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Crotchety Old Bastard
 
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If you decide to stay with a single I have the turbo you need to hit 500+whp and will give you a trade-in on your K27. Threshold <2Krpm and 1bar <2800rpm @500+whp on EFI.
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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 12-16-2009, 04:14 AM
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Quote:
Originally Posted by SCHNELE View Post
You are not being realistic, you will need new tuning, modify your intercooler assuming you have a larger than stock one for your efi, fuel injectors may be maxed out, etc. There are better turbos than your K27 for spool so talk to some Garrett Guys first.
I am being very realistic. I've found plenty of used Audi turbos on Ebay for well under $100 each. I can build a set of headers for around $300 and rearranging the intercooler will be easy.

I run megasquirt II and do my own tuning

I run 60# injectors that are more than capable of feeding 500hp

Many people on this board told me it would cost over $10k to EFI my car - Wrong -

Many of the same people say putting twins on the car will cost just as much - Wrong again -

I'm not saying you Can't spend tons of money modding these cars, i'm just saying you don't Have to spend tons of money.

This is a hobby, and i'm a tinkerer. And very familiar with EFI and turbocharging so none of it is daunting to me. It's just an air pump
Old 12-16-2009, 06:03 AM
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twin turbo 930

Power to you. The Porsche tuners were raping the gold chain crowd for years, but most of that crowd moved into newer cars. It's time for "tinkerers" to take over and do it on a budget. I will be following your progress as I am debating twin versus single turbo for my 964 build.
Old 12-16-2009, 06:27 AM
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Turbofrog
 
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I would go the RarlyL8 route with one big good sized efficient turbo. Half the places that can leak or go bad. and if those spool numbers are good with aftermarket headers I'd like to go that route if I ever get a 930. Twin setup looks bada ss though.
Old 12-16-2009, 06:28 AM
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You be surprise what a single 60-1 HIFI will do, boost on demand good for around545RWHP but it will die after 140mph but for short runs, the best turbo I had.
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Old 12-16-2009, 07:54 AM
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Crotchety Old Bastard
 
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DIY fab work will significantly reduce the cost. K16s are cheap used turbos as well.
The bridge between twins and single turbos is much more narrow than it used to be. Twins have the bad-ass factor but return less value when considering cost, weight, complexity vs true performance. I would wager that there would not be a significant butt dyno performance difference between a properly setup single vs twin turbo 500HP EFI 930.
It is obvious that your mind is made up on this so we look forward to pictures and info. Twins are cool and if I had time I'd add them to my car just for that reason alone.
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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 12-16-2009, 07:57 AM
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MS-II EFI has come leaps and bounds in the last few years...it is a perfectly good setup for a nice, twin plug, coil-on-plug EFI system with all the nice bits. I say use the Audi turbos and call it good. Just make sure to either water cool them or use a turbo timer so they don't die early.
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Old 12-16-2009, 08:21 AM
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my mind is not set on twins, but i'll admit it has me curious. If there is a quicker responding single out there than my K27 7200 i'm all ears.

I like to hear other opinions so don't be shy
Old 12-16-2009, 09:00 AM
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Crotchety Old Bastard
 
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There are many turbos with a lower threshold than your 7200, but not many that will support 500HP. I've got a bolt-on you may be interested in AND you can trade in your 7200.
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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 12-16-2009, 12:13 PM
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Old 12-16-2009, 01:15 PM
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I can speak from experience - its is achievable







And it is expensive.

Here is a "brief" description of my build:
- 930 base engine
- 3.4L (98mm) Mahle P&C's, flame ringed
- Carrillo Con Rods
- GT3 Oil pump
- AASCO Twin Plugged heads, ported with new valves, Web springs & titanium retainers
- Porsche Motorsport Super Cup cams
- Twin K24/14 Turbo Chargers, balanced and blueprinted, hot side thermal coating
- Custom headers
- Twin O2 sensors
- Griffin full bay intercooler
- 993 TT Inlet manifold with custom injector risers
- Cam Sync Senor & Crank position Sensor

This is still a work in progress so I don't have any HP and Torque numbers yet.

Fitting this 930TT into a 911 chassis presents a few problems. The biggest being:
- Height on the whole set up to fit under the rear shelf / need to modify the sheet metal.
- RH turbo is too close to the oil tank / moving to a front mounted tank.
- Fitting the intercooler under the rear wing / still cutting and trimming fiberglass
- Getting enough oil cooling / RSR front mount + one in each fender

I am also a "tinkerer" and chose this direction to have something a little bit different.

Good luck with your decision.
Richard.
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Old 12-16-2009, 06:47 PM
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nice set-up
Old 12-16-2009, 07:08 PM
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Infidel
 
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Richard, fit a 993tt oil tank in the rear right wheel well, worked a treat on mine! You need to use a short oil filter on there but otherwise a reasonably straight forward job
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Jonathan.
87 930, 993 turbo engine, RS Tuning 520PS/515lbf-ft, Arrow Rods, ARP hardware, Solid lifters, G50-50, RS Flywheel, 890nm Sachs clutch, RSR coil overs all round, 993 C4 calipers front, 930 fronts on the rear, Ruf Speedlines.....
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Old 12-17-2009, 02:28 AM
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so, if i commit to doing twins is there anybody out there looking for a set of B&B headers, K27 7200 and custom muffler set-up? All in good shape
Old 12-17-2009, 07:44 AM
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Quote:
Originally Posted by drmatera View Post
so, if i commit to doing twins is there anybody out there looking for a set of B&B headers, K27 7200 and custom muffler set-up? All in good shape
Check for PM
Old 12-17-2009, 08:44 AM
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Jonathan,
I started down the path of a 993TT oil tank until I hit a big problem


My RSR rear fenders are fitted with brake ducts that take up all the space in the wheel well . I would have to cut it out to get the tank into place - so this isn't an option.

Richard.
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Old 12-17-2009, 05:17 PM
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Infidel
 
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Of course, that makes sense, I guess with the oil being pumped all the way up to the front cooler you can stick the oil tank anywhere you can! Your car is stunning BTW, top job
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Jonathan.
87 930, 993 turbo engine, RS Tuning 520PS/515lbf-ft, Arrow Rods, ARP hardware, Solid lifters, G50-50, RS Flywheel, 890nm Sachs clutch, RSR coil overs all round, 993 C4 calipers front, 930 fronts on the rear, Ruf Speedlines.....
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Old 12-17-2009, 11:31 PM
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Smile 930 Slant nose 76'

I need a electric diagram for the tilting lamps. The wired network is not intact then maybe you can tell me how to install it korekt ?

Old 12-18-2009, 10:36 AM
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are the 993tt tanks easy to come by? Not sure if i'll need it but it would be nice to have the option.

I picked up a pair of 996tt turbos over the weekend and after the holidays i'll start the conversion. I even made a drawing of how my intercooler will lay out.

Old 12-20-2009, 01:12 PM
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each core is 12" x 8" x 3" thick and will flow just over 600CFM each. I'm trying to fit the BOV in a pocket between the cores that will sit just over the engine cooling fan. I've got a customer thats an artist when it comes to tin work so i'll probably let him take care of the intercooler job.
Old 12-20-2009, 01:19 PM
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