Thread: Sr20De(rr) with SR16 piston

Do you know why ?

mapping no doubt

I thought same thing. It will never run ok on stock ECU...

Why not ? I currently run all bolt-on,S3R and ''20V'' green injector and without tune it ran near perfect and ran 700 kilometer/450 miles on a tank full of 94.

So if i raise the compression ratio by two point,give some overlap to the cam timing and back up the timing I can't see the problem ?

i need to explain a bit, i run it with a stock ECU but mine ecu is a lot richer than later models, also i made +/-5 degrees to the S4 cams to reduce the compression, with S3 and stock setting of the cams the compression will be too high you need more over lap to reduce it, its still high it'll be great to use 270+ degree cams to reach around 13 compression
( not compression ratio )
p.s. i spoke with a ppl around here who build race engines and cars all of them told me that the setup is good but, compression is best to be around 13-13.5, so for SR16 pistons will be great match 280 degree cams the car will then run without LAG from the big cams and with very high mid top power and torque
( those ppl actualy build 2.0 liter 280-300hp N/A cars )

to argue with the above opinions, with those pistons even with smaller cams, and stock ecu, the car run and feels a lot better with more torque it runs like a 3.0 engine with normal driving

rnd2k the info you are giving him is not that helpfull because he is running a Roller Rocker lowport motor which only has one cam combination, that being the JWT S3R.

^ one cam option? there's about 5 options for the lowport roller rocker.............

ok, well list them. I have mostly messed around with the regular low port and highport cams. So for the RR motors I have never looked passed JWT S3R.

Maybe overseas ?

I just searched and cannot find a RR specific version of a Tomei cam. Are you sure you aren't using a none RR cam? They drop right in and work (I've done it)... But not correct profile for a roller rocker.