I've recently installed an evo3 GT along with Evo 560 cc injectors and a 190 walbro pump. Just wondering what you guys thought of my first 3rd gear log so far. This was done at 14 psi with 93 octane gas with a baseline correction of -16% across the board for my high throttle settings on my AFC. The timing curve looks pretty smooth to me, but i read mixed opinions on whether or not the O2 values are important, should i try to get them to around .96?

Also, how much airflow do you guys get at this psi on 16g's..is mine low? And how much does the timing usually dip down to under wot before it starts climbing again?

RPM TIMING AIRFLOW TPS O2
2242 21 0.47 15.72 0
2258 25 3.7 62.48 0.42
2332 23 4.4 100.2 0.92
2422 20 5.19 100.2 0.94
2508 19 5.62 100.2 0.92
2609 19 5.92 100.2 0.92
2719 17 6.64 100.2 0.9
2852 15 7.61 100.2 0.92
2965 12 8.93 100.2 0.92
3113 11 9.9 100.2 0.92
3391 11 11.47 100.2 0.94
3555 11 12.95 100.2 0.94
3852 11 13.63 100.2 0.94
3988 11 14.31 100.2 0.94
3988 12 15.34 100.2 0.94
4387 11 15.83 100.2 0.94
4512 12 16.57 100.2 0.96
4914 14 17.96 100.2 0.96
5172 16 18.76 100.2 0.96
5285 17 18.55 100.2 0.96
5414 17 19.25 100.2 0.96
5656 19 19.86 100.2 0.94
5766 19 19.86 100.2 0.96
6023 20 20.5 100.2 0.94
6148 20 21.18 100.2 0.94
6148 22 21.51 100.2 0.94
6621 22 21.99 100.2 0.94
6727 22 22.07 100.2 0.94
6813 20 22.16 100.2 0.94
6914 22 22.16 100.2 0.94
7090 22 16.28 0 0.68
6109 38 2.93 0 0.68

I wouldn't worry too much about the O2 readings. Everything else looks really good, I think it needs more boost.

What do you think of the timing dip from 22 to 20 at 6813 rpm?

Oh yeah..when you start turning up the boost, do you first add a few % on the afc to every rpm point just to be safe or turn up the boost, log, and then add accordingly?

Do another log if you're worried about the dip, I wouldn't be too concerned with it. Timing was right back up to 22 degrees 100 rpms later.

It probably wouldn't hurt to add a couple % on the SAFC, but I doubt you'll have issues where it is now. Do whatever makes you more comfortable, you can always pull more fuel out on the next run if you need to.

stevew1 said:

Also, how much airflow do you guys get at this psi on 16g's..is mine low? And how much does the timing usually dip down to under wot before it starts climbing again?

Click to expand...

If you can post up your SAFC correction factor at 7k during that run, I can back-calculate your airflow to the actual, unmolested value.

Also, you can drop TPS during the next log and pick up some additional data points. Once you verify that it's reading 100%, there isn't any reason to log it anymore.

My correction so far is just -16% all the way to 7k. The turbo only feels a little stronger than t25..maybe i'm just used to it from turning up the boost so little at a time. Could you show me how you calculate the airflow?

also, is it normal for my timing to drop to 11 and stay there for so long?

stevew1 said:

My correction so far is just -16% all the way to 7k. Could you show me how you calculate the airflow?

Click to expand...

P / (1 -S) = A

Where:

P = Peak airflow displayed on logger
S = SAFC correction factor in decimal form at Ne Point of peak airflow
A = Actual airflow.

So, you are flowing 26.4 lbs/min

stevew1 said:

also, is it normal for my timing to drop to 11 and stay there for so long?

Click to expand...

Not sure what you mean here. I see the timing at 11 degrees at only one point in the log.

stevew1 said:

The turbo only feels a little stronger than t25..maybe i'm just used to it from turning up the boost so little at a time.

Click to expand...

