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Thread: 58mm Throttle Body Review

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    Default 58mm Throttle Body Review

    I purchased a 58mm throttle body off of 4U2QUICK a little while back. I got it for $90 (price went up though), but I'm pretty sure he isn't selling them anymore.



    Anyways, here is the stock throttle body bored out to 58mm:



    Here is a comparison between stock and ported. As you can see, the bumps are smoothed out, and it's a good deal larger. Fitment was just fine, since it was stock. The only problem I've had so far with it is the throttle sticking when it is closed. It makes driveability harder (especially with a manual) when it sticks like that, since the throttle will go from closed to pretty open. It's easily adjusted with the screw though, and your car will learn to get the idle back to where it is supposed to be.

    It definitely brings the top end up a good bit. I'd say power over 5,000 rpm or so is increased. Maybe 3 to 5, depending on the RPM? It's hard to say, but the butt dyno liked it.

    This is definitely a good part to complement the rest of the bolt ons. I'm not sure if anybody is actually making them right now (other than Gude), but if you can get it for around $100 or so, it's a good deal.

    Ported and stock closed:






    Ported and stock open.

    Last edited by Beodude123; 06-17-2009 at 07:14 PM.

  2. #2
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    iceracerdude is offline Any idiot can go out there and mash their foot down...it's knowing when to lift!

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    Did you lose anything...like low end torque?

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    Doesn't matter, these aren't made anymore. This fuck head took a bunch of people's money and TB's and booked.
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    yea I didnt lose low end tq, I lost $65 and 4 stock tb's instead
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    I didn't lose anything down low.

    BTW, you can still get them from Gude. They're expensive, but they are available.

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    You could have a machine shop bore out your throttle body and make a plate for it really cheap. A friend of mine did it for me for $15, would have been 10 but he had to purchase the material for the butterfly. I'm going to port and polish it myself, when I get a round tuit

    I wonder what the d-bag did with all those throttle bodies? I almost paid him to do the work, but fortunately decided to be a cheap a$$.

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    If that is the case, why do people charge so much to do them?

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    You can't just make a round plate. I know that wont work since a previous member that use to make parts here did that to my TB and it never ran right. I wasn't the only person that had the issue since we found out later in several other pm's that it was to a couple of people. Matt(Powder) knows about what you have to do to them in order to make them work.

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    Quote Originally Posted by Beodude123 View Post
    If that is the case, why do people charge so much to do them?
    cuz the price 02 5SPD listed is friends price

    real world price is expensive for machine shops. I'm sure powder can chime in what hr rates normally range at but I know they are pretty high.


    Ex. I'll do paint work for pretty much materials and a case of beer for friends or family, where people I don't know I'll charge a few bucks.

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    I think I was one of the other few people who actually received an actual bored TB from 4U2QUICK. I got in on his first run when he was only boring them to 57mm with no port and polishing at all. Ended up doing it myself later however.

    As for boring services, I have seen Maxbore thrown around a few Honda forums I visit regularly. Their main business is Honda/Acura TB's, but they also have done GM, Toyota, ITB's, and bike TB's. They say they will bore any throttle body, and make a new butterfly out of brass. They also clean, scrub, and port and polish the TB's as part of the price. Looks like the price is $125 for anything domestic and might be worthwhile looking into. They say turn-around time is 2-3 business days. I've never contacted them, but if somebody is interested just shoot them an e-mail. I got all this info off their website here:

    http://www.maxbore.com/index.html
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    Quote Originally Posted by Beodude123 View Post
    If that is the case, why do people charge so much to do them?
    Because they're doing it as a business. My friend works at a manufacturing facility, and was receiving his regular hourly wage while he was doing it. He often had times when there was nothing to do, so he made an extra $10.

    Quote Originally Posted by krux View Post
    You can't just make a round plate. I know that wont work since a previous member that use to make parts here did that to my TB and it never ran right. I wasn't the only person that had the issue since we found out later in several other pm's that it was to a couple of people. Matt(Powder) knows about what you have to do to them in order to make them work.
    The plate he made was modeled on the original, just larger. Plate was laser-cut. The place's equipment is all CNC, so he said it was really easy. Fits just as well as the stock one did.

