I have a '95 Hardbody with KA24E and automatic...what controls the power surge at 3200 rpm? Can't find any reference to it in the Chilton Book...
Nissan intentionally dialed in torque peak at around 3600 rpm. It was done with varied intake manifold runner lengths and camshaft profiles. Car models get a different setup.
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Aaron Ford
95 2WD Nissan PU E
2002 Oldsmobile Intrigue GX
"The hard part about playing chicken is knowing when to flinch" Scott Glenn in The Hunt for Red October
I have a '95 Hardbody with KA24E and automatic...what controls the power surge at 3200 rpm? Can't find any reference to it in the Chilton Book...
There is a butterfly valve in the intake manifold that is closed at slower speeds to promote turbulence and low-rpm torque. This opens at higher speeds to achieve a long intake runner, and maximum volume of intake air.
You know I have the same thing on my p/u but I have a ’93 2wd ka24e w/ auto.
Im truthfully wanting to make a street truck, I don’t do much hauling, and no towing but a lot of driving what would be the pros and cons of swapping the inkake and all over to the same as came in the 240? What would be the cost? What type of power increase?
I’ve thought about switching all over to the same stuff that came with the 240 but I don’t know what differences there are, let alone if it’s a good idea, but what would be better for dragging?
I’ve thought about switching all over to the same stuff that came with the 240 but I don’t know what differences there are, let alone if it’s a good idea, but what would be better for dragging?
For a pure drag race perspective, you might see some gains (maybe 5hp). But you'll lose torque, because the 240sx engines were tuned differently than truck engines. They put truck engines into trucks for a reason. You'll probably have more sluggish performance if that's all you did. But if you're making it a drag truck anyway, you might see an ultimate performance benefit from the 240sx's intake. But if you were making it a drag truck, you probably wouldn't use the KA24E anyway.
For a pure drag race perspective, you might see some gains (maybe 5hp). But you'll lose torque, because the 240sx engines were tuned differently than truck engines. They put truck engines into trucks for a reason. You'll probably have more sluggish performance if that's all you did. But if you're making it a drag truck anyway, you might see an ultimate performance benefit from the 240sx's intake. But if you were making it a drag truck, you probably wouldn't use the KA24E anyway.
yeah im not going professional drag its still going to be my daily driver and im planning 2.0-2.25" catback but if im better off in the 3-5k rpm range with my manifold and all then thats what ill keep
yeah im not going professional drag its still going to be my daily driver and im planning 2.0-2.25" catback but if im better off in the 3-5k rpm range with my manifold and all then thats what ill keep
I think you'd be best off leaving it alone. Put an open element air filter (plumbed to outside air) to see the most benefit from your exhaust system and go have fun with it. I agree -- I wouldn't go any bigger than 2.25" on a 4-cylinder engine. Many larger engines don't have exhaust pipes larger than that. Remember, there's more to performance than total volume potential. Larger pipes tend to cool exhaust off faster and let the exhaust gas expand, which loses energy. This is why putting 4" exhaust pipes on 4-cylinder engines tend to slow you down.
With the 2.25" and filter kit, you'll probably see an honest 10 hp at the wheels. Bump the timing up a few degrees for another noticeable difference and you'll swear you have a V6 in it.
ok sounds like a plan, but where can i find a filter kit for my truck? or do i have to fab one up?
Not sure...never looked into them. I understand Jim Wolf Technology does some Nissan stuff. Anything for a KA24DE Frontier should fit well on a Hardbody, because I understand that the air cleaner system is the same. I wouldn't install one that simply places a cone under the hood...unless it's REALLY buried down behind and below the headlight area. The last thing you want is for the engine to be pulling hot underhood air. Also, check 4x4parts.com, I bet they have something.
actually thats what my engine is doing now i took off the top of the stock airbox and left the filter on and put the 2 wingnuts back on to hold the filter down
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KA24E Power Surge
You'll probably have more sluggish performance if that's all you did. But if you're making it a drag truck anyway, you might see an ultimate performance benefit from the 240sx's intake. But if you were making it a drag truck, you probably wouldn't use the KA24E anyway. 
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