Need More Power

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Sep 27, 2003 | 01:50 PM

SHADY280

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Need More Power

I NEED MORE, LITTLE BOUT ME ENGINE FIRST. N47 BLOCK, P79 HEAD DECKED .080, PORT AND POLISH. PISTON RELEIFS CUT, FLAT TOP PISTONS, .030 OVERBORE, .020 ABOVE DECK, 11.0-1 COMP ON 94 OCTANE PUMP GAS, .470" LIFT CAM 111 DEG LOBE SEP. AND PERF. VALVE SPRINGS. HEADERS AND EXH.

NOW WHAT ABOUT THE FUEL SYS. I WANT FI ON MY 79 ZX, HAVE AN 82 COMPUTER AND HARNESS SITTING, IS IT ANY BETTER, MY 79 DOESN'T EVEN HAVE AND O2 SENSOR SYS. WANT A TURBO FUEL PUMP, BUT WHAT INJECTORS, 240 SX, 280ZX TURBO?? NEED A LITTLE HELP ON THIS IF YA WOULDN'T MIND

Oct 4, 2003 | 03:25 AM

280zx Fever

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Well all ZX's are Fuel Injection.

But the injection will bolt straight on. Fuel pump in the tank

Oct 4, 2003 | 11:53 AM

SHADY280

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I KNOW I HAVE FUEL INJ. BUT WHICH COMP IS BEST. FUEL PUMP IS OUTSIDE TANK PASS. SIDE, THANKS THOUGH, THINK WE NEED MORE HELP.

Oct 6, 2003 | 03:16 PM

Bleach

The Evil Twin

Joined: Mar 2001

Posts: 9,296

From: Seattle, WA

I don't think the computers made any difference at all. The addition of an oxygen sensor did change the computer but not the horsepower. The main difference in a simple swap was about 10hp and +10 lbs of torque. The 1975-80 blocks have the dished pistons and the 1981-83 blocks/head combos have flat top pistons with only slightly higher compression. You could shave your head to get the higher compression though. Put in a new timing chain and advance it to the #2 position to take up the slack.

Oct 7, 2003 | 08:32 AM

280zx Fever

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BleachZee -- The 280z was higher in compression then any 280zx they had the flat tops and the 280zx dished... 8.8:1 on the 280z and 8.3:1 on the 280zx.

Oct 7, 2003 | 10:50 AM

Bleach

The Evil Twin

Joined: Mar 2001

Posts: 9,296

From: Seattle, WA

In the USA, it is in fact the opposite of what you stated. The 280Z and 280ZX from 1975-1980 used the same block with dished pistons. The 1981-83 changed to the F54 block (design used for the turbo engine too) and the n/a got flat tops with 8.8:1 compression. The turbo F54 block used turbo dished pistons, also from 1981 on as we all know that was the first year of the turbo.

The net vs. gross horsepower rating on the 280Z of 170hp and 280ZX of 135 or 145hp is not the proving factor.

The earlier blocks produced 135 wheel horsepower or 170 crank horsepower while the later produced about 145 wheel horsepower or 182 crank horsepower.

Oct 8, 2003 | 09:07 PM

SHADY280

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THANKS FOR THE HELP WITH THE COMPUTER, BUT STILL NEED HELP WITH THE INJECTORS. THE HEAD/COMP. RATIO THING I GOT FIGURED OUT, IF YA READ THETOP A LITTLE MORE CAFEFULLY

Oct 9, 2003 | 07:02 AM

280zx Fever

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well there you go

i know for a fact in Aus the 280z short block has the 8.8:1 pistons and the 280zx has 8.3:1 but the figures are not all that differt

Oct 9, 2003 | 07:15 AM

Bleach

The Evil Twin

Joined: Mar 2001

Posts: 9,296

From: Seattle, WA

If you really want a better system, go custom. Build a megasquirt fuel injection computer. Not only will that give you a tunable system, but that frees up the intake by using a vaccume sensor and no air flow meter!

http://www.bgsoflex.com/megasquirt.html
http://autos.groups.yahoo.com/group/megasquirt/

Oct 10, 2003 | 08:13 AM

#10

280zx Fever

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Megasquirt is great. though if you have no electical experiance i wouldnt recommend it as your most likely to burn up a transistor or something

Oct 10, 2003 | 09:13 PM

#11

SHADY280

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WHAT IS MEGASQUIRT AND HOW CAN I GET OR BUILD IT, CUSTOM INTAKE IS NO PROB, SO SIGN ME UP!

Oct 12, 2003 | 11:29 PM

#12

280zx Fever

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you order the system off the website. it comes in kit form PCB and all the resistors and transistors to make the controller up but as i said if you have no electical experiance i wouldnt even think about it.