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Author will tuning an engine
Cole
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Registered: 11th Nov 02
Location: eastbourne Drives:zafira sold now a qashqai
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20th Oct 03 at 08:58   View User's Profile U2U Member Reply With Quote

my god a decent convo very interesting
Cybermonkey
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Registered: 22nd Sep 02
Location: Sydney, Australia
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20th Oct 03 at 09:13   View User's Profile U2U Member Reply With Quote

of course Cole. The power band ends below 6kRPM though Daimo, and you are not gaining anything on a standard engine by revving the nuts off it. Much better to change at about 5000-5500 rpm
Richie
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Registered: 3rd Dec 02
Location: Newport, Wales
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20th Oct 03 at 10:09   View User's Profile U2U Member Reply With Quote

up for vibs to respond
l33t corsa
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Registered: 14th Aug 01
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20th Oct 03 at 10:20   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by Cybermonkey24
of course Cole. The power band ends below 6kRPM though Daimo, and you are not gaining anything on a standard engine by revving the nuts off it. Much better to change at about 5000-5500 rpm


You have the advantage of keeping it a lower gear. You'd need to work out thrust figures or whatever they're called to see when it was best to change gear. More than likely there is an advantage to holding a lower gear longer. They have the graphs in some bike magazines if you don't know what I'm on about.
Adam
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Registered: 1st May 01
Location: Hurstbourne Tarrant
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20th Oct 03 at 10:28   View User's Profile U2U Member Reply With Quote

that'll be peak bhp at 5500, peak torque should be lover thyan that about the 3-4k mark

[Edited on 20-10-2003 by Adam]
vibrio
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Registered: 28th Feb 01
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20th Oct 03 at 10:35   View User's Profile U2U Member Reply With Quote



a cars topspeed is dependant on power,the gear ratios and weight amounst other things etc etc.


my car's (standard) topspeed is 124mph but that is not at the rev limit in 5th gear. I now have a limit of 7200 which if I had the power the car would do 163mph on the limiter. if the car has been modified a lot and has huge increase in power then it would be possible to hit the limiter in top gear ( I did this in my sporting) so yes in situation a raised limiter would increase the top speed. however most cars never get to that stage of tunning.
Andy
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Registered: 28th Dec 99
Location: Cumbria, UK
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20th Oct 03 at 10:47   View User's Profile U2U Member Reply With Quote

You should change gear at peak power rpm (or slightly over), not at peak torque. Although you may have more engine torque slightly lower down the rev range, don't forget that gearing at high revs can convert a slightly lower engine torque figure into more torque at the wheels. This is most effective at around peak bhp rpm. The same is true of reaching top speed (assuming your rev limiter is set high enough so it won't cut in in top gear) You really need to look at a power/torque curve to decide the best place to change gear for max acceleration
Kris TD
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Registered: 25th Mar 02
Location: Ware, Hertfordshire
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20th Oct 03 at 10:57   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by Cybermonkey24
of course Cole. The power band ends below 6kRPM though Daimo, and you are not gaining anything on a standard engine by revving the nuts off it. Much better to change at about 5000-5500 rpm


wont the 1.6 have a lower peak power than daimos old 1.4 anyway?
Marc
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Registered: 11th Aug 02
Location: York
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20th Oct 03 at 11:08   View User's Profile U2U Member Reply With Quote

i always change gear slightly over peak power (as andy sez) so when im changin im not losin potential power.
Daimo B
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Registered: 20th Mar 00
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20th Oct 03 at 11:22   View User's Profile U2U Member Reply With Quote

Same as. Wity my current engine i change at 6500rpm. It pulls all the way up from about 3k, but i can hear and feel the engine struggling after 6500rpm so change.

Another reason as to why i want to get my car on the rollers.
stuyw
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Registered: 15th May 02
Location: North West Drives: Rev3 MR2 Turbo
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20th Oct 03 at 11:53   View User's Profile U2U Member Reply With Quote

u get more than 130 mph with a F15 m8
Daimo B
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Registered: 20th Mar 00
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20th Oct 03 at 12:01   View User's Profile U2U Member Reply With Quote

Noo, we were saying about 130mph @ 6500rpm on a standard F15 box.

I've got an F20. Much better box than my F13 was.
stuyw
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Registered: 15th May 02
Location: North West Drives: Rev3 MR2 Turbo
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20th Oct 03 at 12:06   View User's Profile U2U Member Reply With Quote

ah sorry m8, read it wrong
i had an F20 with my engine, but swapped it for the F16 instead
Daimo B
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Registered: 20th Mar 00
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20th Oct 03 at 12:07   View User's Profile U2U Member Reply With Quote

Fads just done that too.

Im not too arsed tbh. My cars as quick as it is, and at the mo, i've no intention to make it any faster (yet). Wanna make it look pretty and shiny before that.

Plus all engine mods are always bloody expensive I've got coilovers to save for first
Sooty
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Registered: 9th Mar 03
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20th Oct 03 at 12:16   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by Daimo B
Wanna make it look pretty and shiny before that.


you getting a new car? j/k could'nt resist
vibrio
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Registered: 28th Feb 01
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20th Oct 03 at 12:23   View User's Profile U2U Member Reply With Quote


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