Engine Knocking Any Suggestions??

[flossinsince1986]

Ok well I'm pretty new to all this and Im trying to find some help for my engine knocking..I know that toyota recommends not exceeding psi of 8 pounds running through the turbo at constant rates on the stock engine..And I know they are right because I often run around 11 -15 psi and usually get engine knocking after constant pressures at this level...So basically Ill Im trying to figure out is if this is a common problem with the 1989 Toyota Supra Mk3 turbo? Can anyone suggest what may be my problem? What can I do to help this problem? Thanks! -Thomas

 

[whenmunkysfly]

ummm...swap motors or time for an engine rebuild. if you go this route put performance in so you never have to take the motor apart again (well hopefully) oh and keep a close eye on your oil level

 

[joey_daze]

are you running 15psi on a stock engine?

 

[Nick M]

What does the knocking sound like.

 

[flossinsince1986]

Yakima huh? Good apples.

Do you mean it's detonating or knocking mechanically? Is your knock sensor system working? Got any codes? Timing correct? Good fuel? Enough of it flowing? Mods? Cooling system OK? The same stuff that makes any car knock makes the Supra knock.

I really dont know that much about this area but im pretty sure it is detonating..only when I run boosts over 8 psi for a long period of time though..and I know the manual says to avoid this for that very reason but I want to figure out if there is anything I can do besides obviously rebuilding the engine..could i be running a little lean?? I run synthetic oil with premium gas always and the engine is in overall great shape

 

[flossinsince1986]

are you running 15psi on a stock engine?

Well i know its well over 8 becuase the gauge only goes to 8 and even with the boost controller set on the very lowest setting for high boost it still goes well over the 8 mark, so i know its around 10-15 psi and yes on almost stock engine, has kn intake system with bigger downpipe and bigger exhaust with new pulleys and some other minor upgrades.

 

[koulee]

Well i know its well over 8 becuase the gauge only goes to 8 and even with the boost controller set on the very lowest setting for high boost it still goes well over the 8 mark, so i know its around 10-15 psi and yes on almost stock engine, has kn intake system with bigger downpipe and bigger exhaust with new pulleys and some other minor upgrades.

The next thing you will hear is KABOOM!.

 

[jetjock]

So you increased the VE of the engine with better intake and exhaust, then further increased it by doubling the boost from stock (sorta, you don't even know what it is), then run that boost for extended periods of time, all without any fuel upgrades? Carry on, it'll be fine

 

[flossinsince1986]

So you increased the VE of the engine with better intake and exhaust, then further increased it by doubling the boost from stock (sorta, you don't even know what it is), then run that boost for extended periods of time, all without any fuel upgrades? Carry on, it'll be fine

Jetstock, im not so sure it doesnt have any fuel upgrades becuase when i bought it the previous owner did all the prior upgrading and im dont remember everything he said that he had done...what do you think i should do first to upgrade fuel? If i bought bigger injectors would i have to buy any other parts to make it compatiable???

 

[supra90turbo]

Remove the boost controller till you've a better grasp on what's what in the 7M. If you don't know if it's stock or upgraded, find out what a stock one looks like.
Intake/exh won't hurt a car, but boosting to idunnopsi is too much for someone who doesn't know their way around a MK3.

 

[flossinsince1986]

Remove the boost controller till you've a better grasp on what's what in the 7M. If you don't know if it's stock or upgraded, find out what a stock one looks like.
Intake/exh won't hurt a car, but boosting to idunnopsi is too much for someone who doesn't know their way around a MK3.

well your def right but im not about to go through the trouble of disconnecting the controllers when i can just simply turn them off...