intake manifold

[warrenbeze]

will the intake manifold from a 89 240sx fit a 95 hardbody with ka24e

[03frontyka24]

It should, as long as they are both SOHC, but I have to ask why, the hardbody manifold is torquier, the 240 manifold is for higher RPM's.

[warrenbeze]

well i'm trying to figure out ways to get more hp im thinking that with the different intake you can get a CAI and get back some the lost tq and gain more hp a higher RPMs

[03frontyka24]

well i'm trying to figure out ways to get more hp im thinking that with the different intake you can get a CAI and get back some the lost tq and gain more hp a higher RPMs

It is a common hardbody mod, it does give more horses but lowers your torque slightly, you need an air filter change as well.

What rear end gearing do you have? I have 3.90 on my frontier, I wish I had 4.11

[warrenbeze]

I was thinking of the AEM cold air intake to finsh up the install. not too sure of the rear end I was thinking of changing it to a Pathfinder rear end with LSD and rear disk but I know that would not be any good for hwy because it has a 3.88.

[03frontyka24]

I was thinking of the AEM cold air intake to finsh up the install. not too sure of the rear end I was thinking of changing it to a Pathfinder rear end with LSD and rear disk but I know that would not be any good for hwy because it has a 3.88.

3.88 is great for highway, it just isn't good for hard launches or rock crawling. As you move your powerband up you want to go to a lower gear like a 4.11 or higher to take advantage of the horsepower at higher RPM's.

I think the nissan gear selection for the 5 speed could use a little fine tuning as well, I can get to 60mph in second without red-lining.

[Dattebayo]

You are confusing us here, i think. I just bought a J30 vlsd, and it has a ratio of 3.9 something. The 240's stock differential is 4.0 something (same for open and vlsd).When you make that gear ratio a smaller number you are supposed to get greater high end speed. In my situation, 4% difference. So when the stock diff would have me going 100 mph, the same power would bring me to 104mph with a little less accelleration.

So the way it goes, if you want to take advantage of high end power, you want a LOWER number ratio in your differential. You will convert that power to more speed. If you want a quick punch street racer with fast accelleration and no top end, get a HIGHER number ratio. Just clarifying here.

[warrenbeze]

Yeah I had it backwards :alcoholic .....

[03frontyka24]

[quote=" 2BN_S13 If you want a quick punch street racer with fast accelleration and no top end, get a HIGHER number ratio. Just clarifying here. [/quote]

Just remember, HIGHER number gear ratios are called LOWER gears.

[95hardbody]

You can also describe the gears as "short" and "tall", which loosely corresponds to top speed capabilities, and makes the most sense to me. For example, I had an '84 Cutlass that had 2.14:1 rear gears (no joke). Those were very *tall* gears (and top speed capability, if the engine would actually pull it, was somewhere over 200 mph). My '95 Hardbody truck, by comparison, has very *short* gears (4.375:1). My Cutlass had a V-8 engine which had the torque to move a 3800 lb car with 2.14 gears, and they went that *tall* for fuel economy. My truck doesn't have near the torque of a V-8 engine, and the gears are much *shorter* to compensate for it.

Putting it in terms of 240s, if you replace your 3.9 hears with 4.6 gears or something similar, you have more torque multiplication (4.6x vs 3.9x), so you are getting more power to the ground. You could take it to an extreme and put in 8:1 gears, and have HUGE amounts of power to the ground. But at the same time, you'd be shifting all the time and you'd have a redline-limited top speed of like 40 mph or something. The engine has the power and torque for good performance with the 3.9:1 gears, so that's what Nissan put in there. Go *taller* than that (with a 3.3 gear or something), and you may gain more top speed, but you'd lose acceleration. Go *shorter* than that (with a 4.6 gear), and you'll loose some top speed, but you'll gain some acceleration.