View Single Post
Old 10-28-2008, 03:18 PM   #7
Bad Noodle
Scooby Specialist
 
Member#: 174442
Join Date: Mar 2008
Chapter/Region: Tri-State
Location: NNJ
Vehicle:
2007 SuperWagon
I don't spell well

Default

Advice Column:

It's easier to post feedback here since each post can only have 15000 characters and just withing limitations on every post.

From robbieshonda:
Help with your turbo dynamics burst and continuous tables.
Alot of people get a rapid wastegate flutter. This is a semi legable way to fix this problem.

If your target boost tables is 18 psi for a given cell, and you over shoot that your ecu will pull boost by a given amount in the table. If your car is underboost targets and no knock ect the ecu will add wgdc's to hit the target boost.

You should try taking both of those tables Burst and continuous, and Multiply both by .50 which will cut the table in half.

This will generally help get rid of the rapid over boost under boost wg flutter.

vf series guys this can also help you aswell. yours is like mine, mainly just a weak spring but this will help smooth it out.

Hope this helps Great write up.

Robbie
Cobb Protuner.

---------------------------------------------------------

From williaty:

One thing I will touch on, though, is your section on AFRs. Stoich is not ideal for anything other than emissions. Stoich produces the lowest sum of hydrocarbons and oxides of nitrous. It's not the best for fuel economy (leaner than stoich is) and it's not the best for power (richer than stoich is). The reason that richer than stoich is best for power is that, due to real-world imperfections in charge mixture, running an engine at stoich results in both excess oxygen and fuel in the exhaust stream. This is due to some of the oxygen and some of the fuel not being able to find each other in the combustion chamber. Oxygen is the thing it's hard to get into an engine so we want to be damned sure that we burn every last one of the buggers. To ensure this, we add extra fuel to make sure that none of the oxygen escapes alive. For "normal" engines, this results in Mean Best Torque being somewhere in the ballpark of 13 to 13.5 AFR. Now, many engines, especially forced-induction engines, will have problems with knock at that AFR. By further enriching the mixture, the efficiency of the combustion can be reduced to the point that knock is easier to control. Make sure you read that carefully, though. The increased resistance to knock is a result of reduced efficiency. So over-enrichment (richer than 12.5 or so) costs both fuel efficiency and power. However, it allows for higher boost and/or more timing. It's a trade off and different tuners will prioritize different aspects of that trade off. In the end, most theories on that compromise will end up making roughly the same power, just in different ways.

----------------------------------------------------------------------------------------------------
* Registered users of the site do not see these ads.

Last edited by Bad Noodle; 10-29-2008 at 06:52 AM.
Bad Noodle is offline   Reply With Quote