sc00bylee

Ive got a 97 uk classic running 1.5bar of boost with all the supporting mods, fitted an exedy organic clutch which seems very juddery, the problem im having is it will now only boost to 1.3 bar in gears 1-3 but will hit 1.5bar in 4th. After needlessly checking plug gaps etc and scratching my head i decided to check the return spring ( on top of the gearbox ) this seemed ok, so there i am pushing the lever back and fourth and swearing away to myself. Anyway, took it for a spin and the clutch was totaly different, no judder? 1.5bar was back in all gears........ 10 mins later and it was back to normal, 1.3 bar in gears 1- 3 and a judder from the clutch.
Anyone got any ideas because this is doing my head in now

By the way, the flywheel was scimmed.

RSWilson

I don't know enough about these cars to offer much of a reply however it was the first thing that went through my head when I read your post.

If the battery was disconnected for 30 min's of more I'm told the computer will forget all the fuel running settings. As such it has to learn it all again.

This can take a little time as it works out the knock that the can withstand (the octain rate) etc.. this can cause the boost to run low as the engine learns and adjusts to find its optimum setting.

Give it a 500 miles to get back in sync and use 97ron unleaded. That should take the shine of the clutch and iron out the problems.

Good Luck
Richard

sc00bylee

cheers for taking the time to reply Richard, to be honest i cant see it being that as im using an Apexi FC ECU, its got to be something simple...just cant think what.

Lee

scoobertron

this is correct i fitted new clutch,plugs cambelt obviously disconecting the battery because of the starter motor and mine was the same it just needs a few miles of driving for the ecu to relearn

sc00bylee

still dont agree guys, after playing about with the clutch lever (on the box) it goes back to full boost for 10 mins or so then the judder reapears and the boost drops.

RSWilson

It sounds like two different issues.

The clutch needs time to bed in to the flywheel - know know what its like when you fit new brakes, there are hard as hell till they bed in.

I read the bit about the computer needing time to adjust to the fuel again.
Basically in the uk regular unleaded is 95ron and super is 97ron (use to be 98ron).

The car needs time to learn and adjust to the "fuel knock" (the state at which fuel will combust under its own compression). 97ron can be pushed more then 95ron for example.

Your car is learning how late it can fire the plug before the engine combusts the fuel itself. Basically it will leave it later and later till your computer senses knock.

If you use 95ron it will back-peddle further. If you then use 97ron again it will take time to re-learn how late it can leave it.

Just take the clutch steady so's not to harden it to early then give the computer time to learn.

Cheers
Richard

Jolly Green Monster

iTrader: (4)

is the clutch fork pivot pin cover on?

One time when I fitted me engine I put it together quick and test drove it to check something and just slung the start on.. the clutch pivot slowly worked lose and popped out a bit causing similar judder to you mention..

Also worth peering through the inspection cover to check the fork is correctly engaged.. although I would expect it to be engaged or not rather than wrong.

Simon

scoobertron

what sort of clutch is it . if a paddle then there juddery any way as i have a six paddle and that is juddery cant see it being the clutch to be honest

sc00bylee

Exedy organic clutch, car is running around 330hp (or was when i could hit full boost)
just cant get my head around it, it feels sort of like a missfire, thats why i checked the plugs etc first. Strange how it will hit full boost in fourth, but wont in gears 1-3.

sc00bylee

Anyone??

Jolly Green Monster

iTrader: (4)

Any luck checking the pivot pin cover?

sc00bylee

going to check that tonight simon, i take it you mean the removable rubber cap, what should i be looking for???

hope i dont sound too stupid

Jolly Green Monster

iTrader: (4)

no the screw in cap the one that needs a 10mm allen key to undo / do up.

You need to remove the starter to fit / remove it.

Did you fit the clutch yourself? if not take it back.

Simon

sc00bylee

me and a mate fitted it over a couple of days, this was a few weeks ago now, been taking it easy with it trying to bed it in so didnt notice the problem until now, like i said, thought it was a missfire at first.

strange how it clears (for a while ) after pushing the lever back and forth.

so do you think its not disengaging correctly?

will get the starter of tonight