www.jsamotors.com

There are 4 main SR20DET motors made available to us by importers. Let's do a quick run down of each one.

Redtop

* 1991-1993
* S13 Silvia & 180SX
* 202 hp @ 6000 rpm
* 203 lb-ft @ 4000 rpm
* Garrett T25, 0.64A/R Exhaust
* 0.80A/R Compressor
* High-port head
* 370cc/min injectors
* Red valve cover

Black Top

* 1994-1998
* S13 180SX
* 202 hp @ 6000 rpm
* 203 lb-ft @ 4000 rpm
* Garrett T25, 0.64A/R Exhaust
* 0.80A/R Compressor
* High-port head
* 370cc/min injectors
* Black valve cover, flat on top
* Better pistons, water pump, oil pickup than the Redtop

Notch Top

* 1994-1998
* S14 Silvia
* 217 hp @ 6000 rpm
* 203 lb-ft @ 4800 rpm
* Garrett T28, ball bearing 0.64A/R Exhaust
* 0.60A/R T04B Compressor
* Low-port head
* VTC variable intake
* Cam Timing
* 370cc/min injectors
* Black valve cover with a hump that peaks at cylinder No. 3

S15 Notch Top

* 1999-2001
* S15 Silvia
* 247 hp @ 6400 rpm
* 202 lb-ft @ 4800 rpm
* Garrett T28 ball bearing, 0.64A/R Exhaust
* 0.60A/R T04B Compressor
* Low-port head
* VTC variable intake
* Cam timing
* 480cc/min injectors
* Better materials in turbo and better wastegate flow design
* Black valve cover with a hump that peaks at cylinder No. 3

Information Source: www.nissantech.com