RTV 1100 Turbo

[Powersports4life]

Ya exactly! A little steep! I'm hoping the company you purchased it from replys to my email with good news.

 

[Powersports4life]

So looks like tmrw I will order a turbo kit. I'm gona bite the bullet.. Can any one tell me what I need to do to adjust the pump so I can pass it on to my installer? Also on another thread a guy said he adjusted the throttle so it idled higher and this is also supposed to help. Any other tips or suggestions would be appreciated. Thanks in advance.

 

[Powersports4life]

Ordered sfs specialties turbo kit today. I spoke with the guy down there and he was not aware the turbo was not posted on his site so he put it back on his website. It was an easy choice goin with sfs compared to swag because there kit is $1000 dollars cheaper!!! $ 1900 is even hard to swallow! But I figure I'm already into this machine for a couple bucks so I may as well have it perform to it's max potential for $1900. The guy down there was very friendly and offered any assistance I needed in the future. Very nice to deal with. The kit also comes with detailed instructions that include information about how to tune the machine to accommodate the extra power. Should arrive next week... Then time to have an exhaust fabricated.

 

[Powersports4life]

Hi Guys

I am new to this forum but have been reading your threads on this topic for some time now. I thought it was time to sign up and put my two cents in.

I am from Australia and work for KTA and I have been working with the Kubota RTV range for a few years now so I may be able to share some technical knowledge with you guys that may shed some light on a few issues that you are having.

Firstly you need to be aware of the limiting factors of a HST transmission in terms of output torque. The RTV obviously is powered by a diesel engine that is normally aspirated that is non turbo charged. Whilst adding a turbo will increase engine output, the final output at the wheels is in fact limited by the capabillities of the HST. This is governed by the flow of the variable pump, variable assist motor and fixed displacement motor and the ability of these three components to reach maximum system pressure and desired output torque. So regardless of how much input power(from the engine) goes into the HST, the torque at the wheels will always be the same if the flow rates and pressure settings in the HST remain the same.

When the RTV was designed the engine output was matched with the input horsepower requirements of the HST to obtain optimum performance by reaching the desired pressure settings during maximum flow rates of the pump and motors.

So to increase output torque of the transmission what in fact is needed is to increase the flow rates of the HST pump and motors. This then may need more input power from the engine to compensate for the increased flow.

I hope this clears a few things up and I haven't confused anyone. I am happy to answer any questions regarding the RTV.

For your information, there is no turbo version of the D902 engine that is fitted in the RTV900. There is infact a turbo version available of the D1105.
Something else for you guys to consider is that if you compare two engines of the same model (same # of cylinders and displacement), one turbo and one non turbo. They will have different injection timing and different compression pressures and compression ratios. This is achieved using different piston heights and the injection timing is adjusted through shims on the injector pump.

:confused2:

Anyway, better go and do some work. Good luck with your projects and I look forward to hearing from you all.

Cheers. Maso.

To what extent can the flow rates be adjusted of the HST pump and motors be increased? Is this very limited? Do you have any additional info you can give me? Thanks