Full build thread....TONS of pics!
#141
Senior Member
SL Member
Scion Evolution
Thread Starter
Join Date: Feb 2005
Location: Motor City
Posts: 2,860
well just spoke to my tuner...
He said that my motor was alot more quite then other tC motors to start with. The problem was that right around the 5500rpm range Id get a jump in knock volts like .7-1volt instead a nice curve in knock volts due to engine noise.
#142
you should be able to change the parameters of the knock retard to add fuel and pull timing based on voltage. if the engine is noisier than most, just set the knock retard at 1.2 volts and tune away. see what i does with a fresh tank of gas first before changing the settings though.
#145
Knock voltage threshold can vary from vehicle to vehicle due to harmonics from rotating assembly removal, the individual turbo setup etc. You need to make sure you do a full RPM pull with conservative timing and enough fuel to guarantee there is no knock and establish your individual knock profile then proceed accordingly.
#151
#152
Senior Member
SL Member
Scion Evolution
Thread Starter
Join Date: Feb 2005
Location: Motor City
Posts: 2,860
We tried pulling the timing alittle and still got alittle knock in the same range.
It could be so many things so we are just going to take it one thing at a time. Gas being the first.
Good part is the engine ran really really good till that point. I was alittle nervous getting on the dyno after all the time and work i put into it I just didnt want anythign to break and nothing did.
Another thing i was thinking is maybe it was starting to heat soak alittle bit. Started knocking on like run 15-17 and it was hot a humid plus the alum. intake mani. That prolly will prolly add to the heat soak.
Keep the thoughts coming if anyone else thinks of something....
It could be so many things so we are just going to take it one thing at a time. Gas being the first.
Good part is the engine ran really really good till that point. I was alittle nervous getting on the dyno after all the time and work i put into it I just didnt want anythign to break and nothing did.
Another thing i was thinking is maybe it was starting to heat soak alittle bit. Started knocking on like run 15-17 and it was hot a humid plus the alum. intake mani. That prolly will prolly add to the heat soak.
Keep the thoughts coming if anyone else thinks of something....
#153
We tried pulling the timing alittle and still got alittle knock in the same range.
It could be so many things so we are just going to take it one thing at a time. Gas being the first.
Good part is the engine ran really really good till that point. I was alittle nervous getting on the dyno after all the time and work i put into it I just didnt want anythign to break and nothing did.
Another thing i was thinking is maybe it was starting to heat soak alittle bit. Started knocking on like run 15-17 and it was hot a humid plus the alum. intake mani. That prolly will prolly add to the heat soak.
Keep the thoughts coming if anyone else thinks of something....
It could be so many things so we are just going to take it one thing at a time. Gas being the first.
Good part is the engine ran really really good till that point. I was alittle nervous getting on the dyno after all the time and work i put into it I just didnt want anythign to break and nothing did.
Another thing i was thinking is maybe it was starting to heat soak alittle bit. Started knocking on like run 15-17 and it was hot a humid plus the alum. intake mani. That prolly will prolly add to the heat soak.
Keep the thoughts coming if anyone else thinks of something....
#154
haha i think in the end we did about 22 pulls? but we would do a pull, crank up the heat and wait a couple minutes in between so it wasn't technically right after the other... but not a giant wait.
#160
That knock there could be engine harmomics and/or setup rattles and such that triggered the knock sensor, which I have seen a few times.
In all, if it was knock, then the setup or fuel & ignition should be addressed. Either run a richer AFR or less timing. One way or the other you need to slow down combustion. Simple as that. If you still can not control the det, then a higher quality fuel, more efficient turbocharger, more efficient intercooler should be addressed for the power goals and use of the car.
With respect to your timing comment, at what boost level have you observed this? What where the peak EGTs?
Just note that I am not trying to have a pooping match with you, just simply keeping everything 100% factual and educational for the community.