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Re: Adam's formerly supercharged... now soon-to-be-turbo'd,

Posted: Tue Sep 25, 2018 9:14 pm
by p00t
Still kicking ass. Nice kills!

Re: Adam's formerly supercharged... now soon-to-be-turbo'd,

Posted: Sun Jan 20, 2019 11:11 pm
by adamky
I guess I'm overdue to post some updates. I'm now at over 168K on the odometer, which means I have 13,000+ miles on this motor so far. (The rebuild was at 155,111 miles, which was in September of 2016). She is still kicking a55 and going strong!!



So, after d!cking around with this for well over a year, I FINALLY have the brushless vacuum pump setup all installed in the car and working. The vacuum pump itself is a huge step up over the old brushed motor. It screams at full throttle. It pulled -7.5 inHg on my test bench, which is twice the vacuum that the old one could pull. I think it may actually be able to keep up with higher boost levels (and the resultant increase in blow-by) that the old brushed motor simply couldn't handle. If it doesn't, I have a backup plan. So, we'll see...

I mounted my 2 relays, my Electronic Speed Controller, a 50 amp breaker, and my hacked servo tester to a scrap piece of aluminum and mounted the whole thing to the side of the trunk just above my battery box.

One relay controls main power to the ESC and servo tester. The other relay simply closes a connection that forces the servo tester to speed the motor up to whatever speed I specify. The speed can be changed using a 1/4 watt resistor that can be swapped out.

The whole thing is programmed to activate whenever intake manifold pressure is above -2 inHg and the vacuum in the tank is BELOW -4 inHg. Once activated, it pulls a solid -6 inHg and stays on until either the intake manifold vacuum drops below -2" inHg, or the vacuum in the vacuum tank gets below -8 inHg.



To sum it up.... anytime the intake manifold is under boost and the vacuum tank is below -4 inHg, the pump will be active, ensuring that there is constant vacuum in the tank (and the crankcase). And this will hopefully keep my dipstick from blowing out on long 4th and 5th gear pulls.

So far, the vacuum pump doesn't seem to hit the electrical system too hard on activation, which is good. And voltage only dropped like 0.1-0.2 volts while it was running. I was kind of worried it was going to be more of an electrical drain than what it it is.


Pictures:
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In addition to the pump, I installed an additional one way check valve going to the vacuum pump with a junction pipe connecting the two outputs together. This is because I realized that there was a good chance that using only one valve was limiting how fast I could pull air out of the tank. The check valves open at a very low cracking pressure, like .5 psi, but they don't seem to flow a lot of air once open. Hopefully the combination of the brushless pump as well as the additional valve will fix this and I can refocus on tuning this b!tch on speed density!

Here's the additional one-way valve installed with the junction pipe connecting the two together:
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Re: Adam's formerly supercharged... now soon-to-be-turbo'd,

Posted: Mon Jan 21, 2019 12:34 pm
by s14fiend
adamky wrote:I guess I'm overdue to post some updates. I'm now at over 168K on the odometer, which means I have 13,000+ miles on this motor so far. (The rebuild was at 155,111 miles, which was in September of 2016). She is still kicking a55 and going strong!!



So, after d!cking around with this for well over a year, I FINALLY have the brushless vacuum pump setup all installed in the car and working. The vacuum pump itself is a huge step up over the old brushed motor. It screams at full throttle. It pulled -7.5 inHg on my test bench, which is twice the vacuum that the old one could pull. I think it may actually be able to keep up with higher boost levels (and the resultant increase in blow-by) that the old brushed motor simply couldn't handle. If it doesn't, I have a backup plan. So, we'll see...

I mounted my 2 relays, my Electronic Speed Controller, a 50 amp breaker, and my hacked servo tester to a scrap piece of aluminum and mounted the whole thing to the side of the trunk just above my battery box.

One relay controls main power to the ESC and servo tester. The other relay simply closes a connection that forces the servo tester to speed the motor up to whatever speed I specify. The speed can be changed using a 1/4 watt resistor that can be swapped out.

The whole thing is programmed to activate whenever intake manifold pressure is above -2 inHg and the vacuum in the tank is BELOW -4 inHg. Once activated, it pulls a solid -6 inHg and stays on until either the intake manifold vacuum drops below -2" inHg, or the vacuum in the vacuum tank gets below -8 inHg.



To sum it up.... anytime the intake manifold is under boost and the vacuum tank is below -4 inHg, the pump will be active, ensuring that there is constant vacuum in the tank (and the crankcase). And this will hopefully keep my dipstick from blowing out on long 4th and 5th gear pulls.

So far, the vacuum pump doesn't seem to hit the electrical system too hard on activation, which is good. And voltage only dropped like 0.1-0.2 volts while it was running. I was kind of worried it was going to be more of an electrical drain than what it it is.


