can anyone tell me what parts i need to get 300 hp

[derwinmd]

hi was wondering what parts i need to get the most from my engine.. my current setup is pretty standard, never been dyno'd.. what power would a standard s15 put out..?

boost @ 0.5 bar
fmic
induction kit
cat back s/s exhaust pipe.

Thanks..

 

[Matt_S]

Fuel pump, Full front back exh system (makes it easier)
Super unleaded
Plugs maybe
And you may squeeze it out of the std map/inj.
The inj hit their max really at 300bhp - not good, so its advisable to go for a remap with some bigger inj.
Bar of boost and youre almost there

 

[S15RKM]

Fuel pump, Full front back exh system (makes it easier)
Super unleaded
Plugs maybe
And you may squeeze it out of the std map/inj.
The inj hit their max really at 300bhp - not good, so its advisable to go for a remap with some bigger inj.
Bar of boost and youre almost there

Maybe a tubular mani also. I would change the injectors and the plugs as Matt says. Maybe go for a new ECU that can be reprogrammed easily rather than a chip. 300 should be easily achievable

 

[Yakozan]

I got 290bhp on the fly a couple of years back from the rollers with a peak boost of 0.74bar. I don't really trust that figure though as it seemed a little high (about 16% drivetrainloss calculated). But got around 243hp on the rear wheels I think.

Not sure about the spec as it was some while ago, but I think it was:
FMIC
colder plugs
Pod filter
Walbro Fuel pump
exhaust (can't remember if it was turboback. I think I had the cat on and stock downpipe)
boost controller (not setup which is why I got 0.74 Bar peak.)

I think that was it.
Running a bit more boost now so should be abit more. I don't feel like I need much more on the street anyway. car is too tailhappy as it is lol.

Edit: Forgot the fuel pump

 

[Matt_S]

YOu dont need a manifold for 300bhp. But the SRs sound so god damn ugly with the std manifold, thats reason enough to change it!

 

[derwinmd]

ok what size injectors are recommended.? and ecu what make..? already have a downpipe and plannining on gettin a manifold.. should i get a 255lph fuel pump..?

 

[Yakozan]

The Walbro 255L/h hp is what most here use I beliave.
Straight swap for the factory one.

edit: fuel pump should be amongst the first mods.

 

[Hunts15]

ok think this question might eventually come but at what bhp do you get a thicker head gasket ? terrified of blowin another sr20
and sorry to invade your post

 

[subzero]

might be worth it anyways for ya to get the metal head :nod: . save you worrying.

 

[david]

i dont know how u blew the first one so fast

 

[Hunts15]

no didnt blow the s15 had a 200 before it

 

[Matt_S]

std gasket ok for 300bhp. :thumbs:

 

[subzero]

std gasket ok for 300bhp. :thumbs:

if doing any bit of drifting or trackdays surely it would be better off getting a metal head no ?

 

[Matt_S]

No, just use a Higher spec rad (Koyo etc) and a better oil (10W 60 maybe).

If youre going on a track/drift day then oil temp gauge is always a good move. And/or an oil cooler for that matter!

 

[raytsang]

i'm running standard head gasket at 1.2-1.3 boost (dame boost creep)
and im making about 360bhp at fly
no real issue with head gasket yet. think its because E85 run's cooler.

 

[sniffy]

hey ray did you get your clutch done after what one did ya go for ?

 

[Dizz]

I got mine dyno'd the other day just to see what it's running before I start modding

After sorting out the boost (was a restrictor missing) I got the following:

210.2 bhp (at the wheels)
225.6 lbft (at fly of course)

Thats with Blitz front mount, blitz filter & Nismo cat back & no boost mods so I'm happy enough considering that was on 95 octane normal pump fuel...

I have a Walbro on order, only cost me about €90 if you want a link

 

[S15RKM]

YOu dont need a manifold for 300bhp. But the SRs sound so god damn ugly with the std manifold, thats reason enough to change it!

So it does they look better as well and improve engine breathing, not necessary but you may as well do it now rather than later
Still on standard head gasket also running 1.3bar(peaked at 1.47) and no problems

 

[Hunts15]

@dizz throw up that link for the walbro dude will need to purchase soon

 

[Matt_S]

The std manifold gives better low end torque, but the tubular manifolds aid you with more top end. ANd obvioulsy the potential that the std one cant offer (much over 330bhp you actually need a tubular manifold!