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Crotchety Old Bastard
 
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Join Date: Jan 2000
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Rowan, it takes heat and fuel to light 'em up. If your engine runs cool or your muffler runs cool, or your AFR's are only mildly rich, or your throttle bipass valve is working properly (most don't or are removed) you won't have enough heat and/or fuel to put on a show. A strong ignition would have a more complete burn as well.
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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 02-11-2009, 05:45 PM
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Me like track days
 
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Excessively rich midrange (easy to do on modern early-full-boost-turbos which get full boost at 3k) and deceleration at 3-5k does the trick every time ;-)
I wish my car still did it, but since the rpm switch insall...no mas -
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"930 is the wild slut you sleep with who tries to kill you every time you "get it on" - Quote by Gabe
Movie: 930 on the dyno
Old 02-11-2009, 06:09 PM
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Any chance on a non turbo shooting flames?? My 86 Targa has a Steve Wong chip, SSi's and an M + K 2 in 2 out.

Cool video, not our vintage but great sound

http://www.youtube.com/watch?v=T19JjF0Q1oU

Damn, now I am getting flame envy!
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MG---1986 911 TARGA, SSI'S, STEVE WONG CHIP, M&K EXHAUST, ELEPHANT RACING GOODIES + TRU DESIGN CUSTOM FUCHS
1989 930 FACTORY SLANT NOSE -- RARLYL8 EXHAUST, K27 7200, TIAL 46MM, 0.9 BAR SPRING, GARRETSON INTERCOOLER , LEASK WUR, WEGO IV AFM AND NHS BOOST GAUGE.
2012 DODGE RAM 3500 LONGHORN 4X4 "EVERYTHING BUT THE KITCHEN SINK"
Old 02-16-2009, 04:28 PM
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Blackbird Pilot
 
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Brad - I envy you dude - with my EMS there is no chance I can blow flames due to it being so damn efficient...that trip was so cool watching you flame out after every short burst
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Old 02-17-2009, 08:15 AM
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Quote:
Originally Posted by mickster8888 View Post
while racing my buddy the other night he said i was shooting flames out both exhaust pipes at times. is this normal or is there a problem? car is 1983 euro 930. thanks in advance.
Well now you can tell your friend that the flames are just a part of the legend and lore that makes the 930 the best damn car on the planet. period.
Old 02-17-2009, 08:51 AM
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It's fairly easy to blow flames with EFI...just remove zeroes at high-vaccum, high RPM cells (=engine braking fuel cutoff). Then you can dial as much fire as you like. Questionably cool, but definatly bad for turbo and headers.
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Old 02-17-2009, 08:54 AM
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What's wrong with my car ? . (answer: rear wing and diffusor are missing). With high flow turbos and of course high flow fuel, always when I lift the pedal over 5000rpm (engine revs up to 8500 rpm) flames are reality. Problems: rear bumper looses its paint quite fast, if pushing hard with the friends in the German autobahn at night (street legal as she is), it gets your eyes tired if you're hanging in my ass in high speeds because of continuous flashes. With 343,2 km/h top speed there isn't actually too many cars to suffer that problem for a long time



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Last edited by petri; 02-18-2009 at 10:50 PM..
Old 02-18-2009, 10:46 PM
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Goran, so by how much does this lower the life of the turbo?
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Old 02-18-2009, 10:51 PM
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Because my engine construction is an old mechanical system from 70ies, no can do to change the situation without more electronics included, which I don't want to do the engine running now solid and great. We found out in rally cross racing cars (over 900hp 4wd 935-versions) in 80ies that the flames coming through the turbos are not that bad. If you use tight thermal insulation before the turbo around exhaust lines to keep pressure higher, the heat transformation to turbo destroys the bearings relatively quickly. Probably burning fuel will lift the temperature of the turbo some, so more important is how well your turbo is cooled (to say how fresh air is directed beneath the car). That is the major concern with my rear diffussor design problems rather than engine temperature.
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Old 02-18-2009, 11:09 PM
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Petri your car is a badass firebreathing monster!
I like!
Old 02-18-2009, 11:26 PM
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So what if your turbos are both hanging off the rear end in open air, chances are its not that bad as they're cooled quite well?
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Old 02-18-2009, 11:27 PM
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Thanks, for the comments, search Strosek form here Pelican PArts to read more about this green environmental thing.

Gabriel, in your composition, no problem, because your exhausts are free and not insulated, and your turbos are hanging freely beneath the car. You have to service your turbos sooner probably because of some other reason than flames, when you get your beautiful monster to the stage hit the pedal to the metal
Now back to garage to build some new things for the next season...
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Old 02-19-2009, 01:10 AM
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Thanks Petri - you too keep the shiny side up my friend! I'll be sure to post flame pics once they dial the EFI in for the fuel on let off.

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Old 02-19-2009, 01:37 AM
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