Discussion
Neil1300R said:
Something doesn't add up - to do fast 0-100KM/H you need lots of revs right from the start - car would never be below 4000rpm during a run so exhaust valves open all the time.
Would go and run my own tests but wouldn't be able to put up with the smell of the clutch being abused!
Neil, this was questioned and it's pretty simple really as the test wasn't to do a 'fast 0-100kph' but simply to run from idle to 100kph or, as he put it, 'a granddad start'. Once you're through the 4k revs it makes no difference, valve open anyway. Unless you drive it like you stole it, i.e. drive everywhere with in excess of 4k revs, ironically, you are more likely to notice the difference in every day driving.Would go and run my own tests but wouldn't be able to put up with the smell of the clutch being abused!
dising their steering column is fine by me Steve*B said:
Neil1300R said:
Something doesn't add up - to do fast 0-100KM/H you need lots of revs right from the start - car would never be below 4000rpm during a run so exhaust valves open all the time.
Would go and run my own tests but wouldn't be able to put up with the smell of the clutch being abused!
Neil, this was questioned and it's pretty simple really as the test wasn't to do a 'fast 0-100kph' but simply to run from idle to 100kph or, as he put it, 'a granddad start'. Once you're through the 4k revs it makes no difference, valve open anyway. Unless you drive it like you stole it, i.e. drive everywhere with in excess of 4k revs, ironically, you are more likely to notice the difference in every day driving.Would go and run my own tests but wouldn't be able to put up with the smell of the clutch being abused!
Don't care if Fuse 22 does make a bit more torque, just questioning bad 'science'
Ooh, and I am with Murph - £300 for a switch!
Steve*B said:
300 quid for bragging rights is cheap, even for northerners 
I've not been South long enough for that sort of thing to hold true 
Anyway, we've already worked out you're turning into an old fart. I'm surprised you don't need the valve open all the time to know the engine's on
Neil1300R said:
)
Ooh, and I am with Murph - £300 for a switch!
It's not for a switch Neil, it's for an apparent, and convenient, extra 20Nm of Torque when you want it Ooh, and I am with Murph - £300 for a switch!
I haven't done the test 'scientifically' either but, as previously mentioned, the difference is noticeable and not just by me so I really can't add anything other than that. Perhaps those that have been uncorked from new might want to give it a week with fuse back in and report back?
Guys, Fully concur 5 sec not possible without a launch start.
my own observations (also on AMOC):
"Well, after a long while without fuse 22, I stuck it back in (just bored I guess) and noticed some differences in acceleration behaviour. Intrigued, I proceed to switch back and forth with/without fuse 22 for another week.
My observations are that there is indeed a loss of torque below 4K rpm, but only while short-shifting under hard acceleration. I.e., if you fully depress the accelerator, but then shift at 5K - meaning that you start in the next gear at, say, 3K, then there is a noticeable lack of response in the higher gear if fuse 22 is out, compared to if it is in place. It feels like the engine is out of breath and takes a moment longer to recover.
On the other hand is you are cruising at, say, a steady 3K, and then accelerate hard - it makes no difference either way.There is no such loss of response.
I suppose at some level this makes sense. Leaving the fuse in allows for enough back pressure allowing for better volumetric fill in a situation when the valave/intake timing has just been set to full open (accelerating to 5K).
But since one would rarely short-shift while accelerating hard, this situation rarely arises. So, just like most of you, I will happily stay with fuse 22 removed."
my own observations (also on AMOC):
"Well, after a long while without fuse 22, I stuck it back in (just bored I guess) and noticed some differences in acceleration behaviour. Intrigued, I proceed to switch back and forth with/without fuse 22 for another week.
My observations are that there is indeed a loss of torque below 4K rpm, but only while short-shifting under hard acceleration. I.e., if you fully depress the accelerator, but then shift at 5K - meaning that you start in the next gear at, say, 3K, then there is a noticeable lack of response in the higher gear if fuse 22 is out, compared to if it is in place. It feels like the engine is out of breath and takes a moment longer to recover.
On the other hand is you are cruising at, say, a steady 3K, and then accelerate hard - it makes no difference either way.There is no such loss of response.
I suppose at some level this makes sense. Leaving the fuse in allows for enough back pressure allowing for better volumetric fill in a situation when the valave/intake timing has just been set to full open (accelerating to 5K).
But since one would rarely short-shift while accelerating hard, this situation rarely arises. So, just like most of you, I will happily stay with fuse 22 removed."
here is something i posted ages ago http://www.derbymotorservices.com/faq/questions/3/...
Steve*B said:
...
Murph, I'll do you a deal on it.
You give me 50 quid, I'll take it off you Murph, I'll do you a deal on it.
Anyway, quit messing about waiting for the Aston badged exhaust. Just get a Tubi! You can always tell people the switch is for the ejector seat. Or a cloaking device against tight arsed Northern monkeys!
Murph7355 said:
Steve*B said:
...
Or a cloaking device against tight arsed Northern monkeys!
Well I did read somewhere that Aston drivers who remove fuse 22 are the type of owners who watch petrol prices. Didn't make sense at the time but the penny's just dropped! Or a cloaking device against tight arsed Northern monkeys!
Standard set up (fuse in) = higher revs for exhaust valve opening = higher fuel consumption for the desired aural pleasure.
Conclusion. You're watching fuel prices
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