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Old 05-09-2019, 12:08 PM   #1 (permalink)
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Default Re programming after manifold swap?

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?

Thanks in advance
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Old 05-09-2019, 12:41 PM   #2 (permalink)
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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
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Old 05-09-2019, 12:46 PM   #3 (permalink)
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thx for the quick answer, yes i have AEM uego wideband fitted, I will try to make the similar shape manifold as it was on before
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Old 05-09-2019, 01:48 PM   #4 (permalink)
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I'm assuming exhaust manifold? (EDIT: Didn't see your reply about the wideband)

Either way I don't think it would matter much on the intake or exhaust unless they were dramatically different designs Like Evan stated above.

The question now is what style did you have and what style are you planing on replicating?

Are you a good enough fabricator that you feel you could take the job on?
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Old 05-16-2019, 01:11 PM   #5 (permalink)
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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?
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Old 05-16-2019, 03:10 PM   #6 (permalink)
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Quote:
Originally Posted by try_all View Post
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?
Really depends on your fuel maps. I wouldn't risk it, it's running lean you could be in a world of hurt very quickly.
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Old 05-16-2019, 03:23 PM   #7 (permalink)
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Agree^

Can you try recalibration the sensor?
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Old 05-16-2019, 04:51 PM   #8 (permalink)
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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.
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Old 05-17-2019, 03:55 AM   #9 (permalink)
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i took the o2 sensor out and did the break cleaner in the rag trick, it stayed on 14.7 didn't moved anywhere, im 99% sure that my sensor is crap
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Old 05-17-2019, 12:53 PM   #10 (permalink)
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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
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Old 05-17-2019, 02:45 PM   #11 (permalink)
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Never heard of the brake cleaner and rag thing.

Perform the re-calibration and post back.

Dont do backyard tricks before proper diagnostics when they are available.

brake cleaner itself can kill the sensor quite easily.
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Old 05-18-2019, 09:54 AM   #12 (permalink)
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This is the test i have done,
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Old 05-18-2019, 01:16 PM   #13 (permalink)
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That test actually looks great.

I guess in my head I was picturing a rag dripping with brake cleaner being wrapped around the sensor.

Looks like you diagnosed it correctly.

Does AEM have any sort of warranty on their sensors? maybe they will cover the new sensor you are waiting on.
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Old 05-21-2019, 11:10 AM   #14 (permalink)
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swapped the sensor and problem solved
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Old 05-23-2019, 06:25 PM   #15 (permalink)
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How does your AFR look now under boost? Any dramatic changes? Going back to the original topic of how much did it change.
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Old 05-24-2019, 05:22 AM   #16 (permalink)
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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.
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Old 05-25-2019, 09:19 AM   #17 (permalink)
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Quote:
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How does your AFR look now under boost? Any dramatic changes? Going back to the original topic of how much did it change.
no dramatic changes under full boost its around 12 and 12.1
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Old 06-01-2019, 02:12 PM   #18 (permalink)
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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?
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Old 06-01-2019, 02:29 PM   #19 (permalink)
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call up https://gpopshop.com/ and get some pricing for a rebuild kit or rebuilt turbo. they re-built mine
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Old 06-01-2019, 03:25 PM   #20 (permalink)
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smoking at high rpm can be a ton of things.

Sometimes with turbo builds it can simply be the turbo getting too much oil pressure.

I would make sure the motor itself isnt smoking from bad piston rings or valvetrain seals first before pointing finger at turbo
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