Speed Question

[Squigs]

Ok so i have a 1997 eclipse gs-t spyder. Only engine mod is a cold air intake, stock turbo, and an upgraded exhaust. So anyway, i was testing my cars speed at the airport. I hit 142mph, and let off b/c end of runway. 2nd run, i got to 130ish and it just cut off on me.. just wondering what could of caused it to cut off. Btw, this was on 2 seperate days.

 

[keat]

Ok so i have a 1997 eclipse gs-t spyder. Only engine mod is a cold air intake, stock turbo, and an upgraded exhaust. So anyway, i was testing my cars speed at the airport. I hit 142mph, and let off b/c end of runway. 2nd run, i got to 130ish and it just cut off on me.. just wondering what could of caused it to cut off. Btw, this was on 2 seperate days.

Hmm weird. I know there is a speed cutoff but I always thought it was at 140. And you got past that..then couldn't get to it again. Someone else will be of more help but I just find this weird

 

[Squigs]

Yeah, i looked down and saw my needle lil voer 140 so i let off..2nd time i saw it at 134? and it cut me off, and slowed me down.

 

[dsm-onster]

Ok so i have a 1997 eclipse gs-t spyder. Only engine mod is a cold air intake, stock turbo, and an upgraded exhaust. So anyway, i was testing my cars speed at the airport. I hit 142mph, and let off b/c end of runway. 2nd run, i got to 130ish and it just cut off on me.. just wondering what could of caused it to cut off. Btw, this was on 2 seperate days.

Did you have a logger?

 

[Squigs]

I dont think so, or atleast not that i know of

 

[dsm-onster]

Unless you have a log of the event, then we're all speculating. Do it again and log the run.

 

[cjb26]

i dunno about that 140 cut off either, is that true? i've definitley gone past that and no cut off

 

[turboglenn]

Some people may have seem to have went faster than the speed limiter will allow, but i think a lot of that can be atributed to speedometer error. It's nearly impossible to have a 100% accurate speed measurement at all speeds that your car can reach. So manufacturers make them as accurate as they can be in their most driven ranges 45 - 60 MPH. Then everywhere else you will be off by a certain %..the faster you go the greater the % of the total # or MPH you will be off by. my motorcycle is the greatest example, the motor revs to a 13,500RPM shift point so that i can do 115MPH in 2nd gear (indicated) But yet in 6th gear at an indicated 182 MPH i know that i'm probably barely touching 165- 170MPH because of the factor of speedo error.

Sounds like the speed imiter to me though. And without a log, there is really no definate conclusion anyone can come to.

 

[-TunedDSM-]

i dunno about that 140 cut off either, is that true? i've definitley gone past that and no cut off

2g AWD's do not have a speed limiter installed in the ecu being they came with Z-Rated tires from the factory. Only FWD 2g's have the speed limiter. I am not sure about 1g's though.

 

[jaday]

But all of this doesn't really explain the 12ish mph difference in the two runs. I agree that you need to log to see exactly what is going on. Weather, current engine temp, or other things could have played a factor on the change...