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The bung is at the top of the pan in the front, well above the oil level. This is a rear sump pan also so under WOT conditions the oil should be mostly in the back and in the sump, far away from this bung. I still need to test some more but so far it seems to be working. Fingers crossed.

It evacuates pressure to the catch can directly from the oil pan in this case. The filter at the top of the can allows the gases to escape while the catch can collects oil vapor.

Is this Megasquirt? It’s not the rev limiter or AFR safety system kicking in at 6k?

What are the symptoms of valve float? Does it happen under any amount of boost or only when you get up into the higher PSIs? Is this with the exhaust wide open? I noticed in my back pressure tests that my RPM was hitting a 5800-5900 ceiling when running through the muffler.

I’ve thought about going that route also but I’d have to rebuild my hot side to get a s475/s480 to fit. What I’m really itching to do is two smaller turbos tucked up inside the fender wells behind the headlights. :)

Thanks @TT5.9mag. As always I appreciate and value your feedback. The exhaust outlet on this eBay model is 3” so that’s where we’ll stay. I’m not quite ready to throw in the towel on this turbo but the back pressure numbers are informative. I know a 1:1 ratio is ideal and 2:1 is not uncommon at...

Im more interested in strip performance. The street driving is just for tuning for the track, although the quick spool is fun. I don’t street race or anything. Do you think there are gains to be made by increasing the downpipe from 3 to 4”? I’m thinking the next logical step is an upgrade to the...

Push in breather on each side.

Starting a couple years back I had noticed that after a boosted run I would sometimes get a strange fluttering sound like a piece of paper was sucked into the torque converter. I never figured it out until recently. Crankcase pressure was popping the dipstick out of the tube and the sound was...

Test 4: Same as above but turned on the boost controller and set duty cycle to command about 10psi. Made one run. Boost PSI: 11 Backpressure: 16.7

Test 3: Removed the exhaust after the downpipe. Still running on spring pressure only (5-7psi). Made 3 runs. This is all easing into the throttle in 3rd gear. Boost PSI: 7.0-7.2 Backpressure: 9-11.8

More data coming in. I dropped the exhaust after the downpipe. It's about 7' of 3" exhaust with a cutout and short open chamber muffler.

That’s test #2.

It’s a single 3” actually.

Later on I'll turn up the boost and maybe try dropping the exhaust after the downpipe which would give me about 30" of 3" exhaust with no major turns or restrictions. ...to be continued.

Test 2: Everything else the same, just dumping the exhaust before muffler with the 3" cutout. Boost: 7psi Back Pressure: 12.9-13.0

7875 with .96 AR Test 1: Running on spring pressure only (5-7psi). 3" downpipe to 3", 2x 90 degree turns to open chamber muffler, dumping before rear axle. Boost PSI: 5.4-5.5 Back Pressure: 17.7-18.6

Let’s have some fun measuring boost back pressure under different scenarios. Step 1, install pressure sensor: 1/4” OD copper tubing, compression fittings, weld bung, 100psi sensor wired and calibrated in TunerStudio.

Yep. Looks like the same one.

Could be that the GT45 spools faster. I don't have any old logs from when I had mine. The 7875 just feels like it spools faster based on the seat-of-the-pants meter. I don't have any logs of me smashing the gas pedal since that's usually a waste of tires on the street but it does go into...

Just go with the 78/75 EBay special. If it doesn’t check all of your boxes your only out about $200. You’re gonna spend 10x that on fuel delivery and management.

Doing a little street tuning today. Been sneaking up on the tune using the Autotune feature in TunerStudio. Finally getting closer and out of the overly rich AFR areas. Bumped up the boost controller to 10psi and did a few rolling blasts on the street.

Haven’t done much to it lately. I swapped out the electric fan setup for a Ford dual fan and wired it to a PWM controller and my Megasquirt which has a new fan controller upgrade that works great. Re: the turbos it’s hard to say. I never tried to max out either. Both make great power. The 78/75...

12-14psi on the upper end using the boost controller.

I can’t think of any cons going with a catch can aside from figuring out how to plumb it into your valve covers and where to mount the can under the hood. I run a breather in each valve cover and don’t have any oil spraying under the hood or heavy blow by but recently discovered my dipstick was...

I have a few pics. I’ll do a full write up on it as soon as I have the time.

My junk is back on all 4s after the front suspension swap. I lowered it a bit front and back and still need a professional alignment but after a few miles of test driving I’m happy with it.

The Lowdoller fuel pressure sensor is configured in analog inputs. Once enabled and labeled you should be able to capture it in your logging and view it when importing the log into MegaLogViewer. If you haven't already, I recommend buying the licensed versions of both TunerStudio and...

I think it’s an analog input I had to configure and label. I can look it up for you later when I’m in front of my laptop.