I will say that I had the slight downward slope and had a good tail wind....plus it was 37 deg (by my car's thermos)...all the things came together this morning. Interestingly enough, I had a torque limit in first that I get sometimes (not traction related....shows up on the pre-ign counter) but that didn't seem to hurt me...just my 60' time.
I understand but....out. Really like the no-bs just drive it I get with my Unitronic tune. No drama with fuel etc. I can't even get E near my house. If APR tightened up and had flash-at home MAYBE I would buy the tune to have when I wanted it. But for now, a ~4.5 sec 0-60 on pump gas car is plenty to hurt feelings and have a great/reliable DD. If this IS20 ever goes, I'll go to the IS38 with the Uni tune for sure.
You do realize that you shouldn't be running leaner on an ethanol blend though. So whatever you run on 93, you should be running at least a full point richer for e50. Stoich afr for gasoline is 14.7:1 and e85 is like 9.7.
No you don't. Plus the lambda is based on the fuel the tune is for. So on gasoline. The lambda is based on 14.7:1 being stoich. So if you run 12.5:1, your lambda is .85. A lambda of 1 is stoich. So for e85, stoich is 9.7:1. To get a lambda of 1, you would need an afr of 9.7:1. If you are running 12.5:1, your lambda is 1.288 and you are lean. Alcohol does not like to run leaner. You still target a lambda of 1 as stoich, but that has to be calculated on the proper afr for the fuel. You most likely need to be at least 12:1 afr for e50. I would have to break it down better to calculate, but your lamba for that tune is based on gasoline
The lambda is 100% based on the stoich afr the tune is set for though. So if this tune is based on gasoline. The lambda is set based on 14.7:1. If it were e85, the lambda would be based on 9.7:1. So how rich the lambda is doesn't mean anything. For e50, you would need to base the lambda on 11.5-12:1 for stoich. So if you wanted a lambda of .89, you would see an afr of around 9.5-10.0:1. So leaner or richer lambda doesn't mean anything if it is not set based on the stoich of the fuel you are using
Yes, but the lambda value is always based on a stoich number. So to calculate your correct lambda, you have to find the stoich of the fuel you are running. You then divide your afr by the stoich value. A lambda of 1 is stoich. Anything overr1 is lean. Dangerously lean. Typically on any tune, stoich is lean. So your lambda on alcohol should still be lower than 1.
Not sure about that. He is running the same pump. Ethanol requires more fuel. Either way, unless you are tunes for ethanol, you ar running way too lean. Lambda doesn't mean shit unless the tune is for that exact fuel. So going on about the lambda is pointless. Your lambda is based on a 14.7 stoich. And that is that
But leaner is not good when you are using ethanol on a tune for gasoline. You need it to be way richer. You need to run a lot more ethanol vs gas. So it the tune being leaner means it is more dangerous
He's not using a jb4 and he can view his actual afr. While the factory ecu adjusts some, there is no ethanol sensor. Plus, you do not know how much the APR tune can adjust. Maybe e30 is ok. He has been running e50
No mystery to me - that APR 100 tune is beast mode, period. And since it seems nobody runs it, it looks even that much more crazy. The comparison (in general) is against standard APR/Unitronic St2 IS20 tunes for 91/93 that most folks are running. I'd like to see your numbers on the 93 tune to see how much you'd lose which would really put the tune in perspective. The OE vs. aftermarket hardware isn't as critical to the performance as you've shown.