sr20det or turbo ka24

[xero1]

should i rebuild the ka24 with new pistons, rods and add Greddy KA24DE TD06 Bolt On Turbo Kit or go with a JDM Red-Top sr20det 91-93 Silvia , i am planning on getting a 93 240 coupe. which would be the cheepest way

[240sxka25det]

either way you go your gonna wanna put forged pistons 8.0: low comp.made for high boost in the motor I prefer the ka24de for the forged crank and rods the crank is alot bigger it has better rod ratio 1.72:1 compared to the sr20det ratio of 1.58:1 sr also has forged crank and rods it has low compression pistons ka24de has a stronger block and you need some cams to rev like th sr20 but same turbo, fuel, fmi, and cams the ka well have more whp and alot more torque but price wise the sr20 maybe cheaper way to go but change the oil and water pump before you get to rolling and maybe thicker metak head gasket due to the gasket blowing alot but w/ any motor it need to be tuned right to last

[Nismo_Freak]

either way you go your gonna wanna put forged pistons 8.0: low comp.made for high boost in the motor I prefer the ka24de for the forged crank and rods the crank is alot bigger it has better rod ratio 1.72:1 compared to the sr20det ratio of 1.58:1 sr also has forged crank and rods it has low compression pistons ka24de has a stronger block and you need some cams to rev like th sr20 but same turbo, fuel, fmi, and cams the ka well have more whp and alot more torque but price wise the sr20 maybe cheaper way to go but change the oil and water pump before you get to rolling and maybe thicker metak head gasket due to the gasket blowing alot but w/ any motor it need to be tuned right to last

You might wanna use what we like to call ... a period.

Either way, this has been discussed to the death and there are alot of misleading ques in the above post so take everything you read with a grain of salt.

Ex.

either way you go your gonna wanna put forged pistons 8.0:

Way to low for a modern turbocharged engine and the pistons in the SR20DET engine are very strong. The KA pistons have done well as well. I don't see a need to replace the pistons in either engine for a low boost application.

in the motor I prefer the ka24de for the forged crank and rods the crank is alot bigger it has better rod ratio 1.72:1 compared to the sr20det ratio of 1.58:1 sr also has forged crank and rods it has low compression pistons

Both motors have equally forged crankshafts, in fact the SR20DET engines crankshaft is better balanced due to the greater number of counterweights.

The rod ratio in the SR is better suited for HP production than the KA, due to the increased upper rpm cylinder filling. It also is shorter and lighter which makes the SR20DET engine much more responsive and capable of higher RPMs.

ka24de has a stronger block and you need some cams to rev like th sr20 but same turbo, fuel, fmi, and cams the ka well have more whp and alot more torque

The KA has not proven to have a stronger block, it is very rare to see a block failure in either engine. Aluminum blocks get their bad reputation from the sleeve style Honda blocks. The SR is essentially a solid aluminum block that has been taken well over 550rwhp on stock block by several different tuners.

The KA does not necessarily produce more whp. In fact they typically output about the same whp and maybe 10whp more torque than the SR20DET engines using a much larger turbocharger albeit at lower boost pressure. The production of whp is a direct corelation of RPM * TQ / 5252. Since the SR can output more RPM and it has a greater ability at making top end torque due to the various differences between the two engines it has a greater opportunity of making higher HP. In fact the SR engine has yet to be surpassed by any KA in HP production.

HP wins races, not torque.