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 399 Posts Member #: 793 Senior Member Milton Keynes |
25th Jul, 2006 at 03:12:35pm
When running a turbo motor, what are the deciding factors when choosing a diff! Is it true that a combination of high torque and low revs would point to a diff selection quite low ie: 3.4 for 10" wheels and 3.7 for 13" wheels http://i28.photobucket.com/albums/c248/spe...er1/mini007.jpg
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Site Admin  15300 Posts Member #: 337 Fearless Tom Fenton, Avon Park 2007 & 2008 class D winner & TM legend. |
25th Jul, 2006 at 03:16:38pm
As always with diff ratios there is no "right" answer, different people favour different approaches.
On 29th Nov, 2016 madmk1 said:
On 28th Nov, 2016 Rob Gavin said:
I refuse to pay for anything else Like fuel 😂😂 |
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5795 Posts Member #: 80 AFRacing LTD Newbury, Berks |
25th Jul, 2006 at 03:58:43pm
Slighty longer than for a NA seems good... you have buckets more torque all the way with a turbo, coupled with the fact you don't need to rev the knackers off them to get the performance.
AlexF |
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 8215 Posts Member #: 90 Post Whore Somewhere around Swindon |
25th Jul, 2006 at 04:08:06pm
i will never ever run 13"s again with a turbo regardless off diff Crystal Sound Audio said:
Why wolfie...you should have your name as Fuckfaceshithead ! "A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools."-Douglas Adams |
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 982 Posts Member #: 97 Post Whore Near Daventry, midlands |
25th Jul, 2006 at 04:13:36pm
On 25/07/2006 16:08:06 wolfie said:
i will never ever run 13"s again with a turbo regardless off diff Why? Not a criticsm, just wondering? I've gone from 12-13-10 and i have to admit there aint much in it performance wise with an optamised setup on each (i.e not the same) I've seen the future and tbh its Pie
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5795 Posts Member #: 80 AFRacing LTD Newbury, Berks |
25th Jul, 2006 at 05:21:34pm
no?!?!
AlexF |
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8215 Posts Member #: 90 Post Whore Somewhere around Swindon |
25th Jul, 2006 at 05:40:14pm
had stupid amounts of torque steer, and 10's look better Crystal Sound Audio said:
Why wolfie...you should have your name as Fuckfaceshithead ! "A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools."-Douglas Adams |
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 11046 Posts Member #: 965 Post Whore Preston On The Brook |
25th Jul, 2006 at 05:49:43pm
Almost the same foot print, 10's 12's 13's so where does the torque steer come from? On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be... So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'... On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........ |
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982 Posts Member #: 97 Post Whore Near Daventry, midlands |
25th Jul, 2006 at 05:50:09pm
On 25/07/2006 17:40:14 wolfie said:
and 10's look better  that be true :cool: I've seen the future and tbh its Pie
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Site Admin  9407 Posts Member #: 58 455bhp per ton 12 sec 1/4 mile road legal mini Sunny Bridgend, South Wales |
25th Jul, 2006 at 06:44:54pm
On 25/07/2006 17:40:14 wolfie said:
had stupid amounts of torque steer, and 10's look better I also found the same, although ym old 13's did hav a deep offset which didn't help. On 15th May, 2009 TurboDave said:
I think the welsh one has it right! 1st to provide running proof of turbo twinkie in a car and first to run a 1/4 in one!! Is your data backed up?? one extra month free for all Turbo minis members, PM me for detials |
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8215 Posts Member #: 90 Post Whore Somewhere around Swindon |
25th Jul, 2006 at 07:40:28pm
On 25/07/2006 18:44:54 Jimster said:
I also found the same, although my old 13's did have a deep offset which didn't help. same as me jim Crystal Sound Audio said:
Why wolfie...you should have your name as Fuckfaceshithead ! "A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools."-Douglas Adams |
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 1745 Posts Member #: 375 Post Whore Leicestershire |
25th Jul, 2006 at 08:08:28pm
I think the ride is a lot better on my tens compared to my thirteens think this must be due to the tyre profile acting as a suspension!
