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Larger Throttle bodies...?

Anyone ever thought about using larger throttle bodies? I sent an email over to MaxBore to see if they would be willing to look at boring out a 370Z TB.

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Old 10-25-2011, 04:12 PM   #1 (permalink)
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Default Larger Throttle bodies...?

Anyone ever thought about using larger throttle bodies? I sent an email over to MaxBore to see if they would be willing to look at boring out a 370Z TB.

Obviously enlarging the intake manifold inlets is a must, but from my experience with all motor cars, this can really free up some hidden power.

http://www.maxbore.com/

Thoughts, ideas or opinions?

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Old 10-25-2011, 04:20 PM   #2 (permalink)
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Curious what that would do with the Motordyne Plenum? Would it foul up your A/F ratio?
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Old 10-25-2011, 04:22 PM   #3 (permalink)
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Quote:
Originally Posted by UTAMAV View Post
Curious what that would do with the Motordyne Plenum? Would it foul up your A/F ratio?
I'm sure it would alter them some... you really want to tune the car every time you change something. I kinda regret not getting the Uprev as the first thing I did.

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Old 10-25-2011, 04:26 PM   #4 (permalink)
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OEM throttle body is good enough
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Old 10-25-2011, 04:37 PM   #5 (permalink)
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Originally Posted by G37sHKS View Post
OEM throttle body is good enough
Good enough for what? a million hp?


Sure there has to be SOME limitations to the stock stuff. I bet you would see gains if they were bored, bored intake manifold and a ECU tune.

Side note, does anyone know what the stock size is?
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Old 10-25-2011, 06:47 PM   #6 (permalink)
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I would be interested to see if annual gains came from it. I would think if it were to make power that a company would have already done so... then again I'm not qualified to know this. Might make no power and might make more than one would think.
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Old 10-25-2011, 06:57 PM   #7 (permalink)
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From what I've seen over time there can be some very small gains in HP. But it is defiantly a art to doing it. Not worth the cost though. And if someone messed one up, your going to pay big to get another.
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Old 10-25-2011, 08:01 PM   #8 (permalink)
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On cars with regular throttle plates, it usually just runs like crap on idle (unless you match the bored throttle with a new throttle plate) and you gain like 3 whp..

However, since throttling is mostly handled by VVEL, it might work well...

Not sure what would happen with dashpot calculations on decel -- I think that's one of the few times the throttle plate actually does anything, and the extra volume could have it running too lean and stalling.

Nobody's attempted this yet?
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Old 10-25-2011, 10:35 PM   #9 (permalink)
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Looks like Impul has a throttle body kit.

370ZTUNE.com
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Old 10-25-2011, 10:58 PM   #10 (permalink)
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Those are cheap.
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Old 10-25-2011, 11:12 PM   #11 (permalink)
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Totally worth it though
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Old 10-26-2011, 05:06 AM   #12 (permalink)
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Whats the thottle bore on the stockers?
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Old 10-26-2011, 10:11 AM   #13 (permalink)
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Quote:
Originally Posted by SPOHN View Post
Those are cheap.


When you talk about all motor power, the gains may be minimal, but hook them up on a boosted engine and the gains may actually be worth it.



There is for sure an art in boring them, and I think combined with the UpRev, you'd be able to tune out any changes in AFRs that it occurs. For a few hundred bucks, it might be worth it.

I wonder if motordyne is able to over bore their manifold... hmmm...
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Old 10-26-2011, 11:19 AM   #14 (permalink)
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Probably minimal but the only way to really know is via test.
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Old 10-26-2011, 02:21 PM   #15 (permalink)
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Has anyone thought about smoothing out the throttle body where it meets the intake and making that lip smaller to smooth air flow? I did this with my old car and it made a very slight difference, but it's cheap and easy.
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