Help with a tune for a 2008 Acura CSX Type S

[Moist]

Hey so basically I just acquired this car very recently and the previous owner installed a Hybrid Racing Intake which requires a MAP tune. Also I know the CSX type S uses a different exhaust then a standard civic si which makes it harder for me to figure out. The previous owner flashed a tune but it has a code P0171 lean on bank 1. I am new to this whole thing and I am wondering where I should begin. Thanks

Car is basically stock except the Hybrid Racing Intake.

[EFICU]

Yeah the intake will be your main focus for getting the tune right moving forward. The exhaust won't make enough of a difference to throw you off too much. It might flow more, but not enough to make a drastic change over the USDM Civic Si. If you are getting the lean back one code, I would bet you are running on a MAF tune and that is the problem. If not, someone made some bad adjustments to the tune that is in it. I would have to see a datalog and your calibration you're driving on. Though since the previous owner installed the calibration, I am guessing you don't know which one is in the car?

I would recommend not doing any wide open throttle (WOT) pulls in the car until you get the tune cleaned up. Part throttle the ECU can control the fuel trims to keep it inline, but WOT it cannot and that is most likely why you are getting that code. It's very easy to clean up the tune, so if you want some help with it just let me know.

Do you have future plans for more mods? If so, how far down the road do you plan to add anything? I ask because there are two ways to tune these, one is more time consuming than the other. So if we go the long route, then you change things in a month, that wouldn't make sense. If you plan to run just the intake for a while then tuning it the long route would make more sense. Let me know your plans, and let me know if you have any questions. Either way, it's very easy to tune your car with the Hybrid intake, so don't stress about it.

[Moist]

Hey I appreciate you taking the time to help me!

Glad to hear the exhaust won't have any affect. Unfortunately I don't have any data or any information on what tune was used as the hondata is cleared. Would it be best to start fresh with a tune that works with this intake?

As for the mod question I probably won't add anything to the car for a year or 2 to be honest but I will say definitely nothing for a year minimum.

Thanks

[Moist]

I guess the only thing I am replacing soon but haven't ordered yet is the spark plugs other wise nothing else. Was going to get the NGK Laser Iridium. Not sure if that would affect tuning?

[EFICU]

Hey I appreciate you taking the time to help me!

Glad to hear the exhaust won't have any affect. Unfortunately I don't have any data or any information on what tune was used as the hondata is cleared. Would it be best to start fresh with a tune that works with this intake?

As for the mod question I probably won't add anything to the car for a year or 2 to be honest but I will say definitely nothing for a year minimum.

Thanks

No problem. Yeah if you plan to keep it as an intake only for a while then, I would recommend tuning it properly by going cam angle by cam angle, then blending everything out. That would give us the most data to build you a proper cam angle map for your car. Plus it's just a better way to do it. It used to take longer, but I have come up with a plan on how to get it done quicker but with all the detail. Basically it would take about 10 revisions or so, which you would be making 20 minute datalogs for each one. Do you have time to make datalogs, or is this something you really need to get done in 2 or 3 revisions?

I guess the only thing I am replacing soon but haven't ordered yet is the spark plugs other wise nothing else. Was going to get the NGK Laser Iridium. Not sure if that would affect tuning?

Spark plugs won't impact the tune, especially when gapped properly. So be sure to gap them to spec and you should be fine. I just wanted to make sure you didn't plan to put a header on in a month, which we would then have to retune it to get the most out of it. Especially if you're strapped for time, I would want to use your time wisely.

Let me know what you think and I will get you the first file right away so the lean condition will go away. If you have questions, let me know.

[Moist]

Yeah I am in no rush and would like to see it to the end. As I am not planning any major engine modifications so getting it reliable would be great! I appreciate it!

[EFICU]

Yeah I am in no rush and would like to see it to the end. As I am not planning any major engine modifications so getting it reliable would be great! I appreciate it!

