Quote:
Originally Posted by anarchyperf
Most people that have "had issues" with JWT really just had other non tune related problems with their car and blame it on the tune
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I am glad to see this is true on every continent of our planet.
Most people asking for a tune have at least one problem with their car. But they think a tune will magically solve everything.
The bad news is, it does not.
Most of the time, problems are due to boost leak, dying fuel pump, dead sparks, tired /low compression engines, badly set CAS, timing belt out ... it usually is a combination.
But the OEM mapping is very conservative for that exact reason : if the car has running problems, it will still be ok. While it will surely break with a perfomance mapping. for example, oem fuel maps are usually commanding a 9:1 to 10:1 AFR.
Which is pig rich. But if the fuel system is degraded, it will just run 12:1 to 13:1. and the user wont even see it.
But then, when he installs a chip, the chip commands a good value of 12:1. If the fuel pump cant supply and injectors are a bit clogged, you will get 14:1 or 15:1 on boost. And then pistons melt.
Same goes for the timing ... the oem map is so conservative it does not matter if the CAS is set with 3-5 more degrees. But a performance tune will use an optimal / bit conservative value, which will make holes in pistons if you just add these 3 to 5 more degrees.