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Unread 05-29-2013, 12:28 PM   #1
stargazer3141
Registered User
1991 YJ Wrangler 
 
Join Date: Jan 2010
Location: Tennessee
Posts: 26
62 mm throttle body

Anyone have any advice here? My wrangler is a 91 with the 4.0 and am running a stock throttle body with a spacer and cold air intake. Anyone ever upgrade to a 62 mm throttle body? Good or bad idea? Worth the expense? Any brand/model recommended?

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Unread 05-29-2013, 12:51 PM   #2
jsawduste
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2006 YJ Wrangler 
 
Join Date: Jul 2006
Posts: 2,947
Doable but not truly a bolt on.

Depending on your altitude and exhaust efficiency you may need to run larger injectors as the stock injector duty cycle will likely not flow enough fuel. Bumping the fuel pressure is a given no matter what.

One phenomena with the larger TB will be a pronounced flat spot in the low/mid RPM range. This is the Closed Loop ECM tuning at work and it is tough to totally eliminate.

I`ve finally got mine running what I consider to be pretty good after playing with timing, fuel pressure, injector phasing and throttle plate air bleeds. Even so the plan is to convert to OBD2 over the winter and have the ability to reprogram the ECM.
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Unread 05-29-2013, 07:12 PM   #3
superj
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1987 YJ Wrangler 
 
Join Date: Mar 2008
Location: corpus christi, texas
Posts: 6,321
i went to one on a cherokee i had. it was a renix fuel injection system though so it was a little different. the oversize throttle body made such a huge difference that i ended up not regearing after going to larger tires
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Unread 05-30-2013, 10:19 AM   #4
Siva283
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1995 YJ Wrangler 
 
Join Date: May 2011
Location: Falling Waters, WV
Posts: 3,697
Quote:
Originally Posted by jsawduste View Post
Doable but not truly a bolt on.

Depending on your altitude and exhaust efficiency you may need to run larger injectors as the stock injector duty cycle will likely not flow enough fuel. Bumping the fuel pressure is a given no matter what.

One phenomena with the larger TB will be a pronounced flat spot in the low/mid RPM range. This is the Closed Loop ECM tuning at work and it is tough to totally eliminate.

I`ve finally got mine running what I consider to be pretty good after playing with timing, fuel pressure, injector phasing and throttle plate air bleeds. Even so the plan is to convert to OBD2 over the winter and have the ability to reprogram the ECM.
Hope your gonna do a write up on the OBDII switch.

The throttle body spacer doesnt really help fuel injection.
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