sparky

What is the biggest can I can put in my 4.0 that is on obd2 that won't make it go haywire

dukie564

are you doing any other engine mods? A cam by itself is going to not do much...

to make a new cam an effective purchase you need to stroke the block, and have a free flowing head and exhaust

sparky

I have ported head and a header and I'm stroking it now but running my stock ecu and the came I see say you can't use a computer what can would you recommend for this cause my jeep is obd2

dukie564

check out www.jeepstrokers.com - more info than you could ever want

but here's a link i have saved that will help?
http://jeep4.0performance.4mg.com/stroker.html
http://jeep4.0performance.4mg.com/electronic.html

Donnie_K

Really? You need to stroke the engine to notice a difference? no... I have a cam in mine and noticed a big difference, and my engine is not stroked. However I do have a freer flowing exhaust (header, high flow cat, flowmaster deltaflow 40 series) and a 99 intake, with the neon 703 injectors.

dukie564

i didn't say he wouldn't notice a difference - I said unless he made other modifications, the difference would be minor, and the cost to benefit ratio would not make the purchase worth the rewards.

Jeepin'_Aint_EZ

When someone asks questions about cams like the OP asked, i would discourage them from doing it. You need a little more than basic engine knowledge to work with cams. He also mentions increasing the stroke but can't form a complete sentence... Im not bashing but you'll be in over your head before you know it. You need to know exactly how you want your engine to perform, not simply install the biggest cam you could get your hands on. thats a rediculous question. Bigger isnt always better. you could kill the performance of the engine with the wrong cam selection. do some homework bud.

To make a cam most effective you should never run stock intake or exhaust. The point of the cam is to get more air in and out. In the end you're increasing volumetric effeciency. A stroker kit is unnecessary. Sure, you're increasing the amount of air you could pull into a cylinder, but its not needed for most cam applications. Head work would be you're best bet but also, unecessary, unless going with some radical cam which would also require other work. Simply port matching the intake and exhaust would be perfect.

sparky

look jeepin aint ez i been building engines for years ok i always use carburated intakes for my preformance motors not fuel injection so dont talk crap on a forum

Jeepin'_Aint_EZ

I'm sure you have been... all my engine builder buddys go on forums for simple cam information.....

xj_maniac_newb

Yeah he was definitely asking a question about the largest cam he can use without screwing with the ecu, pretty sure thats not something you can just "know" without prior experience working with these 4.0's before. It's not your jeep, not your problem.

fishtaconc

X2^^ great deal of info on jeepstrokers.com

I had real good results with the OEM 97+ dual pattern cam in my stroker, right up to when it died. Just my $.02

hankthetank

why you gotta be like that? you're THAT guy aren't you?