ka24de vs. ka24det - Round II

[Razi]

Hahah that is awesome.
I want one!

[SiDwAyZ240]

Been thinking about building something like that with my zx6R motor off my bike that's been sitting and collecting dust. Maybe a kart or something like a TRex with a 600cc motor. Zoom....Zoom....Zoom

[homeslicej2]

Hey guys! Just checking in. This last few weeks have been nuts b/t 60hrs of work, school, and clinicals. Good news is, I'm on second shift (1pm-1am) now instead of 7pm-7am. Stoked about that. Oone more month til graduation; hopefully I can sit for my license exam in early June. Dropped the 240 back at the shop for a re-tune. Was spazzing out and trying to die on me at idle on occasion. Was sucking fuel. Sure enough, shop strapped it back on the dyno and the tune was off. We're not sure how that happened. Supposed to be running like a top now, but their driving it some to make sure it's good before I pick it back up.

[Chris28]

Sounds like a hectic schedule, but at least the end is in sight!

Weird that the tune changed itself, maybe the weather affected it? Working on cars is fun, but sometimes I wish I could drop mine off at a shop and pick it back up a week later with everything done to it. Speaking of tunes, my housemate's Supra just made 475/404 on Friday. Tune said it had a lot more in it but for safety/reliability he stopped at 475 haha. It spins 295 ecsta xs's, it's crazy fast.

[Razi]

Sheeeeeeit

[homeslicej2]

Yeah, at those power/torque levels, most street tires are easy to spin. I thought my issue was tune related bc, the injectors had just been serviced by Deatschwerks, the FPR & filter are relatively new, the CTS/O2 sensor/knock sensors/IACV are new, checked the MAF & TPS voltages recently & both were fine, & vacuum/boost leak checked it. I said hmm...I wonder if the tune is off? Wonder if the solder connections for the NIStune were loose/poorly made? Anyway, they said the tune had gotten off. I'll ask for a more in-depth answer when I pick her up.

[Chris28]

[youtube]http://www.youtube.com/watch?v=e4NJTxdH ... e=youtu.be[/youtube]

Had some fun with a friend's car, now if there is only a way to record his reaction...

[Razi]

That's awesome.

[homeslicej2]

WTH? Talk about wiring woes. Figure out what caused it? Picked the 240 back up today. Runs like a top and I've seen a noticeable increase in fuel economy. Apparently, either on the initial tune, or as a glitch in the software after the tune, the stock O2 sensor wasn't enabled inside of NIStune, so that was why it was sucking fuel and running bad. Ran too rich too long. Hopefully this cures the ills

[WDRacing]

No s***, must have run like crap dude. Change your spark plugs.

[krimsonviper]

No s***, must have run like crap dude. Change your spark plugs.

no u

[Razi]

KV butt.

[Chris28]

WTH? Talk about wiring woes. Figure out what caused it? Picked the 240 back up today. Runs like a top and I've seen a noticeable increase in fuel economy. Apparently, either on the initial tune, or as a glitch in the software after the tune, the stock O2 sensor wasn't enabled inside of NIStune, so that was why it was sucking fuel and running bad. Ran too rich too long. Hopefully this cures the ills

Weird, but good thing it's fixed! Haha we wired a spare horn to his 5th gear switch as a prank, it wasn't due to a short in the harness.

[krimsonviper]

KV butt.

What what?

[Chris28]

I'll make a thread when it's all back together.

[Razi]

Yaaay!

[SiDwAyZ240]

Looks good.

[homeslicej2]

DIY paintjob FTW! That's a great prank. I'll have to play it sometime. I already changed the sparkplugs, am ordering a new O2 sensor, and am going to run some Seafoam through the intake this friday. It did run bad.

[SX APPEAL]

Hey guys, in the process of getting my hose routing figured out for my new intake manifold on my KA-T. Just a quick couple of questions, do I have to run the wastegate line directly from the compressor housing? I'd rather run it from the intake plenum so the wastegate will open at the specified boost pressure when the cylinders are seeing it, not when the compressor is seeing it, because of the difference due to pressure loss through the intercooler. But is there any disadvantage to this? Should the wastegate not ever be exposed to vacuum from the intake, would that damage it in some way?

