Recent content by engineermike

Does anyone here run 87 in a mustang?

The irony is that cats last much better in e85 than pump gas due to the lower EGT.

I have very strong, thorough, and detailed advice, and have proven them to be extremely effective and useful. But if you aren’t tuning yourself, I can not help you.

Definitely surprised the heck out of me. I made a dyno pull without cats (straight pipes), then swapped GT500 cats in and made another pull within the hour. It gained something like 15 hp IIRC. I'm guessing it was related to blow-through, either by losing charge or the effects of the lost...

You can also do boost-by-drive mode, ethanol content, charge temp, lambda, octane, gear, rpm, etc. But your TB model needs to be sorted out for any of it to work.

It’s very easy to fix this in the tuning.

.88 x .95 x 60 =50.16 I could buy 50 na but 60 is high. Sounds like your tuner owes you a better maf transfer function. Or your fuel blend isn’t correct. That’s not how that works. If they commanded .76 then fuel trims will do what they must to make it hit .76. That’s just saying that it’s...

Ok @horsepower addiction said it, that the tuner might have just commanded .76. That’s between you and him. .76 isn’t unheard of, roush, ecoboost, and predator command as rich as 0.7. It’s a little rich for na but won’t lose much power and might even gain a little if it delays cot or allows...

Is this supercharged?

Cot usually activates within a few seconds of going wot. Doesn’t really matter what you were doing just prior. They heat up quick at wot. Log the calculated cat temp and you’ll see.

You guys would be really surprised to see "under the hood" of these aftermarket tunes and what they actually do on the transmission side. Really surprised. But this is why I asked the question I asked...what is the complaint about the shifting? This tuner does this and that tuner does that...

Correct, let’s not forget removal of components such as the intake manifold, tb, fuel rails, injectors, bolting, hoses, tensioner and belt, fuel pump, etc. I bet it’s 40-50 lb of parts removed before installation begins. The bare manifold is 20 lb by itself.

Maybe I’m a day late but I think this makes it easier to envision:

@honeybadger one more interesting thing that is hidden in the octane rating of ethanol… RON and MON are tested at refineries using variable compression ratio carbureted “knock engines”. The test specifications were established a very long time ago and are shared by all refiners as industry...

Of course we’d all love to see such a specific test, but this paper answers a lot of questions and makes some valid and applicable points. If you want real world mustang results, there are tons of people out there running boosted mustangs at outrageous cylinder pressures on untested pump e85...