torqueless

[BlueFish5Gt]

I've finally finished with my lump and I did the first 1000 km changed oil filter plugs checked the gasket with a torque wrench.everything was ok and the car was very good on the road and the turbo got in from 2500 rpm.After 2500 rpm it pulled very well and I could feel the torque as the revs climbed.I decided to change the carb plate that has the mixture screw because it was a bit worn and it didn''t idle very well.The plate I changed was even worse so I decided to put the original back in until I found a descent one to replace it.After that it wasn't idling at all and the I decided to change the idling jet as well.It didn't work so i put the old one back in after I cleaned it.After that the car lost all its power and torque and it is much slower that it was.I've changed all the following to find out what is wrong.The carb,the intercooler,the sparkplugs,ecu,I removed the valve that sends cold air form the anti perc fan to the hose that goes from the intercooler to the carb and of course I blocked the hole that was left open,I checked the compression and it is 155 in all 4 cylinders.I am running out of ideas and I need a bit of your help on this.The car is idling fine now and the carb works perfectly but it has lost all its power and torque it feels and sounds like a lathe.

[michael tierney]

u may have left a pipe off or your turbo has seized??

[Scoff]

stupid question, have you checked that you are getting full throttle ? ..and that your choke is switching off all the way ?

[Sparkie]

vernier pulley bolts have slipped and the cam is now retarded loads. - lacks torque, idles crap, but revs well?

[BlueFish5Gt]

vernier pulley bolts have slipped and the cam is now retarded loads. - lacks torque, idles crap, but revs well?

No vernier pulley present.It idles perfectly when it is hot,a bit grumpy when starting cold that is why I wanted to change the carb plate,no torque and the car feels "numb" when reving.I is weird because it all changed when I changed the idle jet.What could possible have gone wrong.My psychology is down the drain.:disagree:

[BlueFish5Gt]

stupid question, have you checked that you are getting full throttle ? ..and that your choke is switching off all the way ?

Yes,I've checked that already no luck.

[BlueFish5Gt]

I've changed all the hoses that go to the carb top just in case these is something wrong with them.Still no sign of improvement.I am looking to borrow a turbo that is ok so I can swap it and see if it's the turbo.I feels like it is loosing pressure from somewhere.This car is driving me crazy.

[tom t]

the actuator rod hasnt come off the wastegate has it? that wouldnt cause it to idle badly so prob not that actually.

[BlueFish5Gt]

Is there a chance the camshaft to loose its timing without a pulley?:confused: I don't think it is possible but I am asking just to get this out of my mind.

[BlueFish5Gt]

the actuator rod hasnt come off the wastegate has it? that wouldnt cause it to idle badly so prob not that actually.

No everything is in place.It is a very tidy engine bay and the car in general is in good condition.

[Jimmy_GTT]

No everything is in place.It is a very tidy engine bay and the car in general is in good condition.

Link here a picture about the engine bay. Maybe we will see something....

[BlueFish5Gt]

One my quest for a solution I went to a dyno for a couple of hours.This is the sheet which is in greek butI'll be here to translate.I am so dissapointed that I feel like recycling it.

[Scoff]

Is that a bad plot ? Looks OK to me. What sort of boost, turbo and cam do you have ?

[Jimmy_GTT]

One my quest for a solution I went to a dyno for a couple of hours.This is the sheet which is in greek butI'll be here to translate.I am so dissapointed that I feel like recycling it.

Have you had it measured before?

Try to pressure test the whole system to figure out if you have a leak.
Do you have a lambda meter? Is the fueling OK?

Post some pictures of your engine bay.

Or at least you have to check the chain, the tensioner and that the cam is on sign.

[BlueFish5Gt]

One my quest for a solution I went to a dyno for a couple of hours.This is the sheet which is in greek butI'll be here to translate.I am so dissapointed that I feel like recycling it.

1,7 bar 23k of torque The turbo is a Turbo dynamics 20/25 ar/48 piper 285 c/r 8:3.

My main problem is that the car after 4000 rpm went crazy and after the jet change it feels like it has no "appetite for reving" or producing the feeling I had with a standard engine and turbo and 1,5 bar boost which I kept for more than 6 years with no problem at all.

The thing that makes me angry is that it all happened out of the blue.I turned if off and everything was ok.When I changed the jet it "got sick" and never recovered.I've swapped carbs,ecu's,i/c's not even a sign of recovery.I have a question about the cam timing.Is it normal to have "half a tooth latency"(sorry for my poor vocabulary) when 1 and 4 cylinder are on tdc? (all marks are in a straight line with a standard cam).

[BlueFish5Gt]

Have you had it measured before?

Try to pressure test the whole system to figure out if you have a leak.
Do you have a lambda meter? Is the fueling OK?

Post some pictures of your engine bay.

Or at least you have to check the chain, the tensioner and that the cam is on sign.

I've changed the whole set and did the timing with all the marks on a straight line when 1 and 4 cylinder were at T.D.C.Before i did that I took the chain cover and saw that it had "half a tooth latency''(don't know the exact translation).Timed it again on the original marks but didn't do nothing.It works and idles perfectly,The A/F ratio starts from 10,5 and goes up to 13,1 at 7000rpm.

[BlueFish5Gt]

Any suggestions?:cry:

[Jimmy_GTT]

Any suggestions?:cry:

What about the pressure?
Do you have the same pressure readings as before?

