load is load. load is determined by how much air is being pulled through the MAF. its not just about your MAF size, its about your intake tubing size. you have to scale the MAF to that size tubing.

something just doesnt seem right here, either your MAF scaling is off, or your load scaling is off

did you self tune your car?

why? he is having 5 counts of knock at 7k rpms. 7-8* timing at 23 lbs of boost seems pretty good and if i were him i would try to lower the timing there to 6* to see if it gets rid of the knock

 

Its running the factory intake pipe and MAF settings. Yea, I'm trying to tune it myself, but even thou it drives fine, I'm sort of getting over it.

 

then i would say you have a boost leak if your doin 300+ load and only pushing 25-26 lbs of boost

 

I get 306 at 25 psi..... I don't think there is any boost leaks lol .

 

I've been told of a 2.3 Airtrek, same turbo and not tuned properly getting just over 320 load, not sure what boost, but wouldn't expect alot due to the tune.

306 load at 25psi, but you have an FP Green and cams.

In any case, I'll be looking at pulling all the pipe work apart and inspecting the intercooler. I'm assuming any leak I would have would have to be pretty small or else the turbo would not get up to 26psi in the first place, which also has me wondering if there is a leak or not.

 

IMO, he's probably knocking from too little timing at that RPM range. He should be around 11-13* at that rpm and load. Just my opinion though.

 

This > your turbo flows more air at the same pressure

that could be true.

 

Thanks guys, I will try increased timing before I pull everything apart. I've dropped a degree or 2 out of the timing and it didn't make any difference, so it may be too low as suggested.

 

yea, i would progress it up to 10* and see how that goes

 

Well, the car felt far better by increasing the timing, I couldn't believe the difference. I increased my max timing by 3 degrees and filtered that down to 1. On the Virtual dyno my power output jumped from about 180kw to 220kw. I still had knock at the higher rpm thou, so I may just need to increase the timing even more. In one run thou I had 6 counts of knock from 5500rpm, timing was at 8 degrees that pull. The next pull it was clean through to 6000rpm with timing of 10 degrees and knock counts of between 2-4 ran through to 7000rpm with timing maxing at 12 degrees.

 

Maybe its because its not an evo but it looks like you are running too rich.

 

I'm guessing he is at sea level where I am 4500 ASL @ 12.7 AP. So its less evident having a slightly bigger turbo.

Greg are you setting your low Oct fuel maps the same as your high ? And have you tried cleaning your maf ? I have heard of people getting knock because of dirty mafs...

Edit: spark plug heat rang ?

 

yea, lean that out to 11.6-11.2 range.

But you don't want to only do 1 pull the see your results, to 3 consecutive pulls then look at your logs so you can see if your AFR's are consistent, if you have any constant/consistent knock and all other variables of your tune

 

yes, do multiple pulls. almost always i will my knock counts will drop over the 2nd/3rd pull.

 

Double post