TFI upgrade question
BrockGrimes
Jeep-CJ.com Archive Master
Mine actually got a little better. Plus I retuned the carb and started running syth. 2cycle oil in the gas.
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TFI upgrade question
- Thread starter CJ777
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CJ777
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- 1977 CJ7, 2001 silverado, 2005 A4,41 F100,77 F350
I just switched my carb. from the stock single barrel carter to the M2100 2 barrel and love it, except the mpg still is only about 10ish. Hoping this upgrade might improve it a little more.
IOPort51
NOT the voice of reason Jeep-CJ.com
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4.2 W/MC2100 carb, 4.0 head W/3 angle valves,SS Header,TFI ignition with MSB-6 offroad module,CS144 140 amp RPS alternator with remote regulator T-150,d-20,Dana 44 with OX lock and disk brakes. D-30 with Spartin locker,
skyjacker 2.5 lift?nitro shocks,31" BFG A/T off road.8000 lb Warn winch, original owner.=^)
2006 Toyota Tacoma
I am going to suggest you start thinking about a cam and lifters, the one barrel carter AMC 258 i6 / 4.2l had a rather underwelming cam even compared to the two barrel AMC 258 i6 / 4.2l . The 2 barrel is a major leap forward but you will never get all the good out of it with out a cam upgrade. I'm not going to say you will get better milage but I wouldn't think it would be any worse and a bit more fun to drive.
dalefan88
Crazy Sr. Respected Jeeper
I would think that fix should come before any more upgrades!
ill get to it sooner or later. to much fun doing other stuff to it lol. i just make sure after i drive it for awhile i put gas back in it. it is our toy so it only gets out some nights after work and some weekends. so for in two years ive never ran out of gas.
CJ777
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- 1977 CJ7, 2001 silverado, 2005 A4,41 F100,77 F350
I am going to suggest you start thinking about a cam and lifters, the one barrel carter AMC 258 i6 / 4.2l had a rather underwelming cam even compared to the two barrel AMC 258 i6 / 4.2l . The 2 barrel is a major leap forward but you will never get all the good out of it with out a cam upgrade. I'm not going to say you will get better milage but I wouldn't think it would be any worse and a bit more fun to drive.
I'll have to look into that one, but it will have to be a ways down on the list. Do you know of anyone that has done this and what would i be looking at as far as money?
IOPort51
NOT the voice of reason Jeep-CJ.com
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- 1977 cj-5
4.2 W/MC2100 carb, 4.0 head W/3 angle valves,SS Header,TFI ignition with MSB-6 offroad module,CS144 140 amp RPS alternator with remote regulator T-150,d-20,Dana 44 with OX lock and disk brakes. D-30 with Spartin locker,
skyjacker 2.5 lift?nitro shocks,31" BFG A/T off road.8000 lb Warn winch, original owner.=^)
2006 Toyota Tacoma
A couple hundred I would guess but don't sweat it your fine with out it. Just think of it as one more little tweek you can make when you decide it is time.
CJ777
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Thanks IO, there is soooo much to learn.
Cheepjeep85
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COMP Cams CL68-232-4 - COMP Cams Xtreme Energy 4x4 Cam and Lifter Kits - Overview - SummitRacing.com
this is what i wished i would have done to mine while i was rebuilding but sadly i didn't have the extra cash to spend. oh well its going to get this cam when i do the 4.0 head swap. what sucks is you have to tear the motor down to bare block, minus the rotating assembly, just to change out a cam.
this is what i wished i would have done to mine while i was rebuilding but sadly i didn't have the extra cash to spend. oh well its going to get this cam when i do the 4.0 head swap. what sucks is you have to tear the motor down to bare block, minus the rotating assembly, just to change out a cam.
CJ777
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IOPort51
NOT the voice of reason Jeep-CJ.com
- Posts
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- 11
- Location
- Garland Texas
- Vehicle(s)
- 1977 cj-5
4.2 W/MC2100 carb, 4.0 head W/3 angle valves,SS Header,TFI ignition with MSB-6 offroad module,CS144 140 amp RPS alternator with remote regulator T-150,d-20,Dana 44 with OX lock and disk brakes. D-30 with Spartin locker,
skyjacker 2.5 lift?nitro shocks,31" BFG A/T off road.8000 lb Warn winch, original owner.=^)
2006 Toyota Tacoma
That looks like a pretty good choice. I wish I knew the specs on the cam that is in it now(stock 1 bbl). I could be buying the same thing I already have and never know it.
Sasquach
Crazy Sr. Respected Jeeper
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1964 CJ3B, 4-134
1952 M100 trailer
From my 78 service specs. book:
cam lobe lift
AMC 232 i6 /25 1V 0.AMC 232 i6 "
AMC 258 i6 / 4.2l w/ 2V 0.248"
cam lobe lift
AMC 232 i6 /25 1V 0.AMC 232 i6 "
AMC 258 i6 / 4.2l w/ 2V 0.248"
Sasquach
Crazy Sr. Respected Jeeper
- Posts
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- Santa Ynez, Ca.
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- 1978 CJ5, 258 w/4.0head, Mopar MPI, P.S., P.B.,Tilt wheel, No stereo, t-18, t-20, amc 20, dana-30 w/tru-trac, Warn full float w/locking hubs & Detroit locker in the AMC.
1964 CJ3B, 4-134
1952 M100 trailer
Did the TFI upgrade on my ignition yesterday. Jeep runs much crisper with better throttle response, My Ca. AMC 258 i6 / 4.2l 1V had horrible hesitation off idle and made leaving a stop sign a question of will it fall on it's face or will I make it to 2nd gear? I did the ghetto version and replaced cap base/cap/rotor/wires/non E coil and regapped the existing plugs to .0045 and reset the timming( was off 4 degrees even though I did not move the distributor). The Original equipment cap/rotor/wires that I replaced were nearly new so It wasn't a matter of the old stuff being worn out.
Good bang for the buck here and pretty much a no brainer.
Good bang for the buck here and pretty much a no brainer.
dalefan88
Crazy Sr. Respected Jeeper
one of the (in my mind) best cheapest thing to do to your jeep.