daniel mason
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| posted on 3/6/15 at 09:53 PM |
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3.38 would be better on the road and long tracks like oulton. 3.62 possibly at sprints or short tracks like blyton!
Like I said yo can get a ratio put into your 7 1/2" diff then just bolt the diff back into the chassis with no messing around
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mark chandler
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| posted on 4/6/15 at 08:24 AM |
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quote:
Originally posted by craig5
3.6 too high?
My humble blade engine ran out of revs with a 3.65, you need to be targeting the highest ratio you can obtain IMHO
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craig5
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| posted on 4/6/15 at 08:31 AM |
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quote:
Originally posted by mark chandler
quote:
Originally posted by craig5
3.6 too high?
My humble blade engine ran out of revs with a 3.65, you need to be targeting the highest ratio you can obtain IMHO
So higher is lower ie 3.2 is high yer than the 3.6?
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craig5
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| posted on 4/6/15 at 08:33 AM |
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quote:
Originally posted by daniel mason
3.38 would be better on the road and long tracks like oulton. 3.62 possibly at sprints or short tracks like blyton!
Like I said yo can get a ratio put into your 7 1/2" diff then just bolt the diff back into the chassis with no messing around
Was hoping to keep the 4.1 as spare and if I ever desided I wanted to do sprints
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mark chandler
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| posted on 4/6/15 at 12:16 PM |
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3.14 LSD in mine now, 1st gear overcomes traction from my slicks when sprinting, I notch up to maybe third gear on the straight bits.
A lower diff, say 4.1 would mean I would be pulling away in second or third and driving in 4th to 6th as gear changes cost time.
You have to balance with your engine, a low ratio diff, 4.1 would not be nice on the road.
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craig5
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| posted on 4/6/15 at 12:41 PM |
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http://pages.ebay.com/link/?nav=item.view&alt=web&id=111200999094
Is that what I would need to go to 7" from 7.5"?
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gaz_gaz
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| posted on 4/6/15 at 02:32 PM |
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think of a washer but 6mm thick.
Not sure how the diff is mounted in your chassis but you'll need at least 4 of these.
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craig5
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| posted on 4/6/15 at 03:40 PM |
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why would I need 4?
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daniel mason
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| posted on 4/6/15 at 04:21 PM |
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One at each Side mounting point.
Whilst I understand what mark is saying with gearing, I disagree! Rattle through the gears as fast as you can and make use of the cars
acceleration!
This is my mate Bradley doing a hillclimb,he gears his car to get through the box fast and he's mega quick! He fires through the box in no
time
https://m.youtube.com/watch?v=JEaqKwBmvJ8
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craig5
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| posted on 4/6/15 at 05:20 PM |
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Think my head is fryed lol I always thought the diff between the 7 and the 7.5 was the caseing
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craig5
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| posted on 4/6/15 at 05:47 PM |
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just spoke to Phil and this is his reply - so???
Hi Craig
It doesn't need any spacers as diff is held in a cradle mounted at front in tunnel and rear bracket across the diff and bolts to chassis - see
pictures.
thanks
Phil
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mark chandler
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| posted on 4/6/15 at 06:50 PM |
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Maybe I,m just to old, turning bends and changing gears gets a bit confusing and mucks up my lines on sprints, on the track I'm fine as plenty
of practice.
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craig5
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| posted on 27/6/15 at 08:24 AM |
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why would i need 4 spacers when there only 3 mounting points?
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daniel mason
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| posted on 27/6/15 at 08:26 AM |
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I'm assuming he thought it had 2 mounts each side meaning 4 x 1/2" spacers
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craig5
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| posted on 27/6/15 at 08:28 AM |
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daniel what size spacers would i need as seen people saying use washers or a nut but that wouldnt be safe would it
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gaz_gaz
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| posted on 27/6/15 at 08:42 AM |
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alot of people use washers,
look at this picture and it may help you out..
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daniel mason
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| posted on 27/6/15 at 08:57 AM |
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Washers may be better,or a spacer plus a washer?
You obviously need it tight with no play at all, but don't want to be bending the diff mounts due to incorrect sized spacers,it need to fit
properly.
Personally I'd have just bolted in another 7 1/2" unit as suggested before,but now you gave the 7" unit your just going to have to
make it fit
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craig5
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| posted on 27/6/15 at 09:49 AM |
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my system totally different to that i have a craddle front and rear
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CosKev3
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| posted on 27/6/15 at 10:26 AM |
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quote:
Originally posted by craig5
my system totally different to that i have a craddle front and rear
put a pic up so people can help?
Regarding ratios mine on a 3.62 with 15inch wheels hit the rev limiter in 6th at 120mph on rolling road.
So I would guess for most tracks you will need a 3.38 or you will be hitting rev limiter in 6th quite often unless its a very small twisty track.
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craig5
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| posted on 27/6/15 at 10:30 AM |
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hi kev couldnt find a 3.38 but im on look out but dont mind gettin a collection of diff always handy in times of needs regards diff im in work now on
lathe so hopefully within the hour be ready to try again
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CosKev3
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| posted on 27/6/15 at 11:01 AM |
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My diff is currently being rebuilt with a 3.38 cwp 
Bought the 3.38 diff off EBay from Estonia, £200 delivered 
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craig5
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| posted on 27/6/15 at 07:46 PM |
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well diff is in :-) just got to get correct height of front to engaged reverse electric motor
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craig5
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| posted on 2/7/15 at 03:21 PM |
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car is back up and running :-)
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CosKev3
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| posted on 2/7/15 at 04:43 PM |
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Nice one 
Where abouts in North Wales are you?
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craig5
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| posted on 2/7/15 at 04:48 PM |
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Northop hall few miles outside mold
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