Carburetor in 1700 Jeepspeed

[tioga00]

Is running 500 or 600 CFM 4 barrel carburetor legal in Jeepspeed?

We have been fighting recurring issues with electrical problems, senors and ECU that are starting to really piss me off. I believe in keeping things simple with a mechanical MSD distributor, Crane 6400 HI-6R and a 4 barrel carburetor. This combination was very reliable on my straight 6 and V8 early Broncos. The 62mm throttle body flows around the same as a 600 CFM carburetor.

Thanks

 

[Loose_Nuts_Enterprises]

You can only run a carb if your XJ came with a carb.....which means you'd have to have the early V6 I believe. However, I don't think there are any motor restrictions with the V6.

-Dan

 

[GSequoia]

However, I don't think there are any motor restrictions with the V6.

-Dan

I hear a very well built $12,000 GM 2.8 V6 can make up to 111 horses. :flame:

 

[tbburg]

...,However, I don't think there are any motor restrictions with the V6.

Well, other then the obvious restriction of running a 2.8 V-6

Seriously, what year/generation FI are you running? Renix/OBD-I/OBD-II? Most of us aren't having reliability problems with the factory FI. 'Might seem like a dumb question, but how it the rest of your electric system?

What specifically are you having problems with?

You can run a carb in the 3700 mopar cup class.( of course, you can also run a V-8 in the 3700 class too,...)

 

[tioga00]

The rest of electrical is spotting. Our plan is to remove entire OEM harness and rewire the minimal sensors needed for the factory FI and possibly move to OBDII.

Issue #1 our 96 XJ starts missing under load when engine get hot (not over heated) eventually leading to no spark at all. After engine sits and cool we limp back to trailer. We have changed cam and crank position senor. We also swapped back to stock coil and replace the ECU.

Issue #2 the starter is not getting enough current to spin the motor even with a new 880 ca battery.

I just wanted to see if going with carburetor would be an option.

Thank you all for your feed back.

 

[Loose_Nuts_Enterprises]

We use the OBDII jeep throttle body and injectors with the Painless Wiring Perfect Hi-Torque engine management system. It replaces all jeep sensors, coil, distributor guts, and computer with GM units. you can actually set the timing, rev limiter, coolant temp to closed loop adjustibility, fuel mapping, amount of timing retard when knock sensor signals, etc. Anything and everything that makes the engine run, you can adjust, and you can take it to most any dyno shop to get it dialed. This is the single biggest power maker in our engine.

-Dan

 

[tbburg]

Not sure about the heat soak problem.
On the starter:
Grounds good?(both chassis and engine)I've seen starters that wouldn't crank several times because of a bad/weak engine ground.
Is the starter itself good? I had one('00) loose one brush that would work about 80% of the time. Acted like an intermittent loose cable/poor contact. 'Didn't help that half the time it would start after wiggling the cables. That was fun to track down.

 

[Loose_Nuts_Enterprises]

The rest of electrical is spotting. Our plan is to remove entire OEM harness and rewire the minimal sensors needed for the factory FI and possibly move to OBDII.

Issue #1 our 96 XJ starts missing under load when engine get hot (not over heated) eventually leading to no spark at all. After engine sits and cool we limp back to trailer. We have changed cam and crank position senor. We also swapped back to stock coil and replace the ECU.

Issue #2 the starter is not getting enough current to spin the motor even with a new 880 ca battery.

I just wanted to see if going with carburetor would be an option.

Thank you all for your feed back.

Need to make sure you main power wire from the battery to the starter is big enough/not corroded or FUBAR'd. Also make sure you have a good ground from battery to chassis, chassis to engine, and Battery to engine. You can't have too many grounds.

-D

 

[tioga00]

We will go through the ground(s) and power.

Dan, I will look into the Painless engine management system as it look like a cleaner solution than rewiring everything ourselves.

Thank you to all for your feedback.