62mm Throttle Body - Page 2 - JeepForum.com
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post #16 of 26 Old 04-20-2017, 10:39 AM
RedJeepster1
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Running a new quadratec head, banks torque tubes and 784 injectors on my 01 Cherokee would you guys recommend a larger TB and realistically what kind of improvement would I get?

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New quadratec head?


88 YJ with a 4.6l stroker, AX-15, NP231, 2.5" lift, 4.10's and 33's
2000 Silver XJ, 4.0, AW4 with 350k+, Locked C8.25 w/ Chromos, Trussed hp30, 4.56's, Stiffened, IRO leafs, RE coils, custom 3 link, WJ knuckles, 35's
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post #17 of 26 Old 04-20-2017, 11:05 AM
delesandwich
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New quadratec head?
Sorry, the Promaxx head from quadratech


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post #18 of 26 Old 04-20-2017, 11:16 AM
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Which I assume is just a new casting of a factory head? If you have a better flowing exhaust, and bigger throttle body, and higher output injectors, you should in theory be able to flow more and and fuel through the engine and gain some HP. There's never any guarantee of that though. I certainly wouldn't expect any fuel economy increases. Whats your goal with the bigger throttle body? Just more power? Is the Jeep otherwise stock?

88 YJ with a 4.6l stroker, AX-15, NP231, 2.5" lift, 4.10's and 33's
2000 Silver XJ, 4.0, AW4 with 350k+, Locked C8.25 w/ Chromos, Trussed hp30, 4.56's, Stiffened, IRO leafs, RE coils, custom 3 link, WJ knuckles, 35's
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post #19 of 26 Old 04-20-2017, 11:23 AM
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Which I assume is just a new casting of a factory head? If you have a better flowing exhaust, and bigger throttle body, and higher output injectors, you should in theory be able to flow more and and fuel through the engine and gain some HP. There's never any guarantee of that though. I certainly wouldn't expect any fuel economy increases. Whats your goal with the bigger throttle body? Just more power? Is the Jeep otherwise stock?
Promaxx claims a heavier than stock casting and hardened valve seats. I originally had the 0331 boat anchor that cracked on me. Now I'm trying to squeeze as much power out of it while still keeping it reliable. It's about to make a trip from South Texas to Alaska

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post #20 of 26 Old 04-20-2017, 11:35 AM
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Promaxx claims a heavier than stock casting and hardened valve seats. I originally had the 0331 boat anchor that cracked on me. Now I'm trying to squeeze as much power out of it while still keeping it reliable. It's about to make a trip from South Texas to Alaska

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Have you regeared for those tires? That will make a big difference in how the Jeep drives. Btw, love the wheels. I have a set myself although I'm not currently running them.

88 YJ with a 4.6l stroker, AX-15, NP231, 2.5" lift, 4.10's and 33's
2000 Silver XJ, 4.0, AW4 with 350k+, Locked C8.25 w/ Chromos, Trussed hp30, 4.56's, Stiffened, IRO leafs, RE coils, custom 3 link, WJ knuckles, 35's
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post #21 of 26 Old 04-20-2017, 11:37 AM
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Have you regeared for those tires? That will make a big difference in how the Jeep drives. Btw, love the wheels. I have a set myself although I'm not currently running them.
Gears and lockers are on the list for sure, don't really have the time to install them right now though

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post #22 of 26 Old 04-20-2017, 11:49 AM
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Gears and lockers are on the list for sure, don't really have the time to install them right now though
I think that would be your biggest gain. Most of the bolt on's don't do a whole lot for the 4.0. At last in my experience.

88 YJ with a 4.6l stroker, AX-15, NP231, 2.5" lift, 4.10's and 33's
2000 Silver XJ, 4.0, AW4 with 350k+, Locked C8.25 w/ Chromos, Trussed hp30, 4.56's, Stiffened, IRO leafs, RE coils, custom 3 link, WJ knuckles, 35's
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post #23 of 26 Old 04-20-2017, 12:00 PM
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I think that would be your biggest gain. Most of the bolt on's don't do a whole lot for the 4.0. At last in my experience.
Been kind of holding out hoping to find a set of rubicon 44's

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post #24 of 26 Old 04-21-2017, 11:53 AM
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Originally Posted by RedJeepster1 View Post

I think that would be your biggest gain. Most of the bolt on's don't do a whole lot for the 4.0. At last in my experience.
I'm with red on this one. Proper gearing will do a lot more for the butt dyno than the throttle body, though it should help some in theory. A lot of people claim big noticeable improvements but personally I think it's usually an illusion caused by the bigger TB being more open at a given pedal position.

Also...do you mean TJ 44's? It's worth noting they get the 44 diff, but the outers are identical to a d30. Most people break shafts or u-joints anyway so that upgrade may do nothing but cost you under diff ground clearance.

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post #25 of 26 Old 04-22-2017, 09:33 AM
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I'm with red on this one. Proper gearing will do a lot more for the butt dyno than the throttle body, though it should help some in theory. A lot of people claim big noticeable improvements but personally I think it's usually an illusion caused by the bigger TB being more open at a given pedal position.

Also...do you mean TJ 44's? It's worth noting they get the 44 diff, but the outers are identical to a d30. Most people break shafts or u-joints anyway so that upgrade may do nothing but cost you under diff ground clearance.
Didn't really consider the outers were D30 on the tj 44's. The appeal of the turn key 44's with lockers and 4.10's got to me. I have no plans to go with bigger tires and still want decent highway drivability.

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post #26 of 26 Old 04-22-2017, 09:54 AM
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Didn't really consider the outers were D30 on the tj 44's. The appeal of the turn key 44's with lockers and 4.10's got to me. I have no plans to go with bigger tires and still want decent highway drivability.

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If it works for you, it works for you. Just wanted to make sure you knew what you were getting.

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