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help! with my stock 280z


anthony280z

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The primary concern is whether your head has round or square exhaust ports. Other than that, most any header designed for the 240, 260, 280 will fit. If you have a later head from a 280zx it will have round exhaust ports. If you tell us the head number(E88, N42, N47, P79, P90) we can tell you what shape your exhaust ports are.

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Headers by themselves will not give you any noticable increase in power.

Better to look in other areas first such as polish & porting the head, new cam etc, once you have done these then think about headers for that 1% increase that they give you.

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Headers and an exhaust will not give you a "noticeable" increase in power. It's all psychological. They will give you some increase. I am of the school that the stock exhaust header is fine. There is no reason to upgrade to a header until you are producing more power. You can pick up a 2.5" exhaust from MSA for around $180.

The only way these cars make noticeably more power is if you increase the compression, increase the bore, switch to flat top pistons, change the cam, etc. You can not simply bolt on significant horsepower gains.

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  • 3 weeks later...

Any one that says you cant bolt on noticeable horse power has not played with the idea to much.Ihave a stock 280zx. stock it runs 10.44. I bolted on an cold air int., a 60,000 volt super coil, alum. fly wheel,stage3 act clutch, cut the shifter down, and made my own fuel cell, added electric fans,taylor spiral pro-race wires, and now it runs 9.58 consistant. 10.44-9.58 not significant? YOU JUST HAVE TO KNOW WHERE TO PUT THE MONEY!!!!!

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You did say a STOCK 280zx, right? Then your times must be for an 1/8th. You are not talking to high school girls here. A 60,000 volt coil does not do anything; an ACT clutch does not add power, it only helps transmit power to the ground; a CAI does not do anything for these cars; a fuel cell, electric fan, and Taylor wires do not add power to the car.

Trust me, you can not bolt on significant horsepower (excluding nitrous, turbos and superchargers). Exhaust, headers, and intakes do not add significant horsepower by themselves.

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ooIm not trying to make any one look like school girls. IST i did not say the act made power, I said it helps get you out in front! AS far as the fan goes it takes a little bit of drag off of the motor. Every thing i metioned i did one thing at a time, so i would know what worked and what did not. AS far as the fuel cell goes you are right, it does not add power. But it takes weight out of the car, which every body knows, the lighter the car is the quicker it will be. And yes you are right it is 1/8 et. Any body w/common sense would know thats not 1/4 et,s!! With these mods i AM almost untouchable. Im not goin to lie to make my self look good in here. Its STUPID. Yes I get my arse handed to me on a plate every once in a while. But thats all part of it. The bottom line is you have to figure out what works 4 you no matter if you are racing it or driving it every day. Besides I have video to prove that you CAN bolt on significant power! Maybe you would like to see it! Im not trying to start any thing, I just gave my opinion. I dont want you to think im mad or any thing cause im not. Some times when I cant figure something out this is where i come to for help. So enuff said. I am looking forward to your reply. Im out. peace.

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I am not trying to start anything, but simply clarify your statements. The problem is that whatever we talk about here, on the boards, is available for search. If someone makes an outrageous (and false) claim (not saying that you did) and no one counters it, then others may think that information is true and try it for themselves.

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Well maybe i jumped the gun at your staement, but I did not make any false statements about the stuff that i have mentioned in my previous posts. I have tried it and proved it to be true. I spent whole summer making adjustments each week then going to the track to see what made me faster & lighter. Everthing that i have changed on my Z has made an imporvement as far lightning the car and/or adding horsepower. Your right everything on here is available for research (which everyone SHOULD do). Adding horsepower isn't the ONLY thing that is going to make your car quick. Making the car lighter, knowing how to drive the car, and knowing what the car is capable of are all very important. You can add all the bolt on's you want but if you don't know how to drive the car, they are really not going to make a difference. In short, I guess everyone has to figure out what's right for them and their car, this is what was right for mine. oh yeah by the way, dont use a turbo clutch, on a non-turbo car, it really sucks.

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The only exception to the "easy bolt on horsepower" is the late 280Z. The 78 has a very restricted two into one pipe. They are so short and tight, the tubing is rectangular. Replacement with a header will free up the bottle neck. Pace Setter or MSA will work. MSA had the thicker flange (better mount), the last time I checked. The 78 280 should have the N47 round port head. I say should, because my 78 had a rebuilt Lazorlite installed with the N42 head and I have additional restriction with a round port manifold on the square port head. Look at the side of the head for the N47 marking. If so, then you need the later round port header. You might want to check ebay.

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Hey, Ive got a question. I have the n 47 head. My question is if you do port work on this head, can you take the heat shields out? Also does it make any difference? This head is an 80 man. date as far as i know. If i can take these out, is there any damage risk?

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Before you try to "bolt on" horsepower, you need to make sure the car is working its best with the parts you have. Make sure the air/fuel mix is right, the spark plugs are good & timing is at its best, your trans isn't slipping, and all the rest of the stuff. If the clutch was old & slipping, a new one may have been in order but changing the cluch to a 'performance' unit may have been just wasting money, as just a new tock unit could have done the same.

An entire engine rebuild, on a car that could be up to almost 40 years old, may even be in order...

Replacing the stock fan didn't necessarily need to be done, as the fan shouldn't be totally engaged if the engine is cold. That bit was a 'luxury.'

Saving weight is only good as long as you save a LOT of weight; the rule of thumb is that for every 100 Lbs. of weight removed will save you 1/10 second in the 1/4.

Putting go-fast parts on a poor engine or car just makes it a more expensive slug.

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Taking the heat shields out leaves a big, irregular opening, worse flow. If you check the many threads on this topic, here and at Hybrid Z, you will note that the N47 flows very well in stock form. Just clean up the valve bowls or pockets.

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Putting go-fast parts on a poor engine or car just makes it a more expensive slug.

Not to mention that it will also shorten what's left of it's life. I've been trying to impress that on my son for a couple of years now. Wait a minute, did TomoHawk and I just agree on something?:classic:

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