hi everyone, I only way I can describe this is when on boost at about 3000/4000 revs accelerating, there sound to be (now and agian) a rattle coming from the passenger side turbo or around there, does any one know what this could be?

 

 

cheers

 

 

JIM.

Errr, detonation?

What does the rattling sound like? .. does it sound like stones being shaken in a tin box?

 

Do you have a boost controller? If you are running high boost with the contoller then even if detting is detected via the knock sensor I don't think that the car will go into safety boost as it would be overidden by the boost controller.

 

You could try turning the boost controller off completely and driving the car as per stock boost to see if it then goes into safety boost.

 

I guess it could be detonation but I guess it could be quite a few things.

with any luck thats detonation, as when my turbo fell to bits back in the summer the rattling could be heard all the time, at idle and got consistently worse as you revved it.

 

good luck any ways mate! hope it aint tubs. keep a close eye on it though as i first noticed a slight noise and no smoke and then all of a sudden it went and i think i was lucky not to get any piston damage from the bit of turbo that broke off.

hi lads thanks for the replies, I am running standard everything but ive ahd some trouble with the code 34 for about 6 months now I tested the det sensor and it was reading low on the sensor side, so i bypassed it with a resister and I got no code! so it must be the det sensor, because when i connect it back up i get the code agian! it has been ok with no codes and bypassed up to now.

 

do you all think im actually detting? and if so why is this, its a jap import tt running on optimax all the time?

 

 

 

cheers

 

 

jim.

It is possible. Detonation sounds like a loud rattle.

 

Stuart

hmmm, dunno mate. mines a jap and it runs fine when on optimax but anything else and i go into safety boost.

 

something to do with the timing? i have no clue really. sorry mate

I am not sure either TBH There are a lot of people on here that have an extensive amount of knowledge and I am sure they could help you better.

 

Maybe your ignition timing is too far advanced?

if the timing is to far advanced, (it's never been moved) would this cause the slight tappet rattle when foot is pressed on the pedal slightly (bliping the throttle) and I also have hesitation from standing start?

 

 

any help greatly appriciated!

 

 

 

Jim

almost deffinatly detonation i'd say

I dont think it would cause the tapping... I think im having the same problem as you as ive had to do the Resistor thing too and i can hear like a flapping/rattling noise under boost. Which way would you turn the CAS to decrease the timing if its too far advanced? im guessing anti-clockwise. Considering this -

 

 

http://www.angelfire.com/geek/vg30d...etSenRel01.html

ok thats just freaky the link wont work! check out the det sensor relocation in this post -

 

http://www.300zx.co.uk/forums/showthread.php?s=&threadid=19693&highlight=det+sensor+relocation

hi ive just reconnected the det sensor and I still get the rattle and the car feels real heavy to pull? Im considering adjusting my timing also, but are a little unsure about it!

 

it's a strange one it does'nt sound like it's detting?, but I don't want to fry a piston.

 

 

 

 

Jim

sounds like the car is now in safty boost, all i would say from the sounds of it your getting detonation and to be very careful because i'm sure you dont want a broken piston or ring etc!!

 

Kirbz

Aircon compressor? Try removing the belt...

aircon compressor why's that mate?

That could be what the noise is - not the boost...