Car is an '03 VIII. Mods are K&N drop in, Ebay catless tbe, mbc set to 22psi. No other modifications. Am I ok until I get a pump? Any input will be greatly appreciated. Thanks,

Robert

 

bump

 

First, we do not know your AFR, so you might be running lean or rich. We simply do not know. So we cannot comment on that one.

Second, you have 6 counts of knock @ 6875 rpm and that is pulling 2 degrees of timing and decrementing your octane flag.

IMO, to solve the knock you should pull 2 degrees of timing from 6500 rpm to cutoff.

 

I realize I need to get a wideband to keep track of that. Thank you for the input. Allthough I made the pull to around 7k, I usually shift at 6500-6700rpms. Can I stretch my shift points a little further and cut some timing or should I leave it the way it is and keep shifting at 6500?

 

I just did your IDC from the injector pulse width and rpm and you are running out of fuel up top. You are hitting 100% right where the car starts knocking. By 7200 rpm your IDC is @ 108%. That is your problem. You need a Walbro 255 ASAP. I would stop all WOT activity on your car and get a Walbro installed.

 

Quite a few people are running IDCs up to 110%. The injector scaling used by the Evo ROM is 513 cc/min, but stock injectors are 560 cc/min. Thus 110% IDC calculated from IPW in EvoScan is actually about 100% IDC. Keep in mind that the guy probably still has lean spool disable set to 7000 rpm, and the IDCs will take a jump past 7000 rpm. What IDC values are you calculating before 7000 rpm?

 

I did not save the log after I did the calculation, so I do not know. I still would not run that high of an IDC. On my 8 the current IDC in not more than 90% @ 7400 rpm. Personally, I would not want to see IDC higher than 90%.

 

Whether they know it or not, pretty much every person with an Evo 9 that has just a TBE and a tune is running 95-105% IDC (according to EvoScan) just before hitting 7000 rpm at WOT.

 

Your timing is about as high as you would want to go on pump (or W/M, racegas, 110 for that matter). Looks like your about at 250 at the wheels - about par for VII with those bolt-ons

No knock, so good to go

 

You did not scroll down in the log. The car has 6 counts of knock.

 

I realize the car is running on the edge of being too lean based just on plugs, but on my second question if I usually shift at 6500rpm when wot I am still safe? Or shoud I take is closer to 7K and take a couple degrees of timing out?

 

This statement confuses me. IDC is high if your AFR is rich, it is low if your AFR is lean. When you tune an Evo, you lean the high end of the rpm since stock it runs very rich. I logged an Evo 9 with a TBE w/o a tune and its average AFR @ 7000 was 10.3:1. By 7500 it was @ 10.2:1. That made for a high 95% IDC. Since you are going to lean the car when you tune to about 10.9:1 @ 7000 rpm, then your IDC should go down and not up.

I bet that if this car that I logged gets tuned and its AFR is leaned, its IDC would fall to 90%.

 

Please answer question above...^^^^^^

 

I think you know that IDC itself isn't an indication of lean/rich but only that its an indication how much the injectors are working. In this guy's case, I'm just saying that if you are looking at IDC as a means to see whether the injectors are maxed out and causing a lean condition, then 1) calc the IDC from the data before 7000 rpm (before lean spool disable), and 2) keep in mind that a stock injector is maxed out when the IDC as calculated from EvoScan data reaches about 110%.

 

From what nj is saying whether your shifting at 6500 or 7000 you have an issue that needs to be resolved. this is like asking if you should give up smoking when you need your leg sewed back on.

From the way the log is reading, your modis operendi (oh whatever) should go like this:

1. Get a WBo2.
2. Lean Out to reduce IDC.
3. Get a Walbro and Retune to further reduce IDC.

But no matter what, you should take it easy on the car right now.