96 5vz xcab 4x4 TACO TURBO BUILD

Makes sense to me but either way I seem to be running too rich or too lean.

 

A little update. I got done installing my pre-turbo oil cooler today. The lines went like this from engine oil port to turbo:
3/8"NPT-1/8"NPT reducer>1/8"NPT inline restricttor>1/4" SS/nylon braided hose>oil cooler>1/4" SS/nylon braided hose>turbo.


Then a touch of plastidip (the shade distortions are undried plastidip)


255 walbro install maybe tomorrow.

 

Didn't realize you were running the larger Supra MAF. How are you compensating for it? I glanced back through the thread and didn't see if you were using some kind of piggyback or not. Bigger MAF housing means the engine thinks it's inhaling less air than what it really is, causing it to inject less fuel. Or am I missing something? What do your Long Term Fuel Trims look like? Any check engine lights?

I don't think the wastegate is supposed to see vacuum either.

 

No codes at all and the the truck runs north of decent. I have 318cc injectors swapped in for the primaries to deal with the supra MAF. That's probably why my full boost AFRs are low to mid 14s with no tune.




I don't think the wastegate is supposed to see vacuum either.[/QUOTE]
Some people do hook it up to the intake mani but it's nothing but wasted boost in reality. I could imaging some couplings often blowing off because of that.

 

Gotcha, I'd still be curious to know what your LTFT's are. Pretty much that's exactly what I plan on doing. Have we already talked about this in another thread somewhere? I can't remember. I'm using this Specter MAF kit I found that's lets you change out inserts to adjust the diameter of the MAF housing. The aluminum housing is 3", and has 2.75", 2.5", and 2.25" plastic inserts. Believe stock is 2.75", so the 3" should match up nicely to the green top injectors found in the non-turbo Supra motors.



Got the rest of my intake last week. Whole thing should look something like this:


I found some of the green top injectors at the local pull-a-part. Found them in a Toyota Cressida, which shares the same motor as the Supra. Lucky me, some one got to the motor before I did, and took the entire top end but left the fuel rail and injectors placed neatly to the side.



Thanks for letting me piggy back off your build thread, I should probably get around to making my own, lol.

 

What's the specs on your turbo?

 

No prob dude. That intake pretty much looks exactly as I imagined... sexy that is
not too fond of the specter MAF kit because I have the old school one piece solid MAF. It will be a lot easier to have the truck run lean right now and richen it up to where it needs to be with the additional injectors (in my case anyway). It sucks that we have to wait for the ECU to learn and work around mods to make the final adjustments but that's toyota for you. Never discussed this before I don't think.
And by the way how are you going to fit the downpipe to that exhaust housing on that turbo? Do they make a small profile 3" Vband adapter or something? You only have about an inch and a half to work with in some spots before the downpipe hits the firewall of the truck.

 

Not sure man. Are you doing any tuning at all? Your ECU is fighting to keep the AFR at 14.7 so until you start scewing the AFR data with a piggy back, your AFR will be a total shit show

Been reading up on the FPR. Should be ok pre TB but would be better post. You will see weird AFR's every now and then with Pre as the TB opens and closes and BOV releases pressure as these cause the boost in the manifold and boost in the intake piping to differ.

 

I've got one of these from Treadstone Performance sitting in my box of turbo related parts:


http://www.treadstoneperformance.co...-Band+Adapter,+4+bolt+(T31)+2.5"+to+3"+V-Band

It could be a little tight, but hopefully it'll work. If not, I might be hammering on my firewall lol.

 

Garrett T3/T04E, 57 trim, 0.63 A/R. It might be a little in the small side. Originally I was planning to do a rear mount, so I got it a little small on purpose.

 

I'm

The fuel trims are very consistent actually. Im guessing that is because there are multiple ways to determine fueling (O2 sensors, MAF and temperature sensors).... The ECU hasn't seemed to hiccup at all except for startup, and that is fixed by tapping on the gas a couple times and letting it warm up. As long as my MAF and O2 sensors work, the truck will run fine. Heck the truck drove decent with fried O2 sensors and newly installed 33% bigger injectors... It even passed emmisions (with the help of a splash of pure ethanol ) From what I have read, the ECU can fix a lot of problems itself, but my only real problem now is getting those WOT AFRs down to 11.5. In the mean time 14.2 is fine for 4.5 measily PSI on a damn near bullet-proof toyota engine. I'm not worried about anything at this point.

 

If your exhaust housing is similarly sized to mine then you should be fine with this adapter. Of course a 4Runner firewall could be different than a Tacoma one and everything being said about it here is for nothing lol

 

I must say I disagree that 14.2 AFR is ok for 4.5 psi. I'd pretty much want 12.5 and below as soon as I see boost... 14.2 still seems too lean to me for any boost. These motors are tough but any motor will more than likely suffer if running lean in boost.

 

Yeah, that's what I'm scared of. I tried a couple of search terms in Google to try and research, but didn't come up with much. I wonder if Gadget knows? If anyone knows, he would. I may call him up and pick his brain.

 

I'm not keeping it like that for very long... but the occasional highway merge for now isn't going to hurt anything.

 

x2. However, as long as you aren't hearing any pinging should be ok'ish. Would hurry on that AEM FIC purchase though.

Thats what I was thinking. Might have an issue with the cross over pipe. I remember a reading the 4runner 5VZ has a few less HP than the Tacoma 5VZ due to a different exhaust setup

Gio, are you watercooling the turbo by any chance? If so, can you post a pic of the setup? Thanks.

 

Mile-high fall/winter 4.5 PSI is the same as like 1.5 PSI of normal sea-level weather on an engine, so I'll say again... I'm not worried about it right now.

No water cooling on this end. I don't feel it's necessary on 8~ PSI on a DD.

 

Yeah, Ive been debating the watercooling. I think Ive figured out how to do it easy though, just need to make sure the hose sizes work.

 

Messing with one extra vital fluid scares me. I shat bricks over learning that I had to mess with the oil when I first got into turbos

 

Gio, my wastegate adapter to go from 2-bolt to vband came in. Looking at your setup, do you think spacing out the wastegate slightly would cause it to conflict with anything?




At this point, pretty much the only thing I'm missing are the manifolds, but they're out of stock