Mikz86ta
March 26th, 2013, 05:00 PM
So I been reading on some threads with people doing home made port jobs. This is basically on LS1 and Vortec TB units. Very similar in design.
I know on my 4.3 Votrec TB, they say going with the Marine TB Blade (or CFM-Tech Blade in which I did a long time ago), you up the flow to 75mm. Without the 'deflector' there was def a throttle response difference and upper RPM pull difference. No ill effects on mileage. Been in there since 2004.
The I read some going to 78mm which is been bored.
Some of the do-it-yourself guys are smoothing out the bore, making a sharper entry angle, taking off the inside ridge and the marine blade mod. No biggie I dont see except maybe you should do the MAF and VE tuning after. What do you think?
But my main concern lies in where some guys epoxy in the IAT opening (very large on these TBs) and leave a much smaller hole or two. Will that mess with the IAT function in controlling idle, corrections for AC, etc? Should adjustments be made if such a mod was made?
Thx in advance!, Michel
I know on my 4.3 Votrec TB, they say going with the Marine TB Blade (or CFM-Tech Blade in which I did a long time ago), you up the flow to 75mm. Without the 'deflector' there was def a throttle response difference and upper RPM pull difference. No ill effects on mileage. Been in there since 2004.
The I read some going to 78mm which is been bored.
Some of the do-it-yourself guys are smoothing out the bore, making a sharper entry angle, taking off the inside ridge and the marine blade mod. No biggie I dont see except maybe you should do the MAF and VE tuning after. What do you think?
But my main concern lies in where some guys epoxy in the IAT opening (very large on these TBs) and leave a much smaller hole or two. Will that mess with the IAT function in controlling idle, corrections for AC, etc? Should adjustments be made if such a mod was made?
Thx in advance!, Michel