WRX marv

hi i have a 93 import wrx with a td05 turbo on ,could any 1 tell me what size (ie 16,18 or 20 g) it would be please...& what kind of max bhp will cope with

scoobycraig

if it's standard it'll be the 16g and max bhp is 350ish

WRX marv

thanx mate best get my decat pipe on & a 1 of those polar performance chips

TonyBurns

iTrader: (3)

Id sort the brakes out if you have not done already, the 2 pots suck big style oh and run the car on super, they dont take kindly to unleaded if you didnt know that already.

Tony

WRX marv

brakes not to bad,upraded discs & pads & no abs ...yeah now about running it on super,forgot 1 day tho & give it some on narmal unleaded & it spat it's dummy out lol ...thanx anyway fella

myblackwrx

iTrader: (1)

uprated fuel pump is a good idea.

2 pots with uprated bits are alright but 4 pots are a lot better

350bhp is taking it to the extreme (if that's what you want) but then you are getting into the realms of uprated clutch and gearbox.

TMIC is pretty inefficent in the early cars.

WRX marv

id be happy with any where between 300-350 bhp,i aint got the budget to go mad with bigger turbos & forged internals

been thinking about upgrading for a late spec tmic & better fuel pump...

i'll keep my eye open for some barging 4 pots

myblackwrx

iTrader: (1)

With the engine ,imo, if it ain't broke don't fix it.

It will do 320bhp easily with fuelling mods have a look here Enduring Solutions Limited for some info on remapping your car with it's standard ecu (sort of).

PolarPerformance is worth a look.

4 pots are about £200-£250 without discs depending on where you get them from.
the 'For Sales' section on here can be quite a goldmine for early impreza owners (i got my exhaust,brakes and ecu of here)

WRX marv

cheers matey i've seen the polar performance stuff but will have a look & talk to enduring solutuions...my engine is broke big ends have gone..got the engine out sunday and going to start stripping it tommorow but can't afford to go mad on it will have to put it back together farley standardish

myblackwrx

iTrader: (1)

polar performance are a dealer for ESL stuff but do a standalone chip (non remappable) it all depends on how far you want to go

WRX marv

at the min as far as i can go on a pocket budget as out of work...but when i find work and it goes bang then going for the whole works,might even go for the 2.5 block

joz8968

iTrader: (13)

WRX marv

cheers mate...don't suppose you have contact details of where your chip is from

joz8968

iTrader: (13)

Hi marv, sent you a PM ...

WRX marv

thanx fella

rodgtt

ok going back to something mentioned in this post...why/do you have to use super on the early wrx imports? i have a late 93 wrx import and been using normal since i had her :-s. fuuuuk - only had her a week but am i ruining the engine and turbo?! oh and is the standard boost 0.7 bar? any help appreciated fellas

joz8968

iTrader: (13)

The WRX Classics, being JDM cars, have their ECU's optimised for Japanese pump fuel, which at the time was, at worst, 100 RON. The best we have is SUL at 97 RON (and Shell's V-Power at 98.6 RON). This means UK fuel has a lower octane rating than the Jap stuff which means that the knock resistance i.e. the resistance to detonation is lower.

If you are holding high boost in a high gear for a sustained period/hot day/etc (so many different variables), then there's a good chance that you'll breach the ECU's IAM maximum ignition retard setting of 0 (out of 0 to 16) - this is as far as the stock ECU can adjust down to to help keep det at bay. If so, this can manifest itself in detonation inside the cylinders (due to an overly lean, hot fuel mixture) i.e. a sudden igniting of the fuel, rather than a controlled even burn.

This is most definitely not good, as the 'explosion' inside the cylinder sends a violent shockwave down through the piston, conrod and ultimately the weakest crank big-end bearings. This can lead to big-end failure or, possibly, holed/melted pistons/valves!

