TG02Z71

iTrader: (2)

Took off my intake tube off the other day and was kind of taken back at how small the throttle boby is on this motor. I've had alot of different crotch rocket bikes and did all my own carb work on them. The last 1000cc bike I owned had four 40mm carbs on it. It seems like it would be kind of restrictive for a 5.3l engine to be breathing through this one proportionally smaller opening. I have access to cnc machines to do modifications on just about anything that is metal and can be machined. Would it be worth it to bore this thing out, make a new throttle plate or maybe just port the thing? I could by reverse engineering the original, build a completely new peice from solid billet stock with mods. I know from having many different bikes that a smaller carb or throttle body usually makes more torque and has better throttle response, but have not messed with these motors enough to know the results. If you have any experience please chime in. If you have an original throttle body you would not mind donating or selling cheap I would be willing to do mods on it for research sake.

yellow4.8

I have had some one ask me to port my throttle body for a hundred bucks, they said it helps so if you can port it your self I would. I would check with more people first to see because I only heard from one person on this so I do not know if it really is a good idea.

TG02Z71

iTrader: (2)

$100.00 to port? Was this just basically a polish job or actuall removal or material by machining? TTT

v8

iTrader: (10)

shaner i think is the name of the guy who does the porting and yes he removes material in front of the blade path and smooths it out, personaly i have the bbk and have removed the spacer plate they send with it and made my own to match the 80mm opening, i will find out friday night at the track and see if its better with or without the factory plate.

TG02Z71

iTrader: (2)

Any pics of the porting job or the blade that you made for reference? I will probably use mine as a guinepig if I get enough feedback before I go and butcher the thing.

v8

iTrader: (10)

i used a 1/8" alluminum plate to use behind the bbk t/b because of its design.
do a search there is people that have done there own like 01thunder and i think 02denali has a pic of his on here as well, good luck

Gordy M

iTrader: (2)

The stock TB is 78mm and that is enough to flow 550 hp with the 85mm MAF. Porting will decrease air turbulence but unless you have SC/NO or big cubes it is adequate for most applications.

v8

iTrader: (10)

stock t/b is 75mm and well your right it will handle that much hp but i did gain 2mph with just the bbk t/b ran both t/b same night at the track switching back and forth to be sure.

TG02Z71

iTrader: (2)

Thanks for all the info guys, I'll do a quick search for more .