Quote:
Originally Posted by twr7cx
So based on that above, your saying there’s no performance gains, and therefore likely no unnecessary restrictions in the stock headers and cat converter of the OEM system of 2017+ vehicles. the catalytic converter is the restriction in the OEM header, tube size and lenght is pretty good
What about the rest the of the exhaust system post the converter? Has any testing been done to see if the aftermarket sports systems actually reduce any restriction and provide gains? the OEM overpipe wasn't tested, but, it was fairly rubbish looking, a 2.5" was only $100, the only restriction in the OEM front pipe was the 2nd cat when NADid you dyno test your 2.5” system against an OEM setup? Is the cat back different on 2017+ models compared to earlier models? haven't used a pre 17 catback,
According to DSPORTS’s article < https://dsportmag.com/the-tech/scion...programed-ecu/ >, quoted below, the ECU limits further power gain to no more than an additional 5% of the stock power. Do you think that had any effect on your dyno testing without returning for each of the changes? |
Sounds about right, although, adding modifications without tuning will never give best results
95% of power gains, after removing the cats, are in the tuning
Currently the car is running a AVO turbo at 8psi, still using the same 2.5" overpipe, but, have swapped out the front pipe to a SME 2.5" resonated mated to the OEM catback, car made 205kw??? dynopowers
In conclusion, the OEM catback seems to flow fine up to 270ish hp, the only real reason to change it would be for noise at these power levels
Opinions may vary
Edit: your in Hobart, if you have a mate or family in Sydney you can do some testing your self for the cost of a 10 pack >
https://www.ft86club.com/forums/showthread.php?t=136760
Free Mishimoto intake pipe with every Header swapped......