915 with a 76-77 930 4 speed or later G50? which is easiest?

[Robbbyg]

MY car has a 915 in it,

PO did this as well as turn it to cab,

Question i need to balance cost and time to work out which is an easier job to do and also costing needs to be taken into account,

Currently in the Car there is a 915 5 speed gearbox and cos of the stories i hear on HP i drive it like a girl when moving from start which i do not enjoy, its not so much the low speed take off its the thought always in the back of my mind with it comes a fear of not driving how i like to, so i want to look at upgrading back to factory 4 speed...

But as there has obviously been a conversion to a 5 speed would it be easier to swap it for a later model 930 box? for easier fitment? because i assume there is no more short bell housing..

Car has also got big brakes and upgraded heavy duty suspension on ill keep them on the car.

There might well be upgrades in the current 915 strength wise but i dont know as my reciepts only go back a few years,

I do know my current box runs with no problems and i would like to use it as a trade in for one of the above mentioned choices, how much is a good 915 worth?

How much money would this be to change over? any guesstimates??

cost of 930 4 speed
cost of g50?
any other options to look at so i dont have to worry about fast starts if in the case the need arises? which does happen..

[T77911S]

even with my 4 speed i take it easy from a start. just my opinion, these are not drag cars and where not built for that, plus i think it is just hard on the car, i would like mine to last.
first in my car is bad enough, i cant imagine trying to floor it in a 915. keep the 915, rebuild it and fix the weak points before they get too bad and enjoy 2-5.
i cant really enjoy my car where i live. 1st gear (60mph) breaks all the speed limits around me.
i was telling someone my 914-6 i buitl was more fun to drive. after thinking about i realized why. i could drive the car hard at low speeds in 2nd and 3rd and not be over 100mph pissing people off and getting arrested.

[Robbbyg]

Originally Posted by T77911S

even with my 4 speed i take it easy from a start. just my opinion, these are not drag cars and where not built for that, plus i think it is just hard on the car, i would like mine to last.
first in my car is bad enough, i cant imagine trying to floor it in a 915. keep the 915, rebuild it and fix the weak points before they get too bad and enjoy 2-5.
i cant really enjoy my car where i live. 1st gear (60mph) breaks all the speed limits around me.
i was telling someone my 914-6 i buitl was more fun to drive. after thinking about i realized why. i could drive the car hard at low speeds in 2nd and 3rd and not be over 100mph pissing people off and getting arrested.

Speed limits do suck

I think this is why theres so many cars out there with rust cos they sit half their life in a garage and the other half driven so slow that water doesnt run off them..
LOL

Anyway appreciate your point of view but it doesn't apply to me and doesnt help my query

A 915 is no good because 915's were not originally put in 930's for a reason et c etc etc
I wont hang on to something that was not designed for my car

So
value of 915?
value of short 4 speed?
labour cost?
exchange amount?

Or easier faster to go to LAte Model 930 BOX if so which year is best?

need stuff like that

[T77911S]

ah, thought u had a 76 911 with a 930 engine.

[quattrorunner]

You can sell the 915 on this continent for $1k and trade it up for a g50 or 930 from someone that does that for more. Little more.
If the box is documented you could get more.
Good idea btw. I'm trying to get this done too. Sucks having to be limited to a hp because you will break if you go higher. I've already broken one.

[RarlyL8]

Unless your 930 is putting down 300+HP at the wheels you will be going backwards installing a 4 spd. The 915 is a great tranny for your application if the engine is stock.
If you do plan to go big then it will cost you $5K+ to replace with a 4spd or $10-$15K for a G50 after you hack up the chassis to make it fit.

[jbrown]

Originally Posted by RarlyL8

Unless your 930 is putting down 300+HP at the wheels you will be going backwards installing a 4 spd. The 915 is a great tranny for your application if the engine is stock.
If you do plan to go big then it will cost you $5K+ to replace with a 4spd or $10-$15K for a G50 after you hack up the chassis to make it fit.

I have a transplanted turbo motor in my 83 cab and originally I had the 915.. I agree with 300 HP range you will be fine as long as you dont do 1st gear launches.
I am now in the 400+ WHP range and I had a short bell housing 4 speed turbo tranny in there now and works great with higher HP. I do think you would have a hard time getting the complete job and parts for $5000.00 Those short bell housing trannies are the only one that would fit in you car and are getting hard to find. You still have to change some other stuff too....

