hey all,

i have a 91 240sx with a sr20det swap on 6psi. i was wondering how much can the sr20 motor with stock interials hold for power. what is safe for me to run without having to worrie about blowing the motor.

thanks.

Enough Power to change the gravitational pull of the Earth upon its axis and travel back in time......

lol, as far as internals the sr20 is very capable for holding a good amount of power safely. If your running the t25 I believe that runs out of power around 13psi. Everyone's going to tell you to search.

J240sx wrote:lol, as far as internals the sr20 is very capable for holding a good amount of power safely. If your running the t25 I believe that runs out of power around 13psi. Everyone's going to tell you to search.

thanks for your reply, but im puting in a t3/t4 and 550cc injectors. that should beable to make some power but how much power will it hold safely like 300 400 500 hp??

The sweet spot is 400whp! Some hit 500+whp without blowing anything.

supreamS14 wrote:The sweet spot is 400whp! Some hit 500+whp without blowing anything.

all about tuning a nice standalone and you can make some nice power on stock srs

ok so 400hp do i need any thing to hit 400hp or will i have to change a few things. things like head gasket and head studs or i can get 400hp without them?

badass240 wrote:ok so 400hp do i need any thing to hit 400hp or will i have to change a few things. things like head gasket and head studs or i can get 400hp without them?

the stock gasket is paper and metal for added insurance anything over 300 whp -- it would be good to get an apexi headgasket and some arp headstuds....

ok i got it 300 is safe with stock headgasket anymore will need the upgrades thanks man.

no offense not one to flame but search and learn about your car its been covered.

Just wondering.. I have arp headstuds I installed brand new with a new oem gasket, if I were to upgrade to a metal gasket later on. Is it possible to reuse the arp or will I have to buy a new set?

arp head studs are good up to 2500 psi. I doubt you could really ever crack or break them? your turbo would blow up to little pieces before your head would pop off...

shift_SRDETuser wrote:arp head studs are good up to 2500 psi. I doubt you could really ever crack or break them? your turbo would blow up to little pieces before your head would pop off...

I broke 1 torquing from 80 to 90 ft lbs. Maby it was a defective stud.

Depends on how you drive it and what you are doing to it.

aaronbeisel wrote:Depends on how you drive it and what you are doing to it.

Drag/Street racing it maybe drive in to work once or twice a week.

11 whp

I was recently linked to this thread by someone that had some SR20 questions so i Thought i'd post some details here incase anyone else who finds this thread in the future has some extra information.

If you want a detailed look into the SR20 and path of least resistance for making reliable HP check out this article: https://www.brewedmotorsports.com/sr20det-tuning-guide/

Simply put the SR20 is a solid engine, weak points are:
-oem non MLS head gasket (older non S15)
-oem heads/ports do not flow that good from the factory (port work makes a BIG difference).
-oem valvetrain design is not ideal (check out the link above for easy solutions to this by using dual guided shims)

I regularly have to tune SR engines with a huge range of mods so i've seen all sorts of parts combinations in action over the past 16 years. Up to 400whp the stock bottom end is decently reliable. You can make up to 500whp BUT that is pushing the limits of the stock bottom end and it will end up bending a stock rod at 500+.

-100% stock engine (stock cams/valvetrain/ports/head gasket) Limited to roughly 400hp, cams/head work will help the engine make good power with less boost/stress on the bottom end.
-MLS head gasket, cams/springs/retainers with stock bottom end will make 400-500hp much more efficiently. Using the MLS will also allow you to run a little more boost with a high octane fuel like E85 or other ethanol blends.
-fully built with OEM sleeves: The OEM SR20det sleeves are good to roughly 550-600hp above that you should be running Darton mid sleeves to keep the engine reliable at high power/high boost.

My personal S14 SR20det: