High knock at wot!

[92tsifwd]

I am getting knock all the time at wot. 3rd gear timing is advanced slowly to 15 deg until 6k and then goes down to 8 gradualy by 7k knock goes from 20 counts at the shift of 3rd and maxes out to 42 counts by 6200rpm and up. injector duty cycle is 79.6% highest at 14psi 91 octane 450cc. Two very small boost leaks at smic and bov flange is my only leaks. I richen it up 10 points across the entire range with my safc2 and the 02 voltage is still .85 and knock is exactly the same. I lean it out 10 points across and knock is the same. and 02 voltage is still .85

Latest run is at 15 psi leaned out 2% across high th and timing was adjusted from 8deg base to 5deg base otherwise the same exact tune on a 20 deg cooler night and this is 2nd gear average of 15 deg timing until 6500 rpm injector duty reached 82.8% highest, knock starts when turbo spools and maxes at 33 by 6200rpm and slowly drops after. 3rd gear pull is as shift into 3rd it goes 13 counts to 36 when rpms fall then it goes to 43 counts by 6k and I let off by 6200 injector duty was 84.3 highest timing was about 8deg and slowly went to 14deg by 5781rpm and then began to drop slowly by 6k down to 12deg. I have checked the knock sencor torque and put a new one in and a new 02 sencor also checked several other stuff. The only things I am limiting this to is I don't have a flex section on my exhaust, and I have a underdrive crank pulley, or the crank sproket over torqued, two small boost leaks, somthing? Walbro 190 needing rewired,

My mods are ballance shafts removed including ballancer sproket, mitsu 4 layer head gaskit, arp head studs, k&n, 2g mass with screw backed out flesh and side honey comes out, 3" intake, 2.5" turbo back with 2.5" o2 housing and external dump, 16g ported 34mm flapper, ported exhaust manifold, udcp, 2.5" uicp, 2" j pipe, walbro 190 not rewired, safc2 I seriously could be making more power. I am confused This knock has always been there sence I have owned this car. and it really has me puzzeled. The strange thing is it does not knock unless your under boost.
I only managed a 14.7 like this Please help

 

[GVR4592]

Before anybody can help you, you have to fix the boost leaks and post a datalog.

 

[92tsifwd]

I already posted the important stuff if you can read my long post. sorry about that. I will try to get a log posted later today.

 

[beatshack]

A log would help alot more, please post a log with RPM, TIMA, KNCK, INJD, TPS, & O2-F (o2 can tell us a lot).

 

[GVR4592]

I already posted the important stuff if you can read my long post. sorry about that. I will try to get a log posted later today.

I read it, but without a log it doesn't help much. Try to fix the boost leaks before you post the log. It's kind of pointless to tune a car with boost leaks, because things will change when they are fixed.

 

[92tsifwd]

Hey I did put in some 119 octane 1 gal of race gas and mixed with 1/16th of 91 octane in the tank. It got rid of 10-13 counts which I believe was real knock. It went down from 43 counts to 30 counts at highest at 15 psi of boost. At 9 psi I only got 3 counts of knock once but not always. Sometimes it hit up to 13 counts at 9 psi. My o2 volts did not really change much when race gas was used. Should they go higher when race gas is used? Timing was actualy pretty good with the race gas not going lower than 18* even with 30 counts of fake knock. At 9psi I hit 32* wot timing with race gas in first gear. I checked everything and it shows rich at wot based on the 7es plugs but the 02 volts only show consistant .82-.85 and .87 with race gas. Please help! I dont have microsoft eccel so I cant post a datalog.

 

[GVR4592]

It's most likely all real knock. I've never posted a datalog but I'm sure you don't need excel. Somebody around here will have an idea on how to do it.

O2 volts are meaningless, they shouldn't change with race gas.

You shouldn't run your tank that low, you're more likely to pick up crap from the bottom of the tank. Mixing race gas and pump gas usually gives inconsistent results.

Did you ever fix your boost leaks?

