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Thread: S14 with SR20 or KA24

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Posts: 101-110 of 137
2008-12-07 00:49:52
#101
HP is a measure of work/time. You can create torque without any work actually being done is what ben is saying. Getting work done as fast as possible is what makes the car go fast. Therefore, HP is all that matters. If you want I can take you for a ride in a Peterbuilt truck and you can see for yourself. 1500lbft makes the rig feel fast! But look at the speedo and you realize that only 500hp makes the rig slow. The reason why the rig can do so much work is because of the HP at low RPM and torque multiplication by the 13 speed gearbox. By multiplying the "torque" it makes it easier to get the work done, but not faster.
2008-12-07 00:50:52
#102
I think people have gotten way out of hand with this thread, and its become an intillectual pissing match.

Well anyway, i agree with the old saying run watcha brung. What ever engine you have wether it be a ka,sr,rb,vq,ls1 etc can be built to do just about anything, each engine has its strong and weak points. I have personally seen and ridden in many of these set ups in a 240sx s13 or 14. Most of the drift cars around here either have a ka or an sr. One of my friends has a built ka24e-t single cam in his s14, this is by far one of the most fun drift cars i have ever been in, and it was built at a reasonable cost. Another good friend has a very competitive n/a ka24de which is super reliable and a blast to drift, auto-x, and roadrace.

In the end its all personal experience, opinion or the depth of your pockets determine which route you will chose and to what level your engine/car will be built.

Thats just my .02
2008-12-07 00:53:26
#103
Originally Posted by boostin50
And in order to do that you must make torque!!!!!!!!! do the math....... you CAN NOT have alot of hp at low RPM's with out torque PERIOD..

Torque X RPM
______________ = Horspower
5252


You learned the equation, now explain how Torque matters again? That's like saying "amperage is better than watts of power", but Watts is the actual amount of power being made. HP is power. Period. You are right, you can't have HP down low without torque. But that doesn't mean that torque is more important. I will say it again. HP is all that matters. Torque can be multiplied by the gearbox.
2008-12-07 01:53:25
#104
ok this argument with the stock vs stock is stupid. The KA comes with 9.8:1 compression, and the det comes with 8.5:1. UM DUH the KA will be faster! Look at the advantage it has, If you just toss a T25 on there. You're comparing apples and oranges. If you take a 9.5:1 SR and a 9.8:1 KA and toss a T25 on both the 1/4 mile time will be within a tenth of a second of eachother. Mod for mod these engines are equal up until big HP numbers where the 2.4L becomes more important. Plus with the 240 you can put in a Z32 trans for when you run 160+ traps. And for whoever said Ivan's KA-T has an untouched bottom end, do more reasearch, that thing is the epitome of built and also it has the Z32 auto trans.
2008-12-07 01:57:01
#105
there are many variables to asess, it really does boil down to what you want to do with the motor, the money you have to do so( cost effectiveness), the application.. ect.
in light of this discussion wouldnt the sr20 be deemed a more balanced motor?
2008-12-07 02:20:44
#106
^^No because the KA24 came in the car^^
2008-12-07 02:47:21
#107
Originally Posted by Coheed
If they are making the same power, then the gearing and driver will determine the outcome. Gearing plays a big part when getting the engine in the sweet spot and keeping it there. if you do in fact get a KA to run as fast as a built VE engine, then it won't be nearly as driveable. I have a KA here on an engine stand, I like the motor they are very stout. But you can't say that equal power on both engines the KA will be faster. It depends on more than that. The KA has a big broad powerband, but when revving high that KA will get walked on by an SR. The KA simply cannot rev high enough to make power on the top end and this is where the SR shines in comparison.

You can't take a big stroke engine: put on huge turbo, big cams etc and expect it to be as efficient as a high revving big turbo engine. Cylinder filling at high rpms is horrible on the KA in comparison. That is what it is all about: cylinder filling. There is a reason why nissan never revved their KA race engines over 8k.


Originally Posted by Coheed
Acceleration is purely HP. I can show you some all motor hondas with full interior running 11s making under 180lb ft of torque. HP and when you make it is all that matters. TQ numbers don't mean anything, they just give you an idea of twisting force, not acceleration. Diesel engines always make more torque than a gas engine, but they won't out-accelerate them because of HP. The HP curve from a dyno will show you exactly how the engine will accelerate because that's what it measures (on inertia dynos like dynojet).

Best HP curve will always win the race.


Originally Posted by Andreas
The RB20 motor is a great but I would not take it over a KA24DE.

The KA24DE can be had for $400 or less. The parts are easier to come by for the KA24DE. The parts are cheaper for the KA24DE. The KA24DE will make more horse power, more torque and do so at way less boost than the RB20 motor.

The RB20s weight is more than the KA24DE. It will cause the car to be nose heavy. It will make the car handle bad which can be fixed but the cost goes up even more. Then you got to add in the cost of fabricating the parts to put the motor in the car.

The guys here in Miami generally make 500 WHP and 500 Ft Lb Torque at 19-21 PSI. Alot of them do so on stock bottom ends with upgraded headbolts and headgasket. These cars are driven around the street on a daily.

LanceSR20s friend Andre makes 700 WHP and 680 Lb Ft Torque at 32 PSI if I remember corectly.

He has
KA24DET
Metal Headgasket
ARP Headbolts
Rods
Pistons
JWT cams
Cam gears
Turbo manifold
GT40 turbo
Tial 44mm wastgate

I will be building a rear drive 240sx at the end of 2009 and this is the way I am going.


Originally Posted by ca18
nah the ca18det is a piece of crap hahaha no torque, really had to clutch kick the crap out of it to have any fun

i had one in a striped out rwd bluebird (you might not get them over there, but its cheap boxy car)

car had s13 coilovers, locked diff, t3 turbo running 17psi, walbro, supra fmic, no interior or sound deadening, aluminum dash with gauges pluged in, 4 pt harness, weight around 800-900kgs etc

my daily actually got stolen, so for a period bout 3 months i had to drive it to work everyday. Was a very fun car, but it was a cheap car with a cheap engine. I would never put a ca18 into any shell thats worth over $200

Anyway, as far as smooth and revvy, the rb20 takes the cake, if ya want to bash limiter all day everyday the rb20 is the engine for you (great wet weather slider for those that dont wanna burn tires, clutches, gearboxes etc every two weeks, but just wanna have fun)

rb26 is also very good, but from my experience the rb20 is still smoother

the 2jz is also very smooth engine with crap loads of torque, not as smooth as the former two, but considering the torque it produces it nice.

all of these are abundant here is aus, and i have personally owned 3 of them and driven all of them


Originally Posted by boostin50
http://http://www.vettenet.org/torquehp.html
First of all, from a driver's perspective, torque, to use the vernacular, RULES :-). Any given car, in any given gear, will accelerate at a rate that *exactly* matches its torque curve (allowing for increased air and rolling resistance as speeds climb). Another way of saying this is that a car will accelerate hardest at its torque peak in any given gear, and will not accelerate as hard below that peak, or above it. Torque is the only thing that a driver feels, and horsepower is just sort of an esoteric measurement in that context. 300 foot pounds of torque will accelerate you just as hard at 2000 rpm as it would if you were making that torque at 4000 rpm in the same gear, yet, per the formula, the horsepower would be *double* at 4000 rpm. Therefore, horsepower isn't particularly meaningful from a driver's perspective, and the two numbers only get friendly at 5252 rpm, where horsepower and torque always come out the same.

In contrast to a torque curve (and the matching pushback into your seat), horsepower rises rapidly with rpm, especially when torque values are also climbing. Horsepower will continue to climb, however, until well past the torque peak, and will continue to rise as engine speed climbs, until the torque curve really begins to plummet, faster than engine rpm is rising. However, as I said, horsepower has nothing to do with what a driver *feels*.


Originally Posted by BlueRB240
Classic train of thought based of assumptions. I can tell You like the KA vs me who doesn't like the KA motor. This is where it boils down personal choice yet again. I love my RB when I 1st did the swap back in 05 and still love it now. I can tell you from my experience that the RB 20 handled the same as the KA S13 (like crap)except I had more power and a smoother pulling motor. If TQ was my goal I'd shoot for a VH45 n/a with bolt on a tuned ecu. That's a low 12 second high 11 second combo. I Don't like the idea of cross breading engine platforms so I couldn't dream of a LS1 in my 240. It's a cool ass swap but not for me. http://www.3rdgearvtec.net/Andys%20Videos/Dynos/S14LS1.wmv


Originally Posted by Black
At the point of where the top end takes over the race is done,track or street unless your doing top end pulls and then we will be dealing with different motors.




I'd like to take the time to personally convey my gratitude to everyone I quoted and all who posted a constructive comment in this thread for the perpetuation of the education of how to make our cars faster and opinions of certain engines.

Though at times this thread may have spiraled into a clash of egos vs. pliable info some of us who have just watched (there are at least 860 view and this thread is less then a week old, I'm sure it's more then just those who've commented ).

In any case I've learned quite a bit in just this thread alone. I plan to accumulate more info as the thread continues.

Thanks,
Soulsultan
2008-12-07 02:47:46
#108
Feeling what the car does is a pretty important part (at least to me) of automotive enthusiasm. Having a broad power AND torque powerband in a 4 cylinder engine is pretty rare, and this is what I like about the KA. KA-T's are very much driver's cars.

Just browsing on KA-t.org, take a look at this dyno graph and tell me you don't like the look of it:

2008-12-07 03:27:16
#109
Originally Posted by insane
I think people have gotten way out of hand with this thread, and its become an intillectual pissing match.
I'm very sorry for what I've done to this thread. I do not like how it has gotten so off-topic because of my posts. I've been told there's a possibility the offending posts may all be deleted. I plead that the off-topic posts related to torque and horsepower be split off into their own thread. If the mods would prefer, I'll gladly create it.

Please read the quote below and appreciate that people are reading, and people are learning.

Originally Posted by soulsultan

Though at times this thread may have spiraled into a clash of egos vs. pliable info some of us who have just watched (there are at least 860 view and this thread is less then a week old, I'm sure it's more then just those who've commented ).

In any case I've learned quite a bit in just this thread alone. I plan to accumulate more info as the thread continues.

Thanks,
Soulsultan


I do hope the thread/discussion can continue as well.
2008-12-07 03:48:53
#110
Cleaned up and few PM sent out.
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