rgrigsby Posted January 13, 2008 Share Posted January 13, 2008 I know there's been a lot of discussion about the best gearbox/diff combination for a Duratec I just thought it might be intersting to get a thread with a summary of what people have ended up with for comparison purposes. I'll start with mine RaceCo 2.3l Duratec approx 260bhp/200lbft BGH Sporting close 5 speed 2.66 1st 0.86 5th 3.92 ZF Plate type diff 13*205/55 CR500's on the rear Anyone else out there? 😬 Cheers Rob G www.SpeedySeven.com Edited by - rgrigsby on 13 Jan 2008 15:37:07 Link to comment Share on other sites More sharing options...
timbo Posted January 13, 2008 Share Posted January 13, 2008 RaceCo component 2.0l Duratec approx 230bhp Caterham 6 speed 3.38 diff 9x 15" rims @ rear BUSA POWWWER Link to comment Share on other sites More sharing options...
simonbell Posted January 13, 2008 Share Posted January 13, 2008 2.0 duratec 185bhp BGH Pro Road and Track with alloy main case Ratios - 1st (2.66:1), 2nd (1.75:1), 3rd (1.21:1), 4th (1.00:1), 5th (0.86:1) Std diff 3.92:1 13" wheels , 205/60 tyres on the rear Seems to work well although interested to try Timbo's setup as a comparison although definitely not convinced this engine warrants a 6 speed. Simon Bell - Caterham 7 Duratec R I`ve seen the future.....and it`s powered by duratec Check out the website here Link to comment Share on other sites More sharing options...
dannylt Posted January 14, 2008 Share Posted January 14, 2008 RaceCo 2.2l Duratec, approx 300bhp/210lbft SPC type-9 straight cut dogs 5 speed (rebuilt once with little wear) 2.2 1st, 0.86 5th 3.92 ZF plate type (rebuilt once with lots of wear) 13" wheels, mainly 6" ACB10, occasionally 8" ACB10 or for road 205/55 CR500 I think mine has an unusually high 1st. It seems to work fine, I certainly wouldn't want it any lower. Would prefer more of an overdrive for road use. Link to comment Share on other sites More sharing options...
I.Mupferit Posted January 14, 2008 Share Posted January 14, 2008 Raceline 2.3L 235 bhp (soon to be changed) BGH Sporting close 5 sp (same ratios as Rob's) 3.92 ZF plate type diff 14" wheels (soon to be changed) 195 AO48's Brent (aka Arfur Nayo) 2.3 DURATEC SV Reassuringly Expensive R 417.39 😬 Link to comment Share on other sites More sharing options...
MikeE Posted January 14, 2008 Share Posted January 14, 2008 Race*** 2.3l Duratec, approx 280bhp/215lbft R&R type-9 straight 5 speed 2.66 1st, 0.86 5th 3.92 diff 13" * 8" ACB10 for track, for road 205/55 CR500 R400 Duratec Build and Modification Pictures here Edited by - MikeE on 14 Jan 2008 17:58:54 Link to comment Share on other sites More sharing options...
BBL Posted January 14, 2008 Share Posted January 14, 2008 Cosworth 2.3l Duratec w/ 245 and 185 BGH 2.66 and .86 standard 3.92 13" A048 First two listed not yet installed - maybe this weekend (crosses fingers). - Sean Link to comment Share on other sites More sharing options...
moosetestbestanden Posted January 14, 2008 Share Posted January 14, 2008 2.0L w/ Jenvey (via SBD) injection, headers, HP don't know / Torque don't know - never dynoed, but it runs like a raped ape Bog std. "close ratio" Sierra 5 speed, 2.80 1st & .82 5th 3.62 LSD 13" Barnbys all around w/ Avon bias ply slicks at this moment Looking to do a gearbox switch when the Raceco motor project is done. I'm thinking 5 speed H pattern Quaife dog box w/ tall 1st (2.06 or thereabouts) because the track is the only place I drive the car now (except for the occasional trip to the market). ------- Chris Ad majorem 7 gloriam Link to comment Share on other sites More sharing options...
rgrigsby Posted January 14, 2008 Author Share Posted January 14, 2008 Seems like a fairly common theme running here, the 2.66 1st/0.86 5th with a 3.92 diff appears to be the one to go for. Rob G www.SpeedySeven.com Link to comment Share on other sites More sharing options...
dannylt Posted January 14, 2008 Share Posted January 14, 2008 Rob, not necessarily. Maybe it's just a common offered option for a "high first" and nobody insists otherwise? Why not try my 2.2 - I don't think it's too low at all, so it definitely makes a closer shift to 2nd. I had all the ratios somewhere, I'll dig it out. Link to comment Share on other sites More sharing options...
