Anyone do an ignition mod/upgrade? What's your thoughts?

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Nov 12, 2022 | 03:11 PM

#16

aoneil924

Newbie

Joined: Aug 2022

Posts: 14

Likes: 0

From: New Jersey

Year: 1998

Model: Cherokee (XJ)

Engine: 4.7 Stroker

Quote:

Originally Posted by drhoward1988

These 4.0s dot respond well to simple bolt on mods. To gain any significant power you must either add forced induction or change engine internals such as a turbo or built stroker motor.

I just installed my 4.7 stroker and once in a blue moon the rpms would go down once I hit the gas. It's still running the stock ignition and I'm wondering if that's what could be causing the drop in rpm.

Nov 12, 2022 | 04:44 PM

#17

cruiser54

::CF Moderator::

Joined: Aug 2011

Posts: 43,971

Likes: 1,579

From: Prescott, Az

Year: 1990

Model: Cherokee (XJ)

Engine: 4.0

No. The biggest demand on the ignition is under load and higher RPMs.
What year xJ?

Nov 12, 2022 | 05:21 PM

#18

97grand4.0

CF Veteran

Joined: Nov 2015

Posts: 2,863

Likes: 201

From: syracuse ny

Year: 1997 230,000 miles

Model: Grand Cherokee (ZJ)

Engine: 4.0, new lifters valve job with new springs and exhaust valves, preload set with shims

I did the Accel coil years ago and it's been fine, I forget it's there. I also added shims to the distributor to limit end play. This can be dicey and is a matter of personal choice. I would also suggest by way of easy mods, moving the IAT sensor from the manifold to the intake horn, ..That one I saw real improvements.

Nov 13, 2022 | 05:02 AM

#19

89eliminator

aka Wade-O

Joined: Dec 2008

Posts: 3,703

Likes: 10

From: IN

Year: 1989 Comanche

Model: Cherokee

Engine: 4.0

i run an MSD street fire box and summit racing coil on my Renix. maybe its placebo but I noticed better throttle response immediately. also having a tunable rev limiter is nice.