 

[92tsifwd]

I know it is not real knock because I can richen it up 10% across the entire rpm range and the knock will not even go lower than it is right now. Yes, I fixed all boost leaks. The knock is consistant from 3200 and up which is where I get knock. The knock did not go down after fixing the boost leaks either which leads me to think it is some type of phantom knock. I will post a log the best I can.

 

[92tsifwd]

3rd gear 119 oct mixed

rpm, timing, tps, knock
3343 29* 90.6% 1
3500 27* 92.1% 6
3812 19* 96.0% 10
4093 20* 99.6% 21
4250 15* 99.6% 21
4312 16* 99.6% 20
4500 15* 99.6% 22
4625 15* 99.6% 21
4750 15* 99.6% 20
4968 17* 99.6% 20
5000 18* 99.6% 27
5156 16* 99.6% 26
5218 18* 99.6% 26
5343 18* 99.6% 25
5500 19* 99.6% 25
5625 19* 99.6% 25
5687 21* 99.6% 25
5781 22* 99.6% 25
5875 23* 99.6% 26
5968 24* 99.6% 26
6000 24* 99.6% 26
6125 24* 99.6% 25
6250 24* 99.6% 25
6312 22* 99.6% 24
6375 24* 99.6% 24
6500 22* 99.6% 25
6625 21* 99.6% 24
6718 21* 99.6% 23
6875 21* 99.6% 23
6937 20* 99.6% 22

4th gear

4968 36* 86.3% 3
4968 30* 99.6% 35
5125 12* 99.6% 35
5281 16* 99.6% 34
5312 15* 99.6% 33
5406 18* 99.6% 34
5531 17* 99.6% 34
5625 18* 99.6% 32
5718 19* 99.6% 37
5750 18* 99.6% 37
5750 18* 99.6% 38
5812 19* 99.6% 38
o2's were bouncing back and forth between .83 and .85 on both pulls

 

[GVR4592]

That is some crazy ass timing advance. Have you checked your base timing? You shouldn't be getting that kind of advance, even at 10 psi. What are you using to tune with?

 

[92tsifwd]

I am using a safc2 and palm with 1.8g softwhere and base timing is at 8 deg btdc. I lowered the timing to 5 deg and the car did not run right so I put it back. There is no part throttle knock very seldem it might get some phantom knock but none otherwise. I was wondering if the CAS being 180* off would cause this. Mine has never been removed before but, I might check it anyway. Also how would you test the stock fpr to see if your getting the corect pressure? 190 fuel pump need rewired?

 

[92tsifwd]

91 pump now and 0 knock. It was all from the two boost leaks and rewiring my 190lph pump. I am not sure if it is both but, one of them fixed it and timing is about 24-29 with a dip to 17 when boost hits. I am running 17psi now with no knock. Turns out I only had about 4 counts of real knock last log and I easily got rid of it.

 

[Dred]

I've heard of alot of people having the exact same problem with an external dump. Get rid of it and try it then, does seen like the pk most people are getting where they have to let off the gas then get on it again for it to go away. I'd bet that it's the dump causing it to knock, it's just too much of a coincidence. Just my .02

 

[92tsifwd]

I managed a 14.6000 at 100.89 mph at only 13psi. damn clutch! Just about 4 counts of knock in first gear. I think it is picking up wheel spin or somthing.

 

[dsmsucks]

Man you need some injectors! Just get some 550cc for the 16g.

 

[spyderturbo007]

It was all from the two boost leaks and rewiring my 190lph pump.

It just goes to show that even 2 "small" boost leaks can trash a good tune.

 

[92tsifwd]

Man you need some injectors! Just get some 550cc for the 16g.

Ya, I think actualy I am looking into water injection and a act 2600, fidanza flywheel, and slicks for the near futcher. This is just my DD

 

[dsmsucks]

You should be able to find a good set of 550cc injectors for like 150shipped. I bet that hight knock will go away when you throw them bad boys in!!!