Stuart Faulds Posted January 14, 2008 Share Posted January 14, 2008 To be fair Danny, you could get away with a 1:1 first gear with these torquey lumps you keep spec'ing. FWIW the other 2 duratec cars I've got at the moment have the BGH tall first box's - one of which has done 30ish trackdays on the back of one of Ammo's lower powered engines (a 220bhp 2.0) without a hint of problem. Link to comment Share on other sites More sharing options...
simonbell Posted January 14, 2008 Share Posted January 14, 2008 I'd probably spec a different 1st ratio next time around, 1st doesn't last long on mine, not sure about 2.2 but I seem to remember there being a 2.39 option with quaife kits I think Simon Bell - Caterham 7 Duratec R I`ve seen the future.....and it`s powered by duratec Check out the website here Link to comment Share on other sites More sharing options...
dannylt Posted January 14, 2008 Share Posted January 14, 2008 Torquey lumps! I gave away 15lbft with this measly 2.2 engine I'll have you know... and you can tell. Link to comment Share on other sites More sharing options...
Stuart Faulds Posted January 14, 2008 Share Posted January 14, 2008 You're right, it's gutless. Link to comment Share on other sites More sharing options...
AMMO Posted January 15, 2008 Share Posted January 15, 2008 😬 Danny Didn't he gutless wonder manage to destroy 8 tyres in 500 miles at Spa last year? Yep you really missed that 15 ft lb 😬 Anyway in answer to the original question: I have one of those Raceco 2 litre Duratecs with 260 bhp 180 ft lb 2 litre with a BGH Sporting Close with 2.75 1.75 1.26 1 0.82 3.92 diff no LSD As the engine now has the ability to rev to 8,500 rpm I use it as a 4 speed box and use fifth for motorways and tooling around. If I was serious I would have a closer fifth and lower diff with an LSD. What I have suits me fine and I have no intention of changing anything in the engine and gearbox department. But that's what I always say! Ammo Raceco.com Edited by - AMMO on 15 Jan 2008 08:15:04 Link to comment Share on other sites More sharing options...
dannylt Posted January 15, 2008 Share Posted January 15, 2008 2.92 diff? Shurely some mishtake. And I can't see the point of having that sort of power without an LSD!? Link to comment Share on other sites More sharing options...
AMMO Posted January 15, 2008 Share Posted January 15, 2008 Error corrected! As for the LSD. You can't miss what you have never had. I seem to have plenty of fun without. No intention to fit one in the near future. Need to do more work on brakes and handling first. Then we'll see. Ammo Raceco.com Link to comment Share on other sites More sharing options...
Dobuy Posted January 15, 2008 Share Posted January 15, 2008 Self -assembled 2.3 Duratec with Raceline 280' cams, SBD pistons & rods, Raceline flowed head. Titan Dry Sump, approx 260bhp. Same box & diff config as Rob BGH Sporting close 5 speed 2.66 1st 0.86 5th 3.92 ZF Plate type diff Dubai Duratec SV Link to comment Share on other sites More sharing options...
dannylt Posted January 15, 2008 Share Posted January 15, 2008 Ammo - I think you're really missing out with the LSD. Why deprive yourself of more cheap fun? It makes it easier to drive if anything - more predictable and playful at the same time, and no bloody annoying spinning inside. A powerful Elise just about gets away without one, but not a powerful Caterham! And anyway, you have tried one - didn't you do a few laps of Brands in my car? Link to comment Share on other sites More sharing options...
AMMO Posted January 16, 2008 Share Posted January 16, 2008 Danny Yes I did do some laps at Brands in your car. Do you really think I knew what I was doing? In the the few laps I did I was mainly trying to stay out of people's way and bring the damn thing back to the pit lane in one piece. No time to make a decision on the LSD as I was concentrating on trying to use all the revs at least a few times and not go into the back of anyone, into the armco or the gravel trap. It was a relief getting out of the car because I really don't like the responsibility of being at the controls of somebody else's expensive bit of kit especially as we had some sort of "you bend it, you mend it" agreement. There is a long list of other stuff to do to the car before I get around to an LSD. Maybe one day. I enjoy it a lot as it is and there is a perverse sense of pleasure whizzing past someone when you have a screen, clamshells, a spare wheel carrier, "only" a 2 litre Duratec and no LSD 😬 Ammo Raceco.com Link to comment Share on other sites More sharing options...
MikeE Posted January 16, 2008 Share Posted January 16, 2008 I went out in Danny's car at Brands too and I'm not convinced he knew what he was doing either..................... Calm down now Danny just joking 😬 R400 Duratec Build and Modification Pictures here Link to comment Share on other sites More sharing options...
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