Snotboy!

I own a 97 Uk 2000 Impreza and was just wondering if anyone would know what kind of power its pushing out.
It has a HKS downpipe and centre section with a H+S backbox,HKS induction and a blitz dumpvalve.

Im also thinking about fitting a Dawes device and would like to know how much power i could gain.
Cheers

Type_RA

208 standard maybe 30-35bhp for the zorst

alcazar

iTrader: (2)

As it is, about 240bhp. an induction kit is NOT recommended with Imprezas unless you have an ECU which doesn't make use of the MAF sensor, eg: LINK.

Also, VTA dumpvalves are a bit of a no-no.

Dawes? Dunno, but someone will be along soon to say.

Alcazar

hades

Maybe ~265ish if running well on Power Engineering's rollers with the Dawes fitted and set up to the right sort of boost level. Somewhat less at one or two other rolling roads - e.g perhaps 240-245 at powerstation.

Snotboy!

Ive only had the car about 2 months and didnt fit the mods myself.I dunno if its a full induction.Its quite a big silver cone filter,is this an induction kit?And why is it a big no no?

Also why are dumpvalves a no no as they improve throttle response?

Could someone also explain the MAF etc to me as im a newey and dont really know too much yet?

Greeny01

Mass Air Flow Sensor. Controls the fuelling (air to fuel ratio) to the injectiors. Well thats the way I understand it anyway.

Iain

MarksWRX

wot makes you think a VTA dumpvalve will improve throttle response?

hades

MAF sensor - measures the amount of air going into the engine. If it fails the car will think less air is going in, and so run lean, often causing detonation (premature ignition). Pistons / big end etc can fail leading to full engine rebuild. Some induction kits seem to increase the chance of MAF failure, possibly due to increased vibration, oil contamination. A lot of people have had this, although plenty haven't. Some cars are particularly prone (98-99 ish I think), some get MAF failure even with no induction kit, but it seems to increase the risk. Big silver cone filter = induction kit, yes.

Dependent on viewpoint, some people worry about VTA dump valves causing the opposite - let all the air out (a normal re-circ dumpvalve keeps it in the induction system), engine puts in much too much fuel, could cause "bore wash" - washing oil off inside of cylinders. IMHO, not a great deal of evidence to suggest this causes problems in most cases.

MarksWRX

do you mean pre-ignition or do you have a sexual problem
and just to be picky detonation is different to pre-ignition, sorry

hades

OK - "just to be picky":
Premature - something that happens earlier than intended
Ignition - the commencement of rapid oxidation of a comubstable mixture
Detonation - roughly speaking, amplified pressure waves causing localised explosions. Those localised explosions are areas that have detonated (i.e. ignited) before the flame front has arrived (i.e. prematurely).
Pre-ignition - something only mentioned by MarksWRX
Premature ignition - Not in any way referring to normal sexual practice, but the word premature may spark off adolescent humour.

"Sorry"

Was trying to not go into unecessary detail.

Snotboy!

MarksWRXwot makes you think a VTA dumpvalve will improve throttle response?

I was told by someone that if you fit a better dumpvalve,your throttle response improves when changing gear.And why would these companies spend thousands of pounds on designing a good aftermarket dumpvalve specially for an Impreza if theyre no good?

So would i be best off getting rid of my cone filter and putting a standard one back on?

Cheers

trails

iTrader: (41)

Yep ditch the induction kit, slap the std air box back on woth an after market panel filter (Green, sti, K&N), and bin the silly VTA. (Some) people like the noise it makes (?), if you want more noise from turbo\BOV than remove the induction baffle in your inner wing.

automodellistagt

i have to admit im taking my bailey item of my impreza cos it is running way too rich (myo4 sti ppp) to see if make s a diffenrece

Snotboy!

How much am i looking at for a standard airbox and green panel filter?