Acceleration

[marcus1970]

Any info much appreciated...

How does the cerb stop its driver planting the accelerator through the floor. I know there's a rev limiter as I've hit this quite a few times, but on other cars there is usually a back stop that won't let you press the pedal down any further even if you've got legs like the hulk.

If I kept pressing the accelerator down and the rev limiter wasn't working would the engine explode as the revs went off the scale?

The reason I ask is that I have quite a bit of play in the pedal and arm and was lying on my back this afternoon having a nose round. I noticed the crudity of the set up ie wobbly arm connected to cable shoved through plastic gromett then a rubber one that looks on its last legs and finally into a black sleeve - it is crude to say the least or have I got bits missing?

Cheers

MB

[copilot]

Question nothing, accept everything (unless the brake and accelerator are back to front..which is possible)and smile. It's a TVR, 100% TVR... simple really.

[itsallyellow]

And yes they can rev to detruction! I believe this is what happened to one of jhonyw's engines.
mike

[trackcar]

there is no rev limiter in the ecu .. the only safeguards are a shift light/beeper and two rows of fuelling taken out at high revs .. but it's fuelled again after that so if you happen to get past that two rows you'll rev to destruuction .. the ajp8 seems safe to at least 8k revs in short bursts though, so you'd have to go some to blow one up or be very slow on the kill button if your throttle jammed ..

[southendpier]

8000 crickey, I wouldn't fancy that! The vibration and noise must be phenominal.

[HarryW]

trackcar said:

there is no rev limiter in the ecu .. the only safeguards are a shift light/beeper and two rows of fuelling taken out at high revs .. but it's fuelled again after that so if you happen to get past that two rows you'll rev to destruuction .. the ajp8 seems safe to at least 8k revs in short bursts though, so you'd have to go some to blow one up or be very slow on the kill button if your throttle jammed ..

When you remap do you not empty the load cells above 8k?

[ridds]

Benefit of the harmonics of a flat plane crank.

Don't try it in a Rover V8. :lol

[KEET]

Have seen over 9k on a PI system on a Tuscan challenge car fitted with the AJP!

[HarryW]

KEET said:

Have seen over 9k on a PI system on a Tuscan challenge car fitted with the AJP!

I've heard of 10.5k but the valves hit the pistons, particularly when coming off the power change down .

[RUSSELLM]

Slightly O/T, but I had a Caterham not far behind me recently, and as I was reaching the high end of fourth gear with him holding his own, his engine let go in spectacular fashion.

I felt gutted for him, obviously an enthusiast.

[work-shy-wanabe]

No rev limiter? I didnt know that, thanks.

[whatever]

southendpier said:

8000 crickey, I wouldn't fancy that! The vibration and noise must be phenominal.

yeah - phenominal in a good way (with someone else's engine, anyway!)

Anyway, the shift light and buzzer are a bit redundant at that sort of revs. The *whole car's telling you* it's time to change up!

[TT Tim]

When the throttles stick open and it over revs, this is what happens to your pistons!



This was taken from JonnyW's engine after a very bad day at Goodwood!

Tim

[ridds]

Max revs is mainly governed by the mass of the engine and the quality of the valve train.

Heavy pistons and a badly balanced crank will keep your peak speed down.

Also, too soft springs on the valves and weak hydraulic tappets will also lower your upper limit.

However, up the spring rates and you up the valve train loading and thus increase wear.