Thanks, I'm permanently vented to atmosphere, catch cans always empty apart from a fine amount.
Do you still have the air straightener insert inside the pipe before the maf? You should have a solid set up and if there’s no air leaks, should run fat. I’ve been with shoemaker performance since 2018 and has tuned every version of my car from a basic v3si to now my v30 and the best part about his work is that he listens. Maybe consider him?
If I had a dyno at home, my car would stay on it.
Agree 100%.
It's possible. I usually command leaner lambda if backpressure is super-low to account for this. The right way to do it is to use "blow through" logic that Ford built into it. This calculates the amount of air that bypasses the combustion process and the effect it has on the O2 sensor reading, and accounts for it. However, it's nearly impossible for us to properly calibrate this data. Oddly, Ford disables this on Coyote and GT500, but enables it on Ecoboost and the stock Roush SC calibration.
Ford actually calculates the exhaust temp and cam timing is one of the inputs. According to their tables, the difference is negligible between the two cam timings used up top.
I accidentally accounted for the O2 sensor effect on the dyno. I attempted to run it leaner without cats since in practice you can, due to not needing to keep the cats cool. However, the blow-through effect on the O2 sensor signal actually put the true lambda right back where I started. I knew this after looking at fuel flow and injector pulsewidth. So, the power effects could be isolated to backpressure, which I think you are correct in that it reduced the blow-through and trapped more air. Now...could I have gained more power without cats had I run less overlap? Possibly, not sure.
I would have thought similarly, but I've even found power even on stock NA gen3 engines by reducing the top-end intake cam retard vs stock, thereby making it similar to gen1/2/voodoo/mach1/bullitt. Like I said, I have no idea why Ford would over-retard the intake cam up top on a gen3. (I fully expect that some Ford engineer is reading this and knows the answer but can't reveal it (PM me please))
With a centrif, getting more flow through the engine will reduce boost level, which allows the compressor to run further to the right on its curve. This increases airflow and power. On PD, the "curve" is vertical, so it flows essentially the same regardless of boost. So on a centrif, getting the cam timing right can lower the boost level which leads to more flow, which has a more dramatic effect on power.
Yes I see your point, I hadn't thought of that but yeah the CFM will increase through the compressor. So maybe it's not quite as bad as I thought. It's just the O2 readings that are a bit messed up.
This is likely the only way of putting it closer, still a guess but its impossible to detain what o2 is additional to combustion or added by blow through without some fancy engine simulating software. How much do you dare though? try a little more until seizure and then back a notch
And you are a wengard backer we see……. Hey to each his own just cause you had what you claim bad customer service doesn’t mean there are plenty of us who have and still have great service with Lund… I’m no high profile customer. Just order my tunes and follow the simple directions given by Lund and always answer any and all questions. Now I’m shure wengard is good and has his haters also… problem with these forums is who ever the person is tuned by they will recommend there tuner as best.
I back wengerd based off my experience, just like i dont back lund solely for my experience. I didnt say lund is bad, i said i wouldnt go with them. And yes, people on forums will promote who they have, why on earth would i promote one tuner but use a different one
i tried lund, moved elsewhere, just like forestlump doesnt like his current tune and is going to try elsewhere
Hey don't attack me with your opinion a-hole!I back wengerd based off my experience, just like i dont back lund solely for my experience. I didnt say lund is bad, i said i wouldnt go with them. And yes, people on forums will promote who they have, why on earth would i promote one tuner but use a different one
I should say problem with the people on the forums is they take everyone elses personal opinion and decision as an attack on them personally, were all opinion based here on a question of which tuner to go to
How old is that tune ?
Geez ... that hasn't changed since 2011 then. So much for innovators ha-ha.