Mathematically, the correction for 560cc injectors is -19%, which puts you at the stock AFR of 9.5:1. So, you should end up leaner than that if you are looking to hit the sweet spot of about 11:1. Either way, I would follow Luke's advice, turn up the boost and then start leaning things out. I'm running similar mods and pushing 22psi on the 16g. I do have larger injectors, so you want to watch your actual airflow and make sure you aren't maxing out any of your fuel system components. You can check their limitations here

550cc @ 100% IDC will support 39.48lbs/min
550cc @ 80% IDC will support 31.58lbs/min

Walboro 190lph

10psi = 46.48lbs/min
11psi = 45.89lbs/min
12psi = 45.26lbs/min
13psi = 44.58lbs/min
14psi = 43.86lbs/min
15psi = 43.09lbs/min
16psi = 42.28lbs/min
17psi = 41.43lbs/min
18psi = 40.54lbs/min
19psi = 39.60lbs/min
20psi = 38.62lbs/min
21psi = 37.60lbs/min
22psi = 36.53lbs/min
23psi = 35.42lbs/min
24psi = 34.26lbs/min
25psi = 33.06lbs/min

Walboro 190lph (Rewired)

10psi = 60.68lbs/min
11psi = 59.85lbs/min
12psi = 59.01lbs/min
13psi = 58.16lbs/min
14psi = 57.29lbs/min
15psi = 56.40lbs/min
16psi = 55.49lbs/min
17psi = 54.57lbs/min
18psi = 53.63lbs/min
19psi = 52.67lbs/min
20psi = 51.70lbs/min
21psi = 50.71lbs/min
22psi = 49.71lbs/min
23psi = 48.68lbs/min
24psi = 47.64lbs/min
25psi = 46.58lbs/min

Check the link for my disclaimers. This reminds me, I really need to rewire my FP.

Thanks for showing me how to calculate the actual airflow. As for the timing dip, I was referring to the timing staying at 11 from 3113 rpm to 3988 rpm. May I also ask how much was your aiflow at for your dyno numbers? and boost setting?

AFR was at 11:1 and boost was set to 17psi. I wasn't unable to log the runs because of the boneheads at the shop, but I won't get into that here.

Anyway, keep in mind, that was done on the stock UICP, no MeOH injection and stock cat back. Right now, I'm flowing about 33 lbs/min but I haven't re-tuned for the MeOH injection yet. I'm waiting to get my O2 bung welded in the DP.

Oh, I edited the previous post with some more information in case you didn't see it.

stevew1 said:

Thanks for showing me how to calculate the actual airflow. As for the timing dip, I was referring to the timing staying at 11 from 3113 rpm to 3988 rpm. May I also ask how much was your aiflow at for your dyno numbers? and boost setting?

Click to expand...

Oops, I'm an idiot.....I didn't even see that.

I wouldn't worry about it since we know you are running rich. You did perform a leak test before you started this right.

Anyway, that's around the area where you should hit full spool, so timing is normally held for a little in that area. Well, at least it always has been in my experience. You get a nice peak of 22 degrees with no pulls, so everything looks fine.

Nice write up in that link. I think i need bigger injectors and a rewire haha. I was wondering how much easier it is to tune with your AEM wideband..

Do you just plug that sensor into the o2 housing and it just tells you your AFR? Maybe I should invest in one.

Well, I haven't gotten mine installed, but that's basically how it works. You need to weld in the supplied O2 bung, wire up the gauge and it will give you the AFR. It also displays Lambda which is nice if you are running something other than gasoline as your fuel. Such as the MeOH I'm adding as fuel. Anyway, pretty good deal for $277.

The AEM also has a 0 - 5V analog output that you can wire up and log with the pocketlogger. You have to cut the rear O2 sensor wire to the ECU and then feed that input with the analog output. The ECU will only "see" a voltage up to 1v, but that gives you the AFR from 10:1 to 12:1, so it's right in the range we need to be in when logging WOT runs. Hopefully I won't get a CEL from cutting the ECU wire. Some people have and some haven't.

As for tuning, it's not necessary to have a WBO2 and I've tuned for a couple years without one, but it is nice. I only sprung for one so I can have realtime feedback in case something goes wrong with the MeOH injection.

Your injectors should be fine, but I would definately rewire that FP. I ran the power wire for mine when I ran all the lines for the MeOH injection, but I haven't gotten a chance to wire it up yet. I was going to do it this weekend, but I have a bachelor party in Atlantic City, so I won't have time.

Alright, thanks for all your help. I will be making more logs at higher boost soon..