Just finished a 900 mile trip with my 82 CJ7 limited. I found that the fastest I could go was 64-67 in 5th and the pedal to the floor board. I am used to my Waggy with a 360 and 727 which can creep up to 90+ if I am not watching my speed.
I know the CJ7 isn't exactly the most aerodynamic vehical out there so I don't expect it to be speed racer in 5th and go 120 mph but what I was getting seemed a little low. My question is: Is this normal for a 258 powered CJ7 with T-5 or should I have a mechanic check it out?
1982 CJ7 Limited, 31" Mud Terrains, GM HEI, Ford Taurus Elec. Fan,Stock Gearing?(not 100 percent on that)
whats your gear ratio? is your speedo adjusted for the larger tires? I'm willing to bet your going a little faster than 64-67... I could hit well over 75 in 4th gear on my 258/T5 combo with 3.31 gears on 33" tires.
1985 CJ7 Project Phase One : 5.3L Vortec/4L60E, Moser axles for AMC20, Twin Stick'd Dana300 - Completed Phase Two: Bedliner, Rollcage, Seats, BESRK Rear Bumper w/ tire swing, Soft Top, and a few other goodies - Mostly Complete Phase Three: Waggy 44 front, Scout D44 Rear, 4.56's, ARB's (F/R) SOA with YJ Springs, 35x12.50x15 BFG MT - Not Even Close to beginning
Also a mostly rust-free 1970 Scout 800A That I'll get to start working on someday...
Chrome won't get you home...BUT Rattle Can Black may just get you back"
well over 80 with a 3 speed road.
Can cruise at 70/75
258, Weber 34, CDI Ignition, TeamRush, Aux Grounds, Borla Header & Exhaust, Modern 2 Barrel Intake from 80's AMC, stock cam and heads with rebuilt long block. Runs very well and pulls from 600 to 4400 rpms and have done 66 @ 4000 rpms in second gear of 3 road gears per calculators. 33x12.5, 3.54 axles, T18 granny
I am not sure how fast mine will go... only have 2500 miles or so on rebuild and have not pushed it. I have taken too long drives one to Central Iowa and one to Northern MN. Both Drives were 4 hrs one way. No problems not a hick up. The Northern MN trip included 4 days of wheeling with a bud and modern jeep. After he said "impressed how well a old CJ can work" and I only used 1 more gallong of gas on the way up there than he did. Does drive nice at 75 and can drive with two fingers at that speed, so the PO did something right his dad owned a semi front end place... but that is all I can say for them they messed up many other things.
I know my 1973 new Jeep Truck could do 90-95 pretty well. Still screeming but could do it. Most health jeep CJs should be able to do 85 or 90 for short time. Way off gears would be a big issue.
I just read what FoggyBottom has and that would be hard for most of us to do in the Mtns. I grew up in mountains and may go back to NY Catskills I am affraid my big tires will not cut it in the hills/mtns. I am changing to 3.73 and lockers maybe this spring.... but the hwy mileage is hard to give up. W/o granny gear I would change to 4.11 most likely.
FoggyBottom.... Very few could follow that hill work at 7000 ft range. Pretty impressive. Next one will go with 4.0 head and FI and 258 base.... what kinda of mileage do you get if you "feather it" as they say and not all the hill suff but hwy cruise????? Foggy if you see this let us know??
I can get 22-24 IF i feather and use a vac gauge to watch what I am doing.... in the hills/mtns sure it would tank to 17 or so. So for 32 yrs old I am pretty happy with it.
Last edited by Fjguercio; 01-09-2010 at 03:56 PM..
Just did a 400mile round trip on the way there scared to go over 60mph. Tightend the rear left leaf sping, hit 75 on the way back. Fresh 258, t5, 32s. It still sounds like a brick going down the round.
I can do 80 on level ground but that tapers off to less going up hill on any grade. I probably average about 65 in the mountains on good roads. I have a 258, 4.0 head, HEI dizzy, 33's and 4.30 gearing. And most of my driving is between 5000 and 12,000 feet ASL.
When I had a 258 it would go 90 with the stock carb (33s, 4.56s & T-176, typically between 1,000 and 11,000 feet, I live around 6,000ft)
After injecting it (junk yard multipoint) it would cruise at 90 part throttle (33s, 4.56s & t-176, typically between 1,000 and 11,000 feet). (Best 6 that I have ever had, 4.0s and Buick v-6s don't come close). I got better performance and usage from that 6 than many of the v-8s that I have owned.
...a well prepped, well driven, vehicle should do well in any terrain, including the highway.
Carburetors became obsolete during the last century... do what ever it takes to get fuel injection...It makes bigger grins off road.
Mine will cruise all day at 120 kph or about 70-75 mph.
Here is how mine runs with 91 octane ESSO gas and the timing set at 8-9 BTDC using the stock carb, OEM cap, rotor and wires and an Accel coil with 3.31 gears turning 33's. (while still passing emissions and giving 21 mph highway) Computer disabled.
1st lights up the 33's 'way' too easy off a stop. 2nd hauls fast to 52 mph@4400 rpm. 3rd pulls hard to 75 mph. 4th buries the speedometer and I have 'no' urge to find out how fast 5th will go.... It also will crawl up a sand pit wall or ravine wall at 400 rpm without a chug, get too steep and it just churns the tires in...
86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
Some Canadian Bush Jeep Runs and Build Photos: http://mikeromainjeeptrips.shutterfly.com (10 new albums added Sept 16/10)