Last weekend i reset the ECU to try and solve a problem with the idle dipping and surging. This has improved slightly, but it still dips and surges whenever Im at a standstill.

 

However, from Monday to Thursday, I only ran it on Optimax.

 

The difference in acceleration now is amazing. The boost gauge (aftermarket) says that the car is producing 17 psi of boost. I dont believe this is wholly accurate. :)

 

However, Thursday evening I had to put some standard unleaded in as I was too far from any shell garage. Detonation occured well before max boost was achieved. About 15 PSI on the gauge.

 

So yesterday evening I put in some Super Unleaded. Detonation occured just before max boost.

 

Now, the only engine mods that I am aware of, are the SS Exhaust, K&N Filters (Now vv clean) and the chipped ECU and 0.8mm boost jets fitted by Zedworld. As I have inherited a complete history of the car since it was imported, I believe these to be the only engine mods.

 

Is it normal to det on Super Unleaded? And how much detonation will kill the pistons?

 

edit :- One more thing, it now feels much more powerfull than when I had it on the SE Rolling road. Roll on the next one! ;)

sounds like a vaccum leak to me. I would check the pipework around the boost jet install. If your boost is going too high check the jets are not blocked with anything. There is a tech item on TT net with the correct method of fitting boost jets.

surely this is a good reason for fitting an electronic boost controller.................

 

Vijay

I would be very careful if I were you!

I have fitted boost jets to about 12 Z's and I have never used less than 1mm jets.

0.8mm is going to give just what you are getting - 17 to 18psi!

This is way too high as you shouldn't be going past about 15psi on your setup.

Get them changed to 1mm or bigger. Better still, get a controller.

You certainly need to be using Optimax and take it easy before detonation kills a piston!

 

Chris.