Weird dip in curves and low output on dyno!
razorlab,
I installed the fpgreen as it came from FP. Do they send the turbo with the standard preload as stated on their site? I am assuming yes!
I am running 24-25 Psi peak. What preload would you recommend? I was thinking that maybe the higher setting will help the boost behaviour overall. What do you think?
Per FP website:
I installed the fpgreen as it came from FP. Do they send the turbo with the standard preload as stated on their site? I am assuming yes!
I am running 24-25 Psi peak. What preload would you recommend? I was thinking that maybe the higher setting will help the boost behaviour overall. What do you think?
Per FP website:
Preload of the actuator has a significant impact on the performance. The standard preload is 3 full turns past the "zero" point. A reasonable slightly higher amount of preload is 4 turns. Pictures and a helpful vid can be seen below.
Update!
Well....
I did a couple of things this weekend!
1. Replace pads and brake fluid on the Evo. Pretty straight forward with the right tools, lubricants, fluids, etc. I installed some Ferodo DS2500.
2. Changed all the vaccum lines for BOV, Intake Manifold and MBC.
3. Modified the preload for the 18PSI WGA. It was on the standard setting and did an additional full turn for the high setting.
4. Performed a Boost Leak test. Everything to be OK. No noticeable leaks!
After bedding the pads... I went to re-tune the MBC for the change in the preload. With MBC all the way up.... I am getting 20-21 PSI! Good!
Tuned it for a good ~25 PSI peak as before.
However, after a test pull on a highway I noticed that the car was pulling nicely and all of the sudden it stalled like when you accidentally press the clutch with the NLTS. Came back home to re-check and everything seems to be fine.
I decided to go out one more time with the logger on and this is what I got. Please refer to the red oval in red.
As you notice, I did not lift the throtle and suddenly the big drop in boost. It felt like a very bad backfire or a Intercooler Pipe blew off. Any ideas? Well... at least I do not have the dip in the 5000-5500 RPMs anymore.
I did a couple of things this weekend!
1. Replace pads and brake fluid on the Evo. Pretty straight forward with the right tools, lubricants, fluids, etc. I installed some Ferodo DS2500.
2. Changed all the vaccum lines for BOV, Intake Manifold and MBC.
3. Modified the preload for the 18PSI WGA. It was on the standard setting and did an additional full turn for the high setting.
4. Performed a Boost Leak test. Everything to be OK. No noticeable leaks!
After bedding the pads... I went to re-tune the MBC for the change in the preload. With MBC all the way up.... I am getting 20-21 PSI! Good!
Tuned it for a good ~25 PSI peak as before.
However, after a test pull on a highway I noticed that the car was pulling nicely and all of the sudden it stalled like when you accidentally press the clutch with the NLTS. Came back home to re-check and everything seems to be fine.
I decided to go out one more time with the logger on and this is what I got. Please refer to the red oval in red.
As you notice, I did not lift the throtle and suddenly the big drop in boost. It felt like a very bad backfire or a Intercooler Pipe blew off. Any ideas? Well... at least I do not have the dip in the 5000-5500 RPMs anymore.
Update - Sputtering Again! :-( WTF
Well.... I checked everything one more time and could not find anything wrong with the car. But.... A similar behaviour happened again. The boost drop re-appeared. But this time with two codes... P0000 and P0234. WTF!
Now, definately I have no clue what may be causing this!
I will start narrowing things down from the basics I guess.
Here is the screesnshot! (Note: the point selected in the graph was showing 24.4 PSI and the next point was 19.2. Big drop haaaaa!)
Mellon,
Those spikes at around 12.0 AFRs were fixed on subsequent pulls on the dyno. I used that graph because it was more pronounced the dip. Very good eye indeed!
Now, definately I have no clue what may be causing this!
I will start narrowing things down from the basics I guess.Here is the screesnshot! (Note: the point selected in the graph was showing 24.4 PSI and the next point was 19.2. Big drop haaaaa!)
Mellon,
Those spikes at around 12.0 AFRs were fixed on subsequent pulls on the dyno. I used that graph because it was more pronounced the dip. Very good eye indeed!
Could you take a pic of your engine bay and post it. Close ups of the BOV and piping would be preferred.
Also Mellon, why did you make the comment about richer AFR and more timing? Richer mixtures do not always tend to allow more lead. I found that comment very interesting.
Also Mellon, why did you make the comment about richer AFR and more timing? Richer mixtures do not always tend to allow more lead. I found that comment very interesting.
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It's been my experience that 12.0 + AFR is a bit too lean for 93 octane...yes you can make good power like that but I found that the gains made from leaning it out from say 11.5 to 12.0 are minuscule.
staying the 11's allows for more timing/boost and typically more power.
staying the 11's allows for more timing/boost and typically more power.