runnin though... whew good thing..

question: i know that 0 knock is the best.. i have heard that our motors run a ton of knock all the time? didn't think that was trueif everythings runnin right... Is it?

Scanned my car after figuring out what the overboost problem was and due to the fact that i can't step on the gas more than 60% i was seeing 19 degrees at 15lbs ruffly... OUCH!! no more boost for me till i get my turbo ported.. thats 4 sure!

question, i have heard that we can't or shouldn't run more than 14lbs with stock fuel system... on the scan i was at 90% throttle, and at 16 pounds with 0-1* of knock.. that would tell me that if i could floor it, and put even more gas inner that i should be seeing 0* at 16lbs on my stock fuel system... so is there anything wrong with runnin that if i have 0* of knock??

thanks guys :thumbsup:

You will be running pretty lean... Then hit fuel cut :P

i thought that if you were running lean you would create knock?

Are you on the stock t25 turbo? or a bigger one? bc a bigger one would make it run more lean. The t25 will fall on its face at 16 psi and you'd prolly start to run real rich then

your going to catch knock if you floor it, like he stated your going to get fuel cut and your going to be running lean slightly im not saying to much knock but your going to get prob 5 counts at 16lbs on stock fuel system your car will be scared lol.

sorry guys... i left this out... i was scanning with evoscan and at 16lbs at 92%throttly i had 0-1* of knock...

I thought that lean conditions would creat knock, so if there's knock you are lean..
no knock.. not lean...

Can someone explain if i am wrong, or verify I am right?!?!?!? Thanks :thumbsup:

We need to know what turbo you have. Again, it all depends on how your turbo will act at 16 lbs...

Its its a good solid td05 like a 16g or so, you're gonna keep pulling away and lean out.

If its your stocker t25.... you shouldn't be pushing 16 psi anyhow :P

Hey military.. I have the evo316g... just got done pullin it off with my brother...
only took us 4 hours in the driveway with the improper tools.... lol!

Anyway, ya.. thats the one.. i am porting the exhaust side of it to deal with the overboostin problem i have... :grin:

Porting your turbine housing won't fix your overboosting prob... sorry.

You need to upgrade your fuel system. What are you using to tune it?

Heres the deal. At 90% throttle, and at 16 lbs of boost on an evo iii, you are shoving more air than your fuel system can handle. Tho you are getting 0 to no knock (this is because you forcing the "right" amount of air to compensate for your engine") your fuel system is falling on its face. So fuel upgrades should be your first deal.

Second, you need to get a wideband o2 so you can get an accurate A/F reading. This will tell you just how lean you are running (lean = more knock, more stress on your engine, and more heat in your engine). You should not go much higher than 12 or 13 on the stoich scale unless you have upgraded internals.

If it turns out you are running relatively rich... maybe you just kept a really clean fuel system... or maybe you have a boost leak. But logic here would tell us that you are running lean (which disagrees with your knock reading at 90% throttle, but agrees with your reading at 60%).

Here's what bothers me.



19 deg of knock is waaaay too much and you are risking a predetonation (ie, bye bye motor). TURN THE BOOST DOWN. Get more fuel in there, then turn the boost back up. You will see significant less knock, and a much richer and more powerful A/F (assuming you tune it correctly).

thats just it... i cant turn the boost down... it is down all the way.. please before making already made recomendations look under the performance section of the forums and check out my post on overboosting... You will find that with my turbo you do need to port it.... that is the only way that i can run low boost numbers on it...This has nothing to do with tuning... it has to do with other upgrades and issues that i have fixed aka taken care of.. :thumbsup:

I really thank you for all your help and recomendations over the past couple months... you know ALOT of stuff man.... :beer:

:P
I have little to no intentions of hooking up a 16g and it makes sense that porting could run lower numbers so ill take your word on it. Do you have an MBC or some fancy electronic one?

Lol.... i had a fancy electronic one.. but sold it and bought a manual...
The exhaust side of the evo3 cannot flow enough exhaust through the wastegate when its stock.. therefore it flows to much through the turbine running to much boost creating more heat running more boost.. etc....

you can get knock from bad gas

Please tell me you've been running the highest octance gas you can while doing this... haaha otherwise i think i know why you are hitting 19 deg of knock... 87 gas would add to that.

LOL... that would be bad... What kind of moron wouldn't run premium in any car... except when stated to run lower... lol..

Well really you don't have to run premium on a gas saver. Premium is for those who are trying to get performance out of their car.

Or those who want to run a better cleaner gas that pays for itself in additional milage.. :thumbsup:

you can get knock from too much timing as well

I know this should be a different thread but, how do you pull apart the turbo... i have mine out and took off the clamp, but it seems there is more to it than that...?