Pictures:
Image
Image
Image


In addition to the pump, I installed an additional one way check valve going to the vacuum pump with a junction pipe connecting the two outputs together. This is because I realized that there was a good chance that using only one valve was limiting how fast I could pull air out of the tank. The check valves open at a very low cracking pressure, like .5 psi, but they don't seem to flow a lot of air once open. Hopefully the combination of the brushless pump as well as the additional valve will fix this and I can refocus on tuning this b!tch on speed density!

Here's the additional one-way valve installed with the junction pipe connecting the two together:
Image
Image
Good to hear someone is still wrenching on these things.... keep us posted no the progress and results.

I take it this would theoretically let the engine and engine oil last longer?

Re: Adam's formerly supercharged... now soon-to-be-turbo'd,

Posted: Wed Feb 06, 2019 10:49 am
by nelson240sx
this is cool, some home brew projects

Re: Adam's formerly supercharged... now soon-to-be-turbo'd,

Posted: Mon Feb 11, 2019 10:08 pm
by adamky
s14fiend wrote:Good to hear someone is still wrenching on these things.... keep us posted no the progress and results.

I take it this would theoretically let the engine and engine oil last longer?
Yes, one of the vacuum setup's main advantages is that it keeps the oil cleaner. And I'm hoping the motor will last longer as a result.
nelson240sx wrote:this is cool, some home brew projects
Thanks man.


The new vacuum pump is working great so far. Since it wasn't causing much of a drain electrically, I went ahead and bumped the motor speed up to the max, which pulls -7 inHg. I have yet to see the tank get less than -4 inHg, and it only does that for a moment before the vacuum pump is activated and gets it back to -7. I also haven't blown the dipstick out yet.

I can hear the pump as it kicks on. It's faint, but it sounds so cool, and it is so satisfying to see the vacuum in the tank jump so quickly from -4 to -7 inHg and just stay there as I continue accelerating.

What's cool is that I ALWAYS have vacuum in my crankcase now, and 98% of the time, it's a completely passive system.

It's been a learning process and a lot of trial-and-error getting this vacuum setup sorted out, but I couldn't be more pleased with how it is working right now.

Re: Adam's formerly supercharged... now soon-to-be-turbo'd,

Posted: Thu Feb 14, 2019 10:48 am
by nelson240sx
How much power is she making? That's impressive that it maintains vacuum while getting beat on.

I'm torn on what I want to do as far as crankcase ventilation on my new setup. I'm currently recirculating into the turbo inlet, but with the new build being high compression turbo I'm worried about it lowering the octane if I keep it the same and causing detonation. Might vent it into the exhaust or just do an atmosphere setup.

Re: Adam's formerly supercharged... now soon-to-be-turbo'd,

Posted: Tue Mar 19, 2019 8:43 pm
by adamky
Oh, its around 350-380 whp on pump gas, close to 500 on E85.

I just started adding ethanol back into the tank after going the entire winter without it. I'm up to 71% ethanol on this tank. I also cranked the boost up to 22 again. She rips!!!!!!!!!

I had some fun the past week or so and while I haven't pushed the dipstick out significantly, it has gotten pushed out a tiny amount. It's like a 16th of an inch, if that. But that's enough to drop my vacuum in my PCV tank from -15 to -11 at idle. It is still working so much better than it was previously. I'm no longer getting the big puff of smoke from under the hood as the dipstick blows out. Now, it's just barely pushing it. I don't see any smoke when it does it either.

There is still a little vacuum in the tank when this has occurred, so it looks like I'm just not getting the blow-by into the tank quickly enough. I'm thinking that a second -8AN line from the valve cover vent (which is currently plugged) to the vacuum tank may fix it. Other options include figuring out a way to lock the dipstick down. Or, I could figure out a way to bump the voltage to my vacuum motor to around 20V, at which point it should pull close to -10inHg. Also at that point, the pumps compressor wheel could explode... lol. Hopefully not, but it was never designed to spin @ 3-4 times the speed I will need to spin it to. And lastly, I could try replacing the motor with one with a slightly higher KV, which means it would spin at higher RPMs.

Re: Adam's formerly supercharged... now soon-to-be-turbo'd,

Posted: Tue Apr 02, 2019 9:58 am
by nelson240sx
Need a video walk around of this thing in action. Want to see/hear the tank charge up and see how she pulls

Re: Adam's formerly supercharged... now soon-to-be-turbo'd,

Posted: Sun Apr 07, 2019 8:08 pm
by adamky
I can definitely do a walk around vid soon.

I have an update on the situation. It seemed like it started blowing out the dipstick more and more easily and I wasn't sure why.

