So I bought a 660

You not an eco boost fan Stang? My buddy has one, it's a pullin machine.

 

Yep. If I had a 660 here to test against the 372 I'd do it. It wouldn't be real fair with the 372 being ported though.

 

Same type of bar ................
I will cut to the chase ...........

Setting a saw with the tach is what the factory recommends, and they are in business to sell saws - kind of a conflict of interests for us isn't it ?

Setting your saw with a tach does not account for the type/length of B&C nor does it account for the wood you are cutting
When a saw does more work, it needs more fuel.

IMHO, you can use a saw set to factory specks with a tach and it will cut, but will it cut at top performance ?

We are allways trying to squeeze out more power from our saws, and I am allways seeing reccomendations for people to set their saws with a tach.
Setting a saw to operate under the load it will see requires tuning in the wood ............

this tach thing is so overrated - especially for someone who knows how to tune a saw.
If we are going to teach someone how to adjust their saw, why not do it the best way ............... OK who judges the best way ?
Let the saw(s) speak for themselves ............... when they scream, shut 'em up with more fuel until they sing a good tune of 4 stroking and clean running under load, then look at cut times. This thread is a perfect example of how not enough fuel will make any saw roll over and puke

Lastly, just grab an IR temp gun and point it at your favorite spot on the cylinder ............... I will wager that you will see lower temps (which means longer life) with the saw tuned in the wood compared to a saw tuned with a tach, especially with an increasing load !!

There will be times that tuning with the tach and tuning in the wood will be the exact same adjustment, but if you load up your saw (like we all do with longer B&C and dogging in) and you tuned with a tach, it probably could use more fuel and you probably will have a cooler running saw with better power by tuning in the wood you are cutting

 

and not to be a nerd, but to put into perspective I 'll add a few bits.

Hp is a calcuation derived from Tq.

Torque is a measurement of work done, usually in a rotational aspect. (think of torquing a bolt to spec). Horsepower is the measurement of the rate the work is done. example, It took 4 hp to torque the bolt to 40 ft/lbs.

Torque is what does the work, such as moving a car or truck from a standing stop to accelerating, cutting wood, building pressure in a hydraulic system, etc. Horsepower is what keeps the car, saw, etc moving. The more torque an engine makes, the higher the HP will be. there are many variables, but that is the gist of it. That is why when you look at the 660 dyno graph, the rpms at which they all peak is different, because the engine flow characteristics have changed with porting, muffler mods, etc, so the time at that rpm has changed. . In the cut rpm is the torque and that's what we all care about at the end of the day. as you increase airflow and fuel in porting or muffler, it changes the rate of change in time of torque and thats why the rpm differ between the three saws for the horsepower measurement.

 

When I tune by ear I always end up 500-1k rpms under spec.

 

Hopefully on the fat side !

 

Yeah big time. Once they get to 12k plus I can't tell that much difference until they get to quit 4 stroking. The 372 the other day hit 15.2-15.4k. I tuned it down by ear and was at 12.4k. I used the tach to get back up to around 13.7k. It runs better around there. It will 4 stroke way on up there.

 

I was amazed how fat I tuned my saw once I bought a tach.

 

That was me. 13k sounds like 15k

 

Mike u sayin the ported 372 would rough it up? How bout if the 660 was ported in wood under 25? I mean 21cc more has to mean something??

 

Good post. I rarely ever use my tach since getting rid of my 7900. I hated that rev limiter for ear tuning. A saw that is pig rich is no good either. but I always found if I checked my saws set by ear with a tach, they were lower rpm than spec

I'm not. Two buddies have them. both with tuners. They get v8 gas milage and won't hold their own towing like everyone states. one guy hauls an enclosed race car trailer, the other hauls skis and quads on hunting trips. both 8-10K loaded. they won't hold 70mph, they get 6-8mph. I'm not a fan and I'm a ford guy. I love turbos, just not a fan of the eco-pukes. not for someone that has a truck they use. now for a soccer mom that hauls kids and the occasional load of firewood, sure they are ok, i guess. i'm don't like the raptor either, another posser truck. all that awesome stuff to do cool things and they are never off road or haul anything. they are trophies driven around that say, hey, look at my status.

 

There was a thread on AS last week and the guy tested a 660 against a 461 with various bars, chains, and wood. The 660 outperformed the 461 everytime.

 

A new 5.0 F-150 will outperform an old big block even with a load. A 6.2 would definately run away expect a raptor would be way overloaded with 12k, it can only tow 8k.

 

Whatever....try doing this in a Silverado:

 

For heavy loads, a Diesel engine is the clear choice. For dropping the kids off at school and running to the grocery store, I'm sure the ecoboost is wonderful.

Oh, and that raptor costs dang near as much as a fully loaded f-350 diesel!

 

That's weird. His gets 10-11 towing 10k. He took it from WV to FL to pick up a tractor he bought along with a bunch of attachments. Never dropped below 4th gear the whole trip, even crossing the WV mountains from VA, and still got 10MPG. The empty mileage isn't anywhere near what they claim though.

 

ding ding ding...

 

I like the idea of the truck. I hate that they are 3x the price that normal working people can afford. I hate that people that have them are a bunch of posers in general, and 99% of them won't tow a thing, ever see off road or drags strip. I didn't say they weren't 100% kick azz. i'd love to have the motor, or the suspension on anything but the reality is its a status symbol for people.

 

Not sure if you watched the whole video, but I agree with you. Some people got more $ than brains/need for a true off road machine.