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Author: Subject: BEC top speed? In order to work out gear ratio
woodsy144

posted on 27/11/19 at 12:51 PM Reply With Quote
BEC top speed? In order to work out gear ratio

Hello, I'm am now trying to figure out final drive. Being chain driven I can pick and choose. Build a sprocket to suit
What works well for a R1 powered car?
If you know the stop speed, I can work back to match.
Any help would be great.
I was current thinking of about 210km/h.
Note thing must be drivable in traffic.

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BenB

posted on 27/11/19 at 02:01 PM Reply With Quote
Presumably it depends on the aerodynamics of the car. I would imagine most Locost style cars hit an aerodynamic brick wall well before 130mph.
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ian locostzx9rc2

posted on 27/11/19 at 05:29 PM Reply With Quote
130 mph would be about right I had a striker with a Kawasaki zx9r it was geared to be flat out at 124mph never had an issue getting there wasn’t the lightest striker and it had a full windscreen .

[Edited on 27/11/19 by ian locostzx9rc2]

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snapper

posted on 27/11/19 at 06:14 PM Reply With Quote
What bhp is the r1 engine?
I was told by Andy Bates that a 7 would do about 110 to 115mph but a full body car like a Fury would do near 130 with the same setup





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SPYDER

posted on 27/11/19 at 06:32 PM Reply With Quote
This BEC gear calculator might be useful...





CLICK HERE



Or Google "BEC GEAR CALCULATOR" Lots available.

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Kev99

posted on 27/11/19 at 06:35 PM Reply With Quote
Mk Indy 2008 R1 4c8 engine, About 125 mph top speed
Quick up to 115 mph then starts to takes a little more time as u would expect, 3:62 diff 13 in wheels hope this info helps

Kev......

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Jon Ison

posted on 27/11/19 at 07:26 PM Reply With Quote
Hit limiter in top around 142/3 gps.
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procomp

posted on 27/11/19 at 09:12 PM Reply With Quote
As Jon says. If its a pure track car The RGB rear engine cars ( AERO ) hit 145mph, the front engine cars hit 135mph using 1000cc
If road and occasional trackday, gear for 125 mph youll be fine.

Cheers Matt

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woodsy144

posted on 27/11/19 at 10:01 PM Reply With Quote
Thanks guys, i will target 125mph
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TimC

posted on 28/11/19 at 11:21 PM Reply With Quote
quote:
Originally posted by Kev99
Mk Indy 2008 R1 4c8 engine, About 125 mph top speed
Quick up to 115 mph then starts to takes a little more time as u would expect, 3:62 diff 13 in wheels hope this info helps

Kev......


That is so interesting. Full body is worth 10mph then.






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steve m

posted on 29/11/19 at 09:06 AM Reply With Quote
I was under the impression that some more questions would be needed, like
what is the car going to be used for ?
as if its a track only car, top end speed is a requirement,
but a road only car, top end is worth nothing, as acceleration is needed more

You cant have top end speed and acceleration using just one setup

I will also agree that any 7 style of car will feel like a brick at a certain speed,
My deceased 7<< hit that wall at about 100, it was just like having the brakes dragging above that

steve





Thats was probably spelt wrong, or had some grammer, that the "grammer police have to have a moan at




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