halokilller Posted September 25, 2013 Share Posted September 25, 2013 I am running a 83 zxt l28et with a big front mount intercooler, 12 psi boost, msd fuel pump, cold air intake, 3" exhaust, stock downpipe, 280zx n/a trans, r200 lsd with aftermarket half-shafts, all running on a z31 300zx ecu The car runs great and is plenty fast but I was wondering what the best option would be to get to the 400hp level. I was thinking of getting bigger injectors, bigger turbo and msa downpipe and pushing my luck on the n/a trans Would the 300zx ecu be sufficient for this power level or will I absolutely have to upgrade to a standalone ecu like megasquirt? Am I missing anything? I am new to the L6 platform and would appreciate any help, thanks! Quote Link to comment Share on other sites More sharing options...
winstonusmc Posted September 25, 2013 Share Posted September 25, 2013 The Z31 300z MAF might not be able to meter that much air. I know the only MAF that can handle that is the Z32 300z MAF. You could go standalone ECU and go a speed density system and eliminate the MAF. The clutch will have to be upgraded as well. Quote Link to comment Share on other sites More sharing options...
ctc Posted September 25, 2013 Share Posted September 25, 2013 (edited) Ecu, cam and head work would be where I go next. Also read up on the #5 cooling thread. For those power levels you are going to need some additional cooling to make it live. Edited September 25, 2013 by ctc Quote Link to comment Share on other sites More sharing options...
Tony D Posted September 25, 2013 Share Posted September 25, 2013 JWT 450 Kit had that name for a reason... Quote Link to comment Share on other sites More sharing options...
Xnke Posted September 25, 2013 Share Posted September 25, 2013 There are multiple mass air meters that will handle that kind of power, and multiple ways to make it work. My advice? Get Nistune setup on a 300ZXT ECU and tune what you have, then move to a Z32 or a Q45 MAF IF you need it. 300HP in a Z or ZX is a LOT of fun, and a lot of power for a street car. 400HP and you'll have a lot more problems than just the transmission...which will NOT handle 400HP and driven semi-hard, and it'll be beaten down pretty quick at 300HP unless you're a very smooth driver. Get ready for a Z32 transmission swap if you're not slick as snot shifting, or intend to do any kind of drag racing or rough treatment of the transmission. Quote Link to comment Share on other sites More sharing options...
Tony D Posted September 25, 2013 Share Posted September 25, 2013 Call me Mr. Smooth, I guess! Quote Link to comment Share on other sites More sharing options...
JPN_Garage Posted September 25, 2013 Share Posted September 25, 2013 400+cc injectors would help, you already have what you need for the high 300's I also have an L28et in my 240Z but I have the Turbo BW tranny and the JWT Z31 ecu for 420cc injectors I hope to be in the high 300's soon Quote Link to comment Share on other sites More sharing options...
DuoWing Posted September 27, 2013 Share Posted September 27, 2013 If you're not afraid of some tuning/wiring, etc I'd say go aftermarket. I'm one who has Nistune and really like it, but for the price and time in it especially if you're going to put some money into converting to the Z31 stuff, might as well take that money and go MS. Quote Link to comment Share on other sites More sharing options...
Xnke Posted September 27, 2013 Share Posted September 27, 2013 Seen too many 71B's torn up from less-than-smooth shifting behind higher power L engines, mine included. (learned to drive on this 345,000 mile S12 trans...there were some PIO moments that were really rough!) Mostly the up-and-down shifting with less than great revmatches starts to loosen up the mainshaft nut, and the clack-clack on shifts gets pretty loud. It doesn't take long from that point... Quote Link to comment Share on other sites More sharing options...
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