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iTrader: (3)

I know you had boost ramping ecailk. But what kind of spool characteristics did you both experiment with the z57? When did it start to light and how would you compare it to your z54 in that regard

ECaulk

iTrader: (6)

Let me dig through some logs on my old tuning laptop later today, I had one local I tuned with a z54. I can post up some comparisons for the boost. The z54 was certainly more aggressive as the owner said he didn't care if the transmission went, and I was trying to keep my transmission together.

Tdubbs

I had PWerks tune both. The first Z54 had to basically be maxed to even get 24-25psi, and it still spooled slow. The second Z54 spooled rather quickly, pegged 29psi on same tune the other struggled to make 25 on before Dave turned it back down. Both were definitely slower than the K04.

IDK what ramp is set with the current tune on the Z57, but if I floor it at ~3500rpm in second, by ~3800 it's already lighting the tires up. With traction from my new tires it can actually just hold back full wheelspin in 2nd. I basically said to him at this point if the trans grenades it grenades. I was going to let the GMPP be the weakest link between, but it's still holding nicely so the thing rockets along. Spool is a lot closer to stock characteristics vs either of my Z54's.

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iTrader: (3)

Okay so the bigger bb is a better spool than the z54.
aounds like your first z54 was hurt right off the hop. The second one is more in line with my experience.
Later in my current ones life it started behaving more like your first one. Almost felt like the waste fate was occasionally not doing its job and making it super slow to spool. Obviously now it was actually the bearing dieing.

AfterShok

Damn sorry to hear about your guys luck. Brutal how they don't last.

I truly waited until I scored the 6758 and it has been an absolute beauty! Previous owner claims 25k miles on it and I have put now around 2k kms which is not even 1k miles. It is on a boost ramp to 27psi and when I step on it around 3k rpm it starts the ramp at almost instant 15psi and climbs to 22ish psi by around 4k and then sees 25 by 5k and 27psi at 6k till redline.

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iTrader: (3)

Yeah I regret selling my 6758 I had picked up used. Never installed it. Made a few bucks selling it but I wish I had just installed it

ionRL_585

Ugh that sucks guys. I have about 2k on it finally and no issues yet *knock on wood*

Gapped 2 Civic Type R's, scatpack, and some scoobies. Cars and work have been a needy bitch so haven't had a chance to get her out.

She now has ZZP Mounts all around, Napa CV shafts, AC Delco LCAs, New Ac Delco plugs, etc..

I hope my Z54 has better luck than you guys 🙏

slapbetcommissioner

iTrader: (3)

My new z54 should be arriving from zzp this week. Well technically it’s rebuilt but by the sounds of it not much was re used as the exhaust side was damaged. So basically a new turbo. All 2.0 revisions added.

Monieg5gt

Nice keeps us posted on when it comes in brotha. Especially once installed back on the car.

ionRL_585

damn bro that sucks man...how long ago did you buy it again?

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iTrader: (3)

I sent it back for rebuild a couple weeks ago.

ionRL_585

for sure but just curious what date/year you bought the Z54. Mine was only a year and some change ago so I wonder if I got the updated version..*knock on wood*

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iTrader: (3)

I purchased it winter of 17 it was on my car fall of 18. I only summer drive it I put about 6000 miles on it. (Only drive it for a couple weeks the first year) so two oil changes at 50% or more on oil life counter (do one every spring regardless of miles)

slapbetcommissioner

iTrader: (3)

I’m not sure when they made the last revision on it. Zzp would probably be able to tell you if you ask and give them your order number

ionRL_585

Awesome bro. Let us know when you get her back from them.

Tdubbs

I'm definitely interested in where these turbos have gotten to reliability wise.

I had one from the very first batch, and it bombed out in 1yr/10k miles of mostly highway cruising for work waiting for my company vehicle. They warrantied it and I got about 12-14k out of it over 2 years before it blew the center out again.

I also noticed the Z57 is still a journal bearing turbo still after stopping the BB version. Does anyone know why they stopped the BB version, or haven't gone back to it yet?

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iTrader: (3)

I asked about possibly switching to the z57 with bb. They said people have been opting for the journal because the bb we’re having oil pressure issues (they are still working on) also they don’t have any bb due to supply chain issues so it wasn’t an option anyway.

Tdubbs

Well that most likely explains my oil burning and oil stain between the cartridge and exhaust housing. I basically condemned the turbo or my exhaust valve seals after checking everything else, but never had an opportunity to pull the back half out and verify.

Outside of that the Z57-BB is an absolute monster and has no issues, so if I can swap in a different restrictor if they figure it out that'd be fantastic.

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iTrader: (3)

That might be a good call if you can rig something up. Maybe zzp has a solution. Email them Ryan is good to deal with.

turbo showed up this afternoon. Doesn’t look like a single part is from my original turbo. If I had to guess it’s brand new.

