lol, I'm not sure exactly what's wrong or why it says "valid" but somehow I don't think it's valid.

 

This one looks good and it's slight uphill, so 2.8s isn't out of reach...

 

my results aren't too far off what PTF did on the older alpha 3076 with the same pumpgas.

 

Impressive for 91oct Bogg. Keep at it!

Growing fond of this option lol

 

As I said: your wastegate setup is not ok. You have no modulation at all and looking at your charts it seems you have quite a boost overshoot on gear change.

I would log the boost curve and have a good look at it, especially on wastegate springs alone. .8 to .9 almost flat is what I would like to see.

There is just not enough room for the controller to work.

 

Where are u seeing boost overshoot on gear change? I have the log of the whole run on wastegate and will post it later.

 

Wastegate spring pressure is generally set by the lowest possible boost you ever want to be capable to run in your set up. Assuming that the boost controller is properly set up; the wastegates are properly plumed into the system then having a high static spring starting point will not effect operation - e.g. creating boost spikes between gears etc. I have seen situations where BOV misfunctions created boost spikes in the intercooler charge pipes between shifts - the function of the BOV is to release the air and allow the turbo to spin when you close the throttle without creating a boost spike

I DO NOT THINK YOU POSTED any logs of your boost at least non that I can see so I am at a loss to determine what the other member is talking about


BTW - on a separate note - that dyno sheet posted about is horrible. I do not know why it takes a nose drive off a cliff after peak power at 6500 and falls down nearly 100 whp towards the end of the run - this makes no sense - something not kosher with that situation - unless of course the operator is starting and stopping the dyno after the car is off boost?

 

Sorry, I did not look at your 60-100 2.5s run carefully enough. I though the red hump was after a gear change, but it is just a signal dropout which can be seen in the height value dropping almost 570 ft. That's probably where your 2.5 comes from.

As for the wastegate springs: yes, you can run higher spring forces, but not as close to the target pressure as you have. What's the point in having a controller to control 0.1 bar of pressure? Just turn the nut on the wastegate and you are done without a controller.

No, this is not the way wastegates are supposed to work. I run an external boost controller, .9 bar spring pressure and 1.85 bar boost. I run boost by gear and have different boost ramp in different gears. 1.4 bar in 3rd, 1.6 bar to 1.85 bar in 4th.

The controller modulates just fine between these values which is important for part throttle driving as well as for a safety margin. When my controller enters safe state for whatever reason, I run only on spring pressure at .9 bar and you wouldn't even notice a big difference with your setup.

There is absolutely no reason to setup a car like that. At least I wouldn't do it. It is your car, have fun.

 

Based on the amount of drop off I don't not believe it was WOT after 6600-6700rpm. However you are correct a stock cam, head, intake manifold setup usually peaks around 6500rpm.

 

Yes but it is not going to drop off 200 whp unless a boost hose came off etc

 

There is something seriously wrong with that dyno sheet the car is dropping 300 whp in 500 rpm - only plausible explanation is he lifted his foot off the gas and coasted and then hit the dyno end run button late

 

I appreciate your input. I am having some issues reaching targets as I increase the target and I realize from many of my logs that I'm very close to wastegate pressure even though I've requested more boost. I'm going to play with the correction/offset setting to see if that helps. I know I was able to get more boost in the midrange by setting the default value to 14.5psi even though the actual wastegate peak psi is 20psi. Worst case I will get different springs for the wg...

 

you should put 15psi springs in the wastegates. go thru setup of the HKS, start with offset of 100 and work up or down from there. HKS that is setup correctly should have no problem reaching targets. do you have any logs of your boost vs RPM graphed?

 

Hey Mark, I always appreciate your input. I do have a graph of boost vs rpm which I will post later. Today I changed the offset to 110% from the baseline 100% and it looks and felt like it gets a lot closer to target boost. I wasn't able to log yet today but am eagerly looking forward to the end of this work day to datalog because things are looking up!

 

Today I accelerated in 2nd and then fairly hard in 3rd and as I was thinking how awesome the car is I realized the boost controller wasn't even on, lol.

I managed a datalog in 3rd and it didn't reach as high boost as it had in 4th earlier in the day but it was a bit higher than previous so I think I'm on the right track with the "offset" adjustment. I think because the target boost is so close to wg at 6k rpm range that the controller isn't having a strong effect. I will try 120% offset and possibly increase the boost target to 22psi (with the goal of hitting 22psi around 5-5500rpm).

I read a thread elsewhere that said that in order to properly "train" the boost controller that a baseline pull should be performed right after any changes are made. I wonder if it's important to always do the first pull on a new setting in 3rd gear (and not 4th gear)? I do try to make it that way for the sake of consistency but not sure it really matters.