What do you think of this??? 78mm Throttle Body
#2
RE: What do you think of this??? 78mm Throttle Body
bump I was wondering the same thing...
#3
RE: What do you think of this??? 78mm Throttle Body
Well, considering that the only difference between the vortec 5.7L v8 throttle body and the vortec 4.3L v6 throttle body is the diverter on the throttle blade, I would say it's a waste of $170. I would just cut down the diverter. I wouldn't suggest removing it completely, but cutting it down to match the 5.7L diverter (~3/8" tall - stock for the 4.3L is ~7/8" tall).
I have mine completely removed and I am going to be getting a replacement. When I removed my diverter, I had no change in WOT performance as seen by my scans of runs up to 70mph. Only change that I noticed was throttle tip in. The pedal is MUCH more sensitive now at low throttle positions. But I will say that everything else is stock on my vehicle so maybe if you have an aftermarket CAI and headers, you may gain more by trimming down the diverter.
And I will say that the diverter has a purpose. It is meant to even out the flow of gasses from the EGR valve to all of the cylinders. You could create a rich condition in the front cylinders while causing a lean condition in the rear cylinders. All of which would even out by the time that the exhaust gasses got to the O2 sensors. I actually am slightly seeing this in my Bravada now. I pulled the plugs about a month ago and that is what prompted me to get a replacement throttle blade.
I have mine completely removed and I am going to be getting a replacement. When I removed my diverter, I had no change in WOT performance as seen by my scans of runs up to 70mph. Only change that I noticed was throttle tip in. The pedal is MUCH more sensitive now at low throttle positions. But I will say that everything else is stock on my vehicle so maybe if you have an aftermarket CAI and headers, you may gain more by trimming down the diverter.
And I will say that the diverter has a purpose. It is meant to even out the flow of gasses from the EGR valve to all of the cylinders. You could create a rich condition in the front cylinders while causing a lean condition in the rear cylinders. All of which would even out by the time that the exhaust gasses got to the O2 sensors. I actually am slightly seeing this in my Bravada now. I pulled the plugs about a month ago and that is what prompted me to get a replacement throttle blade.
#4
RE: What do you think of this??? 78mm Throttle Body
would you have to bore out the intake manifold if you got that?
#5
RE: What do you think of this??? 78mm Throttle Body
Most likely, Yes. Then you may have issues with the o-ring seal, etc. In reality, if a 350 v8 can use the same bore (75mm) with a smaller diverter, why would a 4.3L v6 need a 78mm one.
#6
RE: What do you think of this??? 78mm Throttle Body
ORIGINAL: swartlkk
And I will say that the diverter has a purpose. It is meant to even out the flow of gasses from the EGR valve to all of the cylinders. You could create a rich condition in the front cylinders while causing a lean condition in the rear cylinders. All of which would even out by the time that the exhaust gasses got to the O2 sensors. I actually am slightly seeing this in my Bravada now. I pulled the plugs about a month ago and that is what prompted me to get a replacement throttle blade.
And I will say that the diverter has a purpose. It is meant to even out the flow of gasses from the EGR valve to all of the cylinders. You could create a rich condition in the front cylinders while causing a lean condition in the rear cylinders. All of which would even out by the time that the exhaust gasses got to the O2 sensors. I actually am slightly seeing this in my Bravada now. I pulled the plugs about a month ago and that is what prompted me to get a replacement throttle blade.
#7
RE: What do you think of this??? 78mm Throttle Body
hyper pistons are actually pretty sensitive to lean conditions and will burn through. in race engines with hypers its reccommended to run a few jet sizes richer as a safety...
i'm with swartlkk. its a waste of $, unless you have made signifigant mods to necessitate more airflow into your engine. your current throttle body is probably flowing all the air your engine can handle, increasing that capability isnt going to do a thing unless your engine actually needs it.
i'm with swartlkk. its a waste of $, unless you have made signifigant mods to necessitate more airflow into your engine. your current throttle body is probably flowing all the air your engine can handle, increasing that capability isnt going to do a thing unless your engine actually needs it.
#8
RE: What do you think of this??? 78mm Throttle Body
not worth it- i will be porting my own maf and TB- but i wont port the TB to much even when running 10+psi. theres no point. i will be getting a cfm-tech TB blade though. besides i hope to have a 6.0L LQ9 with a ford 8.8" and 4l80e in the blazer bye next summer (keeping the rearmount turbo but upgrading to a T70 w/ .81a/r.
#9
RE: What do you think of this??? 78mm Throttle Body
This mod only makes sense if you plan on running at 4 thousand rpm or more. Sustained . and if you have a power booster of any sort (supercharger, turbo), Headers, free flow intake air system, and free flow exhaust if you dont have at least any of these items forget it! You will have to reflash your ecm , you will get codes, and yes you will have to enlarge your plenum. It will cause driveability problems such as lurching upon take off. The origanal throttle body is more than adequate. Just do as everyone is telling you remove the restrictor plate. And once you add power booster's then look at it again.
Thread
Thread Starter
Forum
Replies
Last Post
BlazinClinton
Engine & Transmission
1
03-01-2011 08:14 PM
Bigguns72
Full Size K5 (1969-1991) GMT415 (1992-1994) Tech
8
10-29-2010 06:52 PM
butters
Engine & Transmission
5
02-07-2009 10:59 AM