[Robbbyg]

Originally Posted by RarlyL8

Unless your 930 is putting down 300+HP at the wheels you will be going backwards installing a 4 spd. The 915 is a great tranny for your application if the engine is stock.
If you do plan to go big then it will cost you $5K+ to replace with a 4spd or $10-$15K for a G50 after you hack up the chassis to make it fit.

Factory condition My car is 1050kg Gross, then removal of All Aircon system compressor etc, Heater Box, the big Water holder thing, mats, some carpet and the jack Extremely light , Easy under 1000kg so i get to speed very quickly, first is unusable second ive got about 2 seconds before im going for thirdm ITs a Gokart, and she sits about 1 inch off the road,

HP on its own is approx 380 to 420 with The Porsche upgrades on the car and a couple of not porsche upgrades that (might be on the car) i say might because im TRYING to keep my car Bone Factory Stock and change it where i can to Factory Stock, ie: get rid of 915. (will keep the fast bits)

i bet if i planted it in first or second for that matter the Tranny will end up on the road

ITs bad always having it in the back of your mind, we need to feel 100 percent confident in these machines and having a mechanical area that is always ...etc .. well you know what i mean..

Keep in Mind, all the Euro engines when Tested that didnt make 260hp were not installed, variations can be fron 260hp to 285hp in stock form nothing added, that with the light weight, In my opinion the 75-77's were faster then all the US 930's from 78 to 89

AND MY CAR is the last 1977 930 ROW EURO PORSCHE made in the world, so thats gotta be 150hp on its own?? lol

A Thuoght,

Is there a WAY any way? that i can reinforce the 915 box???

Id be happy to do that if its possible/

[Robbbyg]

Originally Posted by jbrown

I have a transplanted turbo motor in my 83 cab and originally I had the 915.. I agree with 300 HP range you will be fine as long as you dont do 1st gear launches.
I am now in the 400+ WHP range and I had a short bell housing 4 speed turbo tranny in there now and works great with higher HP. I do think you would have a hard time getting the complete job and parts for $5000.00 Those short bell housing trannies are the only one that would fit in you car and are getting hard to find. You still have to change some other stuff too....

Heres the crunch,

My car has now a 915 box so changes were made....
So does that mean a short bell housing will no longer fit in my car?

then i could look at later ones if thats the case??

[quattrorunner]

I'd say your about 100hp high in your estimate. That 915 makes it feel like that though.
There are lots of things you can do to add strength to the 915 but they're not cheep and my thought in the subject is that it's cheeper to replace it with a good used one when it lets go. And you can sell the bad one for parts too. I ended up shelling out only $100 extra last time I swapped it.
Check out California motorsports, Patrick motorsports and wevo for the 915 upgrades. After all is said and done, your left with a trans that will let go with 350lb ft of torque. Sad to say.

[RarlyL8]

I ran a modified '86 Euro 915 with oil cooler in my 930 powered SC. The engine put 360HP to the wheels in final form and the tranny did fine. I spun the tires in 1st and 2nd every time I drove it. As long as you let the turbo do the work the tranny is OK. Modifications were WEVO bearing retainer and HD side plate cover.
Going back to stock is smart for resale purpose but the car will not be as fun to drive. I considered the 915 to be disposable as they should last for a few years and can be replaced for $1000.
The 915 is the same belhousing size as the early 4spd. A late 4spd can be used if the housing is machined or you push the engine back an inch. I have seen adapters made that reposition the engine as well.

[Robbbyg]

Originally Posted by RarlyL8

I ran a modified '86 Euro 915 with oil cooler in my 930 powered SC. The engine put 360HP to the wheels in final form and the tranny did fine. I spun the tires in 1st and 2nd every time I drove it. As long as you let the turbo do the work the tranny is OK. Modifications were WEVO bearing retainer and HD side plate cover.
Going back to stock is smart for resale purpose but the car will not be as fun to drive. I considered the 915 to be disposable as they should last for a few years and can be replaced for $1000.
The 915 is the same belhousing size as the early 4spd. A late 4spd can be used if the housing is machined or you push the engine back an inch. I have seen adapters made that reposition the engine as well.

OK the WEVO KIT AND HD side plate cover???
Im interested,
what is the cost on these where can I get them from and can I do installation myself?

[RarlyL8]

The tranny must be dissasembled to install the bearing retainer. Side cover is simple replacement with late model unit.