4.3L XJ

As I said, you can go to spring under the axle and lower 5.5" that way. But you cannot achieve that in the front without being on the bump stop. So you stiffen the spring a little and then do the spring under switch.

TurboPirate

You are right my friend, now I have faced another bump on the road, in order to be a fair race my friend telling me have to use stock ecu since he is using stock ecu of the Chevy engine, I pointed out the Blazer is factory turbo and the ecu is for that application, the Cherokee is not turbocharged and the factory ecu is for Naturally Aspirated application. Do you know if there is a re flash for the factory ecu with the turbocharged info? Factory ecu will go bananas once the MAP sensor reads boost.........I was going to use megasquirt.......TP

4.3L XJ

Best place to start checking is Summit Racing Tech. They offer reflashing Chevy ECUs as a service. Not cheap though. If that doesn't pan out, I think I know of someone else to ask on a Chevy forum

TurboPirate

My ecu is factory Cherokee, the flash is for the Jeep's Factory ECU. My friend is the one with the Chevy ecu, motor and tranny, I want to keep my Jeep all Jeep with the exception of the Turbo and maybe the rear differential.
Thanks

TrailerTrash

It is far from that simple. You can't just get any old stock ECU reflashed for any old turbo setup

andrewmp6

Spring under will axle wrap hard with out traction bars and or a torque arm on it.If he wants a drag xj its best to just back half it with a 4 link narrow rear end and some meaty slicks.But his dream of a 4.0 making big power will be a nightmare if it happens at all.I can rebuild a carbed junkyard 350 with a bigger cam and vortec heads and make more power then a turbo 4.0 and cheaper then the turbo itself cost.

andrewmp6

You could get a tuner that will change very few things or run a piggy back system,But the cost of them is not worth the little bit of power it can make.And unless you rebuild that 4.0 to handle boost like bigger piston ring gaps and cam and head work,Its not gonna make a lot of power.If you try to run a lot of boost on a stock engine the piston rings will fail if not the head gasket first.The other thing is retarding the timing vs psi and getting fuel to it.

Waynerd

Slightly off topic but I came across the worlds fastest Cherokee up for sale on EBay. It's the white first gen that a lot of you may have seen video of or read about it in some popular auto mags. Wish I could just buy that. Lol.

CobraMarty

I had a Syclone back in the day. Bought new for $19k.
With 'bolt-ons' ran 13.1
With built motor 11.9 and 0-60 4 sec wet or dry. Would lift the drivers front tire up an inch on launch.

Check out-all your questions will be answered.
https://www.cherokeeforum.com/f46/pr...cejeep-173699/

CobraMarty

Link?

TurboPirate

Hello gang, I found a turbo from an old Pontiac Firebird V8 301, it is an aspirated turbo design but I am sure it will work boosting into the throttle body, I am leaving the suspension as is no lowering at all, I will be installing an in-line walbro fuel pump as secondary, it will be activated at 5 psi of boost, now I am searching for a shift kit I believe its called, for firm shifts, I was told its a set of springs that have the pressure of the transmission fluids, any recommendations on this shift kit? Also was told the kit is installed without removing the tranny........thanks in advance TP TransGl 340-HD2 was the first someone locally said he used and liked......

Waynerd

4.3L XJ

I have messed with those turbos. Probably Air Research turbo, right. Thing about those is that they had intake seal problems. I made it work on a 225 V6, but I put up a hell of a smoke screen though

TrailerTrash

You are going to run an inline fuel pump between the stock fuel pump and engine? One that will be depending on fuel from the stock fuel pump?

TurboPirate

Yes an inline fuel pump just like Volvos and other European cars, 1 in tank and 1 in line, this method what is doing is delivering gallons per hour not psi. In a turbo setup it is good to have no less than 45 gallons per hour in a 6 psi boost..............I recall the aspirated turbo having issues with the seal, I think it was solved with a carbon something seal so it can resist gasoline..........I found information about how to avoid boost at the MAP sensor, Split Second was the name mentioned but if that is what I think it is I am better of with Megasquirt or Speeduino, I have to remember where I have a crank pulley mod with 36-1 trigger wheel.........thanks for your time and information..............TP