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Originally Posted by jts1981
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Originally Posted by CarAbuser
I did write a more detailed reply but the forum rejected it.
Basically the 335i and 335is have the same tuning potential.
You can flash a 335i with 335is ROM and it will get overboost.
It's just not something you really want. It's a bit like Turbo mode on intel processors. Just disable it and clock the processor up to it's stable max.
I doubt the Godzilla flash that BuraQ is producing uses overboost at all. All wedge was saying is that they can now manipulate overboost parameters.
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So just to clear things up I asked BuraQ about how over boost works on their tune. Here is his reply;
"Overboost does one primary thing, it adds to Load target which adds more boost and other things. It is more effective in the low-mid end power range. I can dictate how much boost/Load I can add "extra" per gear, similar to what a piggyback can do, by using the overboost table.
Adding too much "extra" load/boost useing the overboost table than "necessary" can lead to performance instability. It has to be tuned for balance.
All N54B30TO cars that are tuned by us the overboost table is utilized in some way or another. So yes my Godzilla map does utilize the overboost table
Lets say I used the main Load Target table to target 160 in a certain RPM range, that gives me 13-14 PSI. I can an add an additional 20 Load in the overboost table to give me 180 load (gross) to bump boost, and other things, up to about 17-18 PSI in the specificied RPM range."
There you have it. Overboost does increase load of regular boost, and it was used on Godzilla.
Good news, don't you agree?  |
So Instead of targeting 160 in the table with a non-is car you target 180.
All the overboost function is doing is making your car target a lower value when it's not active.
You can set the load as high as you like but there's only so much boost the turbo can produce.
The maximum load is the same between both the i and is.