EfiniX
Probationary Member
- 14
- 0
- Dec 5, 2012
-
Portland,
Oregon
First off, thank you in advance for reading and lending a hand. I'm new to tuning turbo cars, but I'm a fascinated by the process and eager to learn. I'm also eager not to blow my car up, so helpful advice is always welcome.
A little history. '92 Galant VR4 w/ 4000mi on a new motor. Here's the relevant bits. The complete build thread is over on the vr4 org @ http://goo.gl/LXmzhm
I've read the tech forum guidelines and all of the "verify this before posting" stuff is verified.
Engine:
BC1100 valve springs
3g revised lifters
264/264 Delta cam regrinds
new knock sensor
Bolt-on’s:
T3-T04 w/ .60AR
FP racing exhaust manifold
Fujitsubo Legalis R 3” complete exhaust w/ custom 2.5” downpipe
K&N filter w/ MAF adaptor
ETS intercooler kit
High-flow cat
Other bits:
Walbro 255 fuel pump
FIC 950cc injectors
Hallman boost controller
DSMLink v3
Innovate Wideband
Southbend clutch (TZ Kevlar disk/SS-Series 2200# pressure plate)
On to the good stuff....
I'm driving on a dyno tune right now and I've noticed a few things. One is a rich condition at a certain MAF value, the other is a small (but noticeable due to timing getting pulled) amount of knock.
I'm seeing knock under boost 100% of the time when my boost hits 20psi. Sometimes while I'm in third gear, I don't see enough to throw a CEL. Other times I do. 100% of the time I see a CEL in 4th gear. I see knock at partial throttle under moderate boost at a lower RPM. Just one or two counts, so again, not enough to light the CEL. Different cells in the timing table as well (from WOT).
So I did 3 WOT pulls, and a partial throttle 2nd gear pull. Here's my cursory observations.
1. The boost est. seems accurate, even though my gauge is progressively resting clockwise of 0 (need a new gauge).
2. I seem to be running a bit lean between 300-500Hz on the MAF
3. I seem to be running SUPER rich at 670-730Hz on the MAF
4. I'm seeing knock at WOT when my max octane timing table hits 2.2/2.4 load @ 4500 rpms. This is the same for all 3 WOT pulls.
Here's thoughts.
1. Get a new boost gauge and yay, my airflow seems accurate.
2. If this is an issue, adjust the MAFComp to richen up between 300-500Hz.
3. Adjust the MAFComp to lean out a bit @ the effected Hz. What should my target A/F value look like at this point in a WOT pull? Does it track ok, or am I running rich/lean elsewhere (which I guess goes back to #2)?
4. I have two choices here that I can see. I can either pull a degree of timing at a time in and around the affected areas, or I can lower my boost a bit. Which is the better choice?
Of course, i asked the tuner for his advice and he said "That seems that it is the same are we richened up before that was "lean" but is somehow now rich. 4500 is phantom knock when the knock control comes back on but you could grab the slider and pul 2* and see if it goes away...my money is on it not changing."
I have no idea what the first sentence means, but this seems like normal knock given that it's a low counts at higher RPM's + boost. I had phantom knock before the new motor and it was like 47 counts @ 3200 RPM's or something nutty like that.
Thanks in advance!
A little history. '92 Galant VR4 w/ 4000mi on a new motor. Here's the relevant bits. The complete build thread is over on the vr4 org @ http://goo.gl/LXmzhm
I've read the tech forum guidelines and all of the "verify this before posting" stuff is verified.
Engine:
BC1100 valve springs
3g revised lifters
264/264 Delta cam regrinds
new knock sensor
Bolt-on’s:
T3-T04 w/ .60AR
FP racing exhaust manifold
Fujitsubo Legalis R 3” complete exhaust w/ custom 2.5” downpipe
K&N filter w/ MAF adaptor
ETS intercooler kit
High-flow cat
Other bits:
Walbro 255 fuel pump
FIC 950cc injectors
Hallman boost controller
DSMLink v3
Innovate Wideband
Southbend clutch (TZ Kevlar disk/SS-Series 2200# pressure plate)
On to the good stuff....
I'm driving on a dyno tune right now and I've noticed a few things. One is a rich condition at a certain MAF value, the other is a small (but noticeable due to timing getting pulled) amount of knock.
I'm seeing knock under boost 100% of the time when my boost hits 20psi. Sometimes while I'm in third gear, I don't see enough to throw a CEL. Other times I do. 100% of the time I see a CEL in 4th gear. I see knock at partial throttle under moderate boost at a lower RPM. Just one or two counts, so again, not enough to light the CEL. Different cells in the timing table as well (from WOT).
So I did 3 WOT pulls, and a partial throttle 2nd gear pull. Here's my cursory observations.
1. The boost est. seems accurate, even though my gauge is progressively resting clockwise of 0 (need a new gauge).
2. I seem to be running a bit lean between 300-500Hz on the MAF
3. I seem to be running SUPER rich at 670-730Hz on the MAF
4. I'm seeing knock at WOT when my max octane timing table hits 2.2/2.4 load @ 4500 rpms. This is the same for all 3 WOT pulls.
Here's thoughts.
1. Get a new boost gauge and yay, my airflow seems accurate.
2. If this is an issue, adjust the MAFComp to richen up between 300-500Hz.
3. Adjust the MAFComp to lean out a bit @ the effected Hz. What should my target A/F value look like at this point in a WOT pull? Does it track ok, or am I running rich/lean elsewhere (which I guess goes back to #2)?
4. I have two choices here that I can see. I can either pull a degree of timing at a time in and around the affected areas, or I can lower my boost a bit. Which is the better choice?
Of course, i asked the tuner for his advice and he said "That seems that it is the same are we richened up before that was "lean" but is somehow now rich. 4500 is phantom knock when the knock control comes back on but you could grab the slider and pul 2* and see if it goes away...my money is on it not changing."
I have no idea what the first sentence means, but this seems like normal knock given that it's a low counts at higher RPM's + boost. I had phantom knock before the new motor and it was like 47 counts @ 3200 RPM's or something nutty like that.
Thanks in advance!
