Ok I was looking at a couple of things on ebay that r supposed 2 increase hp, etc. One was called a vortex generator that goes in the air intake and is supposed to spiral the air to increase gas mileage and hp. Then another thing was called a voltage stabilizer that connects to the battery and is supposed to make the car start faster as well as a few other things. I was wondering if anyone has owned any of these and can give me an opinion as to whether they r worth the money or not.

And one last question. Everytime I start to go past 85-90 mph in my 86 n/a auto trans rx7, I start hearing this fairly loud "DUUUHHHHH" kinda sound. I haven't got the tranny flushed out yet so I'm hoping thats what it is. I hope its not the engine. I'm wanting to eventually race my friends nissan 240, but I dont wanna ruin anything so I'm wondering whats causing that sound.

 

Vortex intake mods do nothing except cost $20. (Maybe this should go in the FAQ?) The Voltage Stabilizer is probably crap. A good battery is all you need.

Get a full tune-up first. And race on a strip.

The FAQ has info on tune-ups and is a good starting point for mods

 

They are junk, dont buy them.

Get rid of your auto and get a manual swap :p You will most likely lose

 

hmm, ok I won't buy them. How much would swapping to a manual cost? :P Well what kind of mods specifically do you recommend? I'm fairly new to cars, but I know the basics so I'm not completely dumb. But when someone says to make a mod to the exhaust or the air intake; what r they talking about? I know what the intake is, I bought a chip that went into the cold air intake sensor that was supposed to add more hp but I really didnt notice a difference. Where can I buy these parts at? And any ideas on that sound I keep getting at 85-90 mph?

 

Popular mechanics did a test on the Votex/Tornado intake devices and found on average a 5% power loss on vehicles using them, and about a 3% fuel consumption increase.

 

That chip wont do you any good either.

intake
https://www.rx7club.com/showthread.php?t=547242

install writeup
http://www.nopistons.com/forums/inde...&hl=custom+CAI

 

Please take that "chip" out. It is a .5 resistor you can buy at Radioshack. They do nothing. Browse through the forums and search around and you will find tons of info.

 

yea dont get any cheapo autoparts off of ebay. sorry some one hack into my comp n post it something stupid.

Manual tranny would help