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  #31  
Old 31-10-2017, 01:07 PM
franky franky is online now
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Quote:
Originally Posted by jonbills View Post
fwiw, I recently switched back from a 3.36 to a 3.7. It really doesn't make much difference on the road.
I think I preferred the 3.36 at Santa Pod, since that keeps my peak RPM in 3rd around 8k ish. I think the 3.7 is a bit scary with revs maybe going up to 8500.

That’s the exact point, you’re only taking 500rpm, not 1500.
  #32  
Old 31-10-2017, 01:12 PM
Albrecht Albrecht is offline
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I think I preferred the 3.36 at Santa Pod...
You'd probably prefer a Torqueflite at Santa Pod.
  #33  
Old 31-10-2017, 01:17 PM
Nigel Brook Nigel Brook is offline
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diffs

I know someone on here (forest racer) who is running a 5:1, if he's put it in yet. Be interested to know how he's getting on with it.
  #34  
Old 31-10-2017, 01:48 PM
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You'd probably prefer a Torqueflite at Santa Pod.
I'm beginning to think I'd prefer to be using someone else's car at Santa Pod!
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  #35  
Old 31-10-2017, 06:14 PM
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SeanDezart SeanDezart is offline
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I ran my yellow Z on an R200 3.7 LSD and it was plenty quick and nippy enough and usefull for holding in third down the country roads.
I have gone for an R180 3.54 Subaru LSD and will see how that feels - it might be in keeping with my desire to be more of a sports GT than an out and out sportscar.
If I don't like it, I have others on the shelf of various rations both LSD and not - I'll change.

Alan - the 3.36 and 4spd - I've driven quite a few now is merely 3 decent gears and an overdrive and (ducks for cover) the 5spd is merely 1x gear more and an overdrive.

But agreed with you that changing the ratio from 3.? to 4.? will close up the gears....it's just that perhaps you've not driven regularly anything bigger than a an L24 with a mild cam and triples and those you have have need high revs to get the best out of them ?
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  #36  
Old 31-10-2017, 07:00 PM
Albrecht Albrecht is offline
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Quote:
Originally Posted by SeanDezart View Post
Alan - the 3.36 and 4spd - I've driven quite a few now is merely 3 decent gears and an overdrive and (ducks for cover) the 5spd is merely 1x gear more and an overdrive.
I think calling the 1:1 top gear in the 4-speed 'boxes an "overdrive" might raise a few eyebrows.

Quote:
Originally Posted by SeanDezart
But agreed with you that changing the ratio from 3.? to 4.? will close up the gears....it's just that perhaps you've not driven regularly anything bigger than a an L24 with a mild cam and triples and those you have have need high revs to get the best out of them ?
I've driven plenty of big-engined, big-powered L-gata engined S30s in Japan over the years. A few here too. I think I know what I'm talking about. If you've got the power to pull a 3.7 or 3.9 properly then all well and good, and many of the big-turboed cars like to push against a tall diff ratio and wide gear spacing (one of the outright fastest street cars I've ever been in was a Z31 which was running over 700ps and used a 3.1 diff ratio...), but we are not really talking about BIG power cars here.

Ideally you'd be planning your diff and gearbox ratios to suit tyre diameter against likely top speed needed. Easy on a track, and - theoretically at least - even easier for the road (because of national speed limits...) but you set the car up the way you want.
As Franky has been trying to get across, 4.375 and 4.44 diff gearing is just not that radical in the grand scheme of things with the size of tyre that he (and I) intend to use.

With a normally-aspirated engine, the way you go faster is - basically - to turn more revs.
  #37  
Old 31-10-2017, 07:23 PM
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Quote:
Originally Posted by Albrecht View Post
With a normally-aspirated engine, the way you go faster is - basically - to turn more revs.
Tell that to cyclists....pedal faster yes, but if you want to go faster, you 'up' a gear !

Agreed, one has to match the tyre/wheel size, diff ratio, gearbox ratios and engine characteristics.....for the use one expects and let's face it, for 90% of us here that's going to be on the public road for 95% of the time.

I'd rather be on my roads here than yours there in any Z !
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  #38  
Old 31-10-2017, 08:15 PM
Albrecht Albrecht is offline
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Quote:
Originally Posted by SeanDezart View Post
Tell that to cyclists....pedal faster yes, but if you want to go faster, you 'up' a gear !
By all means try a 3.1 and tell me how you get on.
  #39  
Old 31-10-2017, 08:53 PM
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Originally Posted by Albrecht View Post
By all means try a 3.1 and tell me how you get on.
Tried a 3.2 in a BMW M3 coupé - not bad but I'll stick with my 3.54 - good enough for Scooby STis which're no slouches, good enough for me.
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  #40  
Old 31-10-2017, 08:57 PM
franky franky is online now
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Quote:
Originally Posted by SeanDezart View Post
Tried a 3.2 in a BMW M3 coupé - not bad but I'll stick with my 3.54 - good enough for Scooby STis which're no slouches, good enough for me.
Totally different gearbox ratios though.

A big part is matching it to the engine, I’m staying very modest power wise, just s warmed through l24, one that is happy to Rev a little.

I’ll leave massive torque for the tdi motorway car.
  #41  
Old 31-10-2017, 08:58 PM
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L-gata, max rpm: 10,000, target max speed: 120 mph
Cyclist, max rpm: 100, target max speed: 30 mph.

So the cyclist is looking for 1/4 the top speed with 1/100 the engine revs available.

Clearly the cyclist will have to gear up more than the car.
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  #42  
Old 01-11-2017, 05:25 PM
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Quote:
Originally Posted by jonbills View Post
L-gata, max rpm: 10,000, target max speed: 120 mph
Cyclist, max rpm: 100, target max speed: 30 mph.

So the cyclist is looking for 1/4 the top speed with 1/100 the engine revs available.

Clearly the cyclist will have to gear up more than the car.
And clearly the car a silly ratio-ed diff...:

me at 120mph = 3000 revs
? at 120mph = 10000 revs

Quote:
Originally Posted by franky View Post
Totally different gearbox ratios though.

A big part is matching it to the engine, I’m staying very modest power wise, just s warmed through l24, one that is happy to Rev a little.

I’ll leave massive torque for the tdi motorway car.
Warmed through ? You're looking to increase power by +35% fitting triple carbs an' all.

I don't need massive torque on the m-way where the car rarely drops below cruising revs and accelerates sufficiently for easy overtaking.

I do like massive torque when accelerating which is before EVERY gear-change, exiting EVERY slow corner and take off from the line.

Perhaps spoilt because I've become used to having this under the right foot....when size really matters
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  #43  
Old 01-11-2017, 07:40 PM
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Never took much notice of the gear ratios in my scooby,it just gets there really quick,next time I go out in it I’ll make a note of the speed in different gears,for those of you out there that haven’t drove an Impreza all I can say is a well sorted scooby takes some beating
  #44  
Old 12-11-2017, 05:15 PM
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Rob Gaskin Rob Gaskin is online now
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Sold 'in the room' for £24k (+ fees I think).

Most cars at the auction were 'passed over' so it shows there was interest .

I think someone has a good buy if they are after a serious rally car.

Glad it didn't go 'dirt cheap'.
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  #45  
Old 12-11-2017, 06:11 PM
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Thanks Rob, any idea what the Porsche 930 replica made, it's a friend of mines car...?
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