Another day another correction by us due to the stupidity and incompetence of another shop. The problem with these exhaust shops is that none of these morons know how an engine works. Watching the 4 stroke cycle in slow motion doesn’t make you an engineer, much less understand what firing order is or air fuel ratio.
Such is the misfortune of this Lancer EX who has the WRONG header design installed on his car. Note to exhaust shop, you’re suppose to pair 1-4 and 2-3 if you’re going to create a 4-2-1 header, NOT 1-2 and 3-4.
Not that is matters because the Lancer EX MUST have a 4-1 header design in order for the oxygen sensor to work and read properly. Splitting and pairing the exhaust the wrong way cause wrong readings and sure enough, when we put it on the Dyno, the air fuel ratio is in the 16:1 region, way too lean and also why it keeps throwing a check engine.
Left to right: Stock header, Dumb exhaust header, Hotpipes headers
Another mistake of the Dumb exhaust header is the lack of a flexible section to isolate engine vibration from the chassis, which led to the muffler vibrating wildly, Never mind that 2 of the 3 exhaust hangers are also missing.
On top of all, it’s just our luck that the ECU stopped communicating with the ETACS body module, no doubt due to the other shop not removing the battery while welding the muffler.
So after fixing the ECU, we asked for the stock exhaust components back, header, muffler, midpipe so that it will make trouble shooting easier. Once everything was up and running, we proceeded to do a baseline reading with the stock headers and exhaust, and it got us 110whp, which is the correct power figure for the 1.6L Lancer MT.
For shits and giggles, we put back Dumb exhaust’s header and dynoed again. Lo and behold! A big fat ZERO HORSEPOWER gain.
I really have no words. Ok maybe I do and they are F%#^ S%#* A$$¥}+?$ M@%@^
Putting our Hotpipes headers and what do you know? Instant 10hp gain without doing no nothing!
Well his aim was to have the car tuned because Dumb exhaust told him to do so in order to get rid of the check engine light.
Uh news flash asshole, the engine light is because of tuning, it’s because your work is a piece of dog shit.
So tune with Unichip we did and final power output is 140whp, up from 110whp stock.
Thin red line – Dumb Exhaust header
Thick red line – Stock header
Purple line – Hotpipes headers
Dark blue line – Unichip tuning
So yes, 30hp gain, no check engine, correct air fuel ratio and Hindi Malakas sa gas. All the things you want in a car.