I just purchased a 240SX off of craigslist about a week ago and now I want to get some good power out of it. I heard the SR20 is the way to go. Since it comes turbocharged already it is a great start to get some power out of my newly bought 240. Could I get some more info on this. I'm new to the forum since obviously I just bought the 240. For a while I was into Mazda3's but after doing everything I could to it I really felt like I wasn't getting as much power as I wanted. I've always liked 240's and I heard that they are pretty easy to fix up and the parts for them are a dime a dozen, plus they are super light, not to mention they are rear wheel drive. But anyways, I just really want to get pointed in the right direction before I begin seriously putting money into this cherry of a car. :twocents:
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fufanu180
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I just purchased a 240SX off of craigslist about a week ago and now I want to get some good power out of it. I heard the SR20 is the way to go. Since it comes turbocharged already it is a great start to get some power out of my newly bought 240. Could I get some more info on this. I'm new to the forum since obviously I just bought the 240. For a while I was into Mazda3's but after doing everything I could to it I really felt like I wasn't getting as much power as I wanted. I've always liked 240's and I heard that they are pretty easy to fix up and the parts for them are a dime a dozen, plus they are super light, not to mention they are rear wheel drive. But anyways, I just really want to get pointed in the right direction before I begin seriously putting money into this cherry of a car. :twocents:
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Welcome, you. Check out the Beginner Forum, which is where I'm going to move this to. There you will find a massive amount of information on all engines and whatnot. If you want to compare KAs to SRs, use the search function on the top right, under where it shows your name, last visit, etc. It's one of the tabs.
Hope you find what you're looking for.
Hope you find what you're looking for.
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keep the ka, rebuild it, turbo, done
sr's are nice for the higher redline, especially when drifting
but ka's have more torque, and the steel block is much more stout than the sr
people go round an round about which motor is better. but my ka is already running, i dont have to wire up anything, and wheh i go turbo, if i get rolled by the cops, i wont have to swap motors to make everything legit in the smog ref's eyes.
like blkrimss13 says, I <3 MY KA
sr's are nice for the higher redline, especially when drifting
but ka's have more torque, and the steel block is much more stout than the sr
people go round an round about which motor is better. but my ka is already running, i dont have to wire up anything, and wheh i go turbo, if i get rolled by the cops, i wont have to swap motors to make everything legit in the smog ref's eyes.
like blkrimss13 says, I <3 MY KA
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FYI, the redline of an SR20DET is 7,500rpm. The redline of a KA24DE (some, not all of them) is 7,000rpm. I rev my stock SOHC to 7,200 rpm for the 1st - 2nd shift.
The SR20 can rev 500rpms higher (300rpms higher in my case) than a stock KA24DE, not enough to make a significant impact.
The SR20 can rev 500rpms higher (300rpms higher in my case) than a stock KA24DE, not enough to make a significant impact.
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Why? Peak power in the stock ka24de is around 5500 rpm. After that you lose power and your torque drops way down. By the time you get to 7000 rpm you are at about 100hp and less than 90 ftlbs of torque.
You will go faster is you keep it in the powerband (4000 - 5500 rpm).
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Yeah. It's still being figured out. It happens to me as well.
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Heres an example of the gear ratio and shift points:
If I shift at 7,200rpm I have an est 50ft.lbs of engine torque. Multiply that by 3.321 x 4.08 (final drive) = 677 ft.lbs Axle Torque, and am doing 39 MPH
After the shift I'm at 4,100 rpm (39 MPH assuming a 205/60/15 tire) and putting down roughly 155 ft.lbs of torque (according to EAPro *results WILL vary)
So take 155 x 1.902 (second gear) x 4.08 = 1202 ft.lbs of axle torque.
If I would have shifted at 5,500 rpm in first gear (30 MPH) I would drop down to 3,200 rpm after the shift which would be about 139 ft.lbs of engine torque.
139 x 1.902 x 4.08 = 1078 ft.lbs of axle torque compared to 1202 on the 7,200 rpm shift
The end results = 124 ft.lbs axle torque difference (not much, but it all adds up) a 9 MPH advantage before the first shift, and the engine stays in its power band instead of having to climb back up to its peak.
And just for reference, my KA24E that revs to 7,200 is NOT a bone stock engine built by Nissan. I personally built the engine to MY specs using stock OE parts. Running a bone stock KA this high will result in failure.
Sorry If I confused the hell out of anyone.
If I shift at 7,200rpm I have an est 50ft.lbs of engine torque. Multiply that by 3.321 x 4.08 (final drive) = 677 ft.lbs Axle Torque, and am doing 39 MPH
After the shift I'm at 4,100 rpm (39 MPH assuming a 205/60/15 tire) and putting down roughly 155 ft.lbs of torque (according to EAPro *results WILL vary)
So take 155 x 1.902 (second gear) x 4.08 = 1202 ft.lbs of axle torque.
If I would have shifted at 5,500 rpm in first gear (30 MPH) I would drop down to 3,200 rpm after the shift which would be about 139 ft.lbs of engine torque.
139 x 1.902 x 4.08 = 1078 ft.lbs of axle torque compared to 1202 on the 7,200 rpm shift
The end results = 124 ft.lbs axle torque difference (not much, but it all adds up) a 9 MPH advantage before the first shift, and the engine stays in its power band instead of having to climb back up to its peak.
And just for reference, my KA24E that revs to 7,200 is NOT a bone stock engine built by Nissan. I personally built the engine to MY specs using stock OE parts. Running a bone stock KA this high will result in failure.
Sorry If I confused the hell out of anyone.
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yeah, kae's breath more up top. but its been dyno proven that a kade will not make power past 6k. where as i have seen sr's with mild head work rev up to 7500 & still make power. ive seen a dyno sheet of a built sr that made power to somewhere in the mid 8k range. the highest revving built ka ive seen make power was on a youtube vid & it only revved to 7600rpm. thats what i was getting at when i said sr's rev higher. but we both agree, that ka>sr anyday 
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also, ka's are great for turbo. the de's have oil squirters, the block is stout & can take the added temps of a snail, the crank is good to somewhere in the hi 300hp range, they make a ton of turbo oriented piston sets & cams, you just cant beat it.
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the e's might have oil squirters, i never got a chance to dig into my sohc so i dont know for sure
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