Flat 4x4

I get this sometimes if revved hard and changed quickly from 2nd to 3rd. Is it back pressure or what ? Goes well and just serviced - is this just a characteristic ?

chrisp

sounds like the diff to me but I am probably wrong. I think this thread is heading towards drivetrain forum .

chiark

They all do that sir.

I found it got better with a K&N induction kit + practice.

fastphil

Only had mine 5 months (my00), and it does the same, hope t is just a characteristic.

Yorkie

Sounds unusual to me

When I had it my MY99 only used to occasionally jerk (sudden hesitation) after changing up after 6000 rpm + from 2nd to 3rd.
Sounds a bit like transmission to me but I could be wrong.

Yorkie

AlanG

See here also.. http://www.scoobynet.co.uk/bbs/thread.asp?ThreadID=93903



[Edited by AlanG - 5/7/2002 8:01:58 PM]

grahamstocker

Get this sometimes aswell try not to be so brutal when dropping the clutch on gearchanges

boomer

Could it be the clutch plate sticking slightly on the splines, so that one surface grips fractionally before the other at which point full power is delivered with a slight thud?

I noticed a similar thing on my MY00, especially when cold, along with the dreaded clutch judder - another feature.

No such problems yet on my MY01 though!

mb

RichS

Mine does this - exactly as per your description.

I think it's pretty normal, as I've noticed it in other Imprezas I've had track day passenger laps in...

Rich

logiclee

Mine dit it also.

Diablo

Yup, they all do it.

Its just the slack in the drivetrain being taken up.

You'll soon learn to drive around it.

D

Flat 4x4

Thanks - mind now at rest. I think the Legacy Turbo I had 5 years ago did the same, come to think of it.

my2009

My MY00 Sport and MY02 WRX both have the "thud" when changing gears and lifting the clutch fast ( quite often

I always thought that it's the back diff engaging... Anyway, it's nothing to worry about. Just tells you that the traction is there

RON

Try driving more PROgressively, and not so AGGressively.
Helps for me, you don't get anywhere by being brutal with it, so don't be!
Ron.

my2009

**********
Try driving more PROgressively, and not so AGGressively.
Helps for me, you don't get anywhere by being brutal with it, so don't be!
Ron.
**********

Right, just that the going feels .1 secs faster when dumping the clutch

JonW

Nah this is the overboost problem. clean out your pipes with barke cleaner and it'll subside a bit, or drive round it, or change your ECU for a 801 / Ecutek...

JonW

Flat 4x4

JonW

Can you tell me what the overboost problem is / or where I can read about it ?

mutant_matt

Jon,

No it's not m8 - I'm not certain if it's diff wind up or not as it feels more like a fuel stutter to me but it certainly isn't overboost

Matt

my2009

Not overboost for sure! (Unless someone installed a turbo to my sport

I have the "thud" on both my sport _and_ wrx so...

Diablo

FFs, you post the answer and nobody believes you

DJB

Agree with Diablo. Definitely drivetrain shunt.

D.

Flat 4x4

I believe you... although it does feel 'pressure related' as though the ECU reins things in for a split second.

chiark

<consoles diablo>

I believe you.

JonW

Whilst i believe Diablo, how can you get shunt when the drive has everything all lined up and you shift quickly which should keep things all lined up wheras shifting slowly doesnt do it? You'd have to agree the longer you leave it the more outa linethe drivetrain would be...

I was told by numerous people this is overboost and once id cleaned up the pipes it was much reduced, go figure??? :-)

JonW.

C h a z

I noticed this when I first got my Scoob. However, with the passsage of time it seemed to disappear. Until I got new tyres, super grippy ones, then it returned. So drivetrain it is I recon.