Hey guys i just bought a civic with a built d16 turbo engine with the common vitara setup, its been running fine but the manifold was cracked badly and blowed like hell also looked like a 10year old welded the manifold so the quality is s*it. im not a bad welder and considering making a new manifold myself, but the flow will look a bit different, my question is does the ECU needs reprogramming with a different manifold?
You probably will be fine really. probably not much difference unless its radically different manifold deisgn or shape, and that may only change the spool rpm. If you have a wide band o2 id just watch that..
If you made no changes to the fuel maps and you see leaner numbers you will make power with a tune. If the wide band says richer numbers you have lost power
If your wide band says the same. Then the motor is flowing the same and tune wont help anything
Update: now i installed a new exhaust manifold, the following problem occurs: since now there's no exhaust leak the turbo spins more freely, when i floor the gas pedal at 3rd gear around 4k rpm i get a boost cut because the turbo want to overboost, my aem uego ufr was reading nothing (only the 3 red - - - so there was something wrong, i turned down the boost on the manual controller (cheap ebay) car runs fine there's no overboost cut at all but my afr doesn't work anymore, its just stuck at 14.7 which probably means the sensor is gone. Can i still safely use the car with the bad afr?
To see if it is actually running lean instead of a bad sensor, just pop a coupler off the intercooler. It should run way differently, and the sensor should indicate as such.
If the sensor still continues to say lean, drive it gently until a new sensor is installed.
Most AEM UEGO sensors do respond to a new calibration, so follow the instructions AEM has available!
Another option, though ghetto, is to remove the wastegate gasket, reinstall the wastegate (assuming it is external) and let it make that horrible leaky sound once again until you hit your tuner up.
also i forgot to tell in my update comment, after the manifold swap the car was running great for about 30minutes, and that was a full throttle run without mercy, the hard 2step launches could have killed the sensor and caused the car to cut the boost as it was reading bad signals, anyway new sensor is ordered, after fitting the new sensor i will update again if problem still there or not
Wide band O2s do not last very long, especially daily driving.
I would change mine about once a year maybe two years. It would start reading completely wrong at times.
PLX with a VW wideband.
Update: The car started to smoke badly on higher rpm, checked my turbo for play it have an accceptable side to side play but it has also in and out play which means bad. is it worth to rebuild a gt2871r turbo or just better get a new one?
Update: The turbo has knackered, it wont even boost anymore and bearing makes weird noises so its time for a new turbo, i just bought a copy gt2871r from ebay "i know its not the best idea" but i just want to sell the car now, will the car need re programming if turbo is swapped? is the copy turbo makes a lot of changes compared to the genuine garrett?
Well it will tell you if you have more or less air flowing into the motor. If its lean you have more air and yes your timing may need to be pulled some depending on how much more power you are making. If its rich there is less air and may even be able to use more timing
Okay, will update back when installed the new turbo, also i realized the turbo i bought it says Oil/water cooled, my garrett never had a water line installed, is it okay to just block the water line on the new turbo? or is a must to use it.
It will help the turbo out the most directly after engine shutdown, when temps tend to skyrocket for a short time since the waterpump isnt flowing.
You can cheat a little bit, and unhook one coolant hose from your idle valve, run a line to and from the turbo, and hook back up. Just simply having the turbo inline with coolant will help overall.
im stuck with oil fitting to the new turbo, im not sure if i need to use an oil restrictor for the new turbo?i know garrett requires oil restrictor since its a ball bearing turbo, but im pretty sure this gt28 clone uses journal bearings.
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