Also for my PCV system, I've just run a line from the PCV valve to a catch can and then to the intake pipe before the turbo. Will this setup be sufficient to relieve the blow-by pressure, or does the PCV valve NEED to see full vacuum from the intake manifold behind the throttle plate in order to work? Appreciate your input

[Razi]

I doubt vacuum will hurt your wastegate, but I think Nissan routed the factory line to the intercooler piping, which is how I have it.

As for the PCV system, it's setup for the intake manifold to suck in air from the lines and it'll stay closed if it doesn't see vacuum.

That's the factory SR setup, valve works the same on the KA though.

[WDRacing]

The way you have the valve cover vented will work. People have been known to just use a filter, so having it vented to pre-turbo is better then that. I recommend using a clear hose at least at some point after the oil/sep. This will let you "see" how much crap is making it into the turbo and intercooler piping. If the hose turns brown in short order, you need a better filter. Change your oil a lot, that's the best way to avoid sludge.

As long as the wastegate is external and not a diaphragm internal type you can use any vac source you want. I use a manifold source for all of my vac, for the reason you stated and to make sure that all of my gauges etc are referencing the same data.

Homegirl, after you seafoam everything, change your oil. This is just the way I do it mind you, but I change the O2 sensor and plugs AFTER I seafoam everything. Consider that you're pouring a cleaner into the combustion chamber. Some of that cleaner and soot is going to make it past the rings and into the oil. Not to mention how smokey and nasty the leftover combustion is after the seafoam sits for 10 mins and then you "run" the chemical out of the motor.

Always add new parts at the end of any process that involves a heavy cleaning. Just my .02

[SX APPEAL]

Yeah the wastegate is just the standard Tial 38mm so I should be good there, thanks for the input. But on the PCV I was actually referring to the valve that comes out of the block under the stock intake manifold, that splits into four smaller tubes that feed into each runner. On a stock engine these would see full vacuum whenever the throttle plate is closed, whereas with my setup, the check valve will never see that much vacuum. So would the system still be enough to relieve the blow-by pressure in the crankcase? I mean I could in theory use the stock system with an individual tube for each runner, but I've heard these are a notorious cause of boost leaks so I'd rather leave them plugged if I can.

EDIT, just to be clear



With my setup, the valve cover port, green arrow, is routed to the intake tube, pre-turbo (pretty much like stock)
The engine block oil separator/PCV valve, red arrow, is routed to an oil catch can and then also to the intake tube pre-turbo. Normally this would be connected to the intake manifold by the four small tubes underneath each runner.

So with this setup, do I have anything to worry about with excessive crankcase pressure?

[WDRacing]

Nope, should be good to go.

[SX APPEAL]

Cool, thanks

[krimsonviper]

Whatever happened to FrankEBones?

[Razi]

Busy and stuff.
He's collecting parts for his KA-T setup.
I'm gonna go to his house and help him install shiz sooner or later.

[SX APPEAL]

Another quick question guys, trying to find a good place to run a coolant feed line to my turbo. I wanted to use the stock temperature sender location since I have an aftermarket gauge in the upper coolant hose now. But that location has 12x1.25 threads and so far I haven't been able to find a hose barb adapter for that size. Another possibility I'm considering is the coolant plug on the left side of the block, shown here:



However, would there be enough flow pressure from this location to pump coolant up to the turbo? According to the diagram below, that plug is in the section of engine block water jacket that has just received fresh water from the water pump, but would there be enough pressure to create any flow, or would the water in the turbo/lines just stay stagnant while the coolant follows the normal circuit?



Of course the easiest thing to do would be to tap into the coolant passage going to the throttle body, since this is hardly necessary, but the intake manifold I'm using doesn't have the hose nipple for this circuit. Was this only used on S14's? Because the manifold I'm using is built from an S13 manifold, which is, I'm assuming, where the difference is coming from.

So that's where I'm at right now, do you you guys know of any other clever points of tapping into the cooling circuit for the turbo coolant lines?

Edit:

Or I guess I could just tap into the heater core circuit with a couple of these huh?



Why do I always have to make things harder than they need to be...

anyway, thanks for looking, carry on...

[WDRacing]

I was gonna say, why not just tap a heater line...lol. Work smarter not harder, something my first Military Supervisor used to say to me all the time.

Oh, I just got a new-to-me 99 BMW 540i, V8 Auto.

[SiDwAyZ240]

Damn WD, moving up in the world. What are you looking for a reason to give up on your S14?

[WDRacing]

I needed some of that Kraut sweetness!!!