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Home > Technical Chat > 3.7 or 3.9 Final Drive choice ? | |||||||
1434 Posts Member #: 8466 Post Whore Mansfield |
5th Mar, 2016 at 03:15:42pm
Hi guys,
Class C 3rd Place Avon 2011 14.18 @101mph |
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9258 Posts Member #: 123 Post Whore Betwix Harrogate and York |
5th Mar, 2016 at 03:36:31pm
For circuit use I'd be using a 3.4 with that size motor.
Fastest 998 mini in the world? 13.05 1/4 mile 106mph
On 2nd Jan, 2013 fastcarl said:
the design shows a distinct lack of imagination, talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry. |
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1434 Posts Member #: 8466 Post Whore Mansfield |
5th Mar, 2016 at 03:52:57pm
It's not turbo though Will. Is 7 Port N/A 300degree cam. 4-7500rpm power band. Plus the Dogbox gearing will need at least a 3.7 to pull off the line. Edited by alaskanow0 on 5th Mar, 2016. Class C 3rd Place Avon 2011 14.18 @101mph |
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3074 Posts Member #: 1348 Post Whore wakefield West Yorks |
5th Mar, 2016 at 05:46:53pm
3.7 at least if not 3.4 |
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3074 Posts Member #: 1348 Post Whore wakefield West Yorks |
5th Mar, 2016 at 05:50:21pm
I'm sure your calcs will be better than mine but if I remember correct my 3.7 was way too short , I was going over the line at York drag way on the rev limiter at 7k at 93-94 mph !! That was on 12" wheels |
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1434 Posts Member #: 8466 Post Whore Mansfield |
5th Mar, 2016 at 06:43:57pm
My 1380 miglia spec engine was about 95mph at 7k on 10's and that had a 4.2FD but it revved to 8.5k.
Class C 3rd Place Avon 2011 14.18 @101mph |
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9258 Posts Member #: 123 Post Whore Betwix Harrogate and York |
5th Mar, 2016 at 06:57:35pm
Well a diff isn't that difficult to change. So if you go with the 3.7 then you'll be able to gauge it eitehr way and only need to change it once.
Fastest 998 mini in the world? 13.05 1/4 mile 106mph
On 2nd Jan, 2013 fastcarl said:
the design shows a distinct lack of imagination, talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry. |
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1434 Posts Member #: 8466 Post Whore Mansfield |
5th Mar, 2016 at 07:23:32pm
On 5th Mar, 2016 wil_h said:
Well a diff isn't that difficult to change. So if you go with the 3.7 then you'll be able to gauge it eitehr way and only need to change it once. At least with the 3.7 you could go hillclimbing as well.. Sorry ignore my ignorance why a 3.7 for hill climbing? Edited by alaskanow0 on 6th Mar, 2016. Class C 3rd Place Avon 2011 14.18 @101mph |
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9258 Posts Member #: 123 Post Whore Betwix Harrogate and York |
5th Mar, 2016 at 07:31:48pm
The 3.4 would be too tall for hillclimbing, especially as you need to do an emergency start every run. Fastest 998 mini in the world? 13.05 1/4 mile 106mph
On 2nd Jan, 2013 fastcarl said:
the design shows a distinct lack of imagination, talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry. |
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2974 Posts Member #: 10749 Post Whore lowestoft suffolk |
5th Mar, 2016 at 08:59:47pm
Amuse my ignorance... emergency start?? On 24th Oct, 2015 jonny f said:
Nothing gets past Dave lol NOTHING GETS PAST ME!! 1/4 mile 14.7 @ 96mph 12psi boost Showdown class A 2nd place 18.6 @ 69mph |
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2742 Posts Member #: 637 Post Whore Hertfordshire |
5th Mar, 2016 at 09:56:25pm
O
On 5th Mar, 2016 D4VE said:
Amuse my ignorance... emergency start?? Opposite to a emergency stop! Lol My build thread..
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684 Posts Member #: 9590 Post Whore Derby |
6th Mar, 2016 at 08:07:18am
I ran a 3.7 in mine and I found it good all round. Matt W
On 14th Mar, 2012 mw3 said:
Got a nice big delivery from Carl at Force Racing today. |
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4304 Posts Member #: 1321 Post Whore Wiltshire |
6th Mar, 2016 at 08:35:11am
I vote 3.7 with that rev limit On 7th Oct, 2010 5haneJ said:
yeah I gave it all a good prodding |
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1434 Posts Member #: 8466 Post Whore Mansfield |
6th Mar, 2016 at 08:42:24pm
Thanks guys. I guess the real question should have been 'what speed can you get up to on a track day' and I guess the answer is depending on which track.
Class C 3rd Place Avon 2011 14.18 @101mph |
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2974 Posts Member #: 10749 Post Whore lowestoft suffolk |
6th Mar, 2016 at 09:17:06pm
Low 14 at best?
On 24th Oct, 2015 jonny f said:
Nothing gets past Dave lol NOTHING GETS PAST ME!! 1/4 mile 14.7 @ 96mph 12psi boost Showdown class A 2nd place 18.6 @ 69mph |
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1434 Posts Member #: 8466 Post Whore Mansfield |
6th Mar, 2016 at 11:33:31pm
On 6th Mar, 2016 D4VE said:
Low 14 at best? Hadnt this car in heavier mode already done that n/a? Yes 13.91 at 560kg, but that was using nitrous. It only managed a 14.6 without. I don't fancy running nitrous again after it killed my engine on the Sunday at Shakedphere after a 60bhp shot trying to beat Rich1380 for 2nd place. Class C 3rd Place Avon 2011 14.18 @101mph |
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1434 Posts Member #: 8466 Post Whore Mansfield |
6th Mar, 2016 at 11:37:04pm
A 13sec quarter from a NA is a major challenge. There's only Paul W & Rich1380 done it without cheating gas I think. Class C 3rd Place Avon 2011 14.18 @101mph |
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76 Posts Member #: 9169 Advanced Member Cape Town, South Africa |
7th Mar, 2016 at 05:41:39am
How about a 3.7 and a set of MS SC drop gears? Then a simple swap of primary gear you can effectively change your diff ratio between 3,6 ; 3,7 ; 3,9 |
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1434 Posts Member #: 8466 Post Whore Mansfield |
7th Mar, 2016 at 09:10:07am
On 7th Mar, 2016 dion said:
How about a 3.7 and a set of MS SC drop gears? Then a simple swap of primary gear you can effectively change your diff ratio between 3,6 ; 3,7 ; 3,9 That's a good idea. Class C 3rd Place Avon 2011 14.18 @101mph |
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1434 Posts Member #: 8466 Post Whore Mansfield |
7th Mar, 2016 at 09:43:11pm
3.7 ordered Class C 3rd Place Avon 2011 14.18 @101mph |
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