That's interesting, 6.9's rev higher than 7.3's? Mine de-fuels pretty hard by the time it pulls through 3400. The 2-3 shift is so long while towing that I'd like to have a little more headroom at times.
Yeah, who knows what someone did when the ATS 085 got installed back in the 80s. It could be they messed around with the governor.
From what I have seen they will hold huge power, just dont try to back up a load with one, and gv used to say not to use one during engine braking.
Unless you factor in the convertor slippage, the weight, and the profile of the thing. Even if you could get full power out of the engine at 3500 TPM, which you can't since it's defueling before that, the weight wouldn't let a standard transmission get to 77 MPH. Not to mention the wind resistance which cause even more slippage in the convertor due to having to work harder. Since the online charts all calculate for a 1:1 ratio, they're not factoring in any amount of slippage from a torque convertor.
Now that's probably true. Back in 2015, I "got" to drive one with a 454, th400 (probably), and a 4v carb on it. I was surprised at no OD and not even a throttle body since it was a 1989. It was at least as long as Cubey's was. Maybe a little bit longer. I was driving 55 along a highway for maybe 5 miles total. It felt like I was going quite a but faster than 55. It also took a long time to get there considering what was under the doghouse. The guy I was working for at the time thought that we were going to drive it from Salina, KS out to Taylor Park, CO pulling a trailer of ATV's behind it. I could barely keep the vacuum gauge in the yellow range going along the flattest part of the highway at 55 MPH. I know with everything that I have that it was cheaper for us to take his two Chevy Dura Maxs and each one pull the ATV trailer or the camper than it would have been to try to take that RV. I told him right after he bought it that whoever told him that it would get 15-16 MPG on the interstates was lying to him.Ya but in a big ‘ol motorhome it prolly felt like.....
“Lunatic Speed”
(Space balls reference)
Drop the leading 1 and that's about accurate.
I'm sure that's right. If not on the high side.
I haven't heard either way. From what I do know, the truck 460s (stock) are down on power compared to car 460s. I's guess that RVs came with truck 460s. The differences are in the heads (better flowing and higher compression) and possibly the cam. The 460 that was in my last Dent Side came from a car. It wasn't quite up to the 429 that was in my first Dent Side, but it would pull pretty well. The heaviest that I pulled with it was 14,000 (and some odd) lbs with the load and the trailer. I had no trouble doing the 55 MPH speed limit. I even passed a slow driver who was doing 50. I barely touched the throttle and I was going 65 by the time that I got around and back into my own lane. Maybe that's one that I should have put in the "Stupid Things that You've Done with your Truck" thread. A F150, pulling that much weight on a bumper pull trailer? That certainly would have qualified!
The governor is actually adjustable, called a minimax screw I believe. Located on the back of the injection pump. There is a thread called DB2 Tuning Guide that is a worthwhile read.
The min/max screw is primarily for the low RPM fuel delivery. It's was Stanadyne's solution for keeping the smoke down at low RPMs since the DB2 pumps push max fuel at like 1200 RPM and it tapers off from there. I've never read about it changing the max RPM, that thread included. It does change max fuel when adjusted all the way in a little bit. And it's only on some IP's. The one I have now doesn't have that screw.
So you can adjust that if you have smoke coming out at part throttle let's say?
