Sean73 Posted September 23, 2004 Share Posted September 23, 2004 Here's where I am at so far. 400 miles on this setup. Breaking it in at 7-10 psi. L28ET F54/P90, Stock Rebuild P79 flattop pistons (8.8:1 CR) Deves Rings Clevite Bearings Fel-Pro Headgasket T3/T04E TurboCharger 57 Trim .63 A/R Exhaust; clipped turbine, .50 A/R Compressor Oil & Water cooled through teflon stainless lin es. Manual Boost Controller Saab Viggen Bosch BOV NPR Intercooler 2.25" mandrel plumbing, ceramic coated Hosetechniques Silicon Connectors T-Bolt clamps Engine Management 1984 300ZX (Z31) Turbo ECCS Z31 Harness modified for S30 body Z31 CAS, Chopper Wheel, MAF Ignition Crane PS60 Coil NGK BPR7ES-11 (one step colder) spark plugs gap .040 Custom Taylor spark plug wires Intake Custom 3" Intake Plumbing Mandrel Bent Stainless Steel Apexi Cone filter BOV recirculated modified N42 Non-EGR Intake Manifold Weber 60mm Throttle Body Relocated PCV valve Relocated Air Regulator Fuel OEM Z31 Turbo injectors; bench flow tested OEM 280ZXT Fuel Rail Mallory low pressure fuel pump (@ tank) Bosch high pressure fuel pump (@ fuel rail) Modified 240Z fuel tank w/ 3/8" feed and Custom Surge Tank Bosch Adjustable FPR Exhaust Ceramic Coated Exhaust Manifold 2.5" Custom down pipe, ceramic coated 3" Mandrel bent exhaust Summit stainless steel muffler Cooling Griffen 24x19 Aluminum Radiator Perma-Cool 16" electric fan Custom thermostatic fan controls Suspension Arizona Z-Car Sport Springs 180/200 Boge Turbo Struts All polyurethane bushings Drivetrain 5 speed transmission RPS Max-Series 2400 lb clutch 3.7 R200 Differential; Viscous LSD planned Planned: 300ZX CV halfshafts Brakes Planned: 300ZX vented rotors & Toyota 4x4 calipers (front) Planned: MSA rear disk brake kit Electrical 300ZX Turbo 70 amp Alternator Interior Autometer Boost & Air/Fuel Fully functioning R12 Air Conditioning New seat upholstery and seat foam New carpet OEM gauge cluster OEM Clock converted to Quartz movement More pics in my gallery: http://hybridz.org/nuke/modules.php?op=modload&name=coppermine&file=thumbnails&album=89 Sean 73 240Z Turbo Quote Link to comment Share on other sites More sharing options...
cygnusx1 Posted September 23, 2004 Share Posted September 23, 2004 Awesome work! Keep us up to date on the thrills you get. Quote Link to comment Share on other sites More sharing options...
Cody 82 ZXT Posted September 23, 2004 Share Posted September 23, 2004 Looks like that should make a fun, fast turbo car. I'll be curious to see what you boost limit will be with the flat tops and the stock injectors. Quote Link to comment Share on other sites More sharing options...
Guest ss2bp1 Posted September 23, 2004 Share Posted September 23, 2004 I thought non turbo pistons, ie flat-tops, had less metal between the top of the piston and the top of the first ring making them more easily damaged with detonation. Was looking at doing the same thing so I am very curious how your setup hold up. Greg '77 280Z Quote Link to comment Share on other sites More sharing options...
Sean73 Posted September 24, 2004 Author Share Posted September 24, 2004 I thought non turbo pistons' date=' ie flat-tops, had less metal between the top of the piston and the top of the first ring making them more easily damaged with detonation. Was looking at doing the same thing so I am very curious how your setup hold up. Greg '77 280Z[/quote'] No, that's a myth, i think the P79 flattops (81-83 280ZX) are fine for turbo duty. I don't see any major physical differences between these and turbo pistons, except for the dish, of course. The early 280Z NA pistons with dish are the weak ones. Quote Link to comment Share on other sites More sharing options...
Drax240z Posted September 24, 2004 Share Posted September 24, 2004 Umm, last time I had both side to side like that there was a noticeable difference in the thickness of the piston below the first ring... the turbo one had an extra mm of depth there. I think either the picture isn't showing it right, or you have 2 NA dished pistons there. (or 2 turbo pistons) Quote Link to comment Share on other sites More sharing options...
Sean73 Posted September 24, 2004 Author Share Posted September 24, 2004 Umm, last time I had both side to side like that there was a noticeable difference in the thickness of the piston below the first ring... the turbo one had an extra mm of depth there. I think either the picture isn't showing it right, or you have 2 NA dished pistons there. (or 2 turbo pistons) Well I took the picture myself, and it is definitely comparing an 81-83 NA piston and a 81-83 Turbo piston. I removed these myself from the junkyard. I wish I would have shown the piston tops. If you look closely, indeed, the pistons are slightly different. You can see that the turbo piston has a stouter pin, and the pin height is lower for the turbo piston. (look how the skirts don't line up). This is because the P79 flattop piston has a little bit of deck height. A dished 280Z NA piston would clearly show thicker rings, and thinner ring lands when compared to these two pistons. Anyone have a picture? So, yes, the pistons are different. But I don't see why one piston would be physically stronger than the other if subjected to the same amount of abuse. The rings are the same size, and the ring lands are the same size. The deck height of the P79 piston may cause some extra heat, but I'm not losing sleep over it. I've run 10 psi in 105 degree heat, w/ no detonation on 91 Octane. I have to be a little more cautious with boost compared to a 7.4:1 CR motor, but I think my boost limitations are governed by the ECCS & fuel injectors, and not the CR. Sean 73 240Z Turbo Quote Link to comment Share on other sites More sharing options...
Drax240z Posted September 24, 2004 Share Posted September 24, 2004 Ah, somehow I missed the fact we were comparing a flattop to a turbo piston, and not a dished piston to a turbo piston. The NA dished piston and turbo piston DO have different thicknessess in the upper ring land. Obviously the flattop NA and turbo don't differ so much. Quote Link to comment Share on other sites More sharing options...
z-ya Posted September 24, 2004 Share Posted September 24, 2004 Nice work! Also, nice job on the piston comparisons. What distributor are you using, the 83' turbo unit? Pete Quote Link to comment Share on other sites More sharing options...
Sean73 Posted September 24, 2004 Author Share Posted September 24, 2004 What distributor are you using, the 83' turbo unit? Yeah. I run 19-21 degrees timing at idle, and the factory timing curve from the 84T ECCS. Quote Link to comment Share on other sites More sharing options...
wigenOut-S30 Posted September 24, 2004 Share Posted September 24, 2004 That is looking great.. Any track days planned or dyno days? I would be interested to see what this thing would put out.. NICE!! Quote Link to comment Share on other sites More sharing options...
Guest bastaad525 Posted September 24, 2004 Share Posted September 24, 2004 Sean you stole my dream car outta my head.... give it back! Quote Link to comment Share on other sites More sharing options...
RB26powered74zcar Posted September 24, 2004 Share Posted September 24, 2004 Sean, did you ever open up my PM I sent you? joel Quote Link to comment Share on other sites More sharing options...
slownrusty Posted September 25, 2004 Share Posted September 25, 2004 Wow..what a great set-up, very well put together...congrats. Yasin Quote Link to comment Share on other sites More sharing options...
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