i am about to buy a sr20det s13 redtop... now i here on websites like srswap.com that there are different compressions and different kinds of psi like 120psi acroos and some that are 150psi's. how do i know im getting the best motor? is there any inscription on the motor or some way i can tell. i walso want the low compression motor. and the one that has Garrett T25 with a 0.64A/R. with 202hp.

and also... what do u think is better the blacktop or redtop sr20det s13's? and why?

 

compression test the motor you buy...the person you buy it from should be willing to do it infront of you. The compression test lets you know that each cylinder is holding compression(should be 120-150 for each cylinder, any lower and i wouldn't buy it). both the redtop and black top s13 sr20dets come with a t25. Do some more reading and try the search button. Good luck

 

i got the red top...no huge difference....and it's cheaper. Low compression motor? Unless i'm mistaken both s13 black and redtop's are 8.5:1 CR

Specifications



Red-Top S13 SR20DET 180SX 91-93 and Silvia 91-93

Black-Top S13 SR20DET 180SX 94-98







Displacement: 1998cc (2.0 liter) Cam type: DOHC 16 valve, chain driven cam sprockets

Bore and stroke: 86mm x 86mm Compression: 8.5 : 1

Horsepower: 205hp at 6000rpm Torque: 203 ft/lbs at 4000rpm

Stock boost: 7 psi Throttle body bore: 60mm

Turbo specs: Injector size: 370cc/min

Compressor: T-25, 60 trim 56mm BCI-1 compressor.

Turbine: T-25, 62 trim 53.8mm 0.64 A/R turbine housing.

Center Section: Journal bearings



Aluminum alloy block and head with steel alloy sleeves. Distributorless, crank angle sensor activated ignition, direct fire coil packs. Stock SR's come with an internal wastegate, a knock sensor, a side mounted intercooler and a bypass valve that is routed back into the intake after the MAF before the turbo. Stock turbo outlet is 1 7/8 inches, inlet and throttle body are ~2 1/2 inches.



Performance:

The stock turbo will be safe to 13-15 psi. After that, the turbo is past its efficiency range, and power increases will fall off and are not worth the risk of turbo damage. The engine should produce 230-250 RWHP at safe boost.



Required Parts for the install:

Engine, transmission, alternator, starter, power steering pump, Crank Angle Sensor, ECU, harness, MAFS, Power Transistor / Ignitor Chip.




Fitment:

Fits into US 240SX S13 chassis with no modifications. Uses the US 240SX of the host chassis driveshaft and differential. Uses the standard downpipe and catalytic converter with the 240SX catback exhaust.

Got that from srswap.com

 

120-140 on the compression test is on a cold motor, 150-170 is for a hot/warm engine.

 

120 kinda sucks I'd stay away from that one. ONce you've turned the engine over a few times(make sure with oil in crankcase!), the rings will seat with the oil pressure and you should get 150-170 PSI on a good condition engine.