Hey everyone, this is my first time logging a third gear pull and I had a quick question. Here is my log and I wanted to know why my boost hits to about 47 psi under WOT. Is this because my ecu isn't controlling it anymore? I do have a manual boost controller. Let me know what you think! Thank you!


EvoScanDataLog_2009.09.28_22.12.23.csv

 

From what I know about logging which isn't a whole lot but I can do logs sucessfully, you are looking at a column that isn't really boost psi - you need a JDM 3 -bar boost sensor and the column logged would be JDMMAP - that is true boost at the manifold.

 

What he said. OP, looks like you are confusing your MAP column with the JDMMAP column. You need to get a a 3 or above bar sensor (JDM, Evo X, Omni) and configure it to log boost to tell what boost you are really running.

 

Alright that makes sense but is it alright if I leave it like that since I have a boost gauge? I don't really need the 3 bar map sensor I believe. Thank you.

 

Whats your boost gauge reading??? i dont think the stock turbo will even hit 47psi but if it did you will know, prob be holding on for your life. That thing would pull like crazy

 

I am on stock boost currently. My gauge reads 20 psi. I don't have a wideband yet which I really need to get. I am just currently trying to get a grasp of everything that is being logged. I know my AFRs (if they are accurate in EvoScan without a WB) get as low as 9.7 under WOT.

 

Get the WB and some sort of map sensor. That way you will be able to do maptracer (or excel) and tune very accurately. The good thing about the map sensor is you can see peaks and valleys in your boost curve and can adjust the WGDC to smooth it out.

 

So I do need a map sensor? I like excel and how it puts everything together in a table format but I haven't tried maptracer yet. Question...what is WGDC? I am going to try to get an AEM 3.5 bar sensor soon along with a wideband.

 

Wastegate Duty Cycle. The map sensor isn't what you call "mandatory", but HIGHLY recommended, especially once you start turning up the wick.

 

If I had to do it all over again, I would get a wideband O2 sensor and MAP sensor as one of my first few mods (along with the Tactrix cable, EvoScan, and a boost gauge). The amount of information you can gather using the above setup is unbeatable as far as gaining knowledge about the car as well as tuning it to perform better.

 

+1. Not to mention, with the map sensor, you can dial in any kind of taper you want, or keep the boost line straight. I somewhat recall my previous statement. "They" should sell a tuning kit that comes with those items.

 

Zeitronix sells a monitoring/logging solution that allows you to display & log AFR, boost & EGT simultaneously using their own software, or you can also import it into EvoScan to log in conjunction with all your other params.

 

I am curious about your statement. Can you specify why?

I would get the Zeitronix kit but it is a little too expensive. I am a college student on a budget so I am going to have to look around for some good deals. In the near future I was thinking about buying their E-85 content analyzer for when I go green.

 

WGDC is wastegate duty cycle. Duty cycle is represented as a percentage. 100% being roughly equivalent to wide open, and 0% would be roughly equivalent to closed. It's never quite that simple with solenoid valves. You'll also discover that while you can scale numbers 0-100% in duty cycle, the boost response won't follow linearly. Duty cycle control of solenoid valves is not an automotive specific application, you can google/wikipedia this and learn quite a bit.

The best thing you can do, as was mentioned above is to get yourself a wideband o2 setup. The NGK setup is extremely reasonably priced for example. While you don't really need a MAP sensor, it's a great tool to have. The best one available for the EVO VIII-IX right now in my opinion is the OMNI 4bar. It can be had for roughly $125 shipped, and is a direct plug in to the factory harness. A few tables in ecuflash need to be changed, and you're in business. There is a thread on here with all the details, and several vendors offering it for sale. I got mine from Tony at t1raceparts.com located in the suburbs of Dallas, TX.

Above all, read the threads in here. Honestly the organization in the forums here is nonexistent, you just need to read the threads and learn the concepts and the details. Don't feel bad if you don't have a clue what half of it means, most of the people on here don't either. What sets people apart are those with the patience to use the search button and figure it out themselves, or post and ask some intelligent questions.

 

What he said. Take your time and save up if necessary and get a good wideband that EvoScan can log to see what your AFRs really look like. Then getting a MAP sensor of some sort will allow you to accurately log boost as well (and later on as noted you can extend this and use it control boost too ). The gauges are good for eyeballing, but not very helpful for when you are at home with the log and wanted to know what the boost was at exactly 4765rpm .