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iTrader: (3)

Both housings look a little different to me. Like nicer looking than before. Smoother angles towards the exhaust wheel and hot side of the intake. Beefier looking waste gate as well.

ionRL_585

Awesome brother, sounds like you got a good one finally lol. Let's keep our fingers crossed. I just took her out yesterday and the Z54 is still going strong!

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iTrader: (3)

Okay so a little update.
turbo went in a couple weeks ago. All went well except for the port that goes from the valve cover to the turbo didn’t have the same fitting as the old turbo so the line wouldn’t fit. We resolved this with a piece of clear tubing zip tied instead of the nice clip on piece.
zzp at first thought I was losing it I think. when I asked about this. Two weeks later got some pics of it and I think we got to the bottom of it. Somehow the ltg nipple got installed on the cobalt turbo. Easy enough mistake it’s the same spot on an almost identical turbo (they are sending me another fitting)

rewind to installation day. Added coolant took some screwing around to get an airlock out of it but we got it done. And then realized after the fact there was a tiny coolant leak on the return. Luckily it was just a quarter turn loose as it was an awkward spot with a tiny wrench it wasn’t torqued as much as I thought. A couple coolant burns o my forehead she was taken care of lol.

so warmed her up made sure fluids were good. (Pre primed oil in turbo)

we took her for a ride and data log. For like 30 seconds it felt mint. Rolled onto the throttle at about 1-4 psi torque was there felt decent. Then started to make a small backfire noise followed by random misfires on all cyl 1 and 4 being much worse that the other two. I just coated till it stopped farting. Checked cel (random misfire codes and a map sensor code. Cleared it and the car went back to running okay. Went for a causal drive. Followed by one 2/3 throttle pull. Felt good. Did it again but got into it a bit more. Right back to misfires like crazy and a map code.
so I gently limped her back to my buddies shop where ut had to stay as we were out of time.
I ordered new spark plugs and 3bar maps as I was quite sure the oil and coolant form the turbo failing probably ruined the maps (they fail often as it is) and logical the spark plugs might be Fowled. Have about 60k km on them. Can’t hurt.
Couldn’t get the o rings for them locally so I had to get em from CED and wait over a week followed by not having time to get out to fix it.

we had done a compression test before realizing the turbo was the culprit but I decided to do a leak down test while doing plugs. Piece of mind and all that.
pretty much 100% almost no detectable leakage and compression test was 150 across the board from the time before. Pretty confident engine is healthy.

so last night got her all back together. Plugs map sensors. Looked everything over one more time and went for a log session.

much better start. Car ran and drove normally. No map codes or misfires out of boost.
it did feel a little bit laggy but I wasn’t sure if the new turbo being a redesign may just feel a bit different.
So I did a couple of 3/4 throttle pulls. Seemed to be okay. Started pulling good.
So I decided to do a wot pull in second.
I was watching the boost gauge while doing it. I noticed it was clearly going to exceed 26 psi which is a fair bit higher than 2nd gear was tuned for. 22-24 in second.
as I let off it started popping and farting out of the exhaust a couple random misfires logged. No cel.
so I decided to to a third pull and keep a close eye on boost.

by 5k rpm it was flying up to 30 (suppose to be 26 spike 24 till redline)and I let off but not before the ecu cut throttle. Misfires galore and popping and farting out the exhaust. car was barely drivable for a 20-30 seconds after this happened. I let it settle and nicely drove it back to the shop. We did another look over to make sure everything was as It should be and it seems fine. Clear code it runs fine.

anyone have any insite as to why the car would be over boosting so much?
ryan at zzp said the tune shouldn’t be any different between the turbos. I have already sent the log off to my tuner he hasn’t had a chance to look at it yet.

Also for logging Map pressure on hpt does anyone know what perameter that is. I seem to recall there is two. One only shows to 255kpa (same as original stock) and the other shows actual. My logs only show up to 255 so I think I’m monitoring the wrong one.

ECaulk

iTrader: (6)

The only thing I could think of is more pre-load on the wastegate with the new turbo than the previous. Have your tuner drop the wastegate controller to 0 to confirm what the wastegate pressure is set at.

slapbetcommissioner

iTrader: (3)

Yeah we will definitely go that route thanks Ecaulk.
i know he knows what he’s doing he hasn’t looked at the log yet and given his two cents.

what map sensor perameter should I have for logging ecaulk? I know you’ll have it right off the top of your head hah

ECaulk

iTrader: (6)

You should be looking at the LoRes sensor (that is the one in the charge pipe) as it can be viewed above 255kpa vs the intake manifold map sensor that is hard coded to max at 255kpa. Also don't forget to log the baro so you can subtract the baro from the LoRes sensor to get the boost pre throttle body