Samj

I've got a 2006 Hawkeye WRX Wagon, I'm about to embark on some engine upgrades including a VF48 Turbo, full decat exhaust system, fuel pump and so on, with the aim of getting to around 350hp.

My uncle has just offered me a Nitrous kit with 2 full bottles for cheap, as it came on a Harley he bought and he didn't want it. I'm pretty sure I already know the answer in that this will push the 2.5 engine/ 5 speed gearbox over the edge, but are you able to offer any advice on what the exact implications of fitting this would be and what would be required to safeguard against them?

The car is going in to RM performance for an engine out job soon and if the kit could be fitted without too much need for additional work, I may still consider it as an option.

the shreksta

iTrader: (20)

is the rest of the car set up to handle more power? Tyres/brakes/suspension etc.
its torque that kills gearboxes so a vf48 running 350bhp on a 2.5 will likely be 400+ftlbs and about the limit of the box.
around 1 bhp will kill the 2.5 engine so if you fit nitrous it's in the hands of god.
why do you need nitrous? Are you drag racing? If it's a street car I see little need for nitrous. Better off just throwing some octane booster in there now and then

Samj

I don't need it no, it was just offered to me cheap so thought I'd at least explore. I expected the above was the case already though and I certainly don't want anything to go pop.

stonejedi

iTrader: (51)

This!!!

.SJ.

lockheed

iTrader: (1)

Ok I know the 2.5 is not suited to nos applications , but what engine situation could you use nos and what management is favourite .

Perhaps some one with Nos experience could say a word or two .

MarkRF

I’ve used it, not on a Subaru but on BMW’s.

You’re better off asking on a specialist forum like that of the wizard of nos rather than on a general car forum as for most people who have zero actual experience, the fast and furious has poisoned people’s minds against what is a very useful and within reason safe power modification.

lockheed

iTrader: (1)

Mark thanks tell us about your experience with the BMW brand Cheers and how you controlled it .

MarkRF

I used a wizard of nitrous “direct Port” wet kit running approx 100bhp progressively controlled by their maximiser digital controller which allows you to ramp up the shot - starting at say 20% up to 100 over a preset time in seconds to make it kinder on the engine and drivetrain in terms of building up the shot rather than just an instant hit.

Wet kits are better as they add fuel and nitrous into the combustion cycle. I only ran a direct port kit with 6 injectors due to the design of the inlet manifold - I’d imagine Subaru inlets would be the same.

The power was good, useable, never had any reliability issues for the year or so I ran it. I used a smaller bottle 5lb I think? With bottle heater. How often I refilled it just depended on the type of use. It could empty it in less than half an hour of heavy use.

insurance wise, flux covered the kit to be on the car but not “active” so make of that what you will..

lockheed

iTrader: (1)

Good , in the generic sense , is there kinder rpm to deliver said shot obviously not 500 rpm perhaps 4000- 5000rpm would be more gentle on the motor? can this be controlled by the ecu? Stone Jedi, you seem to know a lot about this

MarkRF

I’m fairly certain the newer controllers can account for rpm, throttle position, intake temp etc. You generally only want to be using it at WOT and in the right gear to be accelerating - not under load.

I can’t really comment on the suitability of the EJ motor but I’d imagine in moderation it would be no less reliable than adding the Same power by any other means.

DAN@ADRIAN FLUX

Hi.
If you need any help with insurance at all then please feel free to drop me a line.
Regards,
Dan.

lockheed

iTrader: (1)

JDM_Stig

iTrader: (3)

Wet Nos kits are awesome fun, You can slap a 50 bhp kit on pretty much most cars and have fun,
Anything big jet wise does need the progressive controllers,
Been using Nos for over 20 years now,
Currently have Nitros Express kit, Im not a Wizard of Nos fan, as they used crappy pipework,
I prefer the kits with braided lines.