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Quote:
Originally Posted by PDX-944 View Post
my biggest complaint with the 951 is the 5R trans I have. the 1st gear is SO long, and 2nd is SO far up there. most people are high in second while im still in first gear.
I also do hill climbs, none of that silly enclosed track stuff that will really test out the car. also some of the bigger AX venues. but I don't want to hit second, its too high up there
although I will hit the track later this year once at least, for free, for the first time. will be interesting.

I agree. Long gears and relatively limited rpm range where the engine is most efficient do reduce the competitiveness of these cars in slow and twisty tracks.
Old 03-22-2016, 12:03 PM
  Pelican Parts Technical Article Directory    Reply With Quote #81 (permalink)
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For that you can swap in S2 gearbox, especially on 2.5liter cars.
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Old 03-22-2016, 09:32 PM
  Pelican Parts Technical Article Directory    Reply With Quote #82 (permalink)
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Quote:
Originally Posted by Raceboy View Post
For that you can swap in S2 gearbox, especially on 2.5liter cars.
I have an s2 trans with a bad 2nd synchro just sitting here.
My 5r is lsd and cooled though... Tough decisions
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Old 03-22-2016, 11:20 PM
  Pelican Parts Technical Article Directory    Reply With Quote #83 (permalink)
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Just swap the LSD into S2 gearbox along with the cooler, I installed LSD into my S2 gearbox, and modified it to have 3 sintered friction plates at the same time (late BMW ones are thinner so 3 discs can be fitted without machining the diff housing).
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'83 924 2.5 16v Turbo, 530hp @ 1.5bar
'88 924 S 2.0 Turbo "Gulf", 370 hp
'67 911 widebody hot-rod /2.4S
'78 911 SC 2.5ss twin-turbo
http://www.facebook.com/vemsporsche
Old 03-25-2016, 12:55 AM
  Pelican Parts Technical Article Directory    Reply With Quote #84 (permalink)
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The s2 had a bad second synchro. That's the issue
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Old 03-25-2016, 08:38 AM
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I agree with shorter gearing for track application but for Auto X if you're able to stay in the one gear it will generally be faster than shifting occasionally to 2nd and then back again. Much faster. So, not such a bad setup as is for the moment as far as Auto X goes.
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Old 03-25-2016, 08:50 PM
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Unfortunately that's only true when I design courses so I can stay in first. The majority of courses at last have one section where I run out of gear and lose time.
Shorter gears would put me at 4500ish rpm rather than sitting at 6-6850(rev limit), they'd be in a great band with plenty of head room
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Old 03-26-2016, 02:03 AM
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Quote:
Originally Posted by PDX-944 View Post
The s2 had a bad second synchro. That's the issue
Just fix the S2 syncro issue, it is very cheap compared to 911 gearbox parts (915 and G50)
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'88 924 S 2.0 Turbo "Gulf", 370 hp
'67 911 widebody hot-rod /2.4S
'78 911 SC 2.5ss twin-turbo
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Old 03-27-2016, 01:23 AM
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Quote:
Originally Posted by Raceboy View Post
Just fix the S2 syncro issue, it is very cheap compared to 911 gearbox parts (915 and G50)
I've considered this. While I've done motor rebuilds and all, I've never touched a trans inside. It looked pretty difficult and time consuming..
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Old 03-27-2016, 09:21 AM
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You can take it to trans shop and they replace the syncros, you need the ring and pinion alignemtn done anyway by shop, might as well provide them parts and they do the job properly.
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'83 924 2.5 16v Turbo, 530hp @ 1.5bar
'88 924 S 2.0 Turbo "Gulf", 370 hp
'67 911 widebody hot-rod /2.4S
'78 911 SC 2.5ss twin-turbo
http://www.facebook.com/vemsporsche
Old 03-27-2016, 10:11 AM
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looks like about 1300 bucks to do that though at 944online, plus shipping. ouch
itd be easier to just swap the s2 r and p into my trans, compared to replacing the synchro, swapping the lsd in, and cooler. same cost probably. I wonder if ian at 944online would take the rest of the s2 trans as partial payment, since I know he could use it
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Old 03-28-2016, 12:07 PM
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Swapping ring and pinion means you strip the whole gearbox because all the gears are on the same shaft with pinion.

