Jeep Strokers

Welcome to the board.
Are you located in Abu Dhabi? I'm 160km away in Al Ain.
I don't understand what you mean with

The modulator been enhance with 140 a (Grand Cherokee’s modulator)

Did you have the intake manifold opening enlarged to match the 68mm throttle body bore?
Which intake manifold are you using?
Are you using a K&N filter inside the stock airbox?
Can you tell us what parts went into your 4.6 stroker?

Some more details about your engine would be very helpful.

Never heard an alternator referred to as a modulator. You might be able to find additional power if you get it tuned correctly(not sure about 50hp, but Don saw a great gain in power from Hesco tuning the Unichip piggyback). Other than a proper tune, you'd get gains like that and more from forced induction(supercharger or turbo), but that all depends on how high your compression is from how you built your stroker. Ideally you would have built the engine with forged components and low compression if you were planning to super/turbo-charge it.

Also what are your tire size and axle gear ratios?

Golen's stroker engines are pretty good so you should have plenty of power, but I suspect that the bigger tires are not allowing enough of that power to reach the ground. If your stock axle gears are 3.07's, you can swap in the 3.55's from an automatic XJ. Shouldn't be hard to find at the scrapyards in Sharjah.

Cheromaniac wrote:Golen's stroker engines are pretty good so you should have plenty of power, but I suspect that the bigger tires are not allowing enough of that power to reach the ground. If your stock axle gears are 3.07's, you can swap in the 3.55's from an automatic XJ. Shouldn't be hard to find at the scrapyards in Sharjah.

Thanks but this will kill my speed in desert!

I'm assuming the wheels you have the 285/75s on are 16", thus almost a 33" tire. In the Jeep world, the gears you'd be running would be 4.10s(some even go 4.56). I seriously doubt that you come anywhere near topping out 5th in the desert. Heck, my 4.6 on a straight stretch of highway could barely hit 140 and that is on 27" tires and 3.55 gears. Maybe you're hitting the 114mph limiter? Did you change out your speedo gear when you put that wheel/tire combo on? If I drove your Jeep, it'd feel like I was starting in 3rd gear. Anyhow, you'll love the power of your stroker if you are geared properly.

gradon wrote:I'm assuming the wheels you have the 285/75s on are 16", thus almost a 33" tire. In the Jeep world, the gears you'd be running would be 4.10s(some even go 4.56). I seriously doubt that you come anywhere near topping out 5th in the desert. Heck, my 4.6 on a straight stretch of highway could barely hit 140 and that is on 27" tires and 3.55 gears. Maybe you're hitting the 114mph limiter? Did you change out your speedo gear when you put that wheel/tire combo on? If I drove your Jeep, it'd feel like I was starting in 3rd gear. Anyhow, you'll love the power of your stroker if you are geared properly.

Thanks Goradon, lets clarify two things,

1) I am using this car mainly 70% for Desert and 30% for Road (as much as I can I would love to maintain the road speed but always I should watch the impact in my Desert performance)
2) For the last 7 months I changed my tire size 3 times till I reach to this one (Michelin LTX) where it is big, light and quality.

To be honest, I do not have any clue about Jeep Gear ratio and how to adjust that. Do you mean to change my Gear or other part of my car!? Appreciate your elaboration! In the clip I past here-above all the cares are modified with Turbo, Supercharge and Stroker!

Manual transmission Jeeps mostly came with 3.07 gears in the axles(not the ratios in the transmission) and ~28" tires; automatics generally came with 3.55 gears. As you increase your tire size, you decrease the effective axle ratio. Most offroad Jeepers will regear both of the axles with 4.10 gears for 32-33" tires, and 4.56 gears for 35" tires. You will have better acceleration(due to torque multiplication), gas mileage, and more control offroad in lower gears if your axles had 4.10 gears. As you sit now, your engine is putting more effort to get you moving from a stop, and as I said before, your 1st gear is now effectively a 2nd-3rd gear with those 33" tires and 3.07 axle ratio. You will love the 4.10s or 4.56s(especially if you ever plan to go to a larger tire).