62 mm throttle body - JeepForum.com

 
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post #1 of 4 Old 05-29-2013, 12:28 PM Thread Starter
stargazer3141
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1991 YJ Wrangler 
 
Join Date: Jan 2010
Location: Tennessee
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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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post #2 of 4 Old 05-29-2013, 12:51 PM
jsawduste
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2006 YJ Wrangler 
 
Join Date: Jul 2006
Posts: 3,604
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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post #3 of 4 Old 05-29-2013, 07:12 PM
superj
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1987 YJ Wrangler 
 
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Location: corpus christi
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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

I don't feel like working on anything, at this time.
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post #4 of 4 Old 05-30-2013, 10:19 AM
Siva283
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1995 YJ Wrangler 
 
Join Date: May 2011
Location: Falling Waters
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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.

1995 YJ. 2 inch BDS Spring lift. 1 inch shackle lift. 1.25 inch JKS Body Lift 33x12.5x15's. Engo 10,000 pound winch.

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diagnose the real issue before you start going all Obama on it - spending mad cash you'll need for other important things.

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this is also my second set of RC springs this year. I'd rather spend the money again and get something that will last.
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