LNF upgraded turbo

[Indy Lonnie]

I’m looking into sizing up my stock turbo to a zfr6758 or Z54. Anyone have pics of their turbos mounted? I know the ZZP 6758 kit has a longer outlet welded on. I was wondering if the “stock” Borg Warner outlet would allow for the LNFs stock K04/ DF layout to be used that DF has already engineered. I know the intercooler and radiators will need to sized up. I believe one of our members has already done some of this... As of today I plan on using the ZZP exhaust housing.
I would love to learn from anyone else that has done this... What other upgrades to their engine have they done...(springs, fuel, rods, pistons) Any pics or tips would be appreciated!

 

[JBINTX]

Charles did the Z54.
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[r3drckt]

I did the LSJ-T swap with a z57 turbo. The charge side outlet was too long so I cut it down. I also had to clock the charge side housing so it angled under the cross member. More pics in my build log. This kit uses the LNF turbo manifold which is why I wanted to chime in.

before clocking:

After clocking:

 

[OptimizePrime]

@Indy Lonnie I have a 6758 with a bunch of pictures in my build thread. If you're doing all this work, I'd spring for the 6758 over the z54. I purchased mine used and it looks like it may have been an early version as there's a vband on the outlet like @r3drckt whereas now it looks welded as you mentioned. You can re-clock the compressor to achieve whichever angle works best for you using the vband you see in the pics above. I wouldn't go under the bar as it's pretty restrictive and just annoying to deal with.

As far as other mods, I would option for the high boost wastegate and get a forge bpv with correct spring rates. I would also move the stock o2 wideband to the exhaust as they foul when you really push this turbo. I would not get stage 2 cams from ZZP but I would get the #80lb springs and titanium retainers from OTTP. If you haven't already, I'd get all the other supporting bits too (3bar map sensors, hptuners, opel injectors). If you're running E, I would get just the Fuel Lobe intake cam from ZZP. If you're not running E, don't worry about it.

I put down a conservative 400whp at 26-27psi with virtually no changes to stock timing on 93 - I was leaving a lot on the table. Powerband was about 3,200-7k. This amount of power is sufficient for 99% of Goblin people and driving events, if you want more you could just clip on a 7163 and retune. A lot of Cobalt people say the trans is the next to go over 400whp, but I don't how the story changes with the Goblin - just something to be aware of.

 

[Ross]

@OptimizePrime, What cams would you recommend? Why don't you like ZZP ones?

 

[Gtstorey]

From a pure power stand point, it's cheaper/easier to just push more presure through a turbo than to upgrade cams. Of course this may affect spool time. If you are going for the absolute most power you can squeeze from a motor w/turbo , then you start talking cams and head work but if your desired power level is obtainable without the cam, the money is better spent elsewhere.

 

[OptimizePrime]

@OptimizePrime, What cams would you recommend? Why don't you like ZZP ones?

The current run of Stage 2 ZZP cams are breaking rockers at high RPM and carry the risk of spinning the reluctor when hot. The S2 cams give maybe 10whp and to @Gtstorey's point, you can make that up in a lot of other ways that have other benefits that cost the same (ex. Meth). I purchased the cams as part of a package, but have reverted back to stock.

Tinfoil hat time: I think ZZP is purchasing their cams through Alibaba, they no longer have Comp cams grind them that's for sure.

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