GVR-4 knock help

[Bmxr152]

Alright RRE just told me tonight my car is see alot of knock. At WOT in 1st gear at around 12-14 psi it starts at 40 counts and then goes down to about 10 at 6k rpm. in 2nd gear it starts at 30 and then goes down to 5 by 6k rpm, but in 3rd and 4th gear there is almost no knock at all. RRE doesnt want to spend the time trying to find the knock so can some of you guys chime in with some suggestions? My current mods are on my profile.

 

[DankDSM]

have you tried replacing the knock sensor? These cars sometime get phantom nock. Also what a/f ratio are you running?
There are 2 ways you can get knock, to much fuel and to little. And with the injectors you are running on your setup along with low boost it is going to be hard to take out enough fuel with a afc. The translator should help with that though. What is the translator set at? these are just a few things you should think about when it comes to knock. Also check all the wires to and from the translator.
Good luck

 

[Bmxr152]

have you tried replacing the knock sensor? These cars sometime get phantom nock. Also what a/f ratio are you running?
There are 2 ways you can get knock, to much fuel and to little. And with the injectors you are running on your setup along with low boost it is going to be hard to take out enough fuel with a afc. The translator should help with that though. What is the translator set at? these are just a few things you should think about when it comes to knock. Also check all the wires to and from the translator.
Good luck

It has a brand new knock sensor, and RRE is doing all the tunning, but they cannot findout whats causing all the knock at low RPM. They also said at 18 psi there is so much knock its crazy.

 

[DankDSM]

What are they doing with the fuel when it is being tuned? What is your safc set at right now? Where they street tuning or using a dyno? What air fuel ratio where you going for? Have you checked for boost leaks yet?
It could also be phantom knock. What does the car sound like at low idle? Knock sensors are basically just microphones so if you stand behind the car you should hear a puttering when the car is knockin, especially if you are getting 40 counts.
Gonna need a little more info to find out whats wrong.

 

[Bmxr152]

What are they doing with the fuel when it is being tuned? What is your safc set at right now? Where they street tuning or using a dyno? What air fuel ratio where you going for? Have you checked for boost leaks yet?
It could also be phantom knock. What does the car sound like at low idle? Knock sensors are basically just microphones so if you stand behind the car you should hear a puttering when the car is knockin, especially if you are getting 40 counts.
Gonna need a little more info to find out whats wrong.

RRE did a leakdown and boost leak test. Everything came up good, no leaks. At idle the car sounds perfect, like any other dsm without ticking. They are street tunning it and i dont know what exact A/f or anything, but they are tunning the fuel, so its running in the normal A/F for a dsm. Thats what they told me tonight.

 

[JayRolla]

Im confused. All that and your knocking this much. What are your coolent temps at? How old is the motor? Have you done a compression check? Is the knock sensor torqued correctly. You can put in race gas and see if the knock goes down and that would eliminate phantom knock. Then you will know where to go from there. Usually knock goes up as the rpm's go up because the combustion chamber gets hotter.

 

[DankDSM]

that doesnt make much sense. are they using a wideband to tune it? what is the afc set at for low and high throttle? And with a safc you are basically lying to the ecu about how much air the engine is getting which effects how much fuel the injectors spit out. Afc's adjust air flow readings not fuel, but air flow readins is going to effect how much fuel you are running.
From the sound of things so far you are probably getting knock from too much fuel because when you go up in rpms the knock is going away. What i would do is set the translator to the size injectors i had and then fine tune with the afc. An easy solution might just be to up the boost and retune, but i think they arnt doing this because they are not using a wideband. Basically you need a wideband to really to it right.

 

[Bmxr152]

Im confused. All that and your knocking this much. What are your coolent temps at? How old is the motor? Have you done a compression check? Is the knock sensor torqued correctly. You can put in race gas and see if the knock goes down and that would eliminate phantom knock. Then you will know where to go from there. Usually knock goes up as the rpm's go up because the combustion chamber gets hotter.

It a brand new motor, and my coolant temps are around 198 degrees. They did a compression check at RRE and said it was around 170 across the board. Im going to try putting some race gas in tomarrow and se what happens.

 

[JayRolla]

that doesnt make much sense. are they using a wideband to tune it? what is the afc set at for low and high throttle? And with a safc you are basically lying to the ecu about how much air the engine is getting which effects how much fuel the injectors spit out. Afc's adjust air flow readings not fuel, but air flow readins is going to effect how much fuel you are running.
From the sound of things so far you are probably getting knock from too much fuel because when you go up in rpms the knock is going away. What i would do is set the translator to the size injectors i had and then fine tune with the afc. An easy solution might just be to up the boost and retune, but i think they arnt doing this because they are not using a wideband. Basically you need a wideband to really to it right.

Man, its RRE, im positive they are using a wideband. Also they know what they are doing on tuning, they are one of the best.

 

[Bmxr152]

Alright they pust some race gas in it and the knock went away. They told me the pistons i have may be causing to much compression for the 1g timing maps. My car is at 11 degrees advanced at idle, is that to high? Here is 2nd-4rd gear pump gas run and an idle showing the high timing.

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[Bmxr152]

anyone have any suggetions now?

 

[holland]

Well, sounds like you need something to adjust your timing and with only an AFC thats not possible. I have a keydiver stage 3 chip if your interested, only thing is that its made for 850cc injectors. You might be able to compensate for that in the AFC though.

 

[DankDSM]

Alright they pust some race gas in it and the knock went away. They told me the pistons i have may be causing to much compression for the 1g timing maps. My car is at 11 degrees advanced at idle, is that to high? Here is 2nd-4rd gear pump gas run and an idle showing the high timing.

From the looks of it they are not using a wideband to tune your vehicle only the stock 02 sensor. and yes 11 degrees of timing at idle is a little too high. To adjust this you should just have to loosed up the CAS and turn it to the left a little bit. You are aiming for 5 degrees of timing at idle. It looks like you dont have a wideband either. For them to use a wideband to tune your car they are going to have to hook it up to a dyno so either get some dyno time or you are going to have to buy a wideband 02 and get it hooked up. Try adjusting the CAS and see what that does. This might be the cause of all your problems.