negatives of a bored TB?

Jeff9 · 02-09-2008, 04:26 PM

I decided that I'm going to bore my own TB to 63mm. I've read about all of the positives, but are there any negatives of the finished product? The last thing I want to do is compromise a perfectly working engine.

Jeff

XJLI · 02-09-2008, 04:29 PM

at 63mm you're gonna need a new butterfly.

XJohnnyC · 02-09-2008, 04:53 PM

Negative is if you screw it up, you're ****ed. If you insist on doing it yourself, have another TB on standby.

mall_crawler · 02-09-2008, 05:01 PM

x2 that^^^^^

**CJ7-Tim** · 02-09-2008, 06:12 PM

63MM is rather extreme unless you have made other substantial modifications to the engine. For 63MM you should have had work done to the head, a high flow cat converter installed, free flow exhaust, and have installed some higher flow injectors and even perhaps a performance chip. Plus as stated you will need to fabricate a new butterfly.

A cat-back exhaust and a K&N style filter really compliment a 60MM throttle body and would be all the modifications needed to take full advantage of the bored TB. Your stock butterfly can still be re-used.

Steamer98 · 02-09-2008, 06:17 PM

A whistle if you dont ease the edges of the sensor ports. Other than that I would agree with Tim in that its just part of the equation.

Jeff9 · 02-09-2008, 06:52 PM

Ok thanks guys, I'll go with a smaller diameter.

Jeff

RogueXJ · 02-09-2008, 07:14 PM

whats a decent Bore size to get better throttle response?

tdogg55555 · 02-09-2008, 07:43 PM

60mm to 62mm is the usual size for the finished result. I cant really think of any negatives, except the whistle when your acceleratiing.

XJLI · 02-09-2008, 08:21 PM

60mm is the max for the stock butterfly, and the max I would go without a lathe.