i have a obdi2 ecu, my question is, is there a speedlimiter? i was told that at 120mph the fuel injectors cut off. i have a gsr with a greddy turbo(370 injectors). so whenever i race and hit 115mph i let off the gas becuase i dont want to detinate the turbo and have no fuel running through. if anybody can help id appreciate it.

 

ill repeat myself from yesterday:

no speed limiter.

its gear limited.

 

hmm , ive never hit a speedlimiter yet , iv had my car to 145 and still pulling hard but let off it at about 7k or so .
the only time i know of where the fuel cut kicks is at whatever rpm you car cuts at . like mine is 8600 i think is actual fuel cut

 

what do you mean "gear limited"?

 

limited by the gear ratio.

 

can you tell me where i can find out more about it? thank you in advance.

 

the fastest you can go is fuel cutoff in 5th gear, which should be just above 150mph.

 

http://www.bseries.net/html/specs/btrannyspecs.php




[Modified by PaChiLa Leader, 1:42 AM 8/6/2002]

 

i think top speed for a gsr os 160 because when doing 80 mph you are @ 4k. when doing 100mph you are @ 5k. when doing 120 mph you are @ 6k. and when doing 140 you are @ 7k. see the patern take the speed and divide it by 2. and i think our four bangers are more drag limited than gear limited depending on how much power you put out. our stock integs are drag limited not gear limited. oh i hit 140 in my GSR

 

JDMintegGSR is right. Stock, the GS-R is drag limited. Wind resistance will stop it at a135-140 mph. Given enough power, it could get to around 160. The ITR is the only Integra that is gear limited in stock form, its top speed is a little over 150 mph.


[Modified by Angry Joe, 8:48 AM 8/6/2002]

 

i wonder what the ITR cruises 80 at.... i know for me im at around ~4100 when going 80...

 

What about the automatic integras.... the fastest I recall my car getting up to was 120mph but I was far from redline.... it just wouldn't go any faster..... 4th on a auto is like ridiculously big because its over drive, I'm wondering if the autos have a governer or it just doesn't let the tranny rev past x,xxx rpms in 4th gear cause I couldn't get it going past 120mph and this was HARD pushing on the parkway (ob2 car also)

 

it should top out at about 150 with the windows up and no wind in your face....otherwise it will range from about 140-150 mph...ive had my speedometer burried before at 145 so i dont know how fast i was going past that.

 

itr at 80 is about 4200 rpms. . . . in 5th gear that is

 

whats the equation for taking the rpm and then getting the speed using the gear ration and final drive?

logically i thought it was always: (RPM/Gear Ratio)*(Final Drive)
but then in may i screwed around with equations and figured out the correct way, but am too lazy to try it again... does anyone know the proper way to do it?

 

yeah im thinking ur fuel cuts off when u hit readline only.

 

The easy way to find your car's speed at any rpm is to go to tirerack.com and find your tires' revolutions per mile specification, and then the equation then works out like this:

(rpm*60)/((gear ratio)*(final drive)*(tire revolutions per mile))=speed in mph

The factor of 60 is in there to convert the minutes in rpm to hours in mph.

 

huuuuh?
did you mean from rpm to RPS(econds)

 

i got my auto LS to about 140 and auto are also drag limited

 

So your saying my car might be able to top out more then you manual owners? Because I'm only drag limited.... interesting that when the car was stock the fastest I got her up to was 120mph on a relativly straight interstate that had no inclines in the section I was doing this..... does it take you guys a while to get from 120mph to 140ish? Cause if my 4th gear actually hit redline.... I know I would be going more then 140.... ******* final gear is long as fawk

 

dude you have a greddy turbo and dont know what gear limited is?

 

Yea DUDE, I have a 2000 GSR with greddy turbo( t3/t4 turbo, 370 injectors, hks super seguential blow off, vortec fmu, b&m fuel pressure regulator, skunk 2 cams, msd 6al ignition, apexi vfac, greddy turbo timer, auto meter air/fuel guage & boost gauge, greddy catback). At 5 lbs of boost Im 202hp to the wheels and a 179lbs torque, this is on 18" quantums. By the way not everyone knows what it is. Oh also I'm not a DUDE, Im a female. Thank you.

 

lol...
its ok baby...ill tell you
it means that at red line, on the car, you are limited to say 155 because of the gear ratio's
as oppose to drag limited which means you still have room in the RPM range to go up, but cant because the engine doesnt produce enough power to overcome the drag effect

 

thank you. but it doesnt matter now....lol. becuase the gsr isnt gear limited, its drag limited.

 

<--- wonders in the long run how many pistons will melt during a 115mph + freeway race/run with a turbo.... and/or how big the hole will be in the block when a rod shoots out..