| Author | Message | ||
| Mike Fulper (Seeburgrepair)
Registered Member Username: Seeburgrepair Post Number: 7 Registered: 3-2007 Posted From: 75.117.236.6 Rating: N/A |
Anyone know what a 1990 30 foot transit with 6V92 and 730 allison would do at 2100rpm ?? im guessing 65 mph ? | ||
| George M. Todd (George_mc6)
Registered Member Username: George_mc6 Post Number: 126 Registered: 8-2006 Posted From: 207.231.80.150 Rating: N/A |
Mike, Top speed is totally dependent upon tire size and differential ratio. I don't have a ratio chart instantly available, but several other posters have, if you do a search. We also don't know what the top speed is set at on the engine. So, BLOCK IT AT THE JACKING POINTS WITH QUALITY BLOCKING MATERIALS, go under and read the tag on the diff, read the tire size, and the tables will tell you. George | ||
| Pete/RTS Daytona (Pete_rtsdaytona)
Registered Member Username: Pete_rtsdaytona Post Number: 331 Registered: 1-2005 Posted From: 72.40.12.242 Rating: N/A |
with standard 22.5 tire and 2150- to 2200 RPM these are APPROX MPH 4.10 - approx 74-77 MPH 4.55 - approx 70-73 MPH 5.13 - approx 60-63 MPH 5.38 - approx 58-60 MPH put a chalk mark on the tire - have someone pull the bus foward in parking lot and with a flash light look into the raised passenger side tranny cover and count the number of times the differential "U" joint turns per revolution of the tire - you may have to go 2 or 3 revolutions to get an accurate ratio Pete RTS/Daytona P.S. I have used 4.55's for $500 (whole pumpkins) and new 4.10 (ring and pinion only) for just over $2000 | ||
| Mike Fulper (Seeburgrepair)
Registered Member Username: Seeburgrepair Post Number: 8 Registered: 3-2007 Posted From: 75.117.236.6 Rating: N/A |
Ok, thanks guys... it is a 1990 Flxible 30 footer.. and i couldnt find any differential ratio listed.. So at least i can get another differential and have it cruise at 60-65...anyway.. I want to use it for short hauls carrying Jukeboxes.. These new transits have front doors wide enough and low enough to put a jukebox up inside... I just would like to get the mpg up to 10 if i can.. i can live with that.. but 6 kinda hurts.  I guess the electric touch button V730 should hold up for awhile.. I see people put the V730's in 4106 and 07's... So a lite weight 30 footer should be no problem.. thanks for the info and Pete in Daytona for having ratio's available.. This flexible is an easy jack up unit with the frame.. | ||
| David Hartley (Drdave)
Registered Member Username: Drdave Post Number: 757 Registered: 5-2005 Posted From: 72.189.203.211 Rating: N/A |
Still only gonna get about 6mpg. The FLX I had with a 4:56 rear gear topped against the governor at 72mph @ 2,150 rpm. It's also probably set up for Federal Coach @ 277 hp so max rpm may be limited. If it's a DDEC (electronic) it could be reprogrammed but probably expensive. | ||
| Pete/RTS Daytona (Pete_rtsdaytona)
Registered Member Username: Pete_rtsdaytona Post Number: 332 Registered: 1-2005 Posted From: 72.40.12.242 Rating: N/A |
Mike "...electric touch button V730 ..." if it's a push button shifter box - it's a V731 Pete RTS/Daytona when my RTS was a 5.13 - I got up to 7 MPG on I-10 coming home from Ca. to Fl. - flat out 62 MPG you increase fuel efficiency approx 1.2% for every 100 rpms less than 2100 down to about 1500 rpms SOOOO - With my new 4.10's - If I drive 65 MPH at 1750 RPM - I could get 9 MPG ?? (25% gear change and 5% efficiency change) Pete RTS/daytona | ||
| john w. roan (Chessie4905)
Registered Member Username: Chessie4905 Post Number: 529 Registered: 10-2003 Posted From: 71.58.117.21 Rating: N/A |
Are you positive that it has a 6V-92? That seems awful big for a 30 footer. The 30 foot I dismantled (older), had a V6-71 and about 5:17 or 5:38's. The differential was smaller than the one in my 4905. A lot of transits have the governors set at 18 or 1900. and have small injectors-55's on 71's |