Chiburbian

iTrader: (1)

New turbine housing before:



After:


I'll post some pictures from the manifold side tonight when I see it in person. The guy who ported it couldn't get a good picture on the potato he was using to take the others.

Chiburbian

iTrader: (1)

I got the car pretty much assembled today and drove it home. I figured I would take a few pics of it with Tungsten 6ULs.

Once I wash and wax it I will take some better pics.







I somehow lost my vacuum line from the EBC to the turbo outlet nipple and I somewhere lost my power steering belt, but otherwise it's all together.

Chiburbian

iTrader: (1)

I haven't driven it much because of the little problems that have surfaced since I put it together, but I am squashing them one at a time.

I had a problem where on corners and on acceleration I was losing power and jerking. I found the problem: Make sure your battery hasn't slipped! I had a problem where on corners and on acceleration I was losing power and jerking. I found the problem: Make sure your battery hasn't slipped! You can see how I was arc'ing to the battery hold down enough that it actually ate away part of the hold down!

Chiburbian

iTrader: (1)

Now I am having problems with boost.

Tonight just befor I got home I got on it full throttle in 2nd gear and couldn't hit 2psi.

I can't find any obvious boost leaks and BOV does work to some degree. I'll put it on jack stands tomorrow and take a good look at all the charge piping.

aidandj

iTrader: (5)

Happened to me the other day. Turns out it was a loose wastegate actuator.

Chiburbian

iTrader: (1)

That's another thing I wil check.

patsmx5

iTrader: (16)

Just read last page of your thread...

Regarding boost, MBC will give you flat boost. On MS either used closed loop, or don't use it. If you really want EBC, you can buy one down the road. Having boost that doesn't do what you want is how to break a motor!

Regarding the engine tuning for power and reliability.

For maximum power AND reliability on a stock engine:

Install big turbo, run high boost (15-17 PSI)
Keep fuel on the rich side (I ran 11:1)
Keep timing super safe/conservative.

High boost gets the mass flow going for power, lots of fuel effectively retards timing (slows the burn) while reducing EGTs and conservative timing.

If you plot cylinder pressure vs crank position, tuning the way I just described will make keep peak cylinder pressures down (what breaks/bends stuff), while average cylinder pressures higher (makes power).

For absolute maximum power, tune fuel to about 12.8, then start adding timing till you get detonation or hit MBT. You'll detonate in boost most likely first. But you can't do that, if you do you'll bend rods at 230-250whp where you could make 300whp with better reliability keeping it high boost/rich/conservative timing.

I ran 17 PSI on a GT3271 with 550cc injectors at 100% duty cycle on a stock 99' motor reving to 7,800 and it never broke from power for a year of daily driving/beating on it. It died from the harmonic damper bolt vibrating out and destroying the keyway in the crank.

Braineack

iTrader: (62)

tuning for 12.8:1 is how you break a motor.

18psi

iTrader: (76)

I disagree. I can post lots of when I ran my mbc and it was a lot less flat than my current EBC in Open Loop. It would get to 10psi more lazily, and then start tapering toward redline. Currently with Open Loop it shoots straight to 11 and holds that all the way to redline. And yup, Open Loop, I've been lazy and haven't even tuned CL.

Agree about the high boost + fat afr's + super low timing if you want to make the absolute most power on a stock LB. This, however, is ONLY true on a HUGE turbo. Try the same on a small one and you'll still break well before the 300whp mark.
Not even going to touch the 12.8:1 afr part cause that's just nuts and should not ever be done unless you're tuning a DI engine.

So the engine was completely and utterly perfect when you yanked it? Literally the only thing wrong with it was the crank keyway? Cause I vaguely remember you saying you broke that one too? Maybe I'm mistaken, I'd need to check my emails. If it was otherwise undamaged, that's pretty cool.

Chiburbian

iTrader: (1)

I'll look more into the "max powah!" aspect after I figure out the rest of this mess. The nose is coming off the car today and I am going to check all the charge piping and also try and work on my ducting. I was hitting 218 degrees cruising with both fans on last night, not even pushing it. When I turned on A/C it crept up to 2/3 of the gauge before I shut the A/C off. It was so nice having a nice cool cabin while it lasted though

Honestly, the power I was experiencing before pulling the turbo to be ported was perfectly fine. I realize I could have just let it creep/spike and I might be have been ok with a proper tune, but honestly I don't trust myself or my tuning abilities to tread that fine line.

Mazduh

My guess is you probably need to burp your cooling system. Maybe air bubbles somewhere in there. I don't remember what fans your running.

Chiburbian

iTrader: (1)

I am running the fans you hate. (Mishimoto). I will try burping it again.

Mazduh

Throw them out, they're junk.

Go back to OEM for the time being or pull the mishi fans from the shroud and order some SPAL fans to mate up to it.

Chiburbian

iTrader: (1)

I know you hate the mishimotos but I have never had a problem with them keeping my car cool when sitting. It's only when moving and that tells me that it's a ducting problem rather than fans.

blaen99

iTrader: (6)

I had a similar problem, Chiburban, except that also impacted me with stock fans as well as the cheap-o aftermarket.

I switched to FM's fan+shroud combo, and a Beatrush undertray. Fixed all of my cooling issues.

Chiburbian

iTrader: (1)

Does that panel negate the need for the stock under tray? What about the plastic panels that are on the sides of the front bumper cover and into the front bottom of the wheel wells?

patsmx5

iTrader: (16)

Well for me, I always had a dual port external 38mm gate, and with that, a 20 dollar Ebay MBC was flat within a few kpa, and a low pressure paint gun regulator kept it withing about 1KPA plus or minus. I've seen people with open loop have boost change when the weather changes for comparison, not sure if you have this problem though. This was never a problem with any MBC I've run, they are solid and reliable in my experience.

Yeah I'm not saying for anyone here to run 12.8:1 in boost. Just saying that is, more or less, the best AFR for power IF YOU CAN RUN IT WITHOUT DETONATION. If you were burning race fuel, for example. Or water injection. I've done a lot of research and some testing (aka broke **** and went fast) and if you can supress the detonation the motor makes more power around 12.8 than it does at 10:1 or 11:1. It burns faster.

Vlad that old motor I bent the rods in it with nitrous, I've told this story here before. I bought the miata, put nitrous on it, had the controller mess up at the track and blew a HG/bent a few rods. I replaced the HG but it still vibrated/had slightly lower comp on a couple cylinders. Boosted it anyways. Motor looked fine when torn down, still had same compression as it did before, just a few bent rods which explained the vibration, the vibration is actually what caused the harmonic damper bolt to vibrate out and trash the keyway in the first place!

Short story is I've run 17 PSI on stock longblock, and 28 PSI on rods only longblock both with a GT3271. And while I've broken **** along the way, these motors are pretty damn tough all things considered.

patsmx5

iTrader: (16)

Confirmed, I broke a motor doing this. Was also going fast though.

Chiburbian

iTrader: (1)

Update: Nose coming off tonight.

Decided I am going to put the stock injectors, MAF, and ECU in and hope I pass emissions. I can't afford to wait any longer in case I have problems.

patsmx5

iTrader: (16)

I pulled the SC when I went to pass emissions. Are you leaving the turbo installed?