boring/stroking a 2.4 liter block is kind of pointless, when one can pick up an L28 and do the same thing, and with rebello's kit get a 3.1L stroker making gobs of power. The only way you can tell is to pull the head off, take measurements of the bore sizes to compare with stock, and compare piston sizes/model number with stock. E88 head is also not the optimal head to use with a bore/stroke kit

As far as top speed goes, just as I told you before, the Z in stock form makes about 100 lbs of lift in the front at 80mph. At 100mph, the Z with stock aerodynamics has a drag coefficient of 0.465, or, that of a brick wall or a jeep. For reference, my daily driver neon is .29, and the lower the number, the better. The 240z in stock form makes about 115-120hp to the wheels. The 150hp rating it had was gross, not net. Gross rating means power was rated at the crank without any of the accessories attached to slow down the motor (waterpump, alternator, smog pump, restrictive exhaust, etc). In reality, it made around 135 to the crank. You would top out around 120-125 max due to lack of power and aerodynamics.

 

That's the same as what I've heard. clear up to the 280ZX the top speed has always been about 125-130 max. The 280zx has better aerodynamics and a bit more power from the fuel injection but still doesn't make a whole lot of difference for top speed.

With just the right gearing you could help peak that speed. Maybe you changed your rearend gear ratio and left the speedometer cog the same? Or the old 240Z gauges just aren't accurate. I know that the tachometer reads too high in the higher rpms... right?

 

i've already told you twice, obviously you don't listen. The Z is NOT ****ING SAFE at that speed. PERIOD. If you feel like becoming a darwin award, by all means, go out on the freeway, but at least do it at 4am so when you lose control and crash, you won't hit anyone on the road.

My suggestion? Sell the car and get a civic. You're just going to become a statistic

 

I don't see how a 2.0 DOHC 4-banger can do 140 either! That thing has the same hp and a lot less torque than your car and its much heavier. Have his speedometer checked out too. Get a 350Z. You'll be much safer in a crash.

Or maybe go out every night running your top speed for as long as you can. When you get pulled over, ask the cop how fast you were going!

 

Fastest I've ever gone in my daily driver (neon r/t, rated at 150hp) was 133 calculated, I was doing 6100rpm in 5th at the time. Past that it would not pull anymore. The car also wasn't stock, it had mopar 4-2-1 header, cold air intake, mopar ecu, and a lightened crank pulley. Using ricemath, I'd say my car was making about 165-175 at the crank. Drag coefficient of my neon is also .29

 

Hi. My 76 280 did do 140. The engine was new, only had 30,000 miles on it, but it did it smooth too, and stock. Why don't ya'll think the z can do it? Sure it can and why elce would the speedometer say it?

 

Do the rpms read accurate?

 

That's another thing. the Tach isn't as accurate at higher rpms. I think it was the 240Z tach thats the worst. Reads higher than the actual rpm. The 280Z and ZX tachs are much more accurate.

 

see my explanation above. aerodynamics, gearing, and speedometer offset say otherwise.

by the way, you never got back to me about those rims.