Well since getting my R1 Indy road legal, my biggest problem has been starting without stalling!

I have now adjusted the clutch pedal, so there is a lot more feel, which has made things a lot better, but I'm struggling to get "quick" launches.

The only way I'm getting consistent starts without stalling is by giving it a couple of revs, slowly release the clutch a bit, then once it starts to roll, give it some more revs, and release the clutch fully.

I've tried giving it more revs (around 5k) and letting the clutch out quickly, but it just seems to stall.

So what is the usual way of getting a BEC moving quickly?

Cheers

quote:

---

Originally posted by -matt
Well since getting my R1 Indy road legal, my biggest problem has been starting without stalling!

I have now adjusted the clutch pedal, so there is a lot more feel, which has made things a lot better, but I'm struggling to get "quick" launches.

The only way I'm getting consistent starts without stalling is by giving it a couple of revs, slowly release the clutch a bit, then once it starts to roll, give it some more revs, and release the clutch fully.

I've tried giving it more revs (around 5k) and letting the clutch out quickly, but it just seems to stall.

So what is the usual way of getting a BEC moving quickly?

Cheers

---

"The only way I'm getting consistent starts without stalling is by giving it a couple of revs, slowly release the clutch a bit, then once it starts to roll, give it some more revs, and release the clutch fully. "

Couple of revs is not enough, more reves but same technique :-)

ah ok, looks like more revs is it then

im not quite used to this high revving thing yet, keep thinking I'm about to blow the bloody thing up

Will have another play tomorrow, if i get 2 mins when it doesn't rain!

Cheers

I was the same in my BEC. Easy for civilised starts but when doing fast start they need revs .

Think about it. In a normal car you would be sitting about about 2/3 of full revs or about 4nish.
BEC is the same. About 7k!!

Bring the revs up until you think "Jesus this cant be right" ,sidestep the clutch. And enjoy the ride

Yep as above more revs, for a race start, its more like 10,000 when motor revs to 13k.

2000 to 3000 revs as sonn as it starts to bite off you go you can slip bike clutches quite alot never had a problem with my zx9r striker made my pedal ratio approx 4 to 1 if that helps..

More beans my friend, more beans :-)

Then it won't stall but don't do it in the wet or wellllll you will find out like I did when I rented a bec.

Rev limiter....

http://www.kewego.co.uk/video/iLyROoafYqXZ.html

But not in the wet ! http://www.kewego.co.uk/video/iLyROoaftKbj.html (Those are the Grand National jumps on the outside of the track and they are huge!!

[Edited on 20/11/12 by lsdweb]

" Think about it. In a normal car you would be sitting about about 2/3 of full revs or about 4nish. "

You're kidding

2 K is ample. I bet Mr Clutch loves you

On my ST1100 engined Locost the engine bogs a bit because the carbs take a while to adjust. So it was always 7k (out of the 8.5) and dump the clutch.

In contrast to what pretty much everyone here is saying, in the beginning I actually found the easiest way to get going was to not touch the throttle at all.

I found that the engine was way less prone to stalling when left on idle. Perhaps the engine's idle mode acts like an anti stall or something, but I found that much easier than giving it 3-4k revs.

I still use that technique a lot as I find it the "safest" and most convenient way to get going without stalling, and can actually be done in a somewhat reasonable pace. However after driving the car for 3.000 miles now I've become somewhat decent at making just plain starts with 3-4k revs as well, though they're way trickier.

Starting up hill though is still out of the question without reving 10k and dumping the clutch.

The car is a MK Indy with a 2003 R1 5PW engine.

quote:

---

Originally posted by xtimmyx
In contrast to what pretty much everyone here is saying, in the beginning I actually found the easiest way to get going was to not touch the throttle at all.

I found that the engine was way less prone to stalling when left on idle. Perhaps the engine's idle mode acts like an anti stall or something, but I found that much easier than giving it 3-4k revs.

I still use that technique a lot as I find it the "safest" and most convenient way to get going without stalling, and can actually be done in a somewhat reasonable pace. However after driving the car for 3.000 miles now I've become somewhat decent at making just plain starts with 3-4k revs as well, though they're way trickier.

Starting up hill though is still out of the question without reving 10k and dumping the clutch.

The car is a MK Indy with a 2003 R1 5PW engine.

---

A bike engine doesn't have nearly as much torque as a car engine, having such a small flywheel amongst other things. Remember that power is proportional to torque X rpm. As such, you need to give it a lot of revs to launch like most people are saying. I used to race FSAE cars which use a bike engine and we used to launch anywhere from 6500 to 9000 depending on the setup of the car/engine.

Cheers all, I seem to have mastered this quite well now. About 4k revs and slowly release the clutch seems to work a treat.

I haven't done any 9k rev starts as mentioned, as the road has been so wet and damp, and I'm too scared as to how the car will react when the rears start to spin from a standstill.

I scared the crap out of myself the other day going up a hill at about 40mph, in 3rd gear, gave it a bit of throttle, and the rear lost grip and started drifting towards oncoming traffic for a few seconds, before it found traction.

quote:

---

Originally posted by -matt
Cheers all, I seem to have mastered this quite well now. About 4k revs and slowly release the clutch seems to work a treat.

I haven't done any 9k rev starts as mentioned, as the road has been so wet and damp, and I'm too scared as to how the car will react when the rears start to spin from a standstill.

I scared the crap out of myself the other day going up a hill at about 40mph, in 3rd gear, gave it a bit of throttle, and the rear lost grip and started drifting towards oncoming traffic for a few seconds, before it found traction.

---

quote:

---

Originally posted by Macbeast
" Think about it. In a normal car you would be sitting about about 2/3 of full revs or about 4nish. "

You're kidding

2 K is ample. I bet Mr Clutch loves you

---

quote:

---

You're kidding 2 K is ample. I bet Mr Clutch loves you

---