Jza

Hey folks,

Have decided to banish the PPP on my MY01 WRX for some proper kit.

The options i have are a 270 bhp kit (decat + remap).

OR

Around 300 bhp (decap + new VF34 turbo + remap).

Anyone whose made the jump - is the extra 30bhp worth the extra £1000.

Any views on which kit to go for?

Quick other questions:

Are the VF34's laggy?
Should i insist on a new fuel pump @ 300 bhp?
Will the transmission cope @ 300bhp

Cheers!

Jza

alloy

You will definitely notice the additional 30bhp

I have read that the WRX box is generally at its limit in excess of 300FtLbs but there are several people running higher figures with no detriment, where as others have blown the box

new fuel pump is a good safety measure, and worth the extra 100quid or so for that margin IMO

The Chief

Not an expert but here goes.

Transmission should be fine - although the clutch might be a little overwhelmed - maybe think about an uprated clutch.

if its a bigger turbo then maybe it will be a little more laggy but the scope for further mods are greater.

Mine is running a td04 at 280 'ish and is loely fast road car - if maybe a bit breatless right at the top end.

I would uprate the fuel pump - i did after my remap.

wilb

I heard a 10bph is noticeable anything less isn't, you should be fine. Why not just part ex the WRX for a STI?

Tripple'O G

Transmition WILL need to be looked at because over 300lbft and it WILL pop........I know

The VF34 isn't all that laggy at all.........all subaru turbos are tiny so you'll never get that much lag anyway....

welcome to the chasing figures game, you better have some money i your pocket

Jza

Thats a good point .... but figured the STI p/ex will cost 5 * as much as the upgrade....

Jza

The Chief

Jesus - dont say that.

mine has been remapped recently running at 280'ish with about 300lbft torque - your getting mne worried now.

Tripple'O G

Hate to say it but mine was mapped safely at 305lbft and it blew the third gear into tiny tint pieces on the way back......

be afraid, very afraid.

alloy

You drive it like you stole it though Tripple , there are more consrervative drivers that haven't blown a gear box with over 340ftlbs

The Chief

I'm what you say a quick driver - crikey i'd better be a bit more careful then

hojkoff

If you're going to spend all that money increasing the power then you're going to want to drive a bit crazy some time or another. That’s sort of the point.

Jza, if you're really thinking about this then you should defiantly up rate the gears at the same time because,

1. If you don't you're always going to be worried about when it'll let go. If you do the upgrade you'll have peace of mind.

2. You don't really want to be on a nice sunny Sunday afternoon punt in the middle of no were and have the gearbox pack in.

3. Braking down is humiliating no matter what way you look at it. It’s also a huge hassle and you never know what you’ll be in the middle off. I'd know, I drive a Peugeot...

Oh and a 30bhp increase is an 11.1% increase. That’s quite a bit.

I donno if I agree with that. 10bhp increase on a 40bph Mk1 Micra is 25% which will make you feel like you're being sucked into the back of your seat if you're used to one of those things! But the SLR has 630bph and a 10 increase is only 0.016% which really is nothing.

New_scooby_04

iTrader: (4)

1) Higher boost threshold and slightly more laggy than the Td04, but bigger and longer shove. If you port the headers, it'll bring the threshold down and improve the spool, thus be even more comparable to the Td04..... if my understanding it correct

2) Yes. It's a good safety modification and, apparently, it does affect the way the car is mapped, so best to get it done before!

3) They vary greatly and it does depend on driving style. If you don't do drag starts and feed the power in, it'll probably be ok, but If you go over 300ft lbs on the UK WRX box, the common concensus appears to be: "don't be surprised if it breaks".

The std clutch will probably slip first though. It's the torque that breaks gearboxes as oposed to bhp, so I'd imagine you could ask the tuner to not tune it conservatively in an attempt to minimise the risk of anything going pop.

Ns04

RA Dunk

i thought the breaking limit of the wrx gearbox was around 350 bhp and similar torque??

New_scooby_04

iTrader: (4)

There is no set figure mate. Some let go at std power levels Others lst a good while at much higher power levels.

Type of usage is a BIG factor though, as is the type of turbo you use, TD05s tuned to their potential can eat Uk gearboxes by all accounts!

300ft lbs isn't a limit as such, it just seems to be the point when people agree that if you tune much above this, you shouldn't be surprised if you have problems; that's not to say that you definately will!

Ns04

GazTheHat

I thought that was the STi ?

Jza

Yeh thats what i thought...

So anyone actually sampled a 270 bhp (about the max a decat + remap goes as i understand) vs a 300bhp car... is there a BIG difference... cause if not then maybe im better sticking to something the drivetrain can handle?

Jza

Tripple'O G

I was running 270 before I had the re-map and then it shot up to 340 with the re-map.......to be honest bhp wise there won't be a huge difference......it's all about the torque........and that you WILL notice.....

MadMark

Mine was an almost standard 03 WRX and I've had Powerstation do me a Tek 3 with an APS 3" system and Sports cat.

Headline figures were 260bhp and 270lb/ft torque - but the latter is almost flat from 3,000rpm to 6,000rpm. It's the torque that makes the difference as it piles on revs like a mad thing! However it's now a bit breathless at the top end.
According to Rich at Powerstation, an up-pipe will give me another 10bhp or so (and a similar amount of extra torque) and improve top end breathing - but to get the best out of it I need a VF34 ..... which will give me an easy 310bhp! Needless to say I'm saving up.

In essence get it all done together as this will give you one hell of a package that still (just about) makes financial sense!

Neilo

where as mine is running around 400lbft, and having given it a thorough raping on sunday at SSO its still tickety boo some are stronger than others, dont be put off......

SamUK

iTrader: (1)

Its all about the Torque...

RA Dunk

God ive gone all paranoid now

Tripple'O G

Definately get it done all together.......and get someone who knows what they're talking about to get it all done to!

No point getting down the line after the turbo, fuel pump, complete de-cat, gearbox and then think, "Hmmmmm, I wonder what will help throttle response...." you may as well get the lightened flywheel, bigger injectors, fuel pressure regulator, water pump......er......hang on, thats what I did

New_scooby_04

iTrader: (4)

You took your time!!! Welcome to Scooby ownership if it's not worrying about Mafs, big ends and kn(c)ocklink displays, it's fretting that your gearbox is going to blow up!!

A bit of paranoia is par for the course. Just get on with enjoying the car!!!

Ns04

SamUK

iTrader: (1)

how about the TSL 333 conversion? they do it all... 333bhp/333lbft

Neilo

only for the sti though

alloy

For STi's

New_scooby_04

iTrader: (4)

Hey Tripple O G, how ya doing?


Have you got any beer money left after spending all that on your car!?!?!?


Ns04

alloy

Neil you're too quick ... is that why you're SSO handling champion?

Tripple'O G

hello mate how you been?

Funny but no as it goes.........however it's up for sale now as i'm fed up with the niggly things.........so back to basics and time to work my way back up!

Neilo

something along those lines....