Okay sounds good. Here is the first file for you. This is the 0* cam angle with vtec at 5500. For our datalogs, we need them to be in the 20 minute range, longer is fine, with stop and go type driving. Basically avoid long lengths of time at steady speed or cruise control on. While on the drive, make one wide open throttle (WOT) pull in third gear from 2500-8600 rpms so we can see the WOT fueling. Only make one WOT pull in these first few datalogs until I get the fuel lined out. Then you can have more fun with it. So 20 minutes, one WOT pull in third gear from 2500-8600, then we'll see how it looks.

What octane are you running, 91 or what?

Moist.SD.Rev01 (0Cam)(Vtec5400).fpcal

[Moist]

Ok thanks I will follow your instructions. And I use 91 for fuel. I will get you these datalogs soon here.

[Moist]

Ok so here is the first data hopefully this should be sufficient data for the first log here. Tried to do exactly what you said so hopefully it should be good. Let me know if there is anything you want me to change with the driving. Did the one WOT 3rd gear pull. Also I guess if I had to be more specific with fueling just in case you wanted to know I am using shell 91. Code is gone and car is feeling better than before in terms of idle and driving haha.

Thanks!

[EFICU]

Ok so here is the first data hopefully this should be sufficient data for the first log here. Tried to do exactly what you said so hopefully it should be good. Let me know if there is anything you want me to change with the driving. Did the one WOT 3rd gear pull. Also I guess if I had to be more specific with fueling just in case you wanted to know I am using shell 91. Code is gone and car is feeling better than before in terms of idle and driving haha.

Thanks!

Datalog driving was perfect man, that is exactly what we need. After looking at the datalog, it appears the primary oxygen sensor has failed. I'll have you do one more test to see. But the AFR goes very lean above 4000rpm, so lean that it's got to be something mechanical with the car. Most common issue of failure I've come across in scenarios like this is the primary o2 sensor. I verified injector duty cycle with other cars with similar mods, and your duty cycle is the same. So it's not lean, but the o2 sensor is reading as such.

In this next datalog, all I need you to do is a WOT pull in third gear from 2500-5500 rpms. I added the fuel as needed according to the datalog, but I am sure the AFR will still be lean. So we just need to test that. If it stays lean, we need to get a new o2 sensor from the dealer, or a high quality OEM equivalent like Bosch or something. We just wouldn't want an Amazon no name sensor basically, as it's an important part.

Are you sure the main cat pipe is stock? Nothing is modified on the exhaust correct? If something is modified it could be poor o2 placement, but the way it's reading leads me to believe it's the primary o2.

Anyways, here is the next test revision. As mentioned, just need a third gear WOT pull from 2500-5500. Don't do anything higher than 5500 as we're just testing to see what we get with the added fuel. No need to do a 20minute datalog either, just load this revision and take it out for just a third gear WOT pull from 2500-5500.

Moist.SD.Rev01.1 (0Cam)(Vtec5400)(FuelTest).fpcal

[Moist]

Hmm thats odd haha I will take a closer look as I can't exactly tell. If that's the case I will get a O2 sensor after this data log if needed. I might take another look in the engine bay to confirm but it should hopefully be stock. I will go and do this pull here. Thanks

[Moist]

Ok so here is the next datalog. Hopefully it read better this time haha.

[Moist]

I looked at the the bottom and looks stock at least compared to what I can see on the limited pictures of this car haha

[EFICU]

Ok so here is the next datalog. Hopefully it read better this time haha.

Okay it's definitely is still showing lean in the datalog. Injector duty is up 8%, and the fuel is even leaner than before. So I would start with getting a quality o2 sensor and let's go from there. It could be another issue, but from the data I can see in datalogs I would start with the sensor. That's good it looks stock. Here is a how to on the header, image #5 shows the cat for reference. https://guides.hybrid-racing.com/Guide/ ... vic+Si)/32 The o2 sensor we're replacing is the bank one sensor that is in the pipe too.

The sensor works fine in part throttle, so you can drive it around with no issues, but don't do any WOT pulls or anything until we get the sensor replaced just to be safe. Once you get the sensor in, let me know. Then we'll have you make that same pull from 2500-5500 to inspect. If that looks good, we'll go from there.

Keep me in the loop, if you have any questions just let me know.

[Moist]

Ok no problem! So should I grab a stock unit tomorrow from Acura/Honda or should I just order the bosch you were talking about?