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T300 EGT Limits

PostPosted: Wed Oct 12, 2016 2:23 pm
by Tony
Now that my T300 is well beyond warranty, I'm ready to crank up the fuel pressure on the injector pump. Get me some "free" horsepower. In doing so, I'd rather not nuke my engine, so I'm turning to the masses (here) to get some insight and guidelines.

1) I am a HUGE fan of being aware of what my engine is doing. If I built a CTL, I'd have gauges for every temperature and pressure on the unit. As such, I intend to install an EGT sensor in the header and mount a gauge in the cabin. Same as I've done with diesel trucks. Trucks typically prefer less than 1300* on EGT's. Is a Bobcat similar/same? Any tips for where to drill the header for the EGT sensor? How many turns on the pressure screw to get maximum performance without black smoke? I was going to crank it until I see smoke and then back it off, but if someone has done the work, I'll start with that.

2) I would like a gauge for turbo boost. What boost levels does the T300 reach? Will a 15psi gauge give me good clarity? Any need to care about vacuum? Since the engine typically runs at a constant RPM (not like a car/truck with shifting gears and such), vacuum may not be a concern. A gauge like this might be nice as I can put EGT, boost and a couple other things in a single gauge...

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Thoughts?

Re: T300 EGT Limits

PostPosted: Wed Oct 12, 2016 2:25 pm
by Tony
Tazza wrote:Would EGT readings really be needed if you aren't going to be putting lots of boost into it? That is the other issue, how much boost can you safely put into it? From stock, i didn't think they had much, i thought it was only a few PSI.

The other issue is can the pump provide enough fuel? If you are only adding a little more boost, i see no issue, just don't go crazy.

I'd like to hear how you go with this, it would be good to see dyno data on it, but that simply isn't going to happen. :)

Knowing EGT levels may not be critical due to, as you pointed out, small increases in PSI. I would just like knowing.

I expected factory PSI was below 5, but the gauges available seem to be 0-5, 0-15 and 0-30+. I figured 0-5 would be too little and 0-30 wouldn't give me much clarity (is that 10 psi or 15 psi?).

The pump will be working a little harder to maintain the higher fuel pressure. That's one of the concerns I have. Can it maintain this extra workload without premature failure? Is it already working at its 90 percentile of maximum?

I have considered dyno testing. The dynos I have access to are all wheel/drum dynos. That wouldn't work for a CTL (maybe a skid steer?). I need a dyno I can drive with a belt. I could loop the belt around the engine pulley with the back door open and get a number. With all the misinformation running around concerning the numbers with the T300/T320, this would end a lot of unfounded tales.

Re: T300 EGT Limits

PostPosted: Wed Oct 12, 2016 2:29 pm
by Tony
Hotrod1830 wrote:If you have been turning up the wick on trucks, you already know that some of them wont handle it and you cause more headache than it's worth. My suggestion, leave it alone and use/ enjoy it.

I am very controlled and careful in performing these types of "upgrades". As a result, I've been rewarded with trouble-free results... so far. Thanks for the suggestion though.

Re: T300 EGT Limits

PostPosted: Wed Oct 12, 2016 2:32 pm
by Tony
reaperman wrote:I'm with hotrod, I wouldn't mess with it. Where are you planning on using the extra power? With skidsteers, traction is the name of the game. And that issue is already solve with tracks vs tires. You stock engine has more than enough ponies to spin the tracks. If more hydro power is needed than a high flow machine would be in order.

My T300 has almost every option, including High Flow.

Re: T300 EGT Limits

PostPosted: Wed Oct 12, 2016 3:18 pm
by Tony
My reasoning behind even considering this modification is something I've noticed in using my machine for mowing.

I built a 3-point PTO attachment that drives most standard tractor implements. I use it for a rotary cutter and a flail mower primarily. I also use it for an auger and a box blade. When using the mowing attachments, if I'm going up a slight incline (is there any other type in LA?) and I'm lifting/tilting the attachment, there is a slightly noticeable change in engine pitch. More so with the rotary cutter (heavier I guess) than the flail mower.

May seem nit-picky, but a couple extra PSI may help and I really don't think it will hurt anything if done correctly.

Re: T300 EGT Limits

PostPosted: Wed Oct 26, 2016 4:42 pm
by Tony
The vague description of how to increase fuel pressure is posted below:

On my S-160, There is a cap over a bolt by the throttle linkage. Take the cap off, its approximately 1 1/2'' long. Once that cap is off, there will be a bolt that turns into the engine, thats one of the jam nuts, put a wrench on that, then there is another nut right next to it that looks like a cap. It has a round end, one inch long roughly, take that off, there will be a copper washer don't lose that. Once the cap is off, loosen the nut that turns into the engine, only LOOSEN it. Once you have that loosened there is an allen head at the end. Turn it OUT, I turned mine out about 2 turns. Once you get it where you want it, put everything back on tighten everything back up and enjoy your new power.


Poorly worded and described, but the premise should be enough to follow. Once I complete the process, I'll post a much better description with pictures.