Evo 9 - moving from a test pipe back to a cat
A customer came in to get a retune on 91 oct since he moved from a test pipe to a 100 cell cat because the car will be entered into the Redline Time Attack street class which has a cat rule.
Dotted lines are with test pipe, solid lines are with new 100 cell cat:
Didn’t give up much with the 100 cell cat. Lost 5whp and 11wtq. Most of the hp loss is from having to run slightly less boost up top. Had to change the tune a bit as the car got a little grumpy with the 100 cell cat, but at the end there wasn’t much loss!
He also needed a 100 oct track tune so we did that as well.
Last three 100 oct pulls back to back:
2006 Evolution SE
Mods:
GSC S1 Mivec cams
FPgreen with FP actuator
Denso 720cc injectors
Fuel Pump
Nisei upper/lower intercooler pipes
TBE with 100 cell cat
HKS Kansai airbox with HKS ‘flower’ filter
HKS hard intake pipe
Ported exhaust manifold
Tubular 02 housing
GM boost solenoid using ECU controlled boost
GST Custom dyno tune (oem ecu flash)
