Can SR20det stock internals withstand 300rwhp? Does SR20det hv enuf power to push an A31?

Answeres to questions asked by mapler520.

TOPIC: Can SR20det internals withstand 300rwhp? Does SR20det hv enough power to push A31?

hi,

received ur sms, thanks again for reading my blog. i'm just sharing information basically, hope it can be useful to anyone who needs advice :)

ur question...can sr20det internals withstand 300rwhp and can it does it hv enuf power to push heavy a31 right?

1st question: can sr20det internals withstand 300rwhp?

yes it can. i think stock internals can withstand up to 320rwhp...with stock internals, if u hv 280 to 300 rwhp is just nice. however, forums in US/australia mentioned that it can hold more than 320 rwhp.

the fact is...with higher HP, engine get more stress..i.e. combustion pressure and temperature is higher, intake pressure/temp is higher, therefore, result to higher overall engine temperature, higher thermal stress to moving components, maybe higher vibration....and normally higher oil temperature and engine coolant temp and etc etc..another thing, engine tuning...i.e. knocking. if ur engine is pushing 300rwhp with a lot of excessive severe knocking, you will break ur internals eventually. i learn this the hard way...trust me.

all these stress if severe and not countered properly that makes and engine internal fails. therefore, if u want to go 300rwhp with stock internals..u need to make sure u are well equipped with the engine support system i.e.:

-proper engine cooling system: oil cooler, good radiator & fan, water pump
-proper engine lubricating system: oil pump, regular oil change, always monitor oil press and temp
-complete support modifications: fuel pump, fuel regulator, injector, intercooler, radiator
-tuning: get ur engine tuning right, u need to hv at least a piggyback ECU...full standalone ECU is the best...get a safe boost/engine knocking level

i.e. my previous setup with stock internal...2871r, power fc, 1.3bar boost, all the common support mods i.e. GTR fuel pump, denso 550cc inj, fuel regulator...safe knocking level...i whack the engine kaw2 every week on drift practice...in competition memang takde kesian punya whacking...for 1year..no problem at all. i always monitor oil pressure & temp (make sure oil press & temp normal especially at higher engine operating conditions), monitor water temp, exhaust temp & fuel pressure.

u need to know your engine limits for critical engine parameters:
-oil temp: 90degC normal condition, make sure < 120degC at extreme condition
-oil press: 3 to 4bar at normal engine operation, > 1bar at idling speed @ extreme condition (i.e. at 120degC oil temp)
-water temp: 90degC at normal cond, < 95 at extreme condition
-fuel press: just make sure optimum fuel pressure supply, be alert if ur fuel press drops abnormally while driving! something must be wrong if this happens..i.e. fuel pump/inj failure and etc.
-exh temp: 600 to 850degC at normal cond, make sure < 950degC at extreme condition. exh temp can be controlled with proper fuel mapping
-engine knocking: make sure u don't exceed K1 knocking (1 knocking every 10sec). knocking can be controller with proper ignition mapping

i think that's about it to hv a safe 300rwhp with stock internals.

possible factors that can fail a stock internal (or even forged internals if in too xtreme conditions):
-insufficient lubrication: simple...not enough lubricating oil, poor lubricating oil film thickness around moving engine components, especially on crank n rod bearings...they end up rubbing each other without oil at certain areas...build up heat...failure, metal deformation, damaged n etc.
-too high oil temp, cause oil properties to break...can't form proper oil film thickness
-too high water temp...will increase oil temp thus further increase metal temperatures i.e. piston, rod, crank, bearings, valve bridges temperatures..
-too high exh temp...normally caused by insufficient fuelling, always associated with knocking conditions, failure to piston and valves i.e. piston melted, cracked

2nd question: does it hv enuf power to push an A31?

YES, no problem at all.

if you see in terms of facts and figures....a 300rwhp and letsay 360 Nm torque sr20det can easily push a31...comparing to a 260rwhp RB25det or 300rwhp 1Jz...the numbers speak for themself :).

except that..the characteristic of all these engines are different having the fact that SR is 4cyl, RB and 1Jz 6cyl..diff piston designs, diff bore:stroke ratio and etc.

i believe...if u hv a 330rwhp SR20det in an A31 with a response setup..the car will be really quick, fun to drive and hv good handling due to better weight distribution of the lighter SR engine :)

in fact, there's a lot of SR powered A31s in japan/australia that are very successful in drift competitions...competing at par and sometimes better than high powered RBs and 1JZs powered A31s

hope this info is sufficient for now :)

p/s- how did you know about sr20det upgrade topic in my blog? :)