DAT240Z Posted December 5, 2003 Share Posted December 5, 2003 Hi Guys The time has come for my turbo project, I have a 240zt that I drove over the summer and loved (even better that my 350z). Well, just before the end of summer the crankshaft pulley fell off and the slot in the crank for the keyway got chipped a bit and now the keyway will not stay in he crank. I parked the car and decided to work on it during my 2 weeks Christmas break, well the come is nearing. I have always wanted to do a flat top piston turbo looks like this would be a great time to do it. I have a F54 82 N/A block what I'm thinking of doing is pull my Turbo head and swap it to the N/A block with the oil pan,dissy,turbo clutch, and run a stock head gasket with according the lengine program would be 8:5:1 compression. I will also be running a supra intercooler and the stock turbo EFI system I would like to still run 12-14 psi of boost like I did with the turbo block. So I would like to hear from people that have or are running flat top piston on the pros & cons. Anyone with any info on the subject please respond Thanks Quote Link to comment Share on other sites More sharing options...
yo2001 Posted December 5, 2003 Share Posted December 5, 2003 I run L26 flattop with P79 head. (8.x:1 compression) first I ran N/A ECU with BTU and no FMU ( ) on a stock turbo until it blew a headgasket @12psi due to a lean A/F. After that, I ran FMU for awhile with same setup ran fine. (I did belw another head gasket due to a warped head) then I got me a HKS 2mm drop the compression to 7.8:1 and it has been together since. Now with a 60-1 and 14psi on Z31 ECU, I've no problem with it. Quote Link to comment Share on other sites More sharing options...
Clifton Posted December 6, 2003 Share Posted December 6, 2003 Long time ago I ran an L26 with N42, no intercooler, but had water injection. Your compression should still be 8.8:1. P90 and P79 have the same combustion chambers so you wouldn't be loosing compression. You could always run a 2MM HG, I would. Quote Link to comment Share on other sites More sharing options...
Lockjaw Posted December 6, 2003 Share Posted December 6, 2003 I got forged flat tops, does that count? Quote Link to comment Share on other sites More sharing options...
rags Posted December 6, 2003 Share Posted December 6, 2003 Forged flat tops on a 3 liter. 8.5-1 compression but using programmable FI. Joe Quote Link to comment Share on other sites More sharing options...
DAT240Z Posted December 6, 2003 Author Share Posted December 6, 2003 Hi Lockjaw and Rag, how do you guy like you the flat top how is the off boost and would you recommend it? Quote Link to comment Share on other sites More sharing options...
Lockjaw Posted December 6, 2003 Share Posted December 6, 2003 Yes I would recommend them I like mine. Of course mine don't come above the deck surface of the block, like a 2.8 with the factory pistons does, and I also have turbo style pistons. Quote Link to comment Share on other sites More sharing options...
rags Posted December 7, 2003 Share Posted December 7, 2003 I like mine too! 1mm down in the hole at TDC. Off boost feels stronger on the butt dyno than my friends bone stock 75. But that could be attributed to the weight difference. Quote Link to comment Share on other sites More sharing options...
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