Turbo for 4.0 - JeepForum.com
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post #1 of 17 Old 08-22-2019, 09:00 AM Thread Starter
Byron30
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Turbo for 4.0

I am considering putting a turbo on my 1999 jeep wj. but I don’t know were to start and were to buy one. if someone could let me know what the best kit is or if it’s a good idea to put a turbo on a stock 4.0. Thanks

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post #2 of 17 Old 08-23-2019, 08:26 AM
LuthWJ77
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Search the interwebs there are some out there. I'd personally opt for the 4.6 stroker block going to be about the same price but you'd get your power all through the rpm range rather than having to wait for a turbo to spool up. Either way plan for a trans rebuild also. 42RE works fine in stock mode but I don't think it's built to handle much more than that.
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post #3 of 17 Old 08-23-2019, 08:45 AM Thread Starter
Byron30
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I would consider doing this but will it be as strong and durable as the 4.0?
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post #4 of 17 Old 08-23-2019, 08:50 AM
RedJeepster1
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I know very few people that have been happy with their strokers. Not saying it can't be done, but of the 4 I know of, all of them have spent more time on the stand than in the Jeep.

88 YJ with a 4.6l stroker, AX-15, NP231, 2.5" lift, 4.10's and 33's
2000 Silver XJ, 4.0, AW4 with 350k+, Locked C8.25 w/ Chromos, Trussed hp30, 4.56's, Stiffened, IRO leafs, RE coils, custom 3 link, WJ knuckles, 35's
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post #5 of 17 Old 08-23-2019, 09:02 AM Thread Starter
Byron30
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What about putting a supercharged on it instead of putting a turbo
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post #6 of 17 Old 08-23-2019, 09:20 AM
LuthWJ77
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Quote:
Originally Posted by RedJeepster1 View Post
I know very few people that have been happy with their strokers. Not saying it can't be done, but of the 4 I know of, all of them have spent more time on the stand than in the Jeep.
Oh good to know hadn't looked into it that far. For me and what I use my WJ for the 4.0 is just fine especially in 4L. Plenty of torque off idle can crawl around all day and it never gets hot. If mine crapped out I'd just throw another one in there. It's pretty slow around town though with 32" tires and 3.55 gears but I can live with it.
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post #7 of 17 Old 08-23-2019, 09:24 AM
RedJeepster1
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Quote:
Originally Posted by Byron30 View Post
What about putting a supercharged on it instead of putting a turbo
Slightly more torque off idle, but at the cost of additional stress on the motor, heat, and parasitic losses. The 4.0 makes plenty of torque for offroading, you really only want extra power on the street where your RPM's are likely higher anyway.

When I built my first stroker I was really looking into a supercharger, but knowing what I know now, I'd go turbo before supercharging. I'd also probably swap in a V8 before going with a turbo, but there's a lot of factors to consider and everyone's situation is different.

88 YJ with a 4.6l stroker, AX-15, NP231, 2.5" lift, 4.10's and 33's
2000 Silver XJ, 4.0, AW4 with 350k+, Locked C8.25 w/ Chromos, Trussed hp30, 4.56's, Stiffened, IRO leafs, RE coils, custom 3 link, WJ knuckles, 35's
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post #8 of 17 Old 08-23-2019, 11:37 AM
ChrisHager
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What's your end goal? There's more to it than just slapping on a turbo. You're likely going to need to tune it and depending on how much boost you throw at it, you'll probably need to go standalone. It may be cheaper to buy a 4.7 or something along those lines if you're just looking to leave off-ramps quicker.

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post #9 of 17 Old 08-23-2019, 02:05 PM Thread Starter
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I am just wanting a little more power and I thought that putting a turbo on it would be the easiest and cheapest solution
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post #10 of 17 Old 08-23-2019, 02:24 PM
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You'll also need to add bigger injectors, a high-flow fuel pump, a MAP sensor that can read vacuum and boost, and a custom tune for your engine computer to manage the new engine parameters. You can't just "put a turbo on it". All of that extra air requires that the correct amount of extra fuel be sprayed in while under boost. Otherwise you'll have an engine that runs WAY lean and melts piston tops.
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post #11 of 17 Old 08-23-2019, 02:34 PM
2oldjeeps
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hey i had a 460 mustang just for fun but my jeeps arent for smoking tires!.

i always wonder/ask, if you had 50 more hp, just how would you use it?
normal driving i have never floored a regular car,,,the mustang,oh yeah. them days are gone.

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00xj,177,000 miles
10hummer3,74,000 miles
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post #12 of 17 Old 08-24-2019, 10:31 AM
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Are you running larger than stock tires? If so, a regear would be the first place to start. Even on the stock tires I bet some 4.10's would wake it right up for in town driving but might be to much for extended highway driving
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post #13 of 17 Old 08-25-2019, 09:44 PM
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What V-8 would give a lot more power than the 4.0? The 4.7 V-8? I think not. The 4.0 had equal or better hp than a number of V-8's. Turbo may not be a bad idea or maybe a compression increase with headers, injectors and the like.
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post #14 of 17 Old 08-26-2019, 11:44 AM
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I think just about any V8 from the last 30 years would have more power than the 4.0?... The 4.0 is torquey enough off-road but truly anemic by modern standards. Having driven WJ's with the 4.7 and owning one with the 4.0, the 4.7 is worlds better in pretty much every way (more torque, FAR more HP, also more efficient) aside from not being as tolerant to overheating.

To the OP: If you want more power in a WJ, by far the easiest, cheapest, and most reliable way is to just buy one with a 4.7.
Wheelin98TJ and downs like this.

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post #15 of 17 Old 08-26-2019, 11:45 AM
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Quote:
Originally Posted by runningonempty View Post
What V-8 would give a lot more power than the 4.0? The 4.7 V-8? I think not. The 4.0 had equal or better hp than a number of V-8's. Turbo may not be a bad idea or maybe a compression increase with headers, injectors and the like.
The 4.7 V8 makes more torque at 1,200 RPM than the 4.0 does at it's peak.
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