Common Performance Enhancing Mods
Post your common performance enhancing mods here.
I'll start with a few things which show little to no gain and, IMHO really aren't worth the cost of the packaging they come in:
So post up your ideas for common performance enhancing mods. Please try to include the cost, gains or other observations you noted, possibly a link to a thread here discussing the mod, and anything else that would help in the discussion. |
Change the distributer cap and rotor. Yes the 4.3l engine still has a distributer cap and rotor. I bought my 1997 Blazer with 105,000 km on it and it was running rough. Found out by accident that it had a distributer cap and rotor - I thought that it was a coil pack as it doesn't look like a traditional distributer. As part of my routine maintenance I decided to change it out. Well, I'm pretty sure that they were the original parts as the rotor and cap were extremely pitted and corroded. Now the engine idles smoothly and I have a little bit more power all for about $20.
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I bought this inexpensive Walker Dynamax cat back 2.5" dia exhaust kit from Rockauto. The stock exhaust goes from dual 2" pipes from the manifolds to a single 2.5" collector to the cat then 2.5" to the stock monster size muffler and then exits the muffler back down to a 2" exhaust pipe! What is with that? That's a 60% restriction just by pipe size.
The Walker kit is inexpensive and very easy to install. Fit perfectly. I put the passenger side up on jack stands and took off the passenger rear wheel. The hardest part was removing the 3 bolts at the header style connector at the cat. I ended up breaking the nuts off. The rubber exhaust hangers required lots of WD40 and wiggling back and forth to get them off. The sound is a very mild rumble while driving and quiet at idle. The engine feels more responsive now where before it felt very choked. |
Originally Posted by blanchae
(Post 682298)
I bought this inexpensive Walker Dynamax cat back 2.5" dia exhaust kit from Rockauto. The stock exhaust goes from dual 2" pipes from the manifolds to a single 2.5" collector to the cat then 2.5" to the stock monster size muffler and then exits the muffler back down to a 2" exhaust pipe! What is with that? That's a 60% restriction just by pipe size.
The Walker kit is inexpensive and very easy to install. Fit perfectly. I put the passenger side up on jack stands and took off the passenger rear wheel. The hardest part was removing the 3 bolts at the header style connector at the cat. I ended up breaking the nuts off. The rubber exhaust hangers required lots of WD40 and wiggling back and forth to get them off. The sound is a very mild rumble while driving and quiet at idle. The engine feels more responsive now where before it felt very choked. I can't say I've noticed much improvement in performance. I purchased it for its ease of installation, only discovering later that it was considered a bit of an upgrade. |
The best you can do if you have the money( what ive done) is, Cam, headers and high flow exhuast, CAI, Higher output coil, removed AC and installed electric fan, then have your computer flashed/tuned to accept these mods. I gain about 35-40 HP. Doesnt sound like much but you will notice it.
Agree, throttle body spacer, throttle blade mod, ebay chips are useless. Pretty much much any mod will net little gains as the computer will adjust to changes bringing it back to stock. |
Came across this youtube video with a free mod to the throttle body plate to improve performance.
I did it a bit different from the video. I removed the throttle body off the intake, disconnected the wiring but left the throttle cables connected. I covered the intake opening with a rag and used a socket as a spacer to keep the throttle plate opened while I ground off the rivet heads with a dremel tool. Used a punch to punch the rivets out and removed the plate. Plugged each of the holes with a large pop rivet and washer. Blew out any filings and put it back together. It was simple. Tricky part was to grind the rivet heads off without scratching or damaging the throttle plate. |
like the 2 posts above say, it does nothing and can end up damaging your motor
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Originally Posted by newguy
(Post 687622)
like the 2 posts above say, it does nothing and can end up damaging your motor
As for damaging your engine? Really? That would mean that every time you push the pedal to the metal, the butterflies would open wide and damage the engine. Same effect. |
Seems to me that what is accomplished with that mod is a greater open cross-sectional area versus throttle position curve. I.e. at a smaller throttle plate angle there is a greater open cross-sectional area. How this affects the computer is hard to know. The person who posted the video is convinced that it makes the motor more more responsive.
But for anything that is engineered, there are reasons something is done and there are always trade-offs. These can be:
With almost or over 20 y.o. vehicles, we may not care much about emissions and doing this mod could increase mileage, power or torque. Then again when you modify one part of a system, there could be unforeseen consequences in other parts of the system. Whatever these changes are, they may be good or bad depending on your point of view. |
It is interesting that I find the mod more responsive and to my liking and Swatlkk found it too sensitive. Also, historically there is no deflector plate on the throttle butterflies. I agree that the deflector plate is attempting to change the cross-sectional area versus throttle position curve at low positions. My preference is to remove it as it makes the truck more responsive at the low throttle positions where I drive 90% of the time.
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