| Author | Message | ||
| Jeffrey Davison (Jeffdavison)
Junior Member Username: Jeffdavison Post Number: 113 Registered: 7-2002 |
Steve, Thanks for the info. Went to the owners sight and dl'd both the 208GT4 and 308QV owners manual in .PDF format. Got the numbers for the gearing on both and compared apples with apples. The only difference is basically the final drive on the 208 being taller (4.6 vs. 4.06) and top gear being lower (.881 vs. .919). This would jive, in that the smaller motor needed to move quicker (almost a 2 ton car w/only a 180 hp motor) and still deliver a reasonably fast top speed (220 kph advertised). I think I gots it fingered out  Thanks again fella's Jeff Davison | ||
| Steve Magnusson (91tr)
Intermediate Member Username: 91tr Post Number: 1740 Registered: 1-2001 |
(made an edit below) | ||
| Steve Magnusson (91tr)
Intermediate Member Username: 91tr Post Number: 1739 Registered: 1-2001 |
The "Dino208GT4" OM is on the Owner's site. If you don't have access, let me know and I'll post the gear ratios from section 1. It shows the same 27/30 for the transfer gears, but 15/69 for the differential (rather than 17/63) -- even though the overall ratios listed for each gear do match the values shown in Jens' 208GTB/S table. | ||
| Jeffrey Davison (Jeffdavison)
Junior Member Username: Jeffdavison Post Number: 112 Registered: 7-2002 |
meant to say.....all I need are the 208 GT4 idividual & transfer assuming the 17/36 -- 3.706-- is the final ratio than Jens provided is corrected by the tire size I'll be using (275/50x15) in stead of the stock 208GT4 (195/70x14)tires.... to determine the numbers I really need to know Jeff Davison | ||
| Steve Magnusson (91tr)
Intermediate Member Username: 91tr Post Number: 1738 Registered: 1-2001 |
In the OM section 1 or in the OM gearbox section. I think most (if not all) of the 308s are 27 teeth on the clutch output shaft and 30 teeth on the gearbox input shaft -- i.e., the engine spins 30 revs to turn the gearbox input shaft 27 times. If anyone's aware of a different 308 stock transfer (idle) gear set-up please post... | ||
| Jeffrey Davison (Jeffdavison)
Junior Member Username: Jeffdavison Post Number: 111 Registered: 7-2002 |
So all I need then is the transfer gear ratios? Where do I find these? Thanks, Jeff Davison | ||
| Steve Magnusson (91tr)
Intermediate Member Username: 91tr Post Number: 1736 Registered: 1-2001 |
Jeff -- "conventional" is a relative term  The 1:15.722 is the "overall" first gear ratio for wheels-to-engine (i.e. -- for the wheels to spin 1 revolution the engine crankshaft must make 15.722 revolutions) so it's defined as: "overall" first gear ratio = (individual first gear ratio) x (transfer gear ratio) x (differential ratio) So to answer your question, take the overall ratios given in Jens' table, divide by the transfer gear ratio, and divide by the differential ratio to get the true individual gear ratios. PS And you've got to be careful because I just noted that in the '78 308B/S US OM that they give the teeth count -- for example 13/42 for first gear (which is 1:3.231) yet they also list first gear as 1:3.588 -- which already includes the 27/30 ratio of the transfer gears. Jens -- Can you check the numbers in your table again? I don't see how the SUI 3rd gear ratio can be "taller" than the SUI 4th gear ratio? -- you'd actually be downshifting slightly going from 3rd to 4th??? | ||
| Jeffrey Davison (Jeffdavison)
Junior Member Username: Jeffdavison Post Number: 110 Registered: 7-2002 |
Jens, all... I am a bit confused by the numbers supplied, i.e first gear 1:15.722 That is way way different than something like a 3.58: 1 ratio. What nomenclature / numberind system is this and how can it be converted to conventional numbers???? Jeff Davison | ||
| Harry (Harry)
New member Username: Harry Post Number: 35 Registered: 3-2002 |
Switzerland has strict noise restrictions and use(d?) to measure full acceleration in 2nd gear for the noise test. This is why the gear ratios are longer in that gear. In 2nd gear the engine rev in US models is 15% higher and Euro 5% higher compared to Swiss models, what makes a difference in noise level. Motorbike manufacturers have even limited the throttle opening in 2nd gear to pass this type test in Switzerland. | ||
| Hans E. Hansen (4re_gt4)
Intermediate Member Username: 4re_gt4 Post Number: 1177 Registered: 4-2002 |
It's my understanding that Switz has and/or did have some very restrictive emission requirements. Much more so than most of Europe, maybe on par with US during the '70s. Gear ratios? With restrictive emissions and the terrain, imagine climbing a cliff with a potato up *your* tailpipe. | ||
| Jens Haller (Jh280774)
Member Username: Jh280774 Post Number: 510 Registered: 9-2001 |
David, Wondered about that as well! Perhasps special gear ratios for steep mountains... Con saluti cordialissimi, Jens Haller | ||
| david handa (Davehanda)