Edited by Star Mag on 25th Jul, 2006. |
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Site Admin  8506 Posts Member #: 16 Sold the turbo and seeing what the C20XE can do! Near Lincoln |
25th Jul, 2006 at 08:16:10pm
think i'm on a 3.9. whatever the migs run.
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982 Posts Member #: 97 Post Whore Near Daventry, midlands |
25th Jul, 2006 at 08:26:27pm
On 25/07/2006 18:44:54 Jimster said:
On 25/07/2006 17:40:14 wolfie said:
had stupid amounts of torque steer, and 10's look better I also found the same, although ym old 13's did hav a deep offset which didn't help. I didnt, maybe thats the difference, or maybe its because i only had 85bhpish 
I've seen the future and tbh its Pie
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 725 Posts Member #: 177 Avon Park 2006 Class D Winner Woburn Sands |
25th Jul, 2006 at 08:31:16pm
3.1 on 10s I found to be the best for me 16V project underway |
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1425 Posts Member #: 690 Post Whore Norfolk |
25th Jul, 2006 at 09:18:35pm
Gavin - diff needs to match the torque curve and rpm capability of the engine, hence big torque low rev turbo motors (6500ish) wouldn't perform best on a 3.9 diff and 10's, whereas peaky n/a motors with powerbands 4-8k would perform well with 3.9 diff and 10's - its all about maximising thrust at the wheels v road speed. If Carling made Mini engines
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1425 Posts Member #: 690 Post Whore Norfolk |
25th Jul, 2006 at 09:21:42pm
Gavin - send me your torque curve/ gear ratios and I'll do a gear cascade diagram for your car - may even overlay my K1100 one onto it as well for comparison!!!!! If Carling made Mini engines
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 9812 Posts Member #: 332 Resident Cylinder Head Modifier Mitsi Evo 7, 911, Cossie. & all the chavs ...... won no problem |
25th Jul, 2006 at 11:23:16pm
well i run a challenge gearset
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 9258 Posts Member #: 123 Post Whore Betwix Harrogate and York |
26th Jul, 2006 at 07:12:30am
Well I run a 4.1 on 13", so stick that in your pipe and eat it.
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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Site Admin 8506 Posts Member #: 16 Sold the turbo and seeing what the C20XE can do! Near Lincoln |
26th Jul, 2006 at 07:16:28am
so my 3.9 might not be too bad then. cool!
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1425 Posts Member #: 690 Post Whore Norfolk |
26th Jul, 2006 at 09:00:13am
Gavin - before we get too excited whats the spec of the turbo motor and whats it too be used for?
If Carling made Mini engines
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 9326 Posts Member #: 59 First mini turbo to get in the 12's & site perv Herefordshire |
26th Jul, 2006 at 04:33:56pm
are you using a lsd?
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 255 Posts Member #: 520 Senior Member nr hull |
26th Jul, 2006 at 05:30:49pm
im running a 3.9cwp on an lsd and tbh i found it ran out of legs on the strip. i was hitting 6500ish rpm before i hit the 1/4 and it just wouldnt pull any more. thats on a kent 266 cam, pretty well spec'd 1380 turbo on 10's. it might have found a bit more on the top end if it was set up properly but i didnt have time or money to get it sorted before avon. it felt like i hit a brick wall tbh and i noticed when i got it back that i never updated my megajolt map to take on the higher rpm limit. my map only goes up to 6k revs, although i dont know if that will have any efect on anything, or if it will just hit the max advance and hold it?
doh! why did i start messing with it!
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Site Admin 9407 Posts Member #: 58 455bhp per ton 12 sec 1/4 mile road legal mini Sunny Bridgend, South Wales |
26th Jul, 2006 at 06:08:49pm
I have a 3.44 with my LSD On 15th May, 2009 TurboDave said:
I think the welsh one has it right! 1st to provide running proof of turbo twinkie in a car and first to run a 1/4 in one!! Is your data backed up?? one extra month free for all Turbo minis members, PM me for detials |
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9326 Posts Member #: 59 First mini turbo to get in the 12's & site perv Herefordshire |
26th Jul, 2006 at 10:16:14pm
how did you do that? is it one of carls modded ones |
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