Myles Posted November 2, 2005 Share Posted November 2, 2005 I'm keen to do some work on the current Type-9 while the car is in pieces... Have just spoken to BGH (Chris, I assume) and he suggested the 2.0 (litre) long-first with the following ratios for my 180+ 1.8 k on a 3.92 diff: 2.98 vs 3.36 (std) 1.97 vs 1.81 1.37 vs 1.26 1.0 vs 1.0 .82 or .87 vs .82 Hmm - dunno about that. Other than helping lengthen the first gear (not by much) and offering the chance of a slightly more sprightly 5th, it strikes me that I'll end up with wider ratios in the 2nd/3rd/4th area - and that can't be a good thing... He said that the 2.8 Sporting-Close might be too much of a handful with an overly-long 1st for the engine... 'Standard' 2.8SC ratios appear to be: 2.8 1.81 1.26 1.0 .85/.87 ...although I understand from TT-trawling that other options are available... Hmmm - whaddya think??? Project Scope-Creep is live... Alcester Racing 7's Equipe - 🙆🏻™ Alcester-Racing-Sevens.com Link to comment Share on other sites More sharing options...
Paul McKenzie Posted November 2, 2005 Share Posted November 2, 2005 For comparison my SPC semi-helicals are: 2.39 1.54 1.21 1.0 .87 and are perfect with a 3.92 diff in a VX HPC. I think the ones you're considring look a bit strange Paul Link to comment Share on other sites More sharing options...
Normans_Ghost Posted November 2, 2005 Share Posted November 2, 2005 Myles, look here. They are very low, very close but, as it says, acceleration over top speed. By the way the top speed's would need 9500+ rpm Norman Verona, 1989 BDR 220bhp, Reg: B16BDR, Mem No 2166, the full story here You and your seven to The French Blatting Company Limited Link to comment Share on other sites More sharing options...
Myles Posted November 2, 2005 Author Share Posted November 2, 2005 Thanks Norman, I'd already found that thread. I think I need to speak to them again - the 'standard' ratios seem to match 2nd,3rd and 4th of the '2.8 sporting-close' - whereas the 2.0-long ratios that were suggested change everything (apart from 4th...) Several people have warned about going too-long on the first gear as it can be a pain in traffic - but I don't really want to shorten 2nd or 3rd (I think). Hmmm. Project Scope-Creep is live... Alcester Racing 7's Equipe - 🙆🏻™ Alcester-Racing-Sevens.com Link to comment Share on other sites More sharing options...
Strangely Posted November 2, 2005 Share Posted November 2, 2005 Hi Myles, I went for these ratios on my BGH 5-speeder, with similar power and same diff: 1st 2.66 (2.75 was an option) 2nd 1.75 3rd 1.26 4th 1.0 5th 0.82 (other options were 0.84, 0.86, 0.89) It was called an E7 at the time. I'm completely happy with my choice. I'd ideally like an extra 6th ratio for motorway cruising (80 mph is about 4,500 rpm), but for it's fantastic. Link to comment Share on other sites More sharing options...
Normans_Ghost Posted November 2, 2005 Share Posted November 2, 2005 Agree with strangely. I've got about 500 miles to France next month, all M'way and it's going to be a pain. Bet it rains as well! Norman Verona, 1989 BDR 220bhp, Reg: B16BDR, Mem No 2166, the full story here You and your seven to The French Blatting Company Limited Link to comment Share on other sites More sharing options...
Paul Formston Posted November 2, 2005 Share Posted November 2, 2005 Hi Myles I have Fitted the B.G.H long first box in my new biuld Zetec 1800 engined seven and is great the engine is A standard 1800 Zetec with throttle bodys and Emerald management thay claim 160BHP but I don't know but the gearbox is great, can have A go in mine some time before you buy if you like then you will know if its for you mate Regards Paul Link to comment Share on other sites More sharing options...
Myles Posted November 2, 2005 Author Share Posted November 2, 2005 Strangely - hmm, that's odd... The std. 5th ratio is .82 - I don't really have an issue with m-way cruising. Perhaps that's because I always wear ear-protection with the aeroscreen... I *would* actually like a slightly-shorter 5th - it's just a tad too long for my liking - perhaps that's because my engine only really kicks-off at 4500rpm - with peak torque at about 5.9k Project Scope-Creep is live... Alcester Racing 7's Equipe - 🙆🏻™ Alcester-Racing-Sevens.com Link to comment Share on other sites More sharing options...
