Power Gains Spec R

[RagamuffinRyan]

So I'd like to eventually have an S15 running around 320 - 350 bhp tops.
I understand that the clutch would probably need upgrading but i'm unsure what sort of torque/bhp figures require and upgraded clutch kit

What sort of modifications would be needed to get this amount of power?
I'd assume you can get it with the stock turbo, which I would prefer.

I've assumed:

3" turbo back exhaust/Hi-Flow Cat
FMIC
Dump Valve
Wide Band
Injectors (no idea which)
Cams
Remap

Possibly:
Larger Turbo
Clutch Kit


I'm just doing research for future reference, i'm not looking to buy a silvia just for power gains Its the good looks I want them for.

I'd like to hear from people who have an s15 with this sort of power ideally and how much this can cost :|
I tried a search but can't seem to get what i'm looking for, i know this subject will have come up many times on the forum and i'll apologise in advance for this.

 

[shane_o]

would save yourself loads if you bought one already like it. for 350 from a standard spec r your sort of right,
cams are not needed. and 555 injectors would be fine. need a fuel pump and z32 afm. and the standard turbo is only any good for 320 ish?
cost wise from standard if you were buying all new parts 6 grand plus. quite shocking but do able for a lot less with second hand parts or a mix of.

its cost me roughly 3 grand to get to 352 bhp, and my car had most of the bits already!
worth it though, flys lol.

 

[haz's S15R]

Welcome along mate, whereabouts in south wales you from? I've pm'd you too...

 

[RagamuffinRyan]

I've replied mate, didn't think someone so local would have my car

also, for so reason moderators need to keep approving my posts, even though I've validated my account.
its starting to irritate me now, so if 2 responses magically show upon this thread I apologies.

 

[Nicely]

Irritate or not, all new forum members have to have their first five posts approved. The alternative is to be overrun with spam. Since implementing this system, we've gone from several spam posts a day to zero attempted spam posts... So, we hope people appreciate the reason for the slight inconvenience...

 

[S15_SAM]

I defo appriciate it nicely! Better than that Driftworks forum, that gets about 20 a day!

 

[pegliobaglio]

I agree , is definitely good that new users are checked as no one likes spam!

welcome mate, this has been covered lots of times and there is a thread in the useful links page to what is needed, general rule is 320 max on the standard tubby
This is just a general guide for what mods are required for boost upgrades. People have different opinions about this, but If you stick to this guide you should be ok.
This does not take into consideration essential things like suspension, brakes and clutch improvements that will be required at an early stage.


Standard - 0.7bar boost, 250PS
Curb weight 1200–1270 kg


Stage1 - 260-280bhp
Free flow air filter
Free flow exhaust
Uprated fuel pump
Boost controller to achieve 0.9 bar boost pressure
Cooler spark plugs
Super unleaded fuel
Custom ECU remap


Stage 1a - 270-290bhp
Free flow air filter
Free flow exhaust
Uprated fuel pump
Boost controller to achieve 1.0-1.1 boost pressure
Front mount intercooler
Cooler spark plugs
Super unleaded fuel
Custom ECU remap


Stage 2 - 280-300bhp
Free flow air filter
Free flow exhaust
Uprated fuel pump
Boost controller to acheive 1.1-1.2 bar boost pressure
Front mount intercooler
Cooler spark plugs
Super unleaded fuel
Custom ECU remap


Stage 2a - 290-310bhp
Free flow air filter
Free flow exhaust
Uprated fuel pump
Boost controller to acheive 1.2-1.3 bar boost pressure
Front mount intercooler
Tubular manifold and uprated turbo elbow
Uprated dump valve
Cooler spark plugs
Super unleaded fuel
Custom ECU remap


Stage 3 - 310-330bhp
Free flow air filter
Free flow exhaust
Uprated fuel pump
Boost controller to acheive 1.2-1.4 bar boost pressure
Front mount intercooler
Tubular manifold and uprated turbo elbow
Nismo 555cc/740cc injectors
Z32 AFM
GT28RS or GT2871r turbo
Uprated dump valve
Cooler spark plugs
Super unleaded fuel
Custom ECU remap


Stage 3a - 340-360bhp
Free flow air filter
Free flow exhaust
Uprated fuel pump
Boost controller to acheive 1.3-1.4 bar boost pressure
Front mount intercooler
Tubular manifold and uprated turbo elbow
Nismo 555cc/740cc injectors
Z32 AFM
GT2871R turbo
Uprated dump valve
Cooler spark plugs
Super unleaded fuel
Custom ECU remap




Stages beyond this will require internal head and bottom end work too..

 

[RagamuffinRyan]

I didn't mean for that to come off as it did, first forum I've ever used to have so many posts accepted before you can post willy nilly, so just confused really.
thank god its only 5


from the look of this then i'm looking to head towards the limits of the stock internals.
Thanks for that Peglio that was quite informative.

think i'll definitely be buying second hand parts or a car that's had most the work done to begin with