Birmingham '03 Magna 6298
George in Birmingham
2003 Magna 6298

Re: Performance chip for C9

Reply #9 –
Yahoo Message Number: 92557
So the statement is not true for first and second with the Allison but still being a generalized statement it does not fit all cases. I have always been under the impression that only 6th was a lock up overdrive selection. Maybe I am confused with my Liberty. Don Seager

Re: Performance chip for C9

Reply #10 –
Yahoo Message Number: 92558
Yeah Don, I think you are thinking of the application in autos.

In the MH3000 and MH4000 as well as the 3060 and 4060 there is even lockup in second gear. When upshifting from first to second it is not locked but becomes locked before the shift to third. Most of us feel the transition to locked second as a shift. Third gear and up are all locked.
Hope you and Mary are doing well in a home without wheels.
George in Birmingham '03 Magna 6298
George in Birmingham
2003 Magna 6298

Re: Performance chip for C9

Reply #12 –
Yahoo Message Number: 92563
Hi Dan,

If I am reading this correctly, you are saying the transmission is staying in a higher gear than before the muffler and air intake. This is entirely possible.

Mikee

Re: Performance chip for C9

Reply #13 –
Yahoo Message Number: 92564
The Allison is in lock up, depending on programming, usually in 2nd thru 6th.

Mikee

Re: Performance chip for C9

Reply #14 –
Yahoo Message Number: 92565
The shift sequence goes something like this, again depending on programming, 1st, 2nd, 2nd lockup, 3rd lockup, 4th lockup, 5th lockup, 6th lockup.

Mikee

Re: Performance chip for C9

Reply #15 –
Yahoo Message Number: 92572
W seem to have veered away from the original question, the performance chip:

I had good results using a performance chip in a Cummins ICB but I too would like to hear if anyone has tried it in the C9.
Jim Coshow 2005 Inspire 51501

Re: Performance chip for C9

Reply #16 –
Yahoo Message Number: 92573
Jim, if you didn't get my message when you posted this, I'll go through it again. We've been in the performance business since 1959 and test many products, and the TS kit for the C9 was one of them. We've tested other "$69" kits in various cars and found them to be totally worthless and introducing a new computer message on the dash that wouldn't go away until we removed them. The C9 mileage test went from 6.6MPG to over 10 on the Silverleaf and the performance increase was very noticeable even on a 30-ton Country Coach. We have this kit advertised for $399OBO on our site, or call me directly at 253-565-3578. Doug Nelson (www.aaamarine.com)

Re: Performance chip for C9

Reply #17 –
Yahoo Message Number: 92574
Jim

Filter and exhaust are part of the performance equation. I have talked with several performance diesel shops regarding performance upgrades to the C-9. While many want to sell you the complete package which includes filter, muffler and chip others have recommended a more conservative approach which is to start with filter and muffler and evaluate. In my case I was concerned with the potential impact of the chip on my extended warranty.

Dan 2006 Allure 31348 C-9

Re: Performance chip for C9

Reply #18 –
Yahoo Message Number: 92578
The torque converter will olny lock up when the pump vain speed (rpm) is equal to the ourpur rotor speed (rpm).
Don Seager

Re: Performance chip for C9

Reply #19 –
Yahoo Message Number: 92581
If that were the case it would never lock up except when coasting downhill. The driven will never exceed the speed of the drive under load. This is the reason for lockup, direct coupling and increased fuel economy as well as reduced converter temps.
Most 4000 series are programmed for 1st converter and 2-6 lockup. When under heavy load it will downshift rather than unlock the converter.

Mikee

Re: Performance chip for C9

Reply #20 –
Yahoo Message Number: 92582
I think I would be cautious to mess with the computer and try to get more from this engine. Its my understanding the c-9 has been rated at 400 hp for rv use only and the normal use in trucks would be less hp. I would be concerned with turning it up any more. One thing to note is the software version you may have might not be current. When I was having trouble getting our inspire to pass emissions here in Washington I took it to our Kenworth dealer and had them re-flash the software with the current version. I have been happy with the performance of the c-9 in our inspire. You may want to run it in to confirm what version of firmware your currently running.

Rod

Inspire/Magna

Re: Performance chip for C9

Reply #21 –
Yahoo Message Number: 92583
I didn't make that up. Came straight from the horse's mouth. I never said exceed. I said equals.
Don Seager

Re: Performance chip for C9

Reply #22 –
Yahoo Message Number: 92585
Under load the driven will never reach equal speed of the drive. It is a fluid coupling with slip. That is the reason the lock up converter was created, fuel economy.
You do not say who the horse's mouth is but that is an incorrect statement.

Mikee

Re: Performance chip for C9

Reply #23 –
Yahoo Message Number: 92586
Ok, I will inform Allison of their error

Don Seager

Mbaul@... wrote:

Under load the driven will never reach equal speed of the drive. It is a fluid coupling with slip. That is the reason the lock up converter was created, fuel economy.
You do not say who the horse's mouth is but that is an incorrect statement.

Mikee

Re: Performance chip for C9

Reply #24 –
Yahoo Message Number: 92587
Let me know who at Allison. I will be happy to have a discussion with them. I was a Detroit Diesel/ Allsion Engineer years ago. Also taught the Allison to techs.

Mikee