Myles Posted November 2, 2005 Author Share Posted November 2, 2005 Paul - *which* long first is it though? There are at least three by the sounds of it (2.0litre long first gives 2.98, Normans is a 2.66 and Oily's website gives the 2.8litre Sporting-close at 2.8...) Project Scope-Creep is live... Alcester Racing 7's Equipe - 🙆🏻™ Alcester-Racing-Sevens.com Link to comment Share on other sites More sharing options...
Strangely Posted November 2, 2005 Share Posted November 2, 2005 My 0.82 5th is great for drivability - 80 mph @ 4,500 rpm means that I'm right in the power band for overtaking, but given that I frequently cruise at a somewhat higher speed than that, it can't be good for the engine. Good job I don't do motorways too often. ISTR that the BGH 5th is slightly different to standard, perhaps 0.82 vs 0.825, or the other way around. I didn't mean to imply that cruising had been made worse with that box; it's no different really. If I cared that much about it then I could put on some 16" wheels (CR500s in 185/55 R13 don't help in that regard ). Edited by - Strangely on 2 Nov 2005 17:48:52 Link to comment Share on other sites More sharing options...
Myles Posted November 2, 2005 Author Share Posted November 2, 2005 Thanks. 4.5k is where my torque and power kick off too. How do you get on with 1st though? Is it a complete arse in crawly-crawly traffic requiring nasty amounts of clutch-slip? Project Scope-Creep is live... Alcester Racing 7's Equipe - 🙆🏻™ Alcester-Racing-Sevens.com Link to comment Share on other sites More sharing options...
rgrigsby Posted November 2, 2005 Share Posted November 2, 2005 Myles I've got these ratios in the BGH on my Duratec 2.75 1.75 1.26 1.0 0.86 The 1st is the shorter of the two options, Chris said the longer one is a bit of a pain on the road. For the 5th I went for something slightly shorter than the standard 0.82 as a 150+ top speed isn't really all that useful. My box is a sporting close although it looks like the 2nd I have is different to the one your quoting. TBH I don't notice the gears which kind of suggests the ratios are a fairly good match to the engine. Rob G www.SpeedySeven.com Edited by - rgrigsby on 2 Nov 2005 20:45:52 Link to comment Share on other sites More sharing options...
7 wonders of the world Posted November 2, 2005 Share Posted November 2, 2005 I've just bought a Tran X gear kit and they buuilt me a shaft up with a short 5th, OK this will hurt a little on the motorways but hey if you want to drive on motorways buy a Mondeo ! Using these with a 3.92 gives me the same overal range as a CC 6 speeder with a 3.62 The 3.92 might go if I can get my hands on a 4.1 though !! 2.48 1.69 1.27 1.00 0.9237 There are other ratio sets available and the guys are keen to help if you've specific requirement too. cheers Neil. Link to comment Share on other sites More sharing options...
Strangely Posted November 2, 2005 Share Posted November 2, 2005 Myles, as Rob said about his, I don't notice the gears. The 2.66 1st is fine, and I drive my 7 every day in towns and open roads. I don't notice having to slip the clutch any more than with my pre-BGH box (only when travelling in a very slow queue). This engine, gearbox and AP clutch have done 23k miles so far, and there's no sign of the clutch even needing adjustment. Rob's rev limit must be higher than mine, because I can only dream of doing 150 mph! With my 0.82 5th gear, I can do 129 mph with the shift light flickering on at 7,000 rpm . Link to comment Share on other sites More sharing options...
Myles Posted November 2, 2005 Author Share Posted November 2, 2005 Thanks - that's reassuring. I'll see what they say tomorrow. Project Scope-Creep is live... Alcester Racing 7's Equipe - 🙆🏻™ Alcester-Racing-Sevens.com Link to comment Share on other sites More sharing options...
rgrigsby Posted November 2, 2005 Share Posted November 2, 2005 Strangely I've got a 7500rpm rev limit with 205/13 CR500's on the back, the car top out at about 145 at the moment, but it gets there fairly easily so I reckon I could go back to a 0.82 top. What tyres are you running as gearcalc suggests 7000rpm with a 0.82 should be close on 135mph. Rob G www.SpeedySeven.com Link to comment Share on other sites More sharing options...
