| Author | Message | ||
| Pete/RTS Daytona (Pete_rtsdaytona)
Registered Member Username: Pete_rtsdaytona Post Number: 461 Registered: 1-2005 Posted From: 72.189.65.231  Rating: N/A |
"Poor mans Dyno Test" Just got back from a weekend GMC Classic Motorhome rally - Got to show all my old friends in the Club my finished RTS ("The GMC Classic Motorhomes BIG liitle brother" - the RTS was the follow on project to the GMC M/H ) I did remember to bring a stop watch to do my "DYNO TEST" benchmark I've done this for almost every vechicle I've ever owned - I use it to check the preformace of my vechicles when I suspect someting is going wrong or I just want to make sure that everything is still the same. The test is very simple - Just press the throttle quickly and record the times it takes to get to 20 / 30 / 40 / 50 / 60 MPH Here's my vechicle specs 1989 TMC RTS-II Model 06 6V92TA DDEC-ii 277 HP California EPA w/Catalytic converter Allison V731 3 speed lockup tranny with standard .88 overdrive shift points -> 1st to 2nd = 17MPH -> 2nd to 3rd = 33MPH -> 3rd lockup = 45MPH 4.10 Rockwell rear end (with the Allison overdrive that equals 3.60 FINAL DRIVE) 24.5 tires (almost the same outside diameter as 22.5 tires) 65 MPH @ 1800 RPMs / 77 MPH top speed @ 2150 RPMs approx weight 32,000 lbs conditions: flat road - 70 degree day - sea level (Daytona Beach. Fl) Ultra Low Sulfur diesel fuel (loves truck stop) - no a/c or other loads RESULTS 0-20 --> 10 seconds 0-30 --> 15 seconds 0-40 --> 24 seconds 0-50 --> 38 seconds 0-60 --> 57 seconds If I change rear end from my 4.10 to a 5.13 rear -- then I would expect (5.13 divided by 4.10=1.25 times faster times) To compare your vechicle to mine divide your final ratio by (my final ratio of 3.60) and MULTIPLE that valve by my stated timings Pete RTS/Daytona OK GUYS -- HOW ABOUT POSTING YOUR DYNO TEST RESULTS ???????????? | ||
| Bill Gerrie (Bill_gerrie)
Registered Member Username: Bill_gerrie Post Number: 160 Registered: 3-2006 Posted From: 209.50.74.6 Rating: N/A |
Pete That is a good idea. It would let you know if something isn't working just right by comparing one time to another. It will be awhile before I can test mine as I am putting in a new fuel tank that I am having made. Bill | ||
| john w. roan (Chessie4905)
Registered Member Username: Chessie4905 Post Number: 1033 Registered: 10-2003 Posted From: 71.58.48.5  Rating: N/A |
Bill, remember to note total weight. These darn coaches tend to gain weight just like us. You know, extra oil, new gotta have tool, new entrance stool, fancier heavier chairs, etc, etc. I'm not even going to get into what mom keeps adding. Then you can factor in why you now have to drop a gear on that hill even though the engine is running great. | ||
| Bill Gerrie (Bill_gerrie)
Registered Member Username: Bill_gerrie Post Number: 161 Registered: 3-2006 Posted From: 209.50.74.6 Rating: N/A |
John You got that right. I try to go through the entire bus at the end of each season. It is amazing how many things you can't do without but for some reason you never use them. I can't beat Petes times but at least it will give you a base line for your own unit to compare if you expect a problem. Bill | ||
| Pete/RTS Daytona (Pete_rtsdaytona)
Registered Member Username: Pete_rtsdaytona Post Number: 462 Registered: 1-2005 Posted From: 72.189.65.231 Rating: N/A |
additional info First...................................1.77:1 Second...............................1.21:1 Third..................................0.88:1 | ||
| Bob Symonds (Bob_symonds)
Registered Member Username: Bob_symonds Post Number: 38 Registered: 5-2006 Posted From: 64.252.99.82 Rating: N/A |
My 4104 does 0 to 60 in 45 seconds... is this good? |