Can anyne pls tell me or point a write out of how to do the "Throttle Body Bump Stop Mod" with a voltmeter e.g. wherer to connect voltmeter probes and what coltage to look for.

Can I measure the voltage by moving the throttle cam with hand in engine bay and not with the accelerator since I will have to do it just by myself?

Thanks,

Adnan K

 

installuniversity.com, LS1info.com, etc.... I havent actually modified mine yet, but how I checked was to unplug TPS, place a 16g wire in the blue lead(i think thats the color, it is the topof the three like a pyramid)clamped my voltmeter to the jumper wire and the grounded to the battery. turn the key to the on position and walked up front, opened the TB with one hand and looked at the V w/ the other. Mine measured under the recommended, what is it? ah, like 4.6 is it? anyway, I got a little room to grind, BUT, I am not confident in my voltmeter so I'm going to wait to get a dead on accurate one. Wish I had Autotap. Good-Luck.
Charlie.

 

guys, if you didn't know we have an adjustable setup on our ported units. It allows you to run as much a possible and if you go to far dial it back. Bauer Racing Engines Throttle Bodies

Bret

 

I posted a detailed description on how to do it in August to CAMARO_LS1. Just hit the search button and type in throttle body bump stop mod, then go to reply 13. This should tell you everything you need to know.

 

Also, what gauge wire should I use to measure the voltage.

Last, why do I have to use wires, can't I connect the leads of the multimeter directly on to the plug to measure voltage?

Adnan

 

Any guage is fine, ultimatly its going to goto the multi or voltmeter gauge anyway. Just a sensor, not much power flowing. You can put wires in the sensor but you have to connect the sensor back up to the TB, and unless you can aim one little coper strand in there it wont work. I just took wire cutters and moved about a mm of wire off and used that, then covered it up with electrical tape. You should read 4.7v max.

 

T B STOP
Throttle Stop Modification

Some of the throttle stops do not allow the throttle plate to open all the way, as shown in this photo. This is a simple mod which will allow the throttle plate to open all the way.



The throttle is labeled A, and the throttle stop is labeled B in the picture below.



On some cars, the throttle stop can protrude out (where the dotted line is) and obstruct the throttle's operation, preventing it from going all the way back (and thus opening fully). If you find that this is the case on your car, proceed with the following mod.

This mod is incredibly simple:

First, disconnect the throttle cable.

Next, hold the throttle open all the way and make a mark on the throttle stop where it hits, so you know where to cut away at it.

Finally, use a hack saw or a Dremel tool to slowly grind away the part of the throttle plate where it is hitting.

Reconnect the throttle cable and now your throttle plate should open all the way, like in the picture below.




The key to finding when to stop grinding is by measuring the voltage from the throttle position sensor.

If you look at the connector that goes to the throttle position sensor, there will be 3 pins (well holes for pins on the plug). They will be in sort of a triangle shape. 2 next to each other, and a 3rd that is sort of way out there. you'll know it when you see it. There's a blue wire going to this one as well.

That is the pin that you need to monitor (The blue wire).

Find some wire, about 30 inches long, and somewhere in the range of 20 gauge or smaller. Basically pretty small wire. Strip off a small amount and stick it in the female end of the pin with the blue wire. You want this wire to be small enough that there is still room for the pin on the throttle position sensor to still fit properly inside the female end. if the wire is too large, there wont be enough room for the pin and you could screw something up. When you look at it, you will understand.

Now, plug it into the throttle body. The wire you attached should be long enough to reach to a good grounding spot.

Using a voltmeter, measure the dc voltage between this wire, and a grounding point on your car.

It really helps to have someone else around because you will have to hold 3 things. Throttle body, wire to test, and voltmeter. I did it by myself, but it was a handful. If your voltmeter has clamps that will make it easier.

1) Open the throttle blade 100% or have your buddy do it for you.
2) Measure the DC voltage between the wire you attached, and the negative terminal. Bone stock, my TB measures 4.29 volts at WOT. Not nearly good enough!
3) Grind the bump stop until you reach the desired voltage. 4.7v (or higher) throws a SES code, so do not go past that! The ideal stopping point is right at 4.6volts.

Good luck! <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

 

Has anyone dynoed this mod, or are we just assuming it works?

 

On the blue wire I attached one of the ends of the volt meter and also attached the other one to the black wire coming out of the sensor plug.
Will this work right to read the voltage. Or am I doing this wrong? Is that black wire the ground?

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by ND4SPD:
<strong>I posted a detailed description on how to do it in August to CAMARO_LS1. Just hit the search button and type in throttle body bump stop mod, then go to reply 13. This should tell you everything you need to know.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Ya, find that post. It's very detailed. Thanks again Ken. On a side not, i'm now down to 13.0 from a 13.4 1/4mile. The TB Bump Stop Mod was the last one I did. My throttle blade wasn't anywhere near 90degrees.

Good Luck. Shoot me a PM if you need help.

Dan