853mV & 3.8º of KR

[Vendor Defendor]

well, finally got the alky working and my boost controller in, so i take the baby out, i have it set to ~23-24psi. (weeee) and i and the first pull i had like 863mV and 19.3º KR, but i figured that was false knock since i was soooo rich. then next pull same thing 840mV and 7.2º KR then the last run, it did 853mV and 3.8º KR...

i figure since i am so rich it cant be real Knock... but what can you tell me about this?

thanks

 

[azgn]

do not live and die by 02 readings....get rid of the knock

24 lbs of boost seems high on basically 100 octane fuel, particulary since you just installed the alky.....work the boost up slowly and don't tolerate any knock

 

[Sinful6]

Neil, What is your turn-on PSI, and pump speed? Are you using an SMC kit? Tuning alky can get tricky at times. I suggest that you ditch looking at O2 mV, and focus on tuning for EGT's instead. You will get a much better/safer tune this way. On a side-note, how do you like the boost controller?



-DC

 

[Steve Wood]

turn the boost down and see if the knock goes away. Just because someone else posted they ran 24# does not mean you can.

 

[DJay]

I run 20# w. NO kr.

If I see it last more than a second above 1.0 I let off and try to see what the problem is.

 

[Vendor Defendor]

Originally posted by Sinful6
Neil, What is your turn-on PSI, and pump speed? Are you using an SMC kit? Tuning alky can get tricky at times. I suggest that you ditch looking at O2 mV, and focus on tuning for EGT's instead. You will get a much better/safer tune this way. On a side-note, how do you like the boost controller?



-DC

on time is 10-12, that needle starts to rise real fast, to quick for me to tell exactly, pump speed is at 10 right now, yes its teh SMC kit...

the boost controller is nice, i am going to have to mess with it a little more tomorrow to see whats going on...

thanks

oh yeah, i forgot to add that my plugs are NGK UR5's, and they are gaped @.035 some one said to take them down to .032 would that help any?

 

[salvageV6]

Doubt the plug gap will help.

At what speed did the peak knock occur?

 

[ghall]

I am certainly no expert--just someone who enjoys beating on their car a bit.I will just give you an idea based on one of my last experiences at the track.
start of the day--the car was very rich and would spit-n-sputter down the track with about 20kr and 890mv.Started taking fuel pressure out----ALL day long one pound at a time--finally got down to 800mv and 0kr---car felt wicked.My car simply did not like running rich was the take-away i got.I made no other adjustments besides backing the fuel pressure down--and the results were obvious.Just an idea.

Geoff

 

[Vendor Defendor]

Geoff, what was your starting fuel pressure and what did you end up with?

thanks

-Neil

 

[scottyb]

Did the weather cool down there today? I usually run ~20-21 lbs with no knock (aside from transitional). When the cool weather hit last night, I started to see up to 3.0kr, so I backed off the actuator by one turn. It still makes more power since the temp is ~55 vs ~85. I'd say you're really pushing it at 24 lbs even in good weather conditions.

 

[ghall]

Originally posted by Vendor Defendor
Geoff, what was your starting fuel pressure and what did you end up with?

thanks

-Neil

Neil,
Started the day off at around 47(line off) and ended up around 42-41 by the end of the day.Funny thing is......i had the car out the day before on an old road near my house to do some tuning on it.The car was set up perfectly by the end of this session.I took the car home put it up for the night---loaded it on the trailer the next day and headed to the track.First pass was bad---didn't even make to the 1/8th mile mark before shutting down from KR--and just bad spi-n-sputter.Backed FP down 1 lb per pass until i found that magical number--and the car was good to go--never turned the boost down or made any other adjustment---like i said just an idea.

Geoff

 

[fast eddie]

Your turning the alcy on too soon,try 15psi turn on,I had the same problem when the weather changed ,ran with no alcy at all with 94oct fuel and 24#boost and no knock with 60* temps.....

 

[Vendor Defendor]

i dont know if this would have anything to do with it or not, but, would it be becasue i was running a 50/50 mix or water to denatured alky?

my bottle was about half empty, so i filled it up with more denatured, so that would put it at ~75/25 in favor of alky? could that help things out?

thanks

 

[Razor]

When learning to tune alcohol injection, ditch any water and run straight denatured. Next is the chip your using has to be a street/low timing chip. Typically an 18-20 degree chip works well. Next your fuel pressure typically is set 1-2 PSI under what you normally run. Since denatured is a fuel and burns.

Set your turnon at 12 PSI, run straight denatured, roll into the throttle..not mash it, watch the boost comeup and watch your knock. If you see a little KR then it disappears to zero..your on the rite track.

Just becuase your O2's are rich doesnt mean squat. All it means is your out of tune. You need to get the car into the mid-high 700's top of third gear to be anywhere close to making power.

Roll into the throttle..start seeing how your motor responds.

Did I mention..ditch the water.. you been reading to much technical stuff..once you get it running on denatured, then start adding water till you find a mix the car likes.. until then, stay off the water. Water blows the flame out..remember this.

HTH

 

[Vendor Defendor]

well, i got into it slowly, i could work my way all the way up, only to about 15psi, and apparently my alky was coming on @ ~5psi.. yikes dont know why it was coming on so early, but i fixed it now, it comes on after 10 psi but before 13, dont know exactly, for some reason i have a problem having my eyes in 5 places at once...

 

[larry33kc]

I just got my kit working and ran it with straight alky and it ran great, I ran it till the tank was about 1/4 empty then I filled it too about half full with water and whamo I was getting lots of kr with Os in the mid 800's, turn on at 10#'s HTH

 

[Razor]

Originally posted by larry33kc
I just got my kit working and ran it with straight alky and it ran great, I ran it till the tank was about 1/4 empty then I filled it too about half full with water and whamo I was getting lots of kr with Os in the mid 800's, turn on at 10#'s HTH

See and everyone says..run water..run water



Keep playing with water till you pop that head gasket..

 

[Vendor Defendor]

well, last night i 'eased into it' and at 15psi i got like 1.6 degrees of knock.

i noticed that one of my tailpipes it rattling pretty badly, i dont know if it is at WOT or not, i honestly am not paying attention to what my tail pipe does at that time. but could that be a sorcre of false knock? what about a bent front rim?

thanks

 

[Vendor Defendor]

humm, i fixed my tail pipe, it dosent rattle anymore, now its the down pipe, i notice it rattles a bit at idle.. its hitting i believe that heat shield where the cat was. so could it be a source of knock?

thanks

 

[Sinful6]

The downpipe has long been a source of false KR for many TR owners. I find that a lot of guys simply bang a small dent in the downpipe to make sure that it clears. If you decide to do this, don't go too crazy, we all know it's easier to put a dent in something than take it out.


-DC