So the minimum you really need to use is 97 RON, but ideally, Shell V-Power at 98.6 RON... PLUS an octane booster such as Millers or Nitrous Formula NF. These typically add 2 full RON to the 98.6 giving circa 100.6 and thus emulating the standard Jap 100 RON brew...


* From memory, the MY93/94 WRX's max. boost is set at 11.47psi = 0.79bar.

rodgtt

you legend thanks yeah. i will fill up tomorrow with that in mind

joz8968

iTrader: (13)

Another well documented tip is not to let the tank go below a quarter full i.e. 15 litres - especially if you throw her around a lot and corner hard (silly question).

myblackwrx

iTrader: (1)

Japanese pump fuel has not always been 100 RON at worst.

91ron -95 ron is/was avaliable in Japan

95ron can be used in Early wrxs but you will not get the most out of it.

You aren't ruining the engine but since there are decent fuels out there use them

joz8968

iTrader: (13)

Hi myblackwrx

Is that really the case? Did Subaru DEFINITELY calibrate the ECU's fuel, ignition and boost maps for the motor to be able to run SAFELY on 95 RON (or even as low as the 91 RON you mention!)?

One reads so much conflicting info on the Jap fuel issue... After all, I've read at least one book on the Impreza Turbo saying that you should NEVER run the engine on anything LESS than 97 RON (if, obviously, you're going to use max or near max boost for reasonable periods).

I'd really like to know 100% for sure, what the deal is?...

myblackwrx

iTrader: (1)

no my point was that you said pump fuel was at worst 100 which it isn't.

I mentioned the other fuels as a simple point for what they the japs get at the pump for other japanese cars not performance ones apologies for the confusion (this may have changed since i was there though)

With the early ecus they can and do retard themselves for 95 ron but as i said you won't get the maximum out of them (unless UK car which is fine but still better to run on better octane fuels).
I used to run my 93wrx on 95 and it was fine but was then informed i wasn't getting the best out of it so changed to the better fuel

97ron is what prodrive recommended as a minimum for their ppp on classics (and who is to disagree with them ).

rodgtt

so just out of curiosity are you guys adding this millers or nitrous nf to the engine as well? going to be buying some today if u recommend...
oh and what oil do you guys suggest...

thanks to everyones input. much appreciated

joz8968

iTrader: (13)

For sure, I fully understand that even if the engine's designed to run on 95, then putting better fuel in, e.g. 97-99 RON, can only ADD to the safeguard of the engine

But what I'm getting at - as this is most important - is that as far as 95 RON (and lesser octane) is concerned, will they definately not harm your engine in anyway? Obviously, if the ECU map has, allegedly, been designed around 95, then det SHOULDN'T occur... But, in actual reality... DOES it?!

[Apologies for the 100 RON untruth, by the way]

hux309

Thing is i believe 100ron wasn't available until 96-97 or thereabouts, but yet mine ran like a pig on anything less than vpower, she wouldn't keep constant boost.

myblackwrx

iTrader: (1)

no need for apologies (i only learnt about it when i was actually in Japan)

If everything is ok with the engine,sensors,coilpacks,plugs etc then det shouldn't ok BUT (there is always a but) my mates bugeye uk spec gets det when the spark plugs are coming to the end of their life and whilst using 95 ron but not when using super ul.

The ecu in the early wrxs easily retard to a point (never had a problem with mine) but in reality i don't think there is a definitive answer because everyones engine can be slightly different therefore be affected differently.

But going back to rodgtt question run it on super (not BP ultimate though),vpower or Tescos 99 ron

myblackwrx

iTrader: (1)

i used to do this for mine and tbh after about 6 months found it to be a waste of time for the state of tune my car was (virtually bog standard) that i wasn't getting anything out of it (apart from being slightly poorer )

My local subaru guys use 10w60 RS fully synthetic iirc.

joz8968

iTrader: (13)

Ha. Yeah, I've read other posters mention bad things about BP Ultimate - 'tiiis veeery straaange