turbo 4.0 to turbo 4.6
Posted: March 10th, 2011, 5:56 pm
first i want to say hello to all. i have been a member of the site for about a year now. my name is Chris, i live in Whitehall (central) Ohio. Ive had jeeps since i was 16 (25 now). started out with a 90 Cherokee with the wonderful renix system. always loved turbo so i decided to turbo it about 4 years ago. the engine was a stock 4.0 out of a 98 wrangler with 60k on the ticker. was running it on 5 psi with only 24lb injector from a 360 v8 and a vortech fmu. all motor it put down a lousy 140hp and 230tq through the worn out aw4 with 220k. with 5 psi it put down 215 hp and 285 tq and went 15.4 at 86mph. not to bad i guess. so i drove it for about 3 years this way with no issues what so ever, did i mention i was running stock fuel pump and was able to keep air-fuels in the low 12's under boost.
To get on with it, the Cherokee rusted out and ended up going to bone-yard, engine to another jeep and so on. then tax money came. got me an 89
Comanche which started as a 4cyl 2wd and was swapped to a 6 cyl 5sp 4wd. put floorboards in it finished up a few things, so the process starts. first thing was a
centerforce dual friction clutch. for the turbo kit i took the factor header and cut the bottom two pipes off and turned them around, merged it into a 2.5 in collector right under the left motor mount. made the up pipe to come up just at the left front corner of the intake. the 38mm wastegate was welded at the bend
where the up goes up to the turbo. the turbo it a 60-1 t4. .96 hot side and .60 on the compressor. after that there is the 3 inch downpipe that crosses under the bellhousing, changes to 4 inch and heads out the right bedside just infront of the rear tire. took it to the track, went 14.90 at 92mph. tons better.
so then my buddy informs me that he is junking his j10 pick up with the 4.2 in it. it only had 60k on it. he gave me the engine for hauling it to the junk yard.
so it was time to stroke it. using a good 99 block my friend matt was taking performance engine machining at northwestern and did all the machine work for me for free as a class project. here is the work he did.
the block:
the head:
To get on with it, the Cherokee rusted out and ended up going to bone-yard, engine to another jeep and so on. then tax money came. got me an 89
Comanche which started as a 4cyl 2wd and was swapped to a 6 cyl 5sp 4wd. put floorboards in it finished up a few things, so the process starts. first thing was a
centerforce dual friction clutch. for the turbo kit i took the factor header and cut the bottom two pipes off and turned them around, merged it into a 2.5 in collector right under the left motor mount. made the up pipe to come up just at the left front corner of the intake. the 38mm wastegate was welded at the bend
where the up goes up to the turbo. the turbo it a 60-1 t4. .96 hot side and .60 on the compressor. after that there is the 3 inch downpipe that crosses under the bellhousing, changes to 4 inch and heads out the right bedside just infront of the rear tire. took it to the track, went 14.90 at 92mph. tons better.
so then my buddy informs me that he is junking his j10 pick up with the 4.2 in it. it only had 60k on it. he gave me the engine for hauling it to the junk yard.
so it was time to stroke it. using a good 99 block my friend matt was taking performance engine machining at northwestern and did all the machine work for me for free as a class project. here is the work he did.
the block:
the head: