Knock At 2k To 4k!! - SRT Forums

TURBOMATT · 01-03-2009, 12:02 PM

Hi I have had this issue for a long time with knock on my car. I now have a built motor and 50trim kit with 19-22lbs of boost and 100 meth and port fueler and predator. My ave air fuel ratio at wot is 11.3-11.9. I keep getting knock even in 5th gear flooring it and it starts when i get 2lbs of boost and it will ramp up to 3-4k of knock and lower a little as boost raises. Some time i get as much as 9.5knock just by flooring it for 3 seconds. Im thinking its a vibration noise, I have changed plugs, wires, coil, retorque exh bolts..... any ideas???... Ive also taken timing to -6 degress.....

duster360 · 01-03-2009, 12:23 PM

Incorrect Knock sensor torque
Noisy forged pistons
Hard trans mount
high static compression

port fueler doesn't mess with the map sesnor does it? Im thinking no.

Datalog like a mofo and see exactly when its comming in.

TURBOMATT · 01-03-2009, 12:27 PM

Quote: Originally Posted by duster360

Incorrect Knock sensor torque
Noisy forged pistons
Hard trans mount
high static compression

port fueler doesn't mess with the map sesnor does it? Im thinking no.

Datalog like a mofo and see exactly when its comming in.

well it does have a map clamp on it and i have 8.0 compression and no solid trans mount but i do have solid motor mounts, and torqued to specs

YoNkErZsRt4 · 01-03-2009, 09:17 PM

duster whats the correct tq specs on the knock sensor? i thought you said last time it was 195lb? i have a 3/8 micro tq ratchet, 195 didnt feel right. too much.

duster360 · 01-04-2009, 07:12 AM

Quote: Originally Posted by YoNkErZsRt4

duster whats the correct tq specs on the knock sensor? i thought you said last time it was 195lb? i have a 3/8 micro tq ratchet, 195 didnt feel right. too much.

Yes, 195 in-lb. be sure your wrench reads in-lb and not ft-lb. Otherwise 195ft-lb = 16.25 ft-lb

interesting that the hemi's use the exact same sesnor but only torque it to 176in-lb. I heard rumors of the knock sensor being too sensitive and I have thought to experiment with different Torques. I think I'll test this lower torque setting.

duster360 · 01-04-2009, 07:41 AM

Quote: Originally Posted by TURBOMATT

well it does have a map clamp on it and i have 8.0 compression and no solid trans mount but i do have solid motor mounts, and torqued to specs

I'd ditch the clamp, recheck the Knock sesnor torque and retest.

note: When i say "retest" I mean DATALOG and not just eyeball some stupid guage.

Mindmelt101 · 01-05-2009, 08:25 AM

Quote: Originally Posted by duster360

I'd ditch the clamp, recheck the Knock sesnor torque and retest.

note: When i say "retest" I mean DATALOG and not just eyeball some stupid guage.

For real. post a datalog.

01-03-2009, 12:02 PM	#1 (permalink)
TURBOMATT SRTforums Member Join Date: Apr 2005 Member Number: 27342 Location: Orlando FL Posts: 619	Knock At 2k To 4k!! Hi I have had this issue for a long time with knock on my car. I now have a built motor and 50trim kit with 19-22lbs of boost and 100 meth and port fueler and predator. My ave air fuel ratio at wot is 11.3-11.9. I keep getting knock even in 5th gear flooring it and it starts when i get 2lbs of boost and it will ramp up to 3-4k of knock and lower a little as boost raises. Some time i get as much as 9.5knock just by flooring it for 3 seconds. Im thinking its a vibration noise, I have changed plugs, wires, coil, retorque exh bolts..... any ideas???... Ive also taken timing to -6 degress..... __________________ Need your turbo rebuilt pm me, Napleton Chrysler. Mods: GATOR AXLES, AGP ZETA 3.0, BC4 cams,HAHN PORT fueler (1077cc), DSP, CTI intercooler, Perrin Exhaust, DEVILSOWN meth kit... Last edited by TURBOMATT; 01-03-2009 at 12:22 PM.

01-03-2009, 12:23 PM	#2 (permalink)
duster360 SRTforums Member Join Date: Aug 2006 Member Number: 45182 Location: Central IL Posts: 5,632	Incorrect Knock sensor torque Noisy forged pistons Hard trans mount high static compression port fueler doesn't mess with the map sesnor does it? Im thinking no. Datalog like a mofo and see exactly when its comming in. __________________ "Just because someone goes fast doesn't mean you should do whatever you think they did. This path assumes they knew what they were doing, which isn't necessarily the case"..........RB Racing TDS is the best choice for ALL your CMR Tuning.

01-03-2009, 12:27 PM	#3 (permalink)
TURBOMATT SRTforums Member Join Date: Apr 2005 Member Number: 27342 Location: Orlando FL Posts: 619	Quote: Originally Posted by duster360 Incorrect Knock sensor torque Noisy forged pistons Hard trans mount high static compression port fueler doesn't mess with the map sesnor does it? Im thinking no. Datalog like a mofo and see exactly when its comming in. well it does have a map clamp on it and i have 8.0 compression and no solid trans mount but i do have solid motor mounts, and torqued to specs __________________ Need your turbo rebuilt pm me, Napleton Chrysler. Mods: GATOR AXLES, AGP ZETA 3.0, BC4 cams,HAHN PORT fueler (1077cc), DSP, CTI intercooler, Perrin Exhaust, DEVILSOWN meth kit...

01-04-2009, 07:12 AM	#5 (permalink)
duster360 SRTforums Member Join Date: Aug 2006 Member Number: 45182 Location: Central IL Posts: 5,632	Quote: Originally Posted by YoNkErZsRt4 duster whats the correct tq specs on the knock sensor? i thought you said last time it was 195lb? i have a 3/8 micro tq ratchet, 195 didnt feel right. too much. Yes, 195 in-lb. be sure your wrench reads in-lb and not ft-lb. Otherwise 195ft-lb = 16.25 ft-lb interesting that the hemi's use the exact same sesnor but only torque it to 176in-lb. I heard rumors of the knock sensor being too sensitive and I have thought to experiment with different Torques. I think I'll test this lower torque setting. __________________ "Just because someone goes fast doesn't mean you should do whatever you think they did. This path assumes they knew what they were doing, which isn't necessarily the case"..........RB Racing TDS is the best choice for ALL your CMR Tuning. Last edited by duster360; 01-04-2009 at 07:39 AM.

01-04-2009, 07:41 AM	#6 (permalink)
duster360 SRTforums Member Join Date: Aug 2006 Member Number: 45182 Location: Central IL Posts: 5,632	Quote: Originally Posted by TURBOMATT well it does have a map clamp on it and i have 8.0 compression and no solid trans mount but i do have solid motor mounts, and torqued to specs I'd ditch the clamp, recheck the Knock sesnor torque and retest. note: When i say "retest" I mean DATALOG and not just eyeball some stupid guage. __________________ "Just because someone goes fast doesn't mean you should do whatever you think they did. This path assumes they knew what they were doing, which isn't necessarily the case"..........RB Racing TDS is the best choice for ALL your CMR Tuning.

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01-03-2009, 09:17 PM	#4 (permalink)
YoNkErZsRt4 SRTforums Member Join Date: Jul 2006 Member Number: 43878 Location: yonkers ny Posts: 1,072	duster whats the correct tq specs on the knock sensor? i thought you said last time it was 195lb? i have a 3/8 micro tq ratchet, 195 didnt feel right. too much.

01-05-2009, 08:25 AM	#7 (permalink)
Mindmelt101 *DSport Workgroup Mod* Join Date: Aug 2008 Member Number: 66961 Location: Taco Bell/TX Posts: 826	Quote: Originally Posted by duster360 I'd ditch the clamp, recheck the Knock sesnor torque and retest. note: When i say "retest" I mean DATALOG and not just eyeball some stupid guage. For real. post a datalog.

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