Decat Idle ? And Intercooler Upgrade ?

[adamh]

Hi all,

I Decatted my car the other day and i'm wondering is it normal for them to idle at 1500 rpm when you first start them ? (only does it for a minute or until i blip the throttle ) It's only started doing it after i fitted the decat.

Also is there any upgraded top mount intercoolers for a v1 uk wagon ( the slanty type )

I tried a search but could only see them for the newer classics.

P.s I'm new to subaru ownership

Cheers

[RA Dunk]

Hi all,

I Decatted my car the other day and i'm wondering is it normal for them to idle at 1500 rpm when you first start them ? (only does it for a minute or until i blip the throttle ) It's only started doing it after i fitted the decat.

Also is there any upgraded top mount intercoolers for a v1 uk wagon ( the slanty type )

I tried a search but could only see them for the newer classics.

P.s I'm new to subaru ownership

Cheers

Nope to the first question, When i did mine it ran as normal, 1500 RPM is a little lot too high, Dont ask me whats wrong im no techy expert lol

Top mounts from newages can be fitted but its not an easy task, but a worth while one over the slanty type interboiler

[sti pretender]

Hi and welcome to the forum.

Sound like the decat has caused the change, with the exhaust flowing more freely the pressures have changed, well thats what I was told when I decatted my classic.

Are you planning on getting it map? If you want more power and better delivery a map with even miner mods make a big difference.

Robert

[adamh]

Hmmm i'll have to investigate fitting a new age top mount.

Yeah i will be getting it mapped at some point i want to get the basic stuff fitted first i.e better intercooler,induction kit etc ..................... Brakes are a definite priority the now

It's got a polar performance chip fitted which hopefully should keep me entertained until i get a proper remap.

Thanks

[RA Dunk]

Hmmm i'll have to investigate fitting a new age top mount.

Yeah i will be getting it mapped at some point i want to get the basic stuff fitted first i.e better intercooler,induction kit etc ..................... Brakes are a definite priority the now

It's got a polar performance chip fitted which hopefully should keep me entertained until i get a proper remap.

Thanks

Think its easier to fit a front mount rather than a new age top mount, both are about the same price as well, as for brakes i take it you have the OE two pots up front? deffo worth changing them out lol

[Joe G]

Stick with the original air box with a k&n panel filter unless you need to change it out for an induction kit (ie fitting a front mount)

[adamh]

Think its easier to fit a front mount rather than a new age top mount, both are about the same price as well, as for brakes i take it you have the OE two pots up front? deffo worth changing them out lol

Lol 4 pots are for winners

I take it i'd need to cut a hole in the inner wing to fit a frount mount ? I'm no to fussed if i need to remove the AC as thats getting junked anyways

[adamh]

Stick with the original air box with a k&n panel filter unless you need to change it out for an induction kit (ie fitting a front mount)

It's running a drilled airbox (i.e buchered with a grinder ) and an HKS panel filter just now

Cheers

[RA Dunk]

Lol 4 pots are for winners

I take it i'd need to cut a hole in the inner wing to fit a frount mount ? I'm no to fussed if i need to remove the AC as thats getting junked anyways

Nope no holes need to be cut in wing, the pipework will fit through the existing holes already there, it might require a wee trim on the inside of your bumper but its nothing major TBH, A/C can stay as well the FM dosent interfere with it at all, ive just ditched mine though but only cause its a dead weight and never used, Hybrid GTII ones from Harvey on scoobynet are very well priced

Brakes either AP or Brembo seem to be the most popular choice but with the AP name comes a heavy price tag

[adamh]

Nope no holes need to be cut in wing, the pipework will fit through the existing holes already there, it might require a wee trim on the inside of your bumper but its nothing major TBH, A/C can stay as well the FM dosent interfere with it at all, ive just ditched mine though but only cause its a dead weight and never used, Hybrid GTII ones from Harvey on scoobynet are very well priced

Brakes either AP or Brembo seem to be the most popular choice but with the AP name comes a heavy price tag

Would calipers off a newer subaru be any good to me (the ones that have subaru on them ) I'm assuming there 4 pots

They front mounts on scoobynet look decent cheers for pointing me in that direction

[Joe G]

It's running a drilled airbox (i.e buchered with a grinder ) and an HKS panel filter just now

Cheers

Will be letting hot air into the intake if its been butchered and drilled. A drilled box will only make more noise and you will prob be losing power if anything.

[adamh]

Will be letting hot air into the intake if its been butchered and drilled. A drilled box will only make more noise and you will prob be losing power if anything.

I tried to minimise heatsoak by only cutting the part that faces the front of the car the rest is still sealed .................................... it does sound good tho

[Big 'D']

Going back to your first question 1500rpm idle from cold is perfectly normal so long as the idle gradually comes down as the temp increases and then idles roughly about 850rpm when up to temp.

Cheers Iain

[RA Dunk]

Cant say ive ever seen any of mine ideling as high as that on a cold start Ian

[Big 'D']

Cant say ive ever seen any of mine ideling as high as that on a cold start Ian

All 3 of my scoobs have always started with a cold idle speed of 1500rpm so I assumed it to be normal.

Cheers Iain

[adamh]

Going back to your first question 1500rpm idle from cold is perfectly normal so long as the idle gradually comes down as the temp increases and then idles roughly about 850rpm when up to temp.

Cheers Iain

Thats what it does. Thanks

[RA Dunk]

All 3 of my scoobs have always started with a cold idle speed of 1500rpm so I assumed it to be normal.

Cheers Iain

lol its maybe been mine being un-normal then

[Big 'D']

Obviously all our scoobs are going to be modded and setup different but just to see if I was going mad I went out this morning and took pics of the dash in both my 01 Fozzy and my 97 Sti, they are both full decat etc yet they both have roughly the same idle speed.

Pics were taken within 15 secs of turning the key.

V3 WRX Sti

MY01 Fozzy S-Turbo

Cheers Iain

[Connor_scotland]

I decatted my car last Saturday and when i start it for first time it sits at 1500rpm aswell mate.

[thefastone]

Its just what used to be the "choke" it just revs a little higher to warm the engine up, like an auto-choke if you like. most if not all fuel injected cars and motorbikes should do it really... you probably just haven't noticed...

In fact my bike used to rev a good bit higher for the first few minutes when you started it up...

[dan_jess]

4pots in the for sale section

[colin_ross]

Going back to the idle question - it will be the cold start function that has raised the revs not the decat, although you may hear it more.

The cars run a maf as standard so even if the car is now breathing more freely it will make sure the desired airflow is maintained by adjusting the idle control valve. Once up to temp it will back it off as normal.