Throttle Body mod
 

Has anyone done the Throttle body mod on there 4.3l vortek? I was thinking about doing it today and wanted to have some others opinions on it, like do you get more torque and does it save gas, from what I've heard it does and could get atleast another mile per gallon. And the mod I'm talking about is cutting that scoop thing that's on the bottom side of the throttle plate

Many have, myself included on my old 2000 Bravada. About the only thing I can say for sure that it did was make the throttle more sensitive. As for more torque, power, or better mileage, I noticed none of these. Some will argue that it produces more power/torque, but my counter to that is that it is producing the same power/torque, just at a lower throttle angle. Wide open throttle runs from 0-60 recorded on my old Autotap PC based scantool showed absolutely zero difference in 0-60 time pre/post modification on a 5 run average. I didn't mind the overly sensitive throttle, but my wife refused to drive the truck after I did this modification.

You can search for "throttle+body+mod" or "throttle+blade+mod" and find what others have to say and/or take a look at the Related Topics links at the bottom of this post.

agree with Swartlik. It is there for you to be able to control accel.

That and it is supposed to evenly distribute the egr gasses too.

I just moded my 2001 chevy blazer an hour ago and it has given alot faster acceleration

Not trying to jinx you. I've read threads here from members who got a check engine light after throttle body mods. They solved it by putting an unaltered one back on.

I KY check engine light I get is from my secondary air injection and that's been coming on for a while, but if I get one from this mod I'll just put a new throttle blade back in

It's the old "I did something therefore I notice a difference" effect.

In my day that was flipping the air filter cover.

Make those qjet secondary's HOWL!

Heck Yeah! I loved my Quadrajunk.

We had a 73 K10 and a 74 heavy K20 on the farm growing up. I started tuning them up when I was 10 and could make those old qjets work great. If I remember correctly I did my first well plug reseal at 12!

My K5 still has the old qjet on it and it runs great! I had to rebush the primary throttle shaft and seal the well plugs, but that's common on them.

Naw I wouldn't say it has more acceleration if it didn't, I have done 0 to 60 in 12 seconds like 6 months ago and I just did another 0 to 60 in 9 seconds, so yeah it has more acceleration.

You timed one of those incorrectly if you picked up 3 seconds (25% improvement). :icon_screwy:

How could I do it wrong, I've video recorded both times and I've watched them both and timed them on a stopwatch

The only difference the mod makes is from closed throttle it will open and allow air into the TB a bit quicker so it will feel more "peppy" from a stop to about 1/4 throttle but slamming the pedal to the floor will have the same effect with the blade there or not. I don't see 3 full seconds being shaved by a mod that only has a small effect below 1/4 throttle at best. I have done this mod myself and do think it makes a small difference from a stop but nothing more.

25% improvement would be the equivalent of adding 40-50HP which this mod DEFINITELY does not do.

Either one of your tests was uphill (pre-mod) and the next was downhill, you slapped a turbo on, or something else was influencing your results. Regardless, your findings are flawed as they aren't even in the realm of believable.

The reason I mention '5 run average' in my previous post is for this very case where something isn't right in one or both of your runs. A 5 run average would have shown you that something was off.

I'm not gonna lie I have done alot of stuff to my blazer in the past 6 months decides doing the throttle mod, I've added new gaskets and seals to the manifold and valve covers and cleaned everything up and I've added a new fuel injection spider added a new waterpump and new spark plugs and wires and put a brand new distributor and cap and rotor and I've even added a new abs control module and the throttle mod today, and I have done all these things after my last 0 to 60 about 6 months ago, so some of these other things could have added to it being faster but like I said before this mod has made the acceleration alot quicker. And has gotten 3 seconds faster

and for the record both 0 to 60 tests were on the same flat road, I live in florida where it's flat there is no up hill or down hill

Unless you put a stock throttle blade on ran 5 passes from the exact same starting point to the exact same ending point and then immediately swapped to a modified blade on and ran the exact same setup 5 more times and take the average from before and after you are not getting accurate results.

Temperature has A LOT to do with things as does accessories being driven. What was it, 90F+ six months ago in FL and now somewhere around 70F? Probably don't have to run the AC much this time of year. Just that means your observations are flawed and now you mention a sh!t ton of additional work htat has been done to it...

Just to put some more info out there, I saw just under a 0.8 second difference in the 0-60 averages for AC-on vs. AC-off in my old Bravada on a 85F day, absolutely no other variances and allowing a 10 minute idle session between each of the 10 total runs.

Listen, I completely believe that you think your truck got faster and if that makes you happy, good.

I've done 3 passes without the mod and got the same time of 12sec every time, and I have done 2 passes with the mod and got the same time of 9sec. And I have started at the same starting point and ending point that I did without the mod. It may be hard for you to believe but I've got no reason to lie, and I've already listed all the new parts I've put on. I'll do more passes tomorrow and see if I get the same time, the only difference between the passes is without the mod I did in the day time and with the mod I did right after dark on the same road at the same exact starting point and that is the only difference was the time of day, tomorrow I'll use dashcommand odb2 app in the performance tab and show screen shots

You have already invalidated your 12 second time, there is no question there. No need to further try to push your gains as no one here is buying it. That's why I said that if you're happy, good. No matter what you do from here on out (short of testing it with a stock throttle blade) will change my opinion of your comparison as it involved a truck with compromised injection, ignition, and various other systems for the pre-mod test.

Yup I'm happy with it and that's all that matters because it runs awesome actually better then brand new, I also have a jet performance stage 1 chip in it to but I had that in it over 6 months ago.

Another item that does nothing , 3 sec. Increase? How far , 5 miles LOL

There is no need to talk like that too other members. Keep things respectful for everyone's sake please.