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Originally Posted by Gary in BR
I am glad its you trying to figure out the WI. It sounds like you are going to get great gains from the research I have read.
Is there so much work involved with the tuning ...get some boost and power increases because the turbos can spool faster. In the 996tt there is a power gain by removing the cats. In a few weeks we will know if a 986tt has the same effect.
If I dont get and power gains and just get some sound back, the turbos have muffled my sound a little. I will be happy with just the sound. I need my car to be a little louder to live up to the sinaster license plate.
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Hey Gary,
So you noticed my quest for the ultimate WI setup (had to join a bunch rice burner forums to get the dope).
Tuning is going to be a little trick. It’s really only as complicated as you want to make it though. Ideally you want about a 13% H2O/meth to fuel ratio throughout the RPM/load range.
I don’t know how critical the actual mix is though. The cheaper setups just turn the spigot wide open at a set RPM/load level (not really where I’m headed). 3 steps up, the H2O/meth is metered with the precision of a PWM/fuel injector (probably overkill but its where I’m at).
The EGT gauge is the best method I think for tuning. If you’re a AFR is good but the exhaust is to hot so is your combustion chamber, so more H2O/meth. If it’s still to hot & you’ve O.D.’d on H2O/meth, tweak the timing back.
I see it only getting really messy when you go over 50/50 H2O/meth mix, then your coolant becomes a fuel too. I think 30/70 is a good mix.
Makes sense on your exhaust since you’ve changed the dynamics so much on the intake side. For a stock, normally aspirated engines though, from what I’ve gleaned, Porsche pretty much has it nailed. A lot of exhaust setups give minuscule improvement at best, some are actually worse. But loud is fun
Be really interested as to how yours works out as I hope to nipping at your heels soon.
Regards,
PK