8th gen power loss after tune

[mitchellgarden]

I have a 2009 si sedan that is stock aside from a hybrid racing cai megan racing header and skunk2 cat back. I set a base tune but now I have lost power and run lean. What do I do?

[EFICU]

You need to have it all tuned for your specific vehicle. The basemaps are just a start, they all need to be adjusted for your car.

I’ve tuned plenty of 8th gens with HR intakes. If you want some help tuning it just let me know.

[mitchellgarden]

Any help would be appreciated. I got in touch with a tuner in my area yesterday but haven’t heard back from him. And I’m new to the Flashpro and to tuning

[EFICU]

No problem. We can get it sorted for you, it's most likely just a series of small parts of the tune being off that add up to one large issue.

Take the attached file for a 20-30 drive with as much stop and go type signal light to signal light driving as you can. Try to avoid steady cruising speeds for long periods of time at least. On the drive, make a couple of wide open throttle (WOT) pulls from 2000-8600rpms in third gear as well so we can see how the WOT fueling looks.

Let me know if you have any questions. Try to make the datalog as soon as possible and post it back up on here so I can make the necessary changes quickly for you. It will take a few revisions to get it dialed, but get the first one back to me quickly so I can clean up any big chunks right away.

GardenM.SD.Rev01.fpcal

[mitchellgarden]

Ok i will work on that now. Thank you

[EFICU]

Sounds good. We’ll see how it looks.

[mitchellgarden]

This is without the tune you sent. We'll load up yours and do yours also.

[mitchellgarden]

Here's the datalog with your tune. Car runs great compared to what it did. Really appreciate the help!

[EFICU]

Hi Mitchell,

Yeah your car was insanely lean before on the old file. 20-35% lean fuel trims on part throttle, and over 20-30% lean on the WOT fueling which is very bad. It's a good thing you didn't continue to keep driving on it. Below is an overlay of your WOT AFR vs an ideal 8th gen AFR, so you can see what you were feeling. Yours is the red, the other line is more what we we're aiming for.

AFR COmparison.JPG

The datalog with my file is saved as a calibration. We need to save it as a datalog so I can see how it's running on my file so I can make revisions for you. Re-save the new datalog as a normal datalog file and then post it on here. I'll get you the next revision once I see the new datalog.

[mitchellgarden]

Sorry. Here's the new one

[EFICU]

The new file looks really good. The part throttle fueling looks great, the WOT fueling needed a little bit of fuel added, but nothing major.

Here is the next one for you. Make another datalog like you did in that last one and we'll see how it looks.

[mitchellgarden]

man you have no idea how much i appreciate the help the car runs amazing.

[mitchellgarden]

i do have another question. we have been doing this with my baffle in. will it change a lot if i take the baffle out?

[EFICU]

No it shouldn't change much, if at all. You can always run a datalog without it once we get it dialed. Then we can compare. But it shouldn’t change the flow enough to disrupt the tune.

[mitchellgarden]

Ok good deal. That’s sounds like a good idea.