racerjoe
Well-Known Member
You used an AJE K-member, correct? Any photos of it installed? I’ve only seen their photos of the components. Just curious to see it on a car.
7875 + 5.9 + E85 + Megasquirt
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I have a few pics.
I’ll do a full write up on it as soon as I have the time.
I’ll do a full write up on it as soon as I have the time.
So I've read and re-read your build a couple times. Great build and super cool car. What are you doing with it lately? I'm very curious how it performs before/after GT45 vs 7875. Do you think you were anywhere close to maxing out either turbo?
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 I’d say id the better of the two. It spools quicker than the GT45, pulls hard up to 15psi (that’s as high as I’ve gone and with an overly rich tune) and it’s just an overall lighter and smaller package which is a big deal when your building the plumbing and trying to fit everything between your fenders.
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.
Moparturbo
Well-Known Member
Sounds good. Seems like it spools quick
Ahhhh!!! The sound of boost! I love it
Yeah bro it sounds great. Do you have any qualitative results with the new turbo vs the 45? Like does one seem to spool better than the other? Does one feel stronger? I'm just asking because I'm going to end up buying one or the other for my recently acquired 5.9 magnum.
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.
This was surprising to me. My gt45 spooled much easier/quicker. I wonder if it’s our downpipe size? Which exhaust housing are you running on your 7875?
The packaging is much nicer on the 7875, and success stories pretty universal across the web.
The car sounds great!
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 positive boost around 4k rpm when I ease into the throttle. The converter stalls to 3500.
Moparturbo
Well-Known Member
@subcom is this the turbo specs you are using? Turbocharger Fits Billet T78 7875 T4 A/R.96 A/R.75 800HP-1000HP 7875C-96-5 Turbo | eBay
Yep. Looks like the same one.
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 the dipstick vibrating in the tube. I’ve always had rear seal leaks and recently saw a little oil coming from the front seal. It’s gotta be too much crankcase pressure me thinks. So I took advantage of the 2nd bung I had welded into the oil pan and ran a catch can to it. Fingers crossed this helps.
Push in breather on each side.
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.
Matts440
Well-Known Member
Hopefully that works out for you, I tried that but ended up having to go vacuum pump on mine.
Ok. Seems like with it being near the bottom of the pan it would push oil up directly into the can if pressurized. Maybe I'm seeing the pan connection wrong.
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.
racerjoe
Well-Known Member
I use my car differently than you, primarily a street car that I autocross. As you can imagine, autocross does a good job of stirring the oil on top of several RPM transients over the course of 40-50 seconds. Prior to running a catch can, I would get lots of oil residue in the intake manifold through the PCV. Eventually it got to the point where it was blowing smoke from so much oil going down it's throat! I tried not having the PCV connected to the vacuum port, but that made an oily mess everywhere. It sees like it made it own vent anywhere it could. That's when I added a catch can. I use a sealed can basically in series with the PCV and vacuum port. It's a rather small can and after about 6-8 autocross runs, it would be full. Under normal driving conditions, it would stay empty. I've always been curious how a vented tank will work on an NA car. I feel like they are more suited for boosted applications. I know you are boosted so likely a moot point.
Ok being a rear sump pan that makes more sense. Still looks lower than it probably is probably a camera angle thing.
Nothing but accolades on your build though. I hope that between kids and my business I can get more time to work on cars one day.
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