Porsche 915 or G50 in Bugs ?

Steve C · #1 January 3rd 2006, 08:05

Hi BugaRu

Thats a nice shifter, I think I will stay with the stock one.

I cut my torsion bars for two reasons,
1 Moving weight forward for better distribution.
2 A STI motor with variable cams fitted to a G50 would have put the cam covers out near the rear bumper.

Steve

BugaRu · #2 January 3rd 2006, 11:42

Does anyone know how much power a Porsche 915 Trans can hold. Also any idea of the R&P and 1-5th gearing?

Matrin... I checked out your Website but couldn't read German. By the way very nice and well done website.

Here is a link to one of my Websites. Nothing fancy, just shows some of my cars. Actually I need to spend some time on it and update it with newer pics and info. The 1966 Bug now has a new power plant.

http://www.bugaru.com/

Steve....
Is the STI engine being pushed backwards because of the added size of the Porsche Trans?

I'm using a STI Block but with SOHC's.. It makes the engine smaller. The pic attached "or should be attached?" This engine is rated at approx 325hp, on 8lbs of boost but I'll know better when I get it on the dyno.
Jon

trevorbrady · #3 January 3rd 2006, 16:27

mine is the same story as Steve. I cut the centre out of the torsion bar to shift the engine and gearbox forward. For me it was necessary as both the engine and gearbox are longer than the VW engine and gearbox. I want the whole assembly to fit under stock panels, i.e once the engine lid is closed nothing will be visible...

ricola · #4 January 4th 2006, 04:31

ditto!

Steve C · #5 January 4th 2006, 08:02

Hi

Your correct, I needed to move the motor & trans forward because of the lenght of the overall package, if you look at the photo of my motor you can see the lump on the left rear cam cover. I have seen SOHC motors in bugs before they fit nicley.

I read an article on a Aussie Subaru STI here http://autospeed.drive.com.au/cms/A_1824/article.html

that had a few upgrades, nothing much, better exhaust, piggyback EFI controller etc and it made 195 kW (261.5 hp) at the 4 wheels. I will do these upgrades before I put car on the road and then see if I need anymore power after that.

Steve

PS If you cant open the file at Autopseed let me know.

BugaRu · #6 January 4th 2006, 20:58

Steve.
Thanks for the link about the Tech tips on Subaru's. By the way it opened oK. I know what you mean about the cam covers on the DOHC engines. That's why I decided on using the SOHC heads on the STI block. Pic attached below.

Hey, I ment to tell you Nice Website, also great job on your 1972 Superbug.

Do you know Jak, and John from Auzzi who also have Subaru powered VW's. They both have great rides. Dang you Auzzi's just luv to wrench don't you?

Also any chance that you know what the gear ratios are for a G50 R&P and 1-5 ratios?

Jon

Subaru 2.5 with SOHC heads.

Bad bug · #7 January 5th 2006, 05:30

Does anyone here know were i can get a 915 gearbox in the states.

bean_8044 · #8 January 5th 2006, 09:20

ive seen a few on eBay..

Steve C · #9 January 5th 2006, 09:42

Hi

I know Jak & Paul very well, they live about 2 hours away from me, but we talk all the time and I often go to see them race. Jak posted photos of your motor on http://forums.aussieveedubbers.com a while ago, that is one sexy motor. It puts paid to the phrase "that if it dont go chrome it" your motor has go and the looks.

I was worried about the link opening, its a pay for view website that I subsribe too.

Thanks for your comments on my website and my old car.

The G50 ratios are,
1st 3.5
2nd 2.058
3rd 1.409
4th 1.074
5th .861
C&p 3.44

This is a gear chart I did for my car.
25.315 tyre
3.5 2.058 1.409 1.074 .861
1800 11.26 19.16 27.98 36.71 45.79
2000 12.52 21.28 31.09 40.79 50.88
2200 13.77 23.41 34.20 44.86 55.96
2400 15.02 25.54 37.31 48.94 61.05
2600 16.27 27.67 40.41 53.02 66.14
2800 17.52 29.80 43.52 57.10 71.23
3000 18.77 31.93 46.63 61.18 76.31
3200 20.02 34.06 49.74 65.26 81.40
3400 21.28 36.18 52.85 69.34 86.49
3600 22.53 38.31 55.96 73.41 91.58
3800 23.78 40.44 59.07 77.49 96.66
4000 25.03 42.57 62.18 81.57 101.75
4200 26.28 44.70 65.29 85.65 106.84
4400 27.53 46.83 68.39 89.73 111.93
4600 28.79 48.95 71.50 93.81 117.01
4800 30.04 51.08 74.61 97.89 122.10
5000 31.29 53.21 77.72 101.96 127.19
5200 32.54 55.34 80.83 106.04 132.28
5400 33.79 57.47 83.94 110.12 137.36
5600 35.04 59.60 87.05 114.20 142.45
5800 36.29 61.73 90.16 118.28 147.54
6000 37.55 63.85 93.27 122.36 152.63

Steve

Axl · #10 January 28th 2006, 15:12

Quote:

Originally Posted by BugaRu

Steve.
Thanks for the link about the Tech tips on Subaru's. By the way it opened oK. I know what you mean about the cam covers on the DOHC engines. That's why I decided on using the SOHC heads on the STI block. Pic attached below.

Hey, I ment to tell you Nice Website, also great job on your 1972 Superbug.

Do you know Jak, and John from Auzzi who also have Subaru powered VW's. They both have great rides. Dang you Auzzi's just luv to wrench don't you?

Also any chance that you know what the gear ratios are for a G50 R&P and 1-5 ratios?

Jon

Subaru 2.5 with SOHC heads.

I know this is a transmission thread , but does anybody know the HP rating on the 2.5L engine ? How does it compare to the DOHC 2.0L turbo engine . Any help would be appreciated , as I am going to go with a Suby engine , and I want the most HP I can get . Axl .

BugaRu · #11 February 5th 2006, 21:58

I'm not sure of all the spec's.. But here’s what I think I know. The DOHC engines will produce higher rev's a little quicker, plus if installing a turbo DOHC engine little needs to be done to the engine as it already has a turbo ready block. But your need to clearance the engine bay to get the engine to fit.

If space clearances are not an issue the DOHC will work and perform fine with plenty of power and easily upgraded. A DHOC engine measures just about 32" wide.

If space is an issue and you don't want to cut the inter-fender wells etc then the SOHC engines are an almost perfect fit with little or no clearance issues. The 2.5 with SOHC heads will measure just about 29" wide. The 2.2 SOHC engines will measure around 27" wide with plenty of clearance on both sides of the engine when installed. All Suby SOHC engines are respectfully about the same height with the DOHC engines being the highest, but other then the oil pan the height is not the issues with the Suby engines.

Weight. heaviest is the DOHC, then the 2.5 SOHC, with the 2.2 SOHC being the lightest of the Sube's

The 2.5 SOHC engines will produce more torque with almost square numbers between HP & Torque. Little if any head work is needed as the SOHC heads flow very well when used with a Turbo. If you use a STI block with the SOHC heads 300-400 HP is easily obtainable depending on moderate boost levels on your choice of Turbo's, but then again in an already light Bug how much HP does one really need. If you use the stock 2.5 SOHC block and decide that you want to run a Turbo your need to run race fuel or your going to destroy your engine, so if fuel is an issue it might be best to go with the STi block form the get go?

Perhaps some of the Sube-perts can elaborate and better answer your question?

Good luck

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