View Full Version : Questions for TDC, or any tuner.
mthurmond
05-18-2006, 06:59 AM
Have you ever tuned a car that is using a J&S Safeguard? If so, what are your thoughts.
On an STI swap, (STI UPPipe, Turbo, TMIC, Intake) is there any safety risk to running the factory downpipe? If not, do you have a canned map for that setup?
IMHO, there would be no benefit to the Safegaurd over the stock knock detection and control system.
mthurmond
05-18-2006, 07:22 AM
The benefits I've heard are: Knock correction on a per cylinder basis, and quicker detection and correction.
CasopoliS
05-18-2006, 07:25 AM
IMHO, there would be no benefit to the Safegaurd over the stock knock detection and control system.
they would not sell any units if this were true. Every car has knock detection, its how the car reacts that is key.... which is where the Safegaurd comes in. BUT... with proper tuning you should be safe (assuming you don't mess with anything after the tune).
TDC Tuning
05-18-2006, 08:34 AM
the factory ecu is smarter than the safegaurd
and does the same thing
CasopoliS
05-18-2006, 08:44 AM
the factory ecu is smarter than the safegaurd
and does the same thing
is that true for all cars? Maybe I am underestimating the subaru ECU. My mazda ECU sucked... maybe why so many engines blew at 8psi....
Well that is good to hear, thanks TDC!
Deer Killer
05-18-2006, 08:48 AM
Subaru thinks their knock sensor is good enough they can use it to compensate for a heatsoaked TMIC, with no idea of how heatsoaked it is. They also explicitly say you may hear audible knock in the owner's manual.*hmmmm*
People sell fuel magnets as well :lol:
That product is excellent for cars that do not have knock sensors. The Legacy's ECU can detect knock on a per cylinder basis.
KGreb
05-18-2006, 08:59 AM
Maybe I am underestimating the subaru ECU. My mazda ECU sucked... maybe why so many engines blew at 8psi....
J&S boxes were pretty popular with the turbo miata crowd for a long time, before stand alone ECUs were available. J&S is a good product, but it was intended for adding forced induction to a car with a normally aspirated ECU. A real ECU that understands a forced induction application is a much better solution.