Lowering boost to prevent knocking...

[kaninbu]

ron97 is rm3 per liter really can't imagine the monthly cost of petrol for treks.

 

[stutzedward]

Well, I was running 97 since I got the car almost 4 years ago and only refueled 95 from last weekend after lowering the boost. The highest price I paid was RM3.40 per liter.

 

[Dayline668]

Yes.. not much diff ron95 ron97, just ron97 is better at suppressing knock, so u can run more boost n timing. In a normal N/A engine, u can only feel little better acceleration only.

 

[stutzedward]

I think the difference will be more apparent during hot weather + high boost comparing 95 vs. 97

 

[maxcheong]

hi guy, am pretty new to turbo car. I have a question, how u all know your engine is knocking? Do u have a gauge to show the knock count? or can u feel or hear the knocking sound?

Currently, am using RON97, boosting 1.3, very nice to drive as it is very powerful for me. Hence every time if I am the first car at traffic light and every time coming out from toll booth, I like to boost to feel the pulling power :-D

I know nothing abt turbo car, so hope any sifu here can enlighten me. Tq

P/S: I don't own an Airtrek Turbo, but I get to drive an Airtrek Turbo which belong to my cousin, who really seldom drive. Hence, he ask me to use it a long as I want :-)

 

[kaninbu]

engine knocking is cause by predetonation of fuel mixture.ignite of the a/f create a force to push the piston up n down.normally when piston 1 n 3 is down,2 n 4 is up.suddenly fuel mixture n 2 n 4 ignite,it was pushed down.this create a force that will break the crankshaft.in another word condemned engine.

 

[Dayline668]

I think the difference will be more apparent during hot weather + high boost comparing 95 vs. 97

Yes.. That is what high octane fuel for.. suppressing knock...

---------- Post added at 07:23 PM ---------- 6 hour anti-bump limit - Previous post was at 07:18 PM ----------

hi guy, am pretty new to turbo car. I have a question, how u all know your engine is knocking? Do u have a gauge to show the knock count? or can u feel or hear the knocking sound?

Currently, am using RON97, boosting 1.3, very nice to drive as it is very powerful for me. Hence every time if I am the first car at traffic light and every time coming out from toll booth, I like to boost to feel the pulling power :-D

I know nothing abt turbo car, so hope any sifu here can enlighten me. Tq

P/S: I don't own an Airtrek Turbo, but I get to drive an Airtrek Turbo which belong to my cousin, who really seldom drive. Hence, he ask me to use it a long as I want :-)

U can monitor knock using ODBII cable n software(evoscan for MIT) or after market knock detection system like what they use in dyno tuning. If u hear loud knock(like metal hit metal) from the engine, advice not to drive it until resolve problem if not... anytime engine boom...

 

[maxcheong]

engine knocking is cause by predetonation of fuel mixture.ignite of the a/f create a force to push the piston up n down.normally when piston 1 n 3 is down,2 n 4 is up.suddenly fuel mixture n 2 n 4 ignite,it was pushed down.this create a force that will break the crankshaft.in another word condemned engine.

hi, thanks for the explanation, it sound scary man, even the crankshaft will break.

---------- Post added at 04:48 PM ---------- 6 hour anti-bump limit - Previous post was at 04:45 PM ----------

Yes.. That is what high octane fuel for.. suppressing knock...

---------- Post added at 07:23 PM ---------- 6 hour anti-bump limit - Previous post was at 07:18 PM ----------



U can monitor knock using ODBII cable n software(evoscan for MIT) or after market knock detection system like what they use in dyno tuning. If u hear loud knock(like metal hit metal) from the engine, advice not to drive it until resolve problem if not... anytime engine boom...

When u say it can be hear like metal hit metal sound, do u mean it can be here in the cabin? or u will only hear it outside the cabin near the engine bay?

Thank you

 

[Dayline668]

Roll down your window n u can hear it... If knock that serious, your ECU will be in limp mode, no power at all...

 

[stutzedward]

I've been using 95 for almost 5 days now.. no problem at all. Glad that I can save a money from it, hehehe..

 

[kaninbu]

save almost 30% of petrol expenses leh

 

[stutzedward]

ya man... and also, can compensate some cost to run my RX8 as compared to my Sentra. Hehehe...

 

[maxcheong]

Roll down your window n u can hear it... If knock that serious, your ECU will be in limp mode, no power at all...

thanks man,

---------- Post added at 12:28 AM ---------- 6 hour anti-bump limit - Previous post was at 12:26 AM ----------

I've been using 95 for almost 5 days now.. no problem at all. Glad that I can save a money from it, hehehe..

hi studzedward, so u switch from RON97 to RON95, without re-tuning your ECU?

Just lower your boost to 0.9bar?

no knocking so far and power drop not much?

 

[stutzedward]

yup bro maxcheong. that is right!

 

[maxcheong]

yup bro maxcheong. that is right!

cool, bro, that is abt 36% saving on fuel price, assuming the mileage not much different as well.

 

[stutzedward]

FC dropped a bit. It was around 7km/L after I installed the Evo6 cams. It has came down to around 6.5km/L now.

 

[kaninbu]

remove spare tyre,moon roof and convert 2wd...200kg+- weight reduction.

 

[stutzedward]

UPDATE: Refueling Ron95

I've been using 95 for 2 weeks now. Boost is around 1.1 bar now (yeah, I've increased it). FC has dropped slightly from 7.1km/L to 6.2km/L. That is fine considering RM1.10/liter cheaper. ANd tell you something weird, I am feeling that 95 runs better in my car! Overall, the car is slightly more powerful and I don't feel too bad on hot afternoons too. Really dunno why....

And I know I am also benefiting after the Evo 6 cams upgrade. The increase of throttle response goes well with Ron95. Overall, I am happy and I should have done this long ago.

 

[stamen]

UPDATE: Refueling Ron95

I've been using 95 for 2 weeks now. Boost is around 1.1 bar now (yeah, I've increased it). FC has dropped slightly from 7.1km/L to 6.2km/L. That is fine considering RM1.10/liter cheaper. ANd tell you something weird, I am feeling that 95 runs better in my car! Overall, the car is slightly more powerful and I don't feel too bad on hot afternoons too. Really dunno why....

And I know I am also benefiting after the Evo 6 cams upgrade. The increase of throttle response goes well with Ron95. Overall, I am happy and I should have done this long ago.

so 91 for next week then?
just kidding bro

 

[stutzedward]

haahaa... no la.. in Msia, only 95 and 97. Dun have anything lower lo