Bored throttle bodies

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Jun 6, 2013 | 06:59 AM

#16

Creature85

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Joined: Jun 2013

Posts: 197

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From: Canastota, New York

Year: 2015

Model: Cherokee (KL)

Engine: 3.2l

Quote:

Originally Posted by evan00xj

You need to research strokers. Understand throwing a bigger bore tb on there is changing your air to fuel ratio. Im running a 62mm TB with 24# injectors but i have the bigger cam, ported head, 4.2 crank, 4.2 rods, bored block etc... you get a 62mm on a stock 4.0 motor you dont have the additional fuel to make up for increased airflow.

I know a bit about strokers, and I do know the basics behind what bored TB's do i.e. the bigger the bore the more airflow. I'm doing a 784 injector swap probably this weekend if that matters, which I'm guessing not. I figured that the ECU would regulate the fuel to air ratio like it would normally do. Would that assumption be wrong?

Quote:

Originally Posted by cleenrob

i just picked up a 60mm TB from thexjfiles here on the forum. he bores thme below the butterfly so that is 60mm all the way thru. its only 55 bucks before a 25$ core charge. i feel like 62mm is a bit much for my current needs -too much air to not enough fuel is a great recipe for burnt valves

Right right, I see what you're saying. Honest question but is that 2mm really noticable? All I'm really trying to do with my Jeep is give a bit more "umph" and help overall preformance, not trying to build a race car or anything lol.

Jun 6, 2013 | 07:06 AM

#17

OttawaXJ

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Joined: Nov 2010

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From: Ottawa, on

You have far too much faith in the Jeep standard equipment. lol

And yes the 2mm is noticable. think about how much VOLUME can fit in there that couldnt before. and CFM. Dont think about it in diameter measurements.

Jun 6, 2013 | 07:08 AM

#18

cruiser54

::CF Moderator::

Joined: Aug 2011

Posts: 43,971

Likes: 1,578

From: Prescott, Az

Year: 1990

Model: Cherokee (XJ)

Engine: 4.0

There's plenty of "headroom" in the stock injectors and injection system to handle the air flow of a bored tB. Compensates very well. You guys are way overthinking this.

2mm does make a difference. Go for it.

Last edited by cruiser54; Jun 6, 2013 at 07:17 AM.

Jun 6, 2013 | 11:29 AM

#19

Creature85

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Joined: Jun 2013

Posts: 197

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From: Canastota, New York

Year: 2015

Model: Cherokee (KL)

Engine: 3.2l

Quote:

Originally Posted by OttawaXJ

Fair enough lol.

Quote:

Originally Posted by cruiser54

Gotcha. I think I'm sold on getting the 62mm J&C TB.

Thank you to everyone that commented, you guys have been a lot of help!

Jun 6, 2013 | 12:14 PM

#20

stang65

CF Veteran

Joined: Aug 2012

Posts: 1,592

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From: oregon

Year: 1993

Model: Cherokee

Engine: 4.0 ho 99 intake ps pump 1" tb spacer 62mm bored tb eletric fans and more

running the bigger TB on my jeep with all the other mods has made the most differance of them all. granted i dont have a cam. if you trully think that you arent geting the right fuel you can bump the presure up to 3 bar instead of 2.8