[BlueFish5Gt]

What about the pressure?
Do you have the same pressure readings as before?

Yes but it doesn''t bother reving and giving that turbo kick it used to.Fells like my grandpa's datsun 120Y.No matter what boost I work with.1.2 to 1.7 makes almost no difference.

My next step is to change the piper cam with a standard to ensure that there is nothing wrong with the camshaft itself.

[steveR5GTT]

post a pic of your engine bay we might be able to see something that your missed?

are you still using the pec fan could be the bulk head valve going to the pec fan? i.e leaking boost?

[Jimmy_GTT]

post a pic of your engine bay we might be able to see something that your missed?

are you still using the pec fan could be the bulk head valve going to the pec fan? i.e leaking boost?

But he has written that he has the same boost readings as before.

Strange. If ha has the boost and the AFR is also OK than it seems like some engine problem to me. Timing for eg.

Have you tried to change the AEI? TDC sensor?

[Jimmy_GTT]

Sound of your engine is OK?

[BlueFish5Gt]

post a pic of your engine bay we might be able to see something that your missed?

are you still using the pec fan could be the bulk head valve going to the pec fan? i.e leaking boost?

I took the hose that goes to the valve and blocked the hole on the main air hose that goes to the carb top to check that too.Made no difference.

[BlueFish5Gt]

But he has written that he has the same boost readings as before.

Strange. If ha has the boost and the AFR is also OK than it seems like some engine problem to me. Timing for eg.

Have you tried to change the AEI? TDC sensor?

I've swapped the AEI and the tdc senson is brand new.I'll change it again just in case.No strange sounds from the engine and the oil pressure is more than perfect.I've reached the conclusion that there is something wrong with timing or I am loosing pressure from somewhere that I can't think of and isn't obvious.

[Jimmy_GTT]

I've swapped the AEI and the tdc senson is brand new.I'll change it again just in case.No strange sounds from the engine and the oil pressure is more than perfect.I've reached the conclusion that there is something wrong with timing or I am loosing pressure from somewhere that I can't think of and isn't obvious.

Do you measure the pressure at the manifold?
Or only the std. place?

[BlueFish5Gt]

Do you measure the pressure at the manifold?
Or only the std. place?

I measure at the standard place.If I had a cracked manifold it wouldn't idle right?

[Sparkie]

i bet the problem magically disappears if you take the cam out and put a standard one in along with a standard vernier pulley.
i still think your vernier pully is to blame.

[Jimmy_GTT]

I measure at the standard place.If I had a cracked manifold it wouldn't idle right?

I'm not sure. But I think you should also measure the pressure at the manifold.

[BlueFish5Gt]

We finally found some time ta lift the lump and check the cam and the timing.I think my glanza neighbour has performed magic on mine.The Timing is out again.The camshaft pulley has one tooth retard(my engineering english sucks).:mad:I am changing the piper for the standard cam for the time being so I can check what's going on.What could cause this to happen?I am not using an adjustable vernier pulley.:confused::mad:.I'hope I'll be done by tomorrow without any more expences coming out so I can buy the wideband from Scoff and start doing some serious job with the fueling.

[BlueFish5Gt]

And some pictures to judge

[Jimmy_GTT]

Check the chain tensioner.
Do you have the GTT one fitted? (I can't tell it by the picture)
Some expert will tell you.

[Mart]

Tensioner looks to be working.

Is it me, or do those marks look lined up ok anyway?

[TrixNFlix]

That looks like one tooth out to me. Old peoples eyes :laugh:

[BlueFish5Gt]

Tensioner looks to be working.

Is it me, or do those marks look lined up ok anyway?

It isn'texactly on the same line that is why I'm asking.

[Mart]

That looks like one tooth out to me. Old peoples eyes :laugh:

In the 2nd picture - If you were to move either mark one tooth out, for sure it wouldn't line up then, but as it is, that's fairly aligned to me.

[BlueFish5Gt]

Well,since I can't find out what is wrong with my car I'll have to settle with the new dials to cheer me up :D.

[Jimmy_GTT]

You can check if the cam is at it's right position.

http://www.gtturbo.org/boards/showthread.php?t=4744

Check if your peak lift is where it has to be.

[TrixNFlix]

In the 2nd picture - If you were to move either mark one tooth out, for sure it wouldn't line up then, but as it is, that's fairly aligned to me.

Ah your probably right Mart, as they probably line up better if in pic three the tdc mark was bang on. Fair play to ya oldie. :agree::laugh:

[Mart]

:p :upyours:

[TrixNFlix]

:p :upyours:

I'll get you one day old man :cry:

[BlueFish5Gt]

UPDATE

After a few weeks I found out that I'd uploaded the wrong dyno sheet.:jerkoff:That was from a friend's raider.
These are correct ones.

[Jimmy_GTT]

Do you mean there is no problem with your car?
Your friends raider has to be repaired? :D

[Mart]

:scratch: :D

Looks like either the float's emptying and/or fuel pump's running out of puff.

[BlueFish5Gt]

The mystery has been solved.After going on fifth gear and 3500 rpm on the highway my brother who was driving the car started to hear the usual conrod banging sound.:bothered:.After two gt's and at least 20.000 euros spent I believe this is the end of the game for me.:sad2: