slapbetcommissioner

iTrader: (3)

curious what your getting for spool on that z57 haven’t seen anyone post much in the way of dyno numbers or boost curve charts.

ECaulk

iTrader: (6)

It can come on hard and fast, the wastegate seems to have more control than on the 6758, at least comparing my car to Colodude's.

The EFR frames are the same size, but the compressor diameter to turbine diameter is larger for the 6758 than the 7163 (1.155 vs 1.130), the spool characteristics are essentially the same from a peak boost standpoint, but the 7163 outflows the 6758 by a bit. Even Borg Warners data says 500hp for 6758 and 550hp for 7163. Also the housing A/R will have a larger effect and I don't think ZZP has ever released that data

Now the z57 doesn't spool crazy fast but I can go off throttle vacuum to ~18psi in about 800rpm (2nd gear start at 4500), but I'm also not trying to spool faster although I think I could get that down closer to 500rpm if I wanted (I have my wastegate duty cycle pretty low in the low-mid load areas to tamper the snap boost)

slapbetcommissioner

iTrader: (3)

Isn’t cooldude running an lsj? Maybe I’m thinking of someone else.
ar and wastegate would make some Sense. Just early dynos/and boost curves suggested the 6758 started coming on at like 2000-2200 rpm without ramping and the 7160 was coming on at like 2500ish. That being said everyone tunes out that agressive 6758 hit and the 7160 is doing it naturally. The 7160 would be moving more air than the 6758 at that point I would imagine. Probably by 3krpm

ECaulk

iTrader: (6)

He's a LNF.

I think the first 6758s came out with a crazy high pre-load and some people weren't dropping the wastegate table to 0s to see where the preload is actually at. My z57 came preloaded at ~14psi (going from memory, put my tuning comp away)

AfterShok

Now my thread is about the Z54 vs Z57 however I am curious if you could tell me the major differences between the Z57 and 6758? I know the Z57 is supposed to be similar to the 7163 but it would be good to know the difference for the added ~600$ USD.

ECaulk

iTrader: (6)

The main difference I'm aware besides airflow of is the zfr6758 is a steel CHRA and the Borg Warner unit, the z57 is aluminum and not a Borg Warner branded unit. Not sure how or who ZZP sourced them from.

The way I looked at it was if I get a year or two from ZZP's CHRA I can always buy a 7163 supercore (CHRA) and bolt it together.

slapbetcommissioner

iTrader: (3)

The zfr efr core is also dual ball bearing vs the journal bearing of the z54/57
i believe they had to make the inducers 2-3mm smaller on the z series vs the zfr counterparts to make them a little more responsive to make up for the lack of ball bearings. Peak hp is a bit lower on the z series because of that.

ECaulk

iTrader: (6)

The z57 has the ball bearings

slapbetcommissioner

iTrader: (3)

My bad. Didn’t realize they changed the formula on the bigger setup. Very cool.

ECaulk

iTrader: (6)

It's also the aluminum housing vs the steel so it really is like a in house clone of the efr. Now i'm sure the ball bearings and exhaust wheel material is different, but still a decent clone

DeanSsspsh

This thread is awesome. I started off thinking z54. Leaving considering z57 & valve springs. This is what boost is all about

slapbetcommissioner

iTrader: (3)

you were saying the efr super cores are useable with that housing?
didnt realize how much work they put into the z57. That’s good info.
yeah I doubt they are made of the same exotic metal as the efr but still ultra light.

slapbetcommissioner

iTrader: (3)

do it!

ECaulk

iTrader: (6)

I'm assuming they are from a visual inspect they're damn close to the same thing. I haven't directly compared them by measurement (should have when my car was down and my friends STi that has a 7163, worse case I pull the z57 and then pull my friends 7163 and do a compare)

ECaulk

iTrader: (6)

At the very minimum do the z54 and valve springs, the additional 500-800 rpms is so nice. Now if you're going to be shooting for a 7500-7800rpm redline you have to get some additional parts.

DeanSsspsh

Gonna take a few months to get the paper right but I'm gonna do it man! For sure
I gotta figure out how to do the springs gonna do allot of research. Then I have to source the tool. I was reading today about the string method. Totally gonna figure this out. I've seen a few videos on how hard the 7163 hits @ the higher rpm range. Now I understand springs are gonna be mandatory. Thanks for the heads up ECaulk.

slapbetcommissioner

iTrader: (3)

To go from your ko4 falling on face at 5400rpm to 7k power all
the way will be crazy

slapbetcommissioner

iTrader: (3)

The lsj even making less power always managed to pull away by the top of third. Gotta love the wider power band.

DeanSsspsh

YA man. Can't stop thinking about it. My mind is in constant boost heaven. This is gonna be nuts. I'm hoping the Indy firehawks I love are gonna still hold. Probably not. Tires are gonna get expensive!

ECaulk

iTrader: (6)

It's surprisingly easy to do, just make sure you aren't 100% reliant on getting the springs and/or the turbo done over a weekend (your only transportation). Having a backup plan takes the stress out of doing the mod so you can take your time and double check everything, I should of noted earlier you have to pull your cams (obv for some but just wanted to clearly state you have to). I did my timing parts at the same time and went to S2 cams

It is so nice

slapbetcommissioner

iTrader: (3)

Yeah man. Even the turbo ended up having my car down for two weeks. Bolts were seized for days and I ended up having to saws all the heat shield bolts off to access 02 housing bolts. Then 2 of the turbo manifold bolts stbapped. Ordered new studs but even with heat they would extract and ended up breaking another one. Had to order a new manifold from zzp. So even though the actual install time was about 6 hours the shipping time was allot haha

AfterShok

Oh man that is 100% my worry. Every part I have installed so far has had a stubborn bolt.

Damn I honestly cannot decide as they both seem like reasonable choices!

AfterShok

@ECaulk any Z57 updates

ECaulk

iTrader: (6)

It's still running just fine, haven't put my summer tires on yet, Colorado likes to sneak in a late snow sometimes and life has been a little crazy. I'd have to look at how many miles I've put on the turbo so far, it doesn't get a lot of WOT pulls during the winter but it still gets 12-15psi rolled in multiple times a week.

Tdubbs

I'll add to this thread, and say go with the Z57

I bought one of the first Z54's, and it grenaded in 10k miles, most of which was all highway mileage (drove for work temporarily and had work logs for proof). After a bit of a fiasco with a bunch of other units detonating, they warrantied them all and added whatever improvements they found from the failures. Warranty unit was installed early 2018.

Here we go earlier today that one bit the dust. Merging onto the highway I had it around 10psi when I was suddenly greeted with a clunk, loss of boost, and the sound of a hair dryer. Babied it home, pulled the intake, and the bearings are completely fried. This unit has over 10k, need to double check mileages.

Fortunately, oil looked clean, filter didn't really have many fines, and there doesn't seem to be anything that made it past that first 90* off the turbo.

Edit: Should check my exhaust and see if I have a turbine wheel in it