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HybridZ

GT58 Ball Bearing Turbo on an L28?


jgkurz

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Hi all, I was offered a potentially sweet deal on new turbo for my Z. I am friends with a local Audi/VW/BMW tuner shop. that does custom turbo kits and EFI's. They have an extra dual ball bearing GT58 turbo that they offered to at cost. All their turbos are done by Innovative so I'm confident it's a quality unit. Below is a list of my engine specs. The turbo I currently run is a Jim Wolf Sport 400 AKA T04E 50Trim Compressor with a 10 blade stage 5 wheel - .63 AR turbine housing. It spools very quick, but doesn't have room for big HP.

 

Is a GT58 too big for my setup? I don't want a car built only for top end power. I'd like full boost in by at least 3K if possible. The car will be used on the weekends for road trips to the beach, autocrossing, drag racing and a track day at PIR occasionally. Someday I'd like to make 500 flywheel HP or more and I know my current turbo is wrong for that goal. Am I asking too much? Do I need to settle for a car that does one thing great, but not both?

 

Thanks

 

1982 L28ET Block 2999cc

87.5 bore

83mm stroke

Crossdrilled and balanced diesel crank

7.6:1 JE Pistons

Full floating wrist pins

SpeedPro Plasma Moly rings

Race prepped late L24 rods

ARP Rod & Main bolts

ARP Cyl Head studs

O ringed block

Mildly ported P90 head with backcut valves

ISKY 490 turbo camshaft with Crane springs

N42 Non EGR Intake with major porting

Weber 60mm Tbody

Nissan competition oil pump

Scottie downpipe with 3 inch mandrel exhaust

Maxima hi flow water pump

Electromotive Tec3 EFI

TurboXS BOV

440cc injectors - Will go bigger when needed

NPR IC with 2.5" inlet & 3"outlet - in process

Custom fuel rail with adj FPR - in process

Walbro 255 lph fuel pump - in process

External Tial wastgate - in process

Blitz SBC Type R boost controller - in process

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