Atkinson cycle 3.5

OR17TRD said:
Some of the issues are variants on geography. Excessive shifting and gear hunting has been a problem for folks that live in the mountains and hilly regions. Those that drive on flat roads all the time won’t notice it. Take it into the hills and over mountains and you’ll notice it more. Axshole wrap happens more with lots of stop and go traffic. Complete stops pause and then a bump. Again if your in the country on flat ground with no stop lights you’re probably not going to notice it. The ticking is just a Toyota engine thing I’ve always driven toyota trucks and don’t notice that.
Click to expand...
I noticed my 2019 TRD off-road does that bump thing sometimes when I'm stopping at street lights is that normal or should I say something
 
As OR17 posted........"Axshole wrap happens more with lots of stop and go traffic. Complete stops pause and then a bump."..........Normal for our Tacos.
 
Bojangles said:
To what extent?

If I run 110 would I make more horsepowers than 91?
If so, how much 110 would I need to run to purge all the 91 out of the tank safely without cooking the fuel pump?

Even then, vvti is most likely load based right?
So.... How about octane on demand?

Where's Tom Nelson at?

Yeah I ramble a bit when I don't sleep well.
Click to expand...

The 2GR-FSE is tuned for 87 to 91 octane. At 87 octane its 304 HP and 278 lb/ft at 91 octane it makes 314 HP and 280 lb/ft.

The 2nd gen 1GR-FE on 87 octane is 236 HP and 266 lb/ft on 91 octane it goes to 240 HP and 278 lb/ft.

I'm pretty sure every Toyota VVT-i engine does this. I think it takes the engine a little bit to adjust so the first tank might lower mpg.
 
ToyTaco04 said:
The 2GR-FSE is tuned for 87 to 91 octane. At 87 octane its 304 HP and 278 lb/ft at 91 octane it makes 314 HP and 280 lb/ft.

The 2nd gen 1GR-FE on 87 octane is 236 HP and 266 lb/ft on 91 octane it goes to 240 HP and 278 lb/ft.

I'm pretty sure every Toyota VVT-i engine does this. I think it takes the engine a little bit to adjust so the first tank might lower mpg.
Click to expand...
Interesting, where did you find this out?
 
Bojangles said:
Interesting, where did you find this out?
Click to expand...

It shows it on the engine page on Wikipedia and I've read about it on different forums. Also Toyota test engines at 87 octane but Lexus they test at 91 octane same engine different power numbers.

I suspect manufacturers could make higher power and more efficient engines with higher octane and higher compression ratios. People buying Toyotas might be peeved if they said they had to run 91 vs the average Lexus customer. So makes sense to rate the engines by what the customer will most likely run it on.
 
ToyTaco04 said:
It shows it on the engine page on Wikipedia and I've read about it on different forums. Also Toyota test engines at 87 octane but Lexus they test at 91 octane same engine different power numbers.

I suspect manufacturers could make higher power and more efficient engines with higher octane and higher compression ratios. People buying Toyotas might be peeved if they said they had to run 91 vs the average Lexus customer. So makes sense to rate the engines by what the customer will most likely run it on.
Click to expand...
Interesting, wiki has always made me wonder....
Cant i go on there and change the text to read 400hp on 87 octane?
 
Bojangles said:
Interesting, wiki has always made me wonder....
Cant i go on there and change the text to read 400hp on 87 octane?
Click to expand...

Yes but things usually get corrected fairly quickly. Also, it has said those figures for many years.

It may not be the best idea to assume something on wiki is correct on first glance but if you look back and it always stays the same its probably right. Also if you find the information on other sites and discussions. There is a surprising amount of people correcting wiki.
You can also check the source pages where the info came from (not always) and the history of edits.

You can do some research its talked about for multiple engine models and if you look at Lexus papers for hp it will usually say tested with 91 and then check Toyota it will be a slightly lower power number tested at 87.

Manufacturers are actually pushing for single grade 95 and get rid of everything else.
 
Last edited:
You must log in or register to reply here.
Back
Top