High Knock After Service

[Get EPIC]

Hey guys.I had my R33 with power fc and basic mods tuned about 25000klms ago.Everything was fine for this time.I had my 100000km service done last week and ever since i get pretty high knock reading on both normal driving and when i give it a bootfull.The engine feels and sounds better than it ever has before.When giving it a bootfull it will read between 70 and 100 on the knock reading every time and when driving around normal i will get readings of up to 50.Can any one enlighten me as to what may be wrong please.This car is my daily and i have to travel about 90kms a day so i dont want to damage it!

[tridentt150v]

You'll lunch it if you don't baby it, need to get it back to the shop and get it re tuned. Anything over 60 is a worry, and 100+ is piston melting time.

Could be something simple like a fuel pump on the way out?

[JonnoHR31]

did they set the timing for you in the service. could have been slightly retarded when originally tuned

[Get EPIC]

You'll lunch it if you don't baby it, need to get it back to the shop and get it re tuned. Anything over 60 is a worry, and 100+ is piston melting time.

Could be something simple like a fuel pump on the way out?

Can't really afford to lunch it.Fuel pump is a walbro 6 months old

[2LV8ETR]

read between 70 and 100 on the knock reading

[Get EPIC]

did they set the timing for you in the service. could have been slightly retarded when originally tuned

Don't know mate.I rang the workshop and he called my tuner Matt Spry who said to bring it down it wont take long to fix but when i called him to make a time he was pretty busy and didnt know when he could fit me in

[im late]

Please drive like miss daisy till the tune/timing is sorted............................

[Get EPIC]

Is there some way to retard the timing on the hand controller until i can get it looked at?

[Get EPIC]

Please drive like miss daisy till the tune/timing is sorted............................

I'll do my best mate.I'm pretty worried about it.I didn't know this could happen after a timing belt change

[tridentt150v]

Yes, you can use the hand controller to knock 3 degrees out of the timing - blanket - across the board. Have a look at Pauls PFC instructions in the DIY section

[89CAL]

yeah as above probably the best idea.... play around for a bit knocking 1 degree of timing out of it till the knock goes down. Add some fuel as well if you want to be extra safe

[wanted r34gtr]

I didn't know that changing the timing belt could affect the timing. Does anyone know the truth ?

I'll do my best mate.I'm pretty worried about it.I didn't know this could happen after a timing belt change

[Jetwreck]

I'll do my best mate.I'm pretty worried about it.I didn't know this could happen after a timing belt change

let it blow!!!....then maybe you can stick a 2lt S20 in it!!!!....take it closer to the original GTR....know what I mean???

Edited September 16, 2009 by Jetwreck

[STATUS]

I didn't know that changing the timing belt could affect the timing. Does anyone know the truth ?

yep it will, as the cas gets removed. I'd say it was either not set after re-assembly, or the most likely case is the base idle was set wrong before it was tuned (say 10degrees) and after they serviced it they set it properley to 20 and it now has 10 degrees more base in it.

Edited September 16, 2009 by URAS

[Get EPIC]

yep it will, as the cas gets removed. I'd say it was either not set after re-assembly, or the most likely case is the base idle was set wrong before it was tuned (say 10degrees) and after they serviced it they set it properley to 20 and it now has 10 degrees more base in it.

thanks Trent,

[Get EPIC]

let it blow!!!....then maybe you can stick a 2lt S20 in it!!!!....take it closer to the original GTR....know what I mean???

Funny

[KiwiRS4T]

If the person changing your cam belt marked the cas and put it back in exactly the same position your timing will still be out bacasue of the new belt. 'Tell your tuner that your cambelt has been changed and you probably just need 5min of his time to check the base timing - not a 2 hour tune, and he should be able to fit you in (if not get another tuner).

[Granthem]

I took a R33 for a test drive, managed to hit 116 knock lol. GO me!

[Johnny]

I know it might be what trent said with the cas but has anyone thought about the mechanic taking the car for a testdrive; thrashing it for an hour n filling the tank back up with regular 91 octane fuel? thats why its knocking so bad.

plausible as if u only had quarter tank n he used most of it, refilled with 91octane and cos ur car is tuned for 98, its knocking.

jst a thought!

[Zardos]

I took a R33 for a test drive, managed to hit 116 knock lol. GO me!

You are crazy mate, you really need to stop driving it like that.