I drove my car for the last time yesterday morning (Sunday 11/19/2023)...

[JPuehl]

Wow, that thing sounds awesome! Is it pretty loud just cruising around town?

That 1m style exhaust that was on your car, was the battery relocated, or any physical mods done to get the passenger side outlet to fit?

In addition to going to a split tip, do you think you'll add a second fork back on the passenger side?

It's not bad during normal cruise, I like it, but it is kind of loud, my neighbors know when I'm driving the car but I usually cruise thru my neighborhood in 3rd at low rpm to reduce the sound. For the 1M style exhaust, only the eval tank/canister was relocated to make it work. And some day I probably will run a pipe behind the diffuser to the passenger side for a tip to give it that 1M look, but it's not that high on my "list of things to do", lol. But if I find a tip I like I'll order 2 to be ready.

 

[wheela]

@JPuehl I can't remember if you've mentioned this in any other threads, but how would you compare response and spool of the 750 to your old ps2?

 

[JPuehl]

@JPuehl I can't remember if you've mentioned this in any other threads, but how would you compare response and spool of the 750 to your old ps2?

Actually, come to think of it I haven't compared logs of the 2 but I know the PS750 spools way better than I would have expected. With the PS750, since it's capable of more boost, like 28# compared to 23# on the PS2, I changed my tuning strategy to taper/ramp boost up to full 28# at 4500 rpm, rather than just flat lining boost target like I used to do with the PS2. I'll compare logs from the PS2 @ 23# to the PS750 @ 23# (on a 28# target) (before I slowed spool down) and report back what I see.

 

[JPuehl]

@JPuehl I can't remember if you've mentioned this in any other threads, but how would you compare response and spool of the 750 to your old ps2?

I was able to find a couple logs from the PS2 to compare to the PS750. Both logs were 4th gear and starting at about 3k rpm with about 3# boost at the time I went WOT. The PS2 got to 23# in about 1100 rpm or 1.5 seconds (using the Time column of the log). The PS750 did the same in about 700 rpm and 1.3 seconds. This would have been on the same section of road but of course there are environmental variables that could have affected the results. The PS2 log was taken at the end of July vs the PS750 log in February, so I can get a log in July for a closer comparison.

 

[valpfrmnc]

Hey J, could you do me a favor and see how much boost you are pushing at 80% WGDC? I am right now running not commanded wastegate and targeting 22 psi to redline but it falls off after 5600 rpmish from 22 psi to 16 psi at 80% WGDC.

 

[JPuehl]

Hey J, could you do me a favor and see how much boost you are pushing at 80% WGDC? I am right now running not commanded wastegate and targeting 22 psi to redline but it falls off after 5600 rpmish from 22 psi to 16 psi at 80% WGDC.

I don't run CWG however I can easily put a CWG tune together at 80% WGDC to test. I should be able to test this tomorrow as it's supposed to be dry then. I'll report back.

 

[JPuehl]

Hey J, could you do me a favor and see how much boost you are pushing at 80% WGDC? I am right now running not commanded wastegate and targeting 22 psi to redline but it falls off after 5600 rpmish from 22 psi to 16 psi at 80% WGDC.

I tried to do this today, the amb temps are 60* but partly cloudy so when I tried to get a log of somethings I was testing with my 20# tune the car decided it wanted to change lanes since the pavement didn't have enough heat to grip. It's supposed to be sunny tomorrow so I'll give it a go then.

 

[valpfrmnc]

Thanks, just wanted to double check as i had the feeling the 750 can run way more boost at 80% WGDC. Running a Pure800 on a B58 with 80% will push beyond 28 psi easily. I know you cant compare but they are pretty similar size. I also ordered the heavy duty actuator from Pure just to test if there is a difference.

 

[JPuehl]

Thanks, just wanted to double check as i had the feeling the 750 can run way more boost at 80% WGDC. Running a Pure800 on a B58 with 80% will push beyond 28 psi easily. I know you cant compare but they are pretty similar size. I also ordered the heavy duty actuator from Pure just to test if there is a difference.

Well, here's a log of my 28# tune that I ended up dyno-ing. There's not much left in the PS750:

20240411 - dyno base tune (test) - 1 - 5th gear pull

www.spoolstreet.com

 

[valpfrmnc]

Hey JPuehl, did you ever had the chance to run 80% wgdc?

 

[JPuehl]

Hey JPuehl, did you ever had the chance to run 80% wgdc?

Not yet, but the weather is actually warming up so I should have a chance to give it a try this weekend. If the pavement isn't warm (and dry) the car spins the tires and the logs aren't that accurate. 80% for me probably won't be the same as 80% for you as I have a big free flowing exhaust and big shorty free flowing intake, but I'll still give it a try. I already have the tune made for this test but was waiting for the conditions to allow the test.

 

[JPuehl]

Hey JPuehl, did you ever had the chance to run 80% wgdc?

OK, here's an attempt where I didn't get really loose, I did let off the throttle when I thought the car get loose. I ramped up WGDC to 80% by 4k rpm as you'll see, however there appears to be something taking away 3.4 DCs as my CWG table is flat at 80 from 4k on but I'm only reaching 76.6. I can see the same in my PID tunes so there's some kind of adder that has negative numbers. I have some better tires I'll be putting on the car to get better traction and can get better logs.

test - cwg - 80% wgdc - 1

www.spoolstreet.com

 

[valpfrmnc]

Thanks J, thats quite different from what i achieve. (20 psi). Only difference is the Injen intake since i also have a straight exhaust. Intake wouldnt make such a huge difference from experience. I also dont have a boost leak or vacuum leak so last resort is to replace wastegate actuator or the solenoid.

 

[JPuehl]

Thanks J, thats quite different from what i achieve. (20 psi). Only difference is the Injen intake since i also have a straight exhaust. Intake wouldnt make such a huge difference from experience. I also dont have a boost leak or vacuum leak so last resort is to replace wastegate actuator or the solenoid.

You may have shared this already but do you have any logs you can share showing the 20#? Just curious to see the difference.