Diesel UTV horsepower

[DieselBound]

Yes, more fuel. BUT, IDIs are MUCH different than direct injection engines. I spent enough time reviewing HP increase to a 7.3L IDI Ford that I had to know that it takes a TON of money to eek out any reasonable HP increases. And as far as this topic goes, I followed a guy with lots of money to burn who tweaked his Polaris Brutus (Yanmar) with a turbo and had actual numbers on what that got him- it wasn't worth it (for anything other than a science project): and, it ain't science if you can't measure it! Again, upping HP can break other stuff.

I've got three DI engines in my stable: two VW TDIs (ALHs with performance mods) and my 94 Cummins (fueling and boost turned up). I wouldn't waste my time tweaking an IDI; especially not on a UTV. YMMV.

 

[Industrial Toys]

I simply wouldn't buy anything where "STOCK" wasn't what suited me.

 

[DieselBound]

^^^ Exactly!. But, sometimes you buy used: which is why my used vehicles have performance mods. Seems that one always WANTS more power. Comes down to what one really NEEDS. When I need more power I go rent it (because if I need it more often I'd have it already).

 

[finn1]

The problem with simply adding a turbo to an na Diesel is twofold. First, to do it properly, the piston bowl, nozzle spray pattern, and cylinder head swirl or prechamber geometry have to be reoptimized for decent performance.

Then thereç—´ the matter of structure robustness and head gasket durability. Idi engines generally have a compression ratio of about 21:1. Even adding a small level of boost drives the cylinder pressure to far exceed any safety factor that was designed into the basic block and head structure, head gasket capability, piston temperature and pin Boss strength, and bearing load and crank strength.

The increased fuel rate required to actually use any new found boost and airflow affects valve bridge and piston crown integrity..

Any back yard mechanic can slap on a junkyard turbo and jack up the fuel rate to increase power....but for how long.

The other part is that these small vehicles are often å*µear bound? ie speed is limited by Max engine governed speed, not road horsepower limitations. In order to go faster without changing gearing, you have to spin the engine faster, which is another recipe for disaster.

If your pockets are deep enough, go for it.

Itç—´ only money.

 

[DieselBound]

^^^ Thank you for adding in the technical details. Piston bowls are huge factors. DIs have them. IDIs basically just have reliefs for valves because their fuel is mixed outside of the combustion chamber.

I know that 7.3L IDIs have weak head gaskets. Ask me how I know! And that was with a bone stock motor. It's why I decided to not spend any money in repairs and opted for my 94 Cummins (stock motors can take a fair increase in power without any real concerns; same cannot be said of stock transmissions! [performance clutch is a LOT more expensive than for my TDIs!]).

 

[Industrial Toys]

I demand the HIGHEST quality, but am just not a high performance kind of guy. Give me something that just starts, runs, doesn't break down and costs me a lot of headache, downtime and MONEY!

 

[finn1]

Believe it or not there is a lot of computer modeling and prototype dynamometer testing to optimize the piston bowl and prechamber geometry on an IDI to maximize performance and fuel economy and minimize emissions. Lots of work as in tens of thousands of man hours and dunk time.

In the end, though, the IDI from any manufacturer is a dirty engine.

It’s advantage is relatively low pfp, making the structure inexpensive to produce, and low fuel injection pressure requirements, making the fuel system relatively inexpensive.

Well over a million 6.9 and 7.3L engines were sold in a ten year production run. Not bad for an engine that was tooled and designed to be profitable at less than ten thousand per year volumes.

 

[i7win7]

Re: Diesel UTV horsepower, Thoughts on Teir 4

If you want a high performane UTV get a Mahindra ROXOR and mod it like this guy

STREET LEGAL Mahindra ROXOR - YouTube

 

[DieselBound]

And here's the mic-drop:

PAST PROJECT - Electric UTV Terra Torque Drive™ AWD Torque Vectoring Technology Demonstrator Video on Vimeo

Everything I have is slow. To respond to Industrial Toy's last post I will note that my "performance mods" are really "upgrades." I have made "upgrades" to my vehicles to make their performance SAFER. Cars stock were 90hp, hardly enough to get out of their own way (and when you're running around a lot of tractor trailer rigs it's nice to know that if need be you can get out of harms way- note that my wife drives one of such cars). My truck needed more oomph to provide for towing my trailer and tractor (not a regular need): the mods are very mild as 5.9L 12valve mods go. My cars and truck will be running our roads long after most everything else has crapped out.