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Old 09-13-2009, 09:29 PM
im the fit's Avatar
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How big is too big?
I'm sending my tb to Maxbore.com throttle body boring service and I would like to know how much bigger could I go without any drawbacks? I know I can google this but I would like to know your opinion..
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Old 09-13-2009, 10:05 PM
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Cant really bore that much with out getting bad idle from what ive read. I think someone posted about running a different TB.
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Old 09-13-2009, 10:08 PM
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Yeah it was a bmw tb, we do have a idle screw I think that you can adjust with an allen wrench
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Old 09-13-2009, 10:27 PM
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How much is the bmw tb? I was thinking about doing that.
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Old 09-13-2009, 10:35 PM
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Idk but I think it was a tb from a bmw z3 from uk
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Old 09-14-2009, 12:02 PM
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the throttle body from the bmw had a wired throttle.

try looking at using a ge8 throttle body since it is 3mm bigger than the gd3 TB.
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Old 09-14-2009, 02:23 PM
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Has anyone found out if they will machine composite T/Bs like on the Fit.... I noticed that all of the pictures on their site was showing aluminum T/Bs, but it seems that they would advertise that they would do composites if so.
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Old 09-14-2009, 04:12 PM
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the fit throttle body is aluminum but the intake manifold is composite.
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Yeah, I was thinking about you when i made that post. You're insane and I say go for it! you'll have the most badass fit ever.
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Old 09-14-2009, 04:47 PM
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the fit throttle body is aluminum but the intake manifold is composite.
You are right... My morning coffee must not have kicked in at the time I posted... I slept late.
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Old 09-14-2009, 06:40 PM
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biigger throttle body won't do anything for performance without head work and a cam. don't waste you time and money.
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Old 09-14-2009, 08:13 PM
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biigger throttle body won't do anything for performance without head work and a cam. don't waste you time and money.
It may help a little at higher RPM but at the possible cost of power loss on the bottom.... A change in cam timing duration for more power does pretty much the same unless you increase the compression ratio.... Mild port clean up is always a positive but remove too much metal and you are screwed.....The only 2 things that can be done that guarantees a power boost is forced induction or nitrous oxide and both of them require changes in A/F ratios and timing to realize maximum results..... Lowering the weight of rotating mass will not increase the power output of your engine but will allow more of the power to be used to move the car and is a win win thing to do with nothing but positive results.
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Old 09-14-2009, 08:41 PM
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biigger throttle body won't do anything for performance without head work and a cam. don't waste you time and money.
who says he isnt getting a cam?
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Old 09-14-2009, 11:48 PM
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who says he isnt getting a cam?
Well to get the most out of that combination he'd best add high compression pistons or it will be dead on the low end and kick serious ass if he does. If his engine is F/I/ skip the high C/R pistons.
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Old 09-15-2009, 11:48 AM
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high compression pistons + forced induction = bomb.com
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Yeah, I was thinking about you when i made that post. You're insane and I say go for it! you'll have the most badass fit ever.
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Old 09-15-2009, 12:06 PM
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high compression pistons + forced induction = bomb.com
Oh yes! A bad bad thing.... I am amazed at the amount of boost that some are using on their Fits with the stock C/R and valve timing.
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Old 09-15-2009, 05:17 PM
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the l15a is about at its max running 9psi. the f20c is the motor that truly impresses me. high compression and people are still running crazy boost out of it.

high compression + boost = no lag!!
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Yeah, I was thinking about you when i made that post. You're insane and I say go for it! you'll have the most badass fit ever.
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Old 09-15-2009, 05:33 PM
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can we confirm the ge8 tb fits on the gd3?
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Old 09-17-2009, 12:19 PM
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nope i cant confirm it but i have been wanting to try it... just no time to do it.
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