sounds like a typical T7 issue; tunes being too lean from the factory.

how long ago was your MAF replaced?

 

My MAF is about a year old. Should i clean it?

 

octane boost is one solution, but would get mighty costly.

a stage 1 tune that fixed the lean issues would be a more permanent solution. also more fun

 

you could also try running a colder plug. that may take care of it too.

 

I would do two things, run the ngk bcpr 7es-11 plugs and then set up your cooling fan to run all the time and that will help. You could always get a tuned ecu that will control the knock better with a richer a/f, etc.

good luck,

John

 

Thanks guys. Def need that tune as soon as i get some cash will be in contact with u John. In the meantime must i rather not drive it too hard when hot? Can that slight detonation cause a problem. Also i am scared of the bcpr7es plugs cause they seem to keep the boost up whereas the stock platinom plugs seem to cut back on detonation. Thats if the stock boost gauge is anything to go by? When i bent my valves from over revving i had bcpr7es plugs in. Am i just being superstitious?

 

beat you to it john

 

if the new, colder plugs are causing the engine to have less detonation, then more boost is EXACTLY what you should see! it's a good thing.

 

Hi guys, when it is really hot(23 degrees celsius), and i floor my car, i can hear it detonate very slightly for a second or two at the beginning of 2nd and 3rd gear as the boost comes in. ?

lucky! 23C is hot for you!? it isn't weird for us to see 50C here in the summer sometimes...and my car runs fine. If you're getting problems at 23C, you might wanna do a little more digging...i dunno, just a thought.

 

122 degrees? VAGAS?

 

as mentioned change the plugs and maybe try another di as they can play up sometimes.
also try getting your fuel from another garage id been using 99sul for ages but just stuck some 95 unleaded in the other night and it runs just as well need to do an adaption run really though.