search not working! so i have knock questions

[Mephisto]

i tried the search feature and it aint working, it says something about "debuging"?????

so now im gonna ask questions that im sure have been answered before, so maybe someone can post a link to a topic or offer a quick answer?

i got the new ITS mini gate installed (thanks mike)

finally i have rock solid boost! yay! but since the wastegate is not integral, does that mean that boost will not go down when knock goes up?

i went out for a DM run, and to my suprise i had a solid 14.7psi of boost, accompanied with 16.7* of knock! now i was gonna keep my foot in it till it went away, but it the knocking just kept getting louder and i got scared, and let off. :lol:

now im sure 91oct is part of the cause, but i have a crazy feeling that xylene or 101 oct gas is not gonna aleve 16* of knock. so looks like im in need of an ignition tune up. one other question i have is... does fuel psi affect knock?

sorry to ask questions that im sure have been covered a hundred times. but in my defense the search feature isnt working

 

[Falco]

Re: search not working! so i have knock questions

finally i have rock solid boost! yay! but since the wastegate is not integral, does that mean that boost will not go down when knock goes up? (

True...

i went out for a DM run, and to my suprise i had a solid 14.7psi of boost, accompanied with 16.7* of knock! now i was gonna keep my foot in it till it went away, but it the knocking just kept getting louder and i got scared, and let off. :lol: (

If you can hear your engine detonating, it's bad. Don't do this or you will ask about engine rebuilding questions soon enough.

now im sure 91oct is part of the cause, but i have a crazy feeling that xylene or 101 oct gas is not gonna aleve 16* of knock. so looks like im in need of an ignition tune up. one other question i have is... does fuel psi affect knock?(

Replace that shitty gas, it has been reported more than once that 91 is not enough for our trucks. Also do you have all the basic mods? Walbro, AFPR? What kinda chip do you run? When did you replace your fuel filter the last time? And yes, low fuel pressure could cause non satisfactory fuel delivery under boost. Check you FP with the vacuum hose disconnected and plugged. Do you have a FP gauge connected permanently? Also do a full ignition tuneup. Plugs, wires, rotor, cap, maybe coil especially if it's still the original.

Later,

 

[Mephisto]

Re: search not working! so i have knock questions

finally i have rock solid boost! yay! but since the wastegate is not integral, does that mean that boost will not go down when knock goes up? (

True...

i went out for a DM run, and to my suprise i had a solid 14.7psi of boost, accompanied with 16.7* of knock! now i was gonna keep my foot in it till it went away, but it the knocking just kept getting louder and i got scared, and let off. :lol: (

If you can hear your engine detonating, it's bad. Don't do this or you will ask about engine rebuilding questions soon enough.

hahaha i was just kidding about keeping my foot in it... but its a lil harder to hear knock now that i have an ext. gate

now im sure 91oct is part of the cause, but i have a crazy feeling that xylene or 101 oct gas is not gonna aleve 16* of knock. so looks like im in need of an ignition tune up. one other question i have is... does fuel psi affect knock?(

[qupte]Replace that shitty gas, it has been reported more than once that 91 is not enough for our trucks. Also do you have all the basic mods? Walbro, AFPR? What kinda chip do you run? When did you replace your fuel filter the last time? And yes, low fuel pressure could cause non satisfactory fuel delivery under boost. Check you FP with the vacuum hose disconnected and plugged. Do you have a FP gauge connected permanently? Also do a full ignition tuneup. Plugs, wires, rotor, cap, maybe coil especially if it's still the original.

Later,

i have all the basic mods done, walbro, afpr, conrad, msd wires, although i have not replaced the original coil. right now im using the ultimate set at T1-18, with the boost controller set to about 15psi. i agree that an ignition tune up needs to be done. last time i did the fuel filter was about 15k ago, so i need to change that also. DM shows fuel delivery to be sufficient, LT counts are perfect at 128 as well as the ST counts (under boost). right now i have the fuel psi at about 48psi, cause at 50psi it was running way too rich at idle and under boost. 02 volts are in the high 900s sometimes creeping into the thousands. and like you said 91oct is total shit... so looks like i need to start savin up for an alky kit. also my volts are always at 13.x

one other question is... im sure the timing is a lil advanced, but would that really be a cause of knock? i would think it would help keep it down, no?

thanks for the help falco

 

[InvisiBill]

Integral or external doesn't affect the boost/knock relationship, the boost controller does. Most people switch to a separate boost controller when they install an external. Since the ECM is no longer controlling boost, it can't do anything when it detects knock. If you run the stock vac line to the new wastegate, it will work just like stock (assuming the new wastegate has the same base boost, and therefore the stock code would be calibrated properly).

 

[Falco]

Set back your timing to 0 and also check it to TDC. Mechanicaly advanced timing won't do any good for you...

What about with your IC? What kinda intake temps can you see after a run?

Later,

 

[Mephisto]

What about with your IC? What kinda intake temps can you see after a run?

whoa! wtf??? i dunno how i managed to over look that! but my IC temps are around 220* after the run maybe i have a kink in the heater hoses somewhere, and its not flowing. cause thats about 100* over normal, especially with weather in the low 70s.

thanks again for the help! im sure after i get all these major issues settled, knock will be very minimal if at all.

 

[myclone]

Re: search not working! so i have knock questions

[ im sure the timing is a lil advanced, but would that really be a cause of knock? i would think it would help keep it down, no?

Advanced timing=detonation in a stock or close to stock set up.
Retarded timing=less/no detonation but lousy low rpm responce.

FYI.. Running 91 octane with no alchy will prolly limit you to ~12psi at 0 deg advance.

Set the timing back to the stock 0 deg with the set timing connector disconnected and turn the boost back to 10psi. Also take care of the IAT temps as 220 deg would have a HUGE affect in causing detonation especially with 91 octane. That might save you from driving over the crank.

 

[Falco]

Yep, as Dave said. Troubleshoot your IC, get better gas, set back your timing to 0 and log a run in DM. It should be all set. My intake temps are in the 90's at the end of a 1/4 mile run while the outside temps in the high 70's, low 80's. That's with a stock IC...

Later,