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Registered User
Join Date: Aug 2004
Location: enfield ct
Posts: 498
4spd or 5spd what is the difference ?

The p.o. installed a 915 trans in my 930s I know the gearing in the 4spd suits the turbo motor but are there any advantages of the 5spd ? Is there a different top end ?
Thank you in advance

1986 blk 930
2000 expedition
2000 bmw 3 series convertable
1996 Silverton 312 sedan bridge
Old 04-26-2007, 02:06 PM
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WydRyd's Avatar
Join Date: Mar 2002
Posts: 3,563
Different gear ratios make the 915 quicker off the line, however, don't abuse that g/box. It's weaker than the 930 or G50 boxes
'89 911 Turbo Cab
Protomotive MAP ECU, Twin Plugged Heads, GT2-EVO CAMs, 3.3L fully finned P&C's, ARP fasteners, C2T head gaskets, Titanium Retainers, Turbo spec valves, springs & guides, 964 splash valves, GT35R BB turbo, GSF Stainless Headers, Magnaflow Exhaust, Full bay Intercooler, TiAL 46mm w/gate, TiAL 50mm BOV, Apexi AVC-R EBC, SPEC Stage3+ Clutch kit, Crane CDI Ignition
Old 04-26-2007, 04:20 PM
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Crotchety Old Bastard
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Join Date: Jan 2000
Location: Huntsville, AL
Posts: 14,078
Bruce Anderson has a few blurbs in his book about folks fitting 915s into a 930 in the days before the G50.

The bad news is the 915 5spd is not nearly as strong as the 930 4spd. The good news is that if your engine is stock it doesn't need to be that strong. More good news is that for the cost of a set of core Webers you can buy a good 915.

I have a 915 in my widebody 3.3L turbo powered SC. The gearing is great for a stock 930 engine, it make it feel like 100HP more than it is. The gearing becomes not-so-good once you hit the 275RWHP figure. At that point (in my opinion) you have enough brass to use the long legs of the 930 4spd.

The top end will be gear limited with a 915. I can pull about 155mph at close to 7000rpm in 5th gear. Very fun stuff!

Again, with a stock or warmed-over engine a 915 is great fun. With a built engine it is a liability.

RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 04-26-2007, 06:36 PM
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