Potholes, you are not going to hear knock. If you do, then it's so bad that it may already be too late. Knock is very common and undetectable by the ear. In your situation, it was wise to tow the car with 87, then it was fine to put in a 3:1 ratio of 93 at least to get the octane at a more suitable level, although I personally would have put in 3-4 gallons of some 100+ octane in order to bring the total octane well above 90. Even so, you were probably fine for that short duration before the next fillup.

 

I hope the rest of you can ignore Varrius and realize that his vendetta is misplaced. I will not respond to him, but I will continue to try to help in this thread. I hope it's obvious that he has no idea what he's talking about. If it's not, then please PM me for clarification. Hopefully, the mods will take care of him once and for all, since this is not the first...nor second...nor third time he's done this...

 

ok this is what im dumb at... does the old gas stay on the buttom of the tank? or does it mix with the new gas that i pumped in it?

 

I dont mean to jump in the middle of this, but Varrius is not out of line at all.. People are going to have conflicting opinions on everything. No one on this site is 100% correct on trying to solve a problem with out seeing it..

 

Varrius,
I have talked to you about this before, I guess you forgot.
See you in 5 days.

 

I'm glad you're a bit more open minded.

 

It mixes, but exactly how and to what degree is unknown. Generally, though, when you mix octanes, you just do a basic average of the octane rating and # of gallons. For instance, your 2gal of 87 + 6gal of 93 would average to 91.5 octane.

 

thanx man, i guess i'll live, im still a lil paranoid tho. would a compression test help? for a peace of mind lol don't mind me im have lil OCD about my car.

 

must feel good to be a mod...

 

Thats a very ignorant thing to say quite honestly. The videos and magazines are professional publications. I'm sure some are biased or swayed by certain companies but they are still a resource. I totally agreed with your statement about the cars being tuned differently in Japan but its starting to look like all you want to do is appear more important in your posts then you really are.

-Joe

 

Well, it can't hurt to do one, and you can easily do it yourself by getting a $10 compression tester at Autozone. I think you would know by now if you had blown the motor, but sometimes it's not obvious. Go check it or have someone check it so that you have peace of mind.

H.funk, the personal insults and off-topic posts were removed for obvious reasons.

 

thanx

 

Does the ECU add more boost to acumulate the 20 (or w/e the evo IX runs) psi? I was asking about putting the MBC at maxium "-" because I was under the impression that it would just let me run what the stock evo runs PSI wise and not wastegate since we were talking about adding a TBE would "add" more boost. What would the boost controller have to be at to run stock psi?

How does any MBC or what not boost me up then 9psi, they usually chug out around 5psi?

 

A TBE does not "add" more boost the way you're thinking. With an internal wastegate backpressure is calculated into things. when you free up the exhaust there is less backpressure so the wastegate has less pressure on it ~ more boost.

you also don't want to set a manual boost controller to max because when you hook a MBC up you are disconnecting the stock control solenoid that lets the ecu control how much boost the car runs.

 

LostSol, you two both points. He didn't ask if the TBE adds more boost - he said the ECU. He also didn't say he was going to set the MBC to max - he said min or "-". You were right about the BCS, though.

SavEVOIX, no, the ECU doesn't "add" boost. It controls boost via the Boost Control Solenoid, and based on the restrictor pills contained within the boost lines and the stiffness of the wastegate actuator, it is able to maintain ~20.3psi when untouched. When you install the MBC, the ECU _NO LONGER CONTROLS BOOST_. It is a simple, basic fact - the ECU is taken completely out of the loop with an MBC. Setting the MBC to minimum gives you minimum boost, which is 11psi. If you want 20psi, then you crank up the MBC until you get to 20psi. If you want more than 20psi, then you keep going. Where did you get the idea that MBCs "chug out around 5psi"? Very strange comment there.