Total timing at WOT

What's everyone's total timing at WOT and redline? Boosted guys especially. I'm seeing 11* on Torque app on 9lb turbo boost, 93 octane ethanol free, and meth injection. I just did the SU1075 knock sensor upgrade hoping to get more timing out of it. I'd like to see it closer to 14-15* which I've seen evidence of through some google searches.

 

16 degrees advanced, 13 psi, ~26 psi MAP, e85, 85 F ambient, 90 F IAT post IC.

11 advance at 10 psi, 91, 90 F IAT.

 

The second set of data, is that 10psi, 91 octane fuel?

 

11 degrees advanced, 7.5 psi, 92 octane. 2nd gen SC with URD 7th injector.

 

10 degrees advanced, ~8-9 psi, 93 octane. Funny I was wondering this same thing. I actually posted a similar question in a T4R thread.

 

I've been reading your post in another thread, but didn't want to jack that thread.

 

Yeah 91 octane

 

I am going to the track tonight and I really would like to spray a little methanol pre compressor. See if the lower AITs will increase timing any whatsoever.

 

From what I've read pre comp doesn't help with detonation much, it increases comp efficiency, basicall shifts the comp map to the right giving you higher mass flow per psi.

 

Well the seals in my meth pump completely went out sometime within the last month. I only figured it out last night while going over pre-race checks. So i fattened the tune up and had fun anyway. Same timing numbers 11.5* at 90* AIT. Nothing groundbreaking to report.

 

I would be doing it for the charge cooling capacity of the methanol. I run around 80/20 meth/water. I wonder if the lower temps give me more timing. I don't want to change the compressor map, maybe injection post compressor, pre maf would be a better idea? I have plenty of spare mafs

 

As far as cooling goes I think post IC is the best place for alcohol injection.

You're running the FIC right? Are you pulling any timing? I recently zeroed my timing map and found it to make partial throttle and spool up/transient response to "feel" much more powerful. Never dynoed anything mind you.

 

After some more searching I'm wondering if there's a difference between and EGR equipped and non EGR truck. I wouldn't think so simply for the fact that EGR only functions at part throttle anyway. My timing table is 0 everywhere. I don't pull any timing. Meth and 93 are all I need.

 

Bumping this up. Curious to see others reply.

 

Bumping this thread, slightly highjacking, And it’s going to be a sort of long post.

I’m one of those with a pingy motor. I’m wondering if it’s a computer thing. Maybe different computers had slightly different tunes? Possibly an emissions thing depending on the state?

Anyway, I’ve added in enough retard to tune the ping out for the most part. However my problem area is the ~2000 area. Looking at my OBD2 scanner I can see the truck wants to run 22-20 advance. Seems a little high to me.

It’s weird though, it “kind of” sounds like ping but it’s kind of hard to make out, it’s not like marbles in a can ping but more of a hard to make out rapid tap noise but only in that area.

What’s everyone else seeing here?


Since you mentioned the SU1075 mod I have this as well.

Here’s a situation I can’t figure out. When I have O/D off and WOT it’ll redline then I guess downshift? When this happens my timing drops to single digits and I can hear what sounds like belt slip. My boost drops only a little maybe .5PSI At the same time my AFRs go to ~10.5 and the only way to stop this is to let off the gas. But I shouldn’t have any belt slip with a new belt, URD supergrip 2.2 and supergrip crank pulley.

Because of all that I’m planning on the GM knock sensor mod. Maybe it’s all sensor related. Anybody have some some insight on this?


Oh and timing at WOT is usually 12 degrees.

 

I just started monitoring timing with my Torque app. As you know from my previous posts I also have a ping happy supercharged 3.4l, with the 7th injector (stock tune). Most of my pinging also happens in the 2000 - 2400 RPM range. 2500k and above I never get any ping, so I have to drive carefully especially when I shift gears to make sure I don't ping before I hit 2500k rpm. Gets old quick lol.

So I've only looked at my timing numbers a few times driving around town to/from work on city streets, so I haven't gotten a chance to look at WOT timing or full boost timing numbers. But at idle I'm at around 15 and when cruising and maybe getting into a couple psi of boost, I'm seeing numbers pretty darn high in the mid 30s. I did do one quick pull and saw the numbers go back to around 12 so I think that's good?

Another thing to note is that it's pretty hot as balls out where I live right now, and from what I've been reading it sounds like intake air temps have a direct effect on timing and how the ECU manages it. My truck definitely has far less pinging issues in the winter when it's colder outside.

I'm interested in this though because I feel like it's finally pointing me in the direction to figure out why I get pinging so badly under 2500 RPM. I'll stay subbed to this thread and report back with more accurate numbers later today or tomorrow. I have to use the freeway tonight so I should be able to get some good readings doing WOT

 

Ill PM you what my timing map looks like so I don’t junk up the thread. I could never find examples of what’s acceptable so it took me forever to finally get it down. I finally emailed split second and they sent me one that I used and modified it a little. I’m still tweaking it and playing with it. I think my belt slip is throwing off my timing though. So until I get that fixed it’ll never be right.

But comparing an automatic to a manual timing, from what I can see, is like comparing apples to oranges. I only see timing that high when I let off the gas.

 

You can have my MAF, it makes mine run nearly 30 advanced at 35mph. At 115 imaginary degrees on AIT all the advance you could ever need...

 

Ah true, yeah I didn't think about the auto - manual discrepancy. I'm having difficulty as well trying to determine what's normal and what isn't, and then figuring out what's normal for boost, etc. Just started digging into this though so if I figure anything out I'll post it up lol.

 

Everything you're saying here is pretty similar to what I see, I think it's fairly normal. At 2k rpm in OD, any throttle input makes it start to ping, especially in hot weather or when the engine is heat soaked. That's a pretty typical high load, low RPM situation that you want to stay out of. You can retard the timing in this area a bunch, I don't know how much that will help though. I hear the same rattley, gurgly, tappy ping that you're describing.

When you have OD off, the torque converter can go into lockup in 3rd gear, which it won't do if OD is on. This is where I do most of my driving, I only use OD if I'm cruising on flat ground or going at least 65. In 3rd gear lockup at 55 mph, I'm at 2500 rpm and it never pings. Timing should be in the 12 degree range, single digits is pretty low but maybe that's not an issue. I also see AFR at around 10.5 - 11.0 at WOT, but the belt never slips. Maybe it just needs to wear in a little?

The knock sensor simply informs the ECU when spark knock is detected and the ECU retards timing to correct, this happens many times per second. That may be the reason you're seeing single digit timing at WOT, but as long as there is enough "slack" in the timing map to allow it to retard to that level, it should be ok.