63 mm Throttle Body - ZR-1 Net Registry Forums

Jagdpanzer · 10-30-2007

I see a lot of Z owners mention 63mm throttle body as one of their mods.
Who makes it and about how much $?
How does it differ from the stock throttle body and when does this mode make since?

10-30-2007

The two big blades inside the TB are a 58mm size. The bore is enlarged to 63m and new butterflies are cut out and mounted up.

Cost is around 300.

The gain on a P&P plenum and injector housing set is minimal.

Ccmano · 10-30-2007

Quote:

Originally Posted by Jeffvette

The gain on a P&P plenum and injector housing set is minimal.

That's interesting Jeff, are you saying the 63mm TB isn't really worthwhile unless there are major air flow enhancements to the heads?

Hans

blackjack · 10-30-2007

thats an interesting topic...i also heard that 58mm is big enough to feed a 350 cu.in,no matter what kind of mods you have...any real world results?...dyno comparo?
bj
91/1735

10-30-2007

I would rather see somebody put the 300 bucks towards headers than to modify the TB.

GOLDCYLON · 10-30-2007

Quote:

Originally Posted by Jeffvette

I would rather see somebody put the 300 bucks towards headers than to modify the TB.

This is what Jeff told me 6 months unless you punch the block you are throwing your money away on this TB mod.

bradslt5 · 10-31-2007

How about if ya give it an upper -cut !!!!!!!!!!!!!!! Sorry couldnt help my self

cuisinartvette · 10-31-2007

IMO if a 48mm TB will support a 502 CI BB the stock TB should be plenty for the LT5 even with plenty of porting. Sure, its comparing 2v to 4v but airflow is airflow.

10-30-2007	#1
Jagdpanzer Join Date: Apr 2007 Location: Northern VA Posts: 2,646	63 mm Throttle Body I see a lot of Z owners mention 63mm throttle body as one of their mods. Who makes it and about how much $? How does it differ from the stock throttle body and when does this mode make since?

10-30-2007	#2
Jeffvette Guest Posts: n/a	Re: 63 mm Throttle Body The two big blades inside the TB are a 58mm size. The bore is enlarged to 63m and new butterflies are cut out and mounted up. Cost is around 300. The gain on a P&P plenum and injector housing set is minimal.

10-30-2007	#4
blackjack Join Date: Aug 2005 Location: north of montreal Posts: 510	Re: 63 mm Throttle Body thats an interesting topic...i also heard that 58mm is big enough to feed a 350 cu.in,no matter what kind of mods you have...any real world results?...dyno comparo? bj 91/1735

10-30-2007	#5
Jeffvette Guest Posts: n/a	Re: 63 mm Throttle Body I would rather see somebody put the 300 bucks towards headers than to modify the TB.

10-31-2007	#7
bradslt5 Join Date: Oct 2007 Location: lone pine and mammoth lakes ca. Posts: 544	Re: 63 mm Throttle Body How about if ya give it an upper -cut !!!!!!!!!!!!!!! Sorry couldnt help my self

10-31-2007	#8
cuisinartvette Join Date: Aug 2005 Location: San Fernando Valley, CA. Posts: 896	Re: 63 mm Throttle Body IMO if a 48mm TB will support a 502 CI BB the stock TB should be plenty for the LT5 even with plenty of porting. Sure, its comparing 2v to 4v but airflow is airflow.