jkelly Posted December 6, 2017 Share Posted December 6, 2017 (edited) Hey guys, I"ve been reading around here a bit and have a few questions on what route you think I should go. I have a build thread over in the members rides section too. What I want: A streetable/daily driveable turbo car that's also fun on the track and has room for growth. 300 - 350 horsepower to start with. Budget: Budget isn't a huge concern, but it's not unlimited. Block/Head options I have: Completely rebuilt L28 NA from a 1978 280z 2+2: Rebuilt N47 head with NA Schneider .460 260/260 cam, 300zx springs Rebuilt N42 block with 0.020" overbored flat tops Non-running L24 from a 1972 240z: E88 stock head P30 stock block Non-running L28 from a 1975 280z: N42 stock head N42 stock block Maxima stock MN47 head Intake/exhaust options: Non-egr shaved N42 intake manifold with 60mm TB Turbo (?? something like a Garrett T3/T04E Stage III Turbo 50 Trim 0.63AR??) BOV (??) Wastegate (??) Intercooler (??) L28ET stock exhaust manifold Fuel/ignition management: Megasquirt 3 with MS3x board COP using LS coils Full sequential ignition Fuel delivery: Stock 240z tank Walbro 255 Carter low pressure lift pump 1 liter surge tank 5/16" fuel feed line (big enough?) 5/16" fuel return line 440cc or 550cc high impedance injectors Do you guys have any advice on what head/block combination I should use from above? Should I start looking for a P90 head? Should I swap the NA Schneider cam for a turbo cam? With the N47/N42 and a 2mm head gasket I'm still looking at almost 9:1 CR. With a P90 and the N42 block with flat tops I'm looking at about 8.5:1 with a stock gasket and less prone to detonation using the higher quench head. Any other general advice or suggestions? Once I get this figured out I'm going to start sizing my turbo. Edited December 6, 2017 by jkelly Quote Link to comment Share on other sites More sharing options...
jkelly Posted December 11, 2017 Author Share Posted December 11, 2017 Well I ended up buying a P90 head from someone, so I'm thinking I'll put the P90 on the N42 block with flat tops and use a Nissan head gasket for about 8.5:1 CR. Quote Link to comment Share on other sites More sharing options...
madkaw Posted December 11, 2017 Share Posted December 11, 2017 Looks pretty ! sounds like a good combo Quote Link to comment Share on other sites More sharing options...
softopz Posted December 11, 2017 Share Posted December 11, 2017 IF you plan on even reaching that 300 hp let alone 500 go dished and save yourself the 2nd rebuild. Matter fact go forged at 300-500 its pushing it and you want to beat on it for awhile reliably. 300-500 is pretty max for the L series I am making about 400 to the wheel thats with a stroker and gt35r/ Quote Link to comment Share on other sites More sharing options...
jkelly Posted December 13, 2017 Author Share Posted December 13, 2017 (edited) Thanks for the replies guys. On 12/11/2017 at 3:37 PM, softopz said: IF you plan on even reaching that 300 hp let alone 500 go dished and save yourself the 2nd rebuild. Matter fact go forged at 300-500 its pushing it and you want to beat on it for awhile reliably. 300-500 is pretty max for the L series I am making about 400 to the wheel thats with a stroker and gt35r/ I get what you're saying. I would hate to destroy some nice forged pistons while learning how to tune the setup, though. I've heard of people doing this and other people recommending learning to tune on cheaper cast pistons then upgrade to forged. Don't some people run up to 300 - 350 whp on cast flat tops + P90 and pump gas if detonation is under control? Maybe not. I'm certainly still learning. I think TonyD ran (runs?) a boosted L28 with flat tops and N42 at 8.5:1 CR. I'm not sure what kind of power he's making. Edited December 13, 2017 by jkelly Quote Link to comment Share on other sites More sharing options...
HuD 91gt Posted December 13, 2017 Share Posted December 13, 2017 (edited) I am using a similar setup with a P90/Flat tops. One of these days i'll toss the turbo charger on it. I had similar plans to you. Goal of 350rwhp. If I had known the total cost my rebuild would cost me, I would have tossed forged bits in with it. I've been tinkering with my FI while running the engine NA and i'm sure I would be missing a ring land or two if I was turbo charged. Once I bolt it all together I will tune properly on a dyno. For me, the cost of some forged bits is cheaper then the time and hassle of pulling the engine apart and putting in new pistons every "oops". You may get a few "oops" with the forged. Edited December 13, 2017 by HuD 91gt Quote Link to comment Share on other sites More sharing options...
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