    A machine shop could probably do the boring and maake the plate rather cheaply. My friend said it shouldn't take on more than an hour. You would still have to do the P+P yourself though.

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    If the throttle plate is properly fit to the throttle bore and the intake manifold bored to accept the larger TB, there should be no problem with loss of response.

    The throttle plate needs to be machined round while held in a jig at 7.8 to 8 degrees to make the oval shape and angled edges. A permanant jig should be made and used to standardize production. In theory you could machine 10-20 throttle plates at one time. Hand fitting and surface finish are other steps that need to be done carefully.

    I would be willing to help an experienced machinist (such as Powder) set up production. For complete machining, hand fitting and surface finish $160-200 plus core charge and shipping would be a fair charge for a straight bore 57.5-58 mm TB including a hand fit throttle plate and surface preparation. Part of the critical setup is finding the true centerline of the existing bore and making sure it is orthogonal (90 deg) to the plane of the baseplate. If you just haphazardly set up and bore the throttlebody and you are off angle a bit, you may break through the sidewall in thin spots. The Contour TB I used was down to ~1.27 mm (0.050") in one spot, we measured as we went. I might have been able to go out to a full 58.0 mm but the wall would have been ~1 mm thick.

    It would be better to build these in lots of at least 6 at a time to keep cost under control. Expect a defective TB once in a while and factor that into the cost (or sell as seconds with aluminum filled epoxy repair.) I have three extra TB's in my possession.

    Images below show a 57.6 mm TB using a '96 Contour TB. With more metal to start at the top of the TB I was able to (CNC) machine a close to correct airhorn shape. This has been hand fitted, polished and chemically anodized. At 8+ years old it shows little corrosion. (I won't be making any more of these because of cost. This one would cost a lot more than $250 because of time and materials.)



    Last edited by JonsZX2SR; 12-30-2009 at 02:35 PM.
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    Quote Originally Posted by JonsZX2SR View Post
    If the throttle plate is properly fit to the throttle bore and the intake manifold bored to accept the larger TB, there should be no problem with loss of response.

    The throttle plate needs to be machined round while held in a jig at 7.8 to 8 degrees to make the oval shape and angled edges. A permanant jig should be made and used to standardize production. In theory you could machine 10-20 throttle plates at one time. Hand fitting and surface finish are other steps that need to be done carefully.

    I would be willing to help an experienced machinist (such as Powder) set up production. For complete machining, hand fitting and surface finish $160-200 plus core charge and shipping would be a fair charge for a straight bore 57.5-58 mm TB including a hand fit throttle plate and surface preparation. Part of the critical setup is finding the true centerline of the existing bore and making sure it is orthogonal (90 deg) to the plane of the baseplate. If you just haphazardly set up and bore the throttlebody and you are off angle a bit, you may break through the sidewall in thin spots. The Contour TB I used was down to ~1.27 mm (0.050") in one spot, we measured as we went. I might have been able to go out to a full 58.0 mm but the wall would have been ~1 mm thick.

    It would be better to build these in lots of at least 6 at a time to keep cost under control. Expect a defective TB once in a while and factor that into the cost (or sell as seconds with aluminum filled epoxy repair.) I have three extra TB's in my possession.

    Images below show a 57.6 mm TB using a '96 Contour TB. With more metal to start at the top of the TB I was able to (CNC) machine a close to correct airhorn shape. This has been hand fitted, polished and chemically anodized. At 8+ years old it shows little corrosion. (I won't be making any more of these because of cost. This one would cost a lot more than $250 because of time and materials.)




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    I just sent my tb out to maxbore overall price with shipping it there was $135. I will have to write a reveiw when i get it back.

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    Quote Originally Posted by zx2Dirttrackracer View Post
    I just sent my tb out to maxbore overall price with shipping it there was $135. I will have to write a reveiw when i get it back.
    Good deal! I'd like to see the results and your review of it...

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