So, for the heck of it, I decided to empty my vacuum tank for the first time in 6 months (maybe more, I'm not sure). Well, I was very surprised to see that it had almost 3 GALLONS! of water, oil and fuel in it (mostly water, of course)!! I couldn't fcuking believe how much fluid just kept coming out. That nasty stuff would have been in my oil...
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Its only a 7 gallon tank, so it was almost half full. I believe that the huge reduction in volume was causing my dipstick to constantly pop out on long highway pulls because the vacuum reserve was being depleted so quickly. I haven't blown the dipstick out since emptying the tank.


That being said, I am still going add a second -8AN line from the valve cover to the tank. I am very confident that the second line will allow the vacuum pump to pull the blow-by out fast enough to keep the crankcase from getting pressurized, even if I crank the boost up more... which I fully intend to do...

Re: Adam's formerly supercharged... now soon-to-be-turbo'd,

Posted: Mon May 20, 2019 7:49 am
by adamky
Well, I have lifted the head several times in the past few months. Time to pull the head and get those steel washer inserts installed.

Re: Adam's formerly supercharged... now soon-to-be-turbo'd,

Posted: Tue May 21, 2019 8:59 am
by cleantune
The projects you've been working on are always so cool! keep up the great work!!

Re: Adam's formerly supercharged... now soon-to-be-turbo'd,

Posted: Thu May 23, 2019 10:10 am
by nelson240sx
It crazy when you see what would normally be staying in the oil if you didn't have the vacuum setup. I get a lot of water condensation in my catch cans. Must be nice to only need to empty the tank every 6 months, haha.

Re: Adam's formerly supercharged... now soon-to-be-turbo'd,

Posted: Sat Jun 22, 2019 7:13 pm
by adamky
I know. It blows me away. I think it's got a couple more gallons in it now. I can tell by how fast the vacuum depletes as to whether the tank is getting full.

I raced a stretched/modded 600cc bike a couple nights ago, and for once, I got some of it on film. Granted, I only got the last part of it on film, but I'll take it... :cool:

https://youtu.be/zBPwDIgfkho

Re: Adam's formerly supercharged... now soon-to-be-turbo'd, S14

Posted: Fri Aug 16, 2019 1:47 pm
by nelson240sx
Looks like you're enjoying it, haha....good stuff

Re: Adam's formerly supercharged... now soon-to-be-turbo'd, S14

Posted: Mon Aug 26, 2019 11:08 am
by adamky
Another Nissan/Infiniti in the family...

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Re: Adam's formerly supercharged... now soon-to-be-turbo'd,

Posted: Sun Oct 06, 2019 9:14 pm
by adamky
This was the odometer readout when I built the motor: 155,111 miles
adamky wrote:
Sun Aug 07, 2016 8:56 pm
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This was yesterday: 175,152 miles
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I have now put over 20,000 miles on the same exact setup that I have been beating the crap out of for the past 3+ years. I'm even on the same clutch and pressure plate, and it still holds the power like a champ!! And when I say I beat the crap out of it, I mean it. It's been my DD for a while now and there literally is not a day that I drive it that I don't do multiple 20-22 psi pulls. Daily. For 20,000+ miles.

The motor still feels good and strong and runs like a champ. I actually just changed my cam timing back to stock this weekend (intake was 5* retarded and exhaust was 5* advanced). I like the powerband a lot better. It lost a little bit of mid range but it pulls like a freight train to redline now. I didn't think it felt as fast at first, but then I realized it was only hitting 19-20 psi now, instead of 22. I adjusted the tune to bump the boost back up to 22 psi and it feels a LOT faster. I was actually getting a little squirrelly in 4th yesterday. Felt great!

BTW, my car has a fairly soft suspension and squats hard during acceleration. With about 100lbs of tools and other crap in the back, it hooks very well considering the mediocre tires I run (BFG Sport Comp II's). If it's just me in the car and I take all of the tools and extra crap out, traction is definitely more of an issue. It will get sideways in 3rd fairly easily/often. So, I actually prefer it with the extra weight of the tools in the back.

One last note, boost-by-gear is one of the best features you can have for a turbo car. There is no way I'd have any traction in 1st-3rd without it. Mine is setup like this:
1st gear: 15 psi (wastegate)
2nd: 17 psi
3rd: 19-20 psi
4th: 22-23 psi
5th: 22-23 psi

Re: Adam's formerly supercharged... now soon-to-be-turbo'd, S14

Posted: Mon Oct 14, 2019 6:41 pm
by EnnEssEnnKAT
Why did you decide to avoid placing more ports on the valve cover and go with the vacuum pump route? Also how did you decide to optimize the vac to neg pressure at all times - I would have thought a little pressure in the crank case is good to resist combustion blow by as opposed to drawing it in with vacuum. I run a breather on the vc and a pre turbo post maf line to the pcv via a catch can, screwed around with a few setups and this one seems to work best for me, wondering what an upgrade to the system would look like.