Why send it to 944 online?, Isn't there any local gearbox specialist or something? 944 gearbox is not anything special, just a usual 5spd gearbox that has diff in the same housing, that's all.
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'83 924 2.5 16v Turbo, 530hp @ 1.5bar
'88 924 S 2.0 Turbo "Gulf", 370 hp
'67 911 widebody hot-rod /2.4S
'78 911 SC 2.5ss twin-turbo
http://www.facebook.com/vemsporsche
Old 03-29-2016, 07:27 AM
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Kevin Gross does gearbox rebuilds as well. Not sure what he charges.
Old 03-29-2016, 07:34 AM
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ill shop locally and see what I come up with. I was just thinking with the value of the s2 box maybe hed take it for partial payment. even a little bit, and take the thing off my hands
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Old 03-29-2016, 07:43 AM
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ordered my longer front springs so I can lift it a little bit more - ordered them in 450# instead of 400#.
also ordered 31mm bars to replace the stock ones
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Old 03-30-2016, 02:54 PM
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and Lindsey just called, theyre out of 31mm for 5 weeks. looks like im stuck with 30mm or paying a bunch more
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Old 03-30-2016, 04:17 PM
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I'd have thought swapping the s2 ring and pinion would be the better option as the gears are reputed to be stronger than the s2 cogs?
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86 modified 951
Old 04-03-2016, 07:08 PM
  Pelican Parts Technical Article Directory    Reply With Quote #97 (permalink)
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Yes, the S2 trans I have is the AOS, which also has a shorter 5th
In the end I would just swap the r and p to the 5r.
With a gear calculator -
Currently I'm at 19mph in 1st, 32mph in 2nd at 3k rpm (when boost kicks in). I manage most courses in first but occasionally run out at 41mph at 6500rpm in 1st.
With the s2 r and p I would see:
16/28mph in 1st/2nd at 3k
36/61mph at 6500.
Assuming I was only trying to get up to 48mph or so 99% of the time, that means I would be using 3000-5100 in second with the s2 ring and pinion.
With the current setup I only use 3000-4500 in second.

The biggest issue will still be coming out of corners in second. 22 inch tires would be great, if it were possible lol, that would get me to 5800 rpm in second at 48mph
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Old 04-03-2016, 10:05 PM
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Well, shes been running pretty competitively the last two years, but has some oil seeps, and just found low compression in two cylinders (oil fouled plugs). I can put new plugs in, but if I hit rev limit with it set to cut spark, it will immediately foul them.
So im limping through the last few events with it set to cut fuel instead of spark, and shifting just shy of limit as much as possible.

but this winter will be time for a rebuild. rings and probably guides/seals. rings are top suspect because wet vs dry compression tests were quite different. but its had a long hard life so ill do it all.
I also have to do a cage, harness, hans, and more tires for next year, so I probably wont do much in terms of further mods.

but I could use help creating a list of rebuild parts to start collecting.

I see the rebuild kits from several places, those would be a good start I suppose... also going to need a clutch. sigh.
any tips on a few minor upgrades to help ensure longevity? im expecting it will be back to around 400 hp after this.

heres my second best run from last weekend. I forgot to push record on my best... ha
I pushed past a few apexes, though my tires were corded by about the end of this run anyways, so they were on the last legs.
https://youtu.be/5UbTNyhOtzE
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Old 08-07-2017, 02:07 PM
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Those Targa type stages are actually really dangerous. Trees right beside the track and then big drops should you run off. A split second from a nasty accident. Especially without much safety equipment from what I can see. No cage and uncovered skin. It's all fun until something bad happens. Be careful.

You also steer as if you're in a drift car. Is that for any particular reason? You shouldn't need to shuffle steer at all on that course. Having said that, you do quite well. It's just that in reality you shouldn't have to take your hands off the 10-2pm steering position at all on that course.
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Last edited by 333pg333; 08-20-2017 at 01:07 PM..
Old 08-19-2017, 03:35 PM
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