turbo/supercharging - turbo sounds!

[William A. Sarkozy]

At 09:09 PM 3/23/97 -0400, you wrote:
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>As previously stated I've got a twin turbo 302. Reading all this about the
>sounds makes me smile! My car with hi-flo cats, 2.5 inch exhaust, and 2
>chamber Flowmasters or my current Dynomax exhaust is quieter (!) than
>stock. I've raced it many times and the best experience was when a friend
>who'd been backpeddling the car jumped on it at the end to win the race.
>Guy he beat swore we ran nitrous and we had to let him examine the whole
>car - even under the hood. He found no bottle but when we opened the hood
>he swore a blue streak! The car is seriously quiet and even the turbine
>noise is pretty quiet. The Bosche bypass valve (from a Porsche - $50 and
>same as Vortechs $99 valve!) makes a sound like a sneeze or soda bottle
>opening and few people know what it is. I've been asked to rev the engine
>and do all sorts of stuff by people who can't figure out where the blower
>is - I love it. Darn turbos are buried under so much junk you can hardly
>see them with the hood opened. If a 351W fits it's going to be a monster!
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>As for NOT running mufflers - that would be hard. The car gets a serious
>base rumble and wasn't really comfortable this way when I tried it. I'd
>keep some sort of muffler on it but it can be seriously free flowing. You
>want as little backpressure there as possible...
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>To keep this on a DIY bent. I'm running a DFI and would love to hear from
>anyone who's found good ways of analyzing the data dumps and maps. In
>particular I'm thinking of "eavesdroping" on the comm line between
>precessor and box to try and figure out the control codes and such. I'd
>love to find ways of manipulating the data out of the DFI...
>
>jvp at qsi.com
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>I'm missing something here.  I've read a few threads where pepople have
talked about analyzing the data from their DFI units.  Particularly getting
it into MS Excel or some other spreadsheet.  Why is this done and what are
the benefits?  I run a twin turbo 377 Chevy with DFI unit in my flat-bottom
boat and once I had it set up on the dyno, I don't feel the need to fiddle
with it.  I adjusted the fuel and ignition map to keep the motor from
rattling and also keep the EGT in line and haven't adjusted in since.

                                                                            
                    Bill