Strangely Posted November 2, 2005 Share Posted November 2, 2005 I've got CR500s in 185/55 R13 all round. Link to comment Share on other sites More sharing options...
philwaters Posted November 3, 2005 Share Posted November 3, 2005 Just to echo Jason's (strangley) comments. I fitted the same box last winter, and whilst I haven't driven my car much the difference is fantastic. No longer do I change up 2 secs after pulling away, and often pootle along at 25+ (say in traffic, etc) in 1st before realising I'm doing it. I'd say it is better in traffic than the old one as the gap from 1st to 2nd was so large that most traffic jam speeds meant I was running silly rpm in 1st, or bogging down trying to use 2nd. Now you can just hold 1st. Also really impressed with BGH's service, Brian was happy for me to turn up late the day or so before Xmas last year so I could fit it over the break Phil Waters Link to comment Share on other sites More sharing options...
Myles Posted November 3, 2005 Author Share Posted November 3, 2005 They're in the process of moving workshops BTW - so I've been warned that their current priorities are a little different to normal... I'll give'em a buzz once they've had a chance to sup the first brew of the day... Project Scope-Creep is live... Alcester Racing 7's Equipe - 🙆🏻™ Alcester-Racing-Sevens.com Link to comment Share on other sites More sharing options...
Strangely Posted November 3, 2005 Share Posted November 3, 2005 I checked in the car park this morning - I can go as low as 6 mph in 1st without having to slip the clutch . Link to comment Share on other sites More sharing options...
Myles Posted November 3, 2005 Author Share Posted November 3, 2005 I've been playing with Peter Ogden's gearcalc prog (on Arnies site) this morning and am as unsure as ever... Assuming a 6.5k rpm gear-change (7.5k is the rev-limit I use, but I don't *always* bounce off the limiter...): '2.0 long' vs 'Strangely 2.8 SC' 1st->2nd drops 6.5k to 4.3k vs 4.2k (ish) 2nd->3rd drops to 4.5 vs 4.7 3rd-4th drops to 4.8 vs. 5.2 I've got a dip in the torque-curve than bottoms out at almost exactly 4.2krpm and it then climbs until softening out at 5.2 with the peak at 5.9 ON the face of it, the 2.0-long ratios drop me right to the point where the torque picks up - but maybe too far towards the dip when you've lost a few rpm during the change? Decisions, decisions... ☹️ Project Scope-Creep is live... Alcester Racing 7's Equipe - 🙆🏻™ Alcester-Racing-Sevens.com Link to comment Share on other sites More sharing options...
Myles Posted November 4, 2005 Author Share Posted November 4, 2005 Boing! Still not phoned them again, and still not made up my mind... Project Scope-Creep is live... Alcester Racing 7's Equipe - 🙆🏻™ Alcester-Racing-Sevens.com Link to comment Share on other sites More sharing options...
Petrolhead Posted November 4, 2005 Share Posted November 4, 2005 Now in the correct place 😳 I would be looking at a 2.3 to 2.6 first Don't forget your pulling a very light car. I have often set of in 2nd with the R5 and on a couple occasions 3rd and the car pulls, of thirst is a tad difficult but the point is it does so because there is no weight. cat 6 spd is 1st - 2.69, 2nd - 2.01. As it pulls 2nd reasonably well I would have thought about 2.35 whick your car should pull as it has more torque lower down I alsways thought the SPC gear ratios looked about right - see here I would tend to leave 5th as .82 as you only need 5th for motorways as when out blatting will be using just 1-4th My ten peneth worth NE7Club Web Site R5 no 65 😬 Link to comment Share on other sites More sharing options...
Myles Posted November 4, 2005 Author Share Posted November 4, 2005 I'm not sure that BGH offer anything as long as 2.3 - but that would only give me 15mph between the top-speeds in 1st and 2nd and so 2nd would be redundant... ...it would also mean that I'd have to slip the clutch in stop-start traffic. FWIW, BGH seem to feel that the 2.75/2.8 first could be too long to live with on the road, but I think (from the sounds of it) that they're probably about right. Project Scope-Creep is live... Alcester Racing 7's Equipe - 🙆🏻™ Alcester-Racing-Sevens.com Link to comment Share on other sites More sharing options...
Myles Posted November 4, 2005 Author Share Posted November 4, 2005 Hmm - but having *looked* at the SPC ratios in the link you provided, they don't seem completely barking when I run them through the gearcalc with my tyres and wheels. Still not convinced to go longer than 2.75 though... Project Scope-Creep is live... Alcester Racing 7's Equipe - 🙆🏻™ Alcester-Racing-Sevens.com Link to comment Share on other sites More sharing options...
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