what affects top speed?
26-12-2006, 04:00 PM
#1
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what affects top speed?
somtimes when im doing high speed runs my car wont budge past 120, but other times it wil fly up to 134 and stay at max revs. then some times it wont get past 125 and will still have 1000 rvs to go.
so why does it do it, i was guessin wind direction?? happens in every car i drive.
so why does it do it, i was guessin wind direction?? happens in every car i drive.
26-12-2006, 04:04 PM
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would depend on where you are, tyre pressure, weight in the car including fuel etc, how polished the paint on the car was, road surface, temperature of the air, lots of things sounds like you need a bigger engine to me 
how do you no you were doing 134 anyway? did you have some timing gear fitted?
do you hit top speed in 4th or 5th
or have you always changed to 5th before the limiter. Also just because you have 1000 revs left dosn't mean your motor has the power to rev to that in a said gear.
how do you no you were doing 134 anyway? did you have some timing gear fitted?do you hit top speed in 4th or 5th
or have you always changed to 5th before the limiter. Also just because you have 1000 revs left dosn't mean your motor has the power to rev to that in a said gear.
26-12-2006, 04:07 PM
#3
just finding my feet
the MAIN THING is the tyre presure and if its up or down hill
also a shagged engine will loose power aswell as any loose bushes aswell ive noticed on my bmw,,,,,,,
oh and a fucked alternator will also affect top speed runs
i also find if im driving a car that cant go as fast as i feel it needs to its time to buy a new car
i remember jim used to bang his car off the limiter in 5th gear alot,,,,, he needed a faster car !!!!!
also a shagged engine will loose power aswell as any loose bushes aswell ive noticed on my bmw,,,,,,,
oh and a fucked alternator will also affect top speed runs
i also find if im driving a car that cant go as fast as i feel it needs to its time to buy a new car
i remember jim used to bang his car off the limiter in 5th gear alot,,,,, he needed a faster car !!!!!
26-12-2006, 04:08 PM
#4
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on something slow like a mondeo, its a lot about wind n slope.
i can see 134mph on the clock of my crappy mk2 1.8 mondeo on the right stretch of motorway, but mostly youd be lucky to see 125mph.
either way, thats 5-10mph slower in reality with proper timing equipment.
i can see 134mph on the clock of my crappy mk2 1.8 mondeo on the right stretch of motorway, but mostly youd be lucky to see 125mph.
either way, thats 5-10mph slower in reality with proper timing equipment.
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26-12-2006, 04:16 PM
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yeah im using timing gear, and tyres, psi etc are all setup right. just weird the way i can do a few laps and on the straights hit 135 on the clock which timing gear says 128, then when i take a break and come ack it wont go past 120 on the timing gear.
26-12-2006, 04:19 PM
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Originally Posted by rssteve
do you hit top speed in 4th or 5th or have you always changed to 5th before the limiter. Also just because you have 1000 revs left dosn't mean your motor has the power to rev to that in a said gear.
or have you always changed to 5th before the limiter. Also just because you have 1000 revs left dosn't mean your motor has the power to rev to that in a said gear.
26-12-2006, 04:20 PM
#10
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i remember jim used to bang his car off the limiter in 5th gear alot,,,,, he needed a faster car !!!!!
sierra was safer... you felt like you were going fast n didnt need to go faster.
Beemer doesnt feel quick till it passes 140
(babanas per hour 
)
26-12-2006, 04:25 PM
#11
just finding my feet
even my bmw does 145 on the clocks,,,, but thats when i give up as it dont feel great at 135 to 140,,,,,, not the car but the cars im passing dont seem as safe
pikey held my poor motor at 145 on the clocks for about 12mins straight,,,,, all was well until we the rain got harder
pikey held my poor motor at 145 on the clocks for about 12mins straight,,,,, all was well until we the rain got harder
26-12-2006, 05:32 PM
#12
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mine's GPS accurate at 100, and 2mph out at 120, so i dont think the clocks are that far out at speed.
still, who cares what speed youre doing... you're too busy SHITTING YOURSELF
still, who cares what speed youre doing... you're too busy SHITTING YOURSELF
26-12-2006, 05:45 PM
#14
I've found that life I needed.. It's HERE!!
air intake temp needs to be taken into consideration aswell , by what is being said the first few runs record the fastest and then it drops , maybe its drawing in warmer air from around the engine bay
26-12-2006, 05:58 PM
#15
just finding my feet
Originally Posted by Jim Galbally
mine's GPS accurate at 100, and 2mph out at 120, so i dont think the clocks are that far out at speed.
still, who cares what speed youre doing... you're too busy SHITTING YOURSELF
still, who cares what speed youre doing... you're too busy SHITTING YOURSELF
26-12-2006, 06:20 PM
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Originally Posted by Jim Galbally
mine's GPS accurate at 100, and 2mph out at 120, so i dont think the clocks are that far out at speed.
still, who cares what speed youre doing... you're too busy SHITTING YOURSELF
still, who cares what speed youre doing... you're too busy SHITTING YOURSELF
26-12-2006, 06:34 PM
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Originally Posted by Ginge !
Originally Posted by Jim Galbally
mine's GPS accurate at 100, and 2mph out at 120, so i dont think the clocks are that far out at speed.
still, who cares what speed youre doing... you're too busy SHITTING YOURSELF
still, who cares what speed youre doing... you're too busy SHITTING YOURSELF
26-12-2006, 07:46 PM
#18
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Top speed can be worked out from peak power, drag coefficient and frontal area. Mass doesn't affect top speed, it will just affect how long it takes to get there. Wind resistance and rolling resistance will affect it in real terms as they're in effect increasing drag. Also alot of car may hit top speed on 4th but not 5th due to the gear ratios.
26-12-2006, 10:40 PM
#21
Originally Posted by lawnsy
Originally Posted by Ginge !
Originally Posted by Jim Galbally
mine's GPS accurate at 100, and 2mph out at 120, so i dont think the clocks are that far out at speed.
still, who cares what speed youre doing... you're too busy SHITTING YOURSELF
still, who cares what speed youre doing... you're too busy SHITTING YOURSELF
26-12-2006, 10:47 PM
#22
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