Last night I was driving home when out of nowere another rx7 convertible appears next to me when the light hit green we both floored It and the other rx7 smoked me by like 8 car lengh and It was stock.Ive done the hole exoust/intake stuff on my car does any body know why my car in running so slow???I feel like Its not getting alot of speed like It should be!

 

you have a 3.9 rear end and your auxillary ports aren't working

but seriously, is your car an automatic?

 

No standard!

 

There could be 100 things.... Any pics of your car.? HOW MANY miles on your car?

 

121 k

 

what RPM you change gears?
Fuel pump could be playing up

 

4000

 

Check to make sure your ports are working, and check your fuel pressure. There are several factors that could be contributing to this.

 

the flux capacitor isn't properly functioning =D

but really, you probably need to rebuild that tired engine.

 

that could be the problem, horsepower in a rotary increases exponentially as you get to the higher rpm range.

 

4k? Man my powerband starts at 3k.. but I am without the 5th and 6th ports... You do know that these cars will pull clean to 7k without sweating right?

 

Standard? haha

 

Its not a delorean!lol

 

Mine is a non-self selecting transmission.....

 

At around 4k you have intake ports opening and secondary injectors coming on, thats where the fun begins. Drive it harder plain and simple.

 

its not a v8 **** at closer to redline

 

Lol..I **** when it goes over the redline....lol

 

121K tired Get compression numbers and then determine that.

 

Seriously, who shifts at 4000 RPM when they're rippin it.

Before asking whats wrong with your car, ask whats wrong with your driving.

 

Dude, you probably have like 80 hp at 4k. I think peak power, at least in an S4, is somewhere around 6800 RPM. Don't be scared to hear that beep

 

buy a t2 and shift @ 7k. I would if i wasn't hitting fuel cut...at 4k is right about when my t2 starts to rellay pull hard. Your aux ports open at like 3800 (i believe) which is where the fun begins, as well as those happy sec injectors. More fuel and more air = fun.

 

 

Damn my car is slow, I shift before the 2ndaries kick in....

 

Lol sorry I guess It was my driving would a tune up help It and what parts do yall suggest I change???

 

Spark plugs, wires, oil change, fuel filter and the filter in the tank (sock filter), H2o trick, air filter, injector cleaner or send them off to be cleaned and flow tested, also make sure the port actuators are working well..