Timmyb Posted September 23, 2013 Share Posted September 23, 2013 What do you guys think the best cruising rpm is at 60mph? Both for fuel economy and pulling? I've got a 2v 300hp and I can get a cheap rto11613 13 sp single overdrive and 3.9 diffs. This combo should see me sitting at 1800rpm at 60mph (100kmh). What do the e6 engines like to run at? Quote Link to comment https://www.bigmacktrucks.com/topic/32895-best-cruising-rpm-for-e6-300/ Share on other sites More sharing options...
MHfred Posted September 23, 2013 Share Posted September 23, 2013 My 4 valve E 6 300 max RPM is 1700. Based on my engine charts 1300 to 1400 is best fuel economy and has 290+ horse power and 1000+ foot pounds torque. I have 4.00 rears, .73 OD (RTO11609B), 11R22.5s and can run 70 at 1700. Quote Link to comment https://www.bigmacktrucks.com/topic/32895-best-cruising-rpm-for-e6-300/#findComment-208027 Share on other sites More sharing options...
Timmyb Posted September 24, 2013 Author Share Posted September 24, 2013 Cheers for that. Do you think that would be the same for the higher reving e6? Being a narrower power band I'd imagine it would be a few hundred rpm higher. Quote Link to comment https://www.bigmacktrucks.com/topic/32895-best-cruising-rpm-for-e6-300/#findComment-208170 Share on other sites More sharing options...
Superdog Posted September 24, 2013 Share Posted September 24, 2013 My E6-350 really likes 1600 to 1650. It has the 2090 Mack trans. with .71 OD and 4:42 rears.That put's it about 63 mph. Quote Link to comment https://www.bigmacktrucks.com/topic/32895-best-cruising-rpm-for-e6-300/#findComment-208171 Share on other sites More sharing options...
Timmyb Posted September 24, 2013 Author Share Posted September 24, 2013 Thanks a lot for your in put. I was thinking 1800 was a tiny bit high. I'll aim for about the same 1600-1650 rpm. Quote Link to comment https://www.bigmacktrucks.com/topic/32895-best-cruising-rpm-for-e6-300/#findComment-208242 Share on other sites More sharing options...
rsb502 Posted October 10, 2013 Share Posted October 10, 2013 What do you guys think the best cruising rpm is at 60mph? Both for fuel economy and pulling? I've got a 2v 300hp and I can get a cheap rto11613 13 sp single overdrive and 3.9 diffs. This combo should see me sitting at 1800rpm at 60mph (100kmh). What do the e6 engines like to run at?A .74 OD in the 13 spd and 3.90 rears with a 42" tall 11R22.5 or lo pro 24.5 would put you @ 77mph @ 1800 rpm, 69mph@1600rpm, I am like Superdog keep it close to 1600-1650 and itll pull great, if you run it over itll just pull down to 1600 on a hill anyway. If your going to go to the 13spd, or any eaton trans with a .74OD, you should shoot for a gear ratio around 4.42 to 4.17, 4.42 will get you doing 61mph@1600, 4.17 would be 64mph, I think a 4.64 would be a little steep for fuel mileage it puts it close to 1700 rpm @ 60, but it would probably pull great around 55-60mph or 88-95kmh Quote "Any Society that would give up a little LIBERTY to gain a little SECURITY will Deserve Neither and LOSE BOTH" -Benjamin Franklin"If your gonna be STUPID, you gotta be TOUGH" "You cant always get what you want, but if you try sometimes you get what you need" Link to comment https://www.bigmacktrucks.com/topic/32895-best-cruising-rpm-for-e6-300/#findComment-211116 Share on other sites More sharing options...
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