Throttle body upgrade options

hooey_b

Just a question(s) for y'all:

I've been doing research on throttle body options for the vq37vhr, and the only solid thing i could find was an option to have the stock 58's bored out to a nice 63mm on the stock tb's.

I've heard since that the tb's for the Maxima (03-08 i think?) have the same connections, but just need a custom bracket to make fit. I was thinking about just going ahead and doing it myself, but i wanted to make sure there's wasn't anything out there that i've overlooked.

next slew of questions:

-for that much of an increase in flow, how risky would it be to run (assuming i get the maxima tb's to fit) them on without a tune?
i'm super cheap (aka broke) and don't have the tune on the schedule until about mid-end of next year.

-would it create a significant of a choke point if i don't up the diameter of my intake tubes?

-can anyone speak to this as far as experience or what you've seen? it doesn't have to be on the vq37vhr, just some details on what to expect from that much of an increase of air flow.

Boss_302

Starting in the middle is not the best place to start. You will never see the real benefit. You still have your choke point in the front, filters intake tubes ect. and going too large throttle body I would think the flow of the stock top intake manifold starts to comes in to play.
Money well spent is improving the flow to the stock throttle body's and get the most out of them, filters and intake tubes. Next if you are skillful, you can clean up the upper intake, its not that hard to do , you just have to be careful and smart about it, or go the safe way and buy one from Z-1 or deal with one of the other options on the forum. I porting the top myself, using high speed cutters that you would use on aluminium , I found a variable speed hand drill worked the best. It gave me more control working with the plastic composite manifold. The stock intake setup is pretty efficient for what it is, it has a few rough spots that need to be address, but the gains are marginal, you are not going to find 50 HP.

Array

Upgrading TB's haven't proved much if any gain, as far as I've heard. Like Boss_302 stated there are many other bottle necks that will need to be taken care of beforehand to really see some improvements. No denying it may work, just not as much as you may hope for.

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2012 370z 7AT- ES2 with PSS, K&N Drop-ins, LED's all around, Berk HFC, FI CBE non-res, KW V1's
2003 A4 5MT- The Beater

EzDz

Wait about 3 months and ill have a shiny new aluminum manifold for everyone to put on for the new season