so i got a chance to max out my car on a straight road...
the thing maxed out at 110mph... what gives?! my civic went faster than that!

anyone know a few reasons this could be? it an 87 SE

 

Dirty air fliter, clogged cats, low compression, non-functional 6PI, etc, etc.

I believe stock S4 NA's topped out at ~120mph, and you need ~30% more power to get from 110mph to 120mph so something's obviously amiss.

Have you changed wheels/tyres, gearbox or diff? If you have you might have thrown the speedo out.

 

when I first got my 2nd N/A, I went 120mph no prob. then, I changed the wheels/tires to some that were a bit wider, and stuck out a little. then, I could barely get up to 100mph, and lost a race to a friends jeep but the cornering was amazing!!!

wheels/tires can make a HUGE difference, even if the size is the same.

 

i have the stock wheels, but could prolly use better tires (have cheapies on there now). i just changed the plugs on it about 100 miles ago and oil. had a single cheapy muffler put on with a 2.5 inch pipe from cat-back. whats the 6PI and how do i check whether its working or not? sorry but i had miss posted when i said 110.. it was 102mph.

 

oh yeah i need new shocks too... would that make that big of a difference at top speed?

 

I believe the posted top speed for a stock N/A is 137MPH. If you cant get yours going past 110..something is definately wrong. Ive found myself going faster than that by accident Do a compression test, and varify that the auxillary ports are opening.

 

Ah, no. A TII can't do much better than that.

 

ok i did another run today and it is 110mph... the guage gets there and twitches slightly, seams like its trying to go faster but cant.

yeah i read the top speed was 137mph... thats why i think something is wrong.

how do i check the auxillary ports?

 

uhhh.. i hit 130-135 racing a 350z (speedo read 140) but im sure its that inaccurate when it gets that fast.

oh btw its a '89 n/a

 

Yes, I have heard and read many people hitting the 130s stock or nearly stock. Probably takes awhile, but the aerodynamics really let the car get up there.

 

hey, how fast should i be going when i hit 7000rpm in 4th gear?

 

In a 5-speed N/A with 4.10 rear end, about 120MPH.

 

Wouldn't altitude have a bit to do with it?

 

OK kids we need more info, like rpms, tire size, final gears. Something to think about, my 76 RX4 had 3.65 rear end and getting to 110 was easy and had lots of gas peddle left, going faster was *** dum, handling was poor and so where the brakes. now it has 2nd gen suspension with 4.1 rear and a lot more power and gets there real fast but it takes all most all of the RPMs to get to that same speed, so do some math

 

Im not sure about altitude, soince I was at sea level, but when I used to own my NA I topped the thing out at 136, I had 16 inch wheels with 245 in the back and 225's in the front, it took me like 2 minutes to squeeze my last 15 mph out of it, ofcourse I then got pulled over and the cop just started laughing at how crazy I was and let me off with a warning, he clocked me at 136, my speedo was going insane, it said more but I knew it was wrong. A REALLY nice guy, he said that I was lucky no one was around and not to do it again. (cuban cop, lol)

 

I've gotten to 127mph and that was all I had !!

 

Don't shift into 5th and bury the tach in 4th gear...


-Ted

 

i got my dads 4 door 105hp civic to 116mph.

 

I have seen a video of the FC against the porsche and the guy got it up to 130 in 5th and they were video taping it. Granted the car is no longer new it should be able to hit atleast 120.

 

I've done 130mph in my 90 GTU going down I-10 course the alignment was off so I couldn't see out any of the mirrors lol it was so much fun.

 

135-140 tops... factory sized tires and "vert" BBS rims

-Markus (Devoted Rotor)

 

i think your talking about the top gear video. it was an 85 fc n/a 2+2 and they were testing it with the porsche 944

 

Ive irked out just over 125 with 2 people and subs.

 

Top speed is determined by a few factors mostly.

1. Power, more power, the faster you will go
2. Aerodynamics, makes the applied power get you farther
3. Gearing, helps you apply the power the best

Thats basically it. Weight alot more to do with acceleration than top speed.

 

i dont know about you guys but if i was going anything around a 100 or more i would be more concerned with the road than looking at my speedometer. Also got a joke for ya.....What is the difference between going 100mph and 120mph other than the speed? the answer is open and closed casket.