my buddy wats to boost his 03 rsx. he doesnt have an account on this site so im asking for him..I was wondering how much boost i could run with a stock k20 a3?
it will be a t3/t4 turbo.

help is greatly appreciated

 

Well firstly, contrary to popular belief, the k20a3's are just as strong as the k20a2's...there is a compression difference, and little things like that but the internals are the pretty much the same. I wouldn't recommend far exceeding 300HP on stock internals, nor is it very likely, so i'm going to say around 15PSI.

This Link right here will provide you with all the info you will need.

http://forums.clubrsx.com/showthread.php?t=536704

 

oh alright.. thanks buddy

 

second!! T3.T4 is not a turbo! Thats the flange.. meaning your buddy has no idea about turbos but knows that people always say t3/t4

Better do some homework

 

lol easy easy...you are so trigger happy...

 

you might wanna search that again

 

he never said he knew anything about turbos..
i dont know much either.. thats why im in the learning process.
my signature/motto is for people like you (type-'s'paz)

 

Burn! lol

 

lol i'll give you something to search smartass...haha you're always trying to find flaws

 

i am just trying to help you out man, the ep3 bottom end isnt built for a high power motor, anything above 300whp is pushing it

 

You don't even want to go there buddy so if I were you stop running your mouth and just park my car because you wouldn't even last 1 second against S'paz beast!

You obviously don't know how HT works so do some homework/research and come back to us with a real question.... not one that has been covered a billion times!

 

As much as I love my EP3 the A3 is nowhere near as strong as the A2... don't get me wrong its a fun engine but its not built for full out performance! Plz don't argue the fact its been talked about for the last 7 years...

 

I've seen a few people who boosted their k20a3 base rsx motor. It worked great but its not that fast

 

Nobody said it wouldn't work its just that it can't handle too much boost for a long period of time... Nothing more then 12 psi

 

Oh i know trust me thats why i sold the ep an picked up the accord. Cu i can build the accord for cheaperwith a more pwerful and reliable motor for less than what the total cost was coming to with the ep. If i still had my ep. I wud go jrsc straight. With the other basic bolt-ons, kpro and tuning would have got me anywhere from 230-270 with higher psi!! I wud still go that route if i was any ep owner, 250whp for the ep a3 is enough and it wud be reliable!

 

Yeah but 12 psi would be a nice enough for decent quickness...sure it wouldn't be able to perform as well as other cars but it's still not bad...and with the lower compression, it should be better for boosting. I would be satisfied with 300WHP...and I could make that safely, right?...a guy on club RSX covered this topic...his turbo base made 305WHP

 

and i've been doing a lot of research on this topic and everyone seems to have different answers...which is why I asked

 

Wow lots of misinformation in this thread.

Two things wrong with this statement. First, A3 rods aren't nearly as thick/strong as A2 rods, so they are NOT identical in strength.
Second, PSI is irrelevant to power output. I could be running a tiny little turbo @ 30psi and make the same power as a GT35R @5psi. Shoot for total power output, NOT psi!

Not here, buddy.

Not this crap again. Seriously. Target power levels, NOT psi.

 

Careful...DaveSi will chew you to pieces.

 

lmao I had the same question but the turbo I’m running is the GT2871R. Just don’t run it past 300 hp unless I forge the internals?

 

Ive been doing some re-search and ive gone thru some trial and error with parts for my car which ive learned alot from. But ive found very few stock K20A3 pushing above 400HP and by the looks of it the 2 that ive found had modified the head such as homeboii slowrsx with the built head with supertech everything lol. Also there was a video on youtube that is couple years old that had a k20a3 stock bottom end with a vtec killer set up valvetrain of a k20a2, turbo making about 416hp. Now with my set up i dont think i will push the engine beyond 400 just because there is not alot of evidence that it can hold that power for too long, but it is possible to make that type of powerband. So this is my set-up right now on stock internals K20A3:

Turbonetics 60 Trim Turbocharger w/ Intercooler
T3/T4 Cast Manifold
Turbosmart Wastegate
FIC 1000cc Injectors
AEM 340cc Fuel Pump
Stock Clutch
Premium 93 Octain
PRB Intake Manifold
REV HARD Blow Off Valve
Thermal R&D 3in Exhaust

Made 275HP at 15PSI of Boost

The only downfall of this was the clutch, it was giving out and slipping. Also the fuel duty cycle was getting too high and the reason behind this was i wasnt running a fuel return setup. The oem fuel pump assembly has a built in restrictor that needs to be bypassed and the car needs to run a external fuel pressure regulator to increase fuel pressure without maxing out the injectors. The new setup will be:

Competition Clutch Stage 4
Exedy Light Weight Flywheel
RBC Intake Manifold w/ Blox 70mm Throttle Body
Deatschworks Fuel Return Kit
E85

So with this we should be making about 350hp without raising the boost pressure much, just running E85. But we shall see once i finish it up.

UPDATE: With all the new upgrades and running E85 fuel without opening the engine (stock internals) the RSX made 340 HP / 300 Torque at 20psi of boost. The Tuner mentioned that my intercooler & piping were restricting it from making more power due to the fact that more boost pressure didnt make a difference in the powerband. Its when he lowered the boost pressure that made it gain some power. Here is the link to the tuners video, their is 2 parts to the video but i already described the previous powerband.

You Tube