General Car Conversation 2024 - part 1
07-18-24, 09:16 AM
#5881
Lexus Champion
) to you
07-18-24, 09:30 AM
#5882
Lexus Fanatic
Not to drag this on and I'll end it here, but Dyno's don't lie. You are not going to necessarily "feel" the extra torque, but it's there. Also, your engine would normally knock at hard throttle, but the ECU is pulling timing to prevent that. 100 percent 87 is not going to hurt your engine, many people put regular in their cars that require premium, but you are not getting the full benefits. But you know, at the end of the day, you are not hurting anything by using Regular, so if that's what you feel is the best, than more power (or less ) to you
) to you
07-18-24, 09:35 AM
#5883
Lexus Champion
This has been our point all along, nobody is saying it will hurt the car. It’s not going to hurt the engine but I personally want all the performance that the car can offer and I want that more than I want to save $20 per tank. For others fuel cost savings is more important and I understand that.
07-18-24, 09:41 AM
#5884
Lexus Champion
It's actually not a very complicated issue. Higher compression engines, and many engines with turbo chargers require premium gas due to it's higher ignite point, while regular gasoline has a lower flash point, and the higher heat generated by performance engines can pre ignite the fuel causing engine knock, which is why they pull timing. So if you drive a Toyota Corolla, you don't need premium.
Better yet, check the owners manual, and save yourself a big fight with your fellow forum members
Better yet, check the owners manual, and save yourself a big fight with your fellow forum members
My jag said 91+ octane only, it was fine on 89 with the new knock sensors and full refresh on the new engine I put in it. Never pulled timing......other ones pull on 91
07-18-24, 09:42 AM
#5885
Lexus Champion
You don't either vehicle with the 18 year old 5.7 that went into hundreds of thousands of trucks asking for 87, yet I can't find one instance of engine damage caused by cheap fuel and I've looked.
And nobody's fighting, I'm not. I just said it's absurd to suggest I'm missing 40ft/lbs of torque at 2500 RPM. I've run premium before and felt no difference. It's got a full tank of premium and we switched cars this week so I'll be driving the LX.
And nobody's fighting, I'm not. I just said it's absurd to suggest I'm missing 40ft/lbs of torque at 2500 RPM. I've run premium before and felt no difference. It's got a full tank of premium and we switched cars this week so I'll be driving the LX.
07-18-24, 09:45 AM
#5886
Lexus Champion
Not to drag this on and I'll end it here, but Dyno's don't lie. You are not going to necessarily "feel" the extra torque, but it's there. Also, your engine would normally knock at hard throttle, but the ECU is pulling timing to prevent that. 100 percent 87 is not going to hurt your engine, many people put regular in their cars that require premium, but you are not getting the full benefits. But you know, at the end of the day, you are not hurting anything by using Regular, so if that's what you feel is the best, than more power (or less ) to you
) to youYou really do not want any engine riding the knock sensors if you can avoid it
07-18-24, 09:47 AM
#5888
Lexus Champion
It absolutely will hurt it, timing pull occurs AFTER detonation even if very very minor. Drive that for a while and you will lose leakdown and start eating oil like SO MANY cars do. The emissions side of the equation requires the timing to pull and the mix to go rich as well to protect the cats and that increases carbon buildup in the rings.....and that gets you your oil consumption.
You really do not want any engine riding the knock sensors if you can avoid it
You really do not want any engine riding the knock sensors if you can avoid it
07-18-24, 09:53 AM
#5889
drives cars
The way I always look at this is... if you deviate from what the manufacturer recommends, whatever happens after that is on you.
Now, there are some cases where the manufacturer's recommendation is not great - for example, stating the transmission fluid in many Lexus models is a "lifetime fluid". I don't think it takes a degree in engineering to figure out that the transmission fluid is... uh, doing a lot, and thus, it is getting heat-cycled and broken down over time. It makes sense to replace it every few years/10's of 1000's of miles.
Now, there are some cases where the manufacturer's recommendation is not great - for example, stating the transmission fluid in many Lexus models is a "lifetime fluid". I don't think it takes a degree in engineering to figure out that the transmission fluid is... uh, doing a lot, and thus, it is getting heat-cycled and broken down over time. It makes sense to replace it every few years/10's of 1000's of miles.
07-18-24, 09:57 AM
#5890
Lexus Test Driver
I'll turn the dial up from "Not great" to very wrong. Haha
No such thing as life time fluids, mfg recommendations are debunked. Lol
07-18-24, 10:00 AM
#5891
Lexus Fanatic
That’s my mentality, maintain the car at least the way the manufacturer recommends. When something is “lifetime” you have to ask yourself what do they consider the vehicles life? Is it 150,000 miles? Probably. So if you want to keep it longer than 150,000 miles you are going to be well served by changing that fluid. Same with oil change intervals. If you’re going to keep it for 100k+ you should change the oil more often than every 10k
07-18-24, 10:08 AM
#5892
Lexus Champion
I change the "Lifetime" fluid in my Sienna about every 70K. I'm currently on 170k, so about to do another "Lifetime" fluid swap
07-18-24, 10:10 AM
#5893
drives cars
That’s my mentality, maintain the car at least the way the manufacturer recommends. When something is “lifetime” you have to ask yourself what do they consider the vehicles life? Is it 150,000 miles? Probably. So if you want to keep it longer than 150,000 miles you are going to be well served by changing that fluid. Same with oil change intervals. If you’re going to keep it for 100k+ you should change the oil more often than every 10k
Planning to do my transmission fluid every 40k, FWIW. That seems to be a common practice for folks with cars that have this transmission, especially given I drive it spiritedly.
07-18-24, 10:17 AM
#5895
Lexus Champion