Member Username: Davehanda Post Number: 660 Registered: 5-2001 |
I can understand the differences in transmission between North American and European 308's, largely due to emmission and subsequent power differences, but why did Switzerland have their own set up? Anyone? Dave | ||
| Steve Magnusson (91tr)
Intermediate Member Username: 91tr Post Number: 1715 Registered: 1-2001 |
Jeff D. -- If you go to the FerrariUK site (thru the Owner's Site) they've got the 208 and 308 SPC illustrations/PNs so you could verify what gearbox parts are the same or different. Might be worth a little homework (like verifying the main gearbox housing is the same PN) -- just a thought... | ||
| Jens Haller (Jh280774)
Member Username: Jh280774 Post Number: 506 Registered: 9-2001 |
Jeffey, Just looked up in the Bluemel book and the gear ratios between the 208GT4 and the 208GTB are indeed the same. The overall gear ratios of the 308 GTB/S qv depend on which country it was delivered to: Is it a european, US or Switzerland model? Anyway: I just type in all versions ratios: 308 GTB/S QV GEAR Europe US SUI First 1:13.072 1:13.888 1:13.303 Second 1:8.996 1:9.559 1:8.719 Third 1:6.473 1:6.878 1:4.274 Fourth 1:4.756 1:5.055 1:4.611 Fifth 1:3.514 1:3.736 1:3.529 Reverse 1:12.419 1:13.194 1:12.036 Final Drive 17/65 16/65 17/63 Hope I didn�t have a writing error somewhere in between. Normally it should be OK! Good luck for your project! Con saluti cordialissimi, Jens Haller | ||
| Jeffrey Davison (Jeffdavison)
Junior Member Username: Jeffdavison Post Number: 96 Registered: 7-2002 |
Jens, The 308QV motor I'm building came from a 1984 308GTB If you have those numbers handy, that would be appreciated Thanks Jeff Davison | ||
| Jeffrey Davison (Jeffdavison)
Junior Member Username: Jeffdavison Post Number: 95 Registered: 7-2002 |
Jens, Thanks for the info. I'll go on the assumption that the 208GTB has the same ratios as the 208GT4. It's the GT4 that I have my hooks into. If anyone finds different. PLEASE let me know.. again, thanks for the footwork and help guys! Jeff Davison | ||
| Jens Haller (Jh280774)
Member Username: Jh280774 Post Number: 505 Registered: 9-2001 |
Jeffrey, Since I am home and have some time at hand: Here are the overall gear ratios for the 208 GTB/S and 208 Turbo: GEAR: 208GTB/S 208 TURBO First 1:15.722 1:15.479 Second 1:10.823 1:10.146 Third 1:7.787 1:7.301 Fourth 1:5.722 1:5.366 Fifth 1:4.052 1:3.780 Reverse 1:14.936 1:14.005 Final drive 17/63 16/69 Obviously there is a difference between the gearing of the 208 and the 208 Turbo. You need to know from which car the tranny is (normal/turbo). I (and all others who have the Bluemel book as well) can give you the other 308 gear ratios as well. Just tell which 308 type you want to know (normal/i/qv)! Hope that helped a bit! Best wishes from Germany Con saluti cordialissimi, Jens Haller | ||
| Hans E. Hansen (4re_gt4)
Intermediate Member Username: 4re_gt4 Post Number: 1166 Registered: 4-2002 |
Jeff: Check "Original V8". Shows the ratios. If no one else pipes up, I'll be home later and look. As I remember, the final drive is quite a bit shorter, and 1st may be a little deeper as well. The 208GT4 accelerates surprisingly well, in no small part because of it's ratios. But it runs out of steam above 70 or 80mph. Highway revs are almost unbearable. | ||
| Jeffrey Davison (Jeffdavison)
Junior Member Username: Jeffdavison Post Number: 94 Registered: 7-2002 |
Specifically I need to know the differences in gearbox / trans / diff. I'm looking into acquiring the 208 / tranny from Cavolino. I'll just be using the tranny on a 308 motor I'm building. Gearing will be very important in this setup. I'm working with Mark Eberhardt and building a supercharged 308 wich will go into a Stratos Replica. Weight is only 1800 lbs and having a good set of ratios for this setup is critical! Thanks guys Jeff Davison Jeff Davison | ||
| Hans E. Hansen (4re_gt4)
Intermediate Member Username: 4re_gt4 Post Number: 1162 Registered: 4-2002 |
I *think* the 208 in question was from a GT4, so it's not a turbo. Or I could be totally all wet. | ||
| William H (Countachxx)
Intermediate Member Username: Countachxx Post Number: 2362 Registered: 2-2001 |
the 208 is turbo'd I'm sure that has some impact on the gearing but i dont know what it would be | ||
| david handa (Davehanda)
Member Username: Davehanda Post Number: 657 Registered: 5-2001 |
I believe the gear ratios are different. It is posted in the Keith Bluemel's book....Don't have it handy.... | ||
| Jeffrey Davison (Jeffdavison)
Junior Member Username: Jeffdavison Post Number: 92 Registered: 7-2002 |
I'm contemplating buying the 208 engine/tranny from Cavalino Motors in Florida (have seperate thread asking their credability and reputability in the general forum). Is the tranny used in the 208 (European downsize V8) the same as the 308? Does anyone know what the gearing is compared to the 308? Thanks! Jeff Davison |