School me
08-08-2012, 12:08 PM
#11
Yes the Ecoboost engines electronics limit boost in first and second gear. If I remember right I get about 7lbs in first and second; then the rest of the gears I get 12-15 lbs. I believe its a part of the torque management system. Also it limits boost in some 4x4 gears. Some of the aftermarket tunes reduce or completely remove the torque management limits which will allow you more tire shredding action!
The only measure change to the turbos is the tunes. Removing the electronic limitations placed on these motors is the best route for the money. You'll see good results out of a high flow exhaust which will be higher torque numbers combined with that tune.
The only measure change to the turbos is the tunes. Removing the electronic limitations placed on these motors is the best route for the money. You'll see good results out of a high flow exhaust which will be higher torque numbers combined with that tune.
08-08-2012, 12:22 PM
#12
Boost :)
Comparing your Lightning to the EB in theory is a fair comparison, but in reality there are so very many differences. I've had both so I can help a little 
1. Supercharger vs. Turbo. Belt driven vs. Exhaust Driven. Already been discussed.
2. The BIG difference is throttle cable versus drive by wire. Lightning has an actual cable connected from your pedal to the throttle. The EB, as with most modern vehicles, does not and is all electronic. Most of what people here consider to be turbo lag is not so much the lag as it is the time it takes for the computer to process all of it and make the decision to go. Again tuning fixes almost ALL of that.
Those delays are specifically setup to maintain longevity of all the parts and systems involved. It's not so much an instant hit of the gas and the plate opens. The computer decides how far to open it, which in turns determines how much exhaust energy is produced, which determines boost and spool up speed, and of course determines shifting patterns as well. There are so many things built into that process that hinder the performance and response that it just baffles me sometimes that they bothered to do it.
My EB is tuned now and the difference is night and day. I've driven 100mm turbo cars before and know what lag is. The little pea shooters on the EB have almost ZERO lag to them. Sure there is a delay in downshifting sometimes and of course from a stop as well and that can be perceived as lag, but in reality, if you watch a boost gauge on this motor, there is next to zero lag.
Any time that you can build boost when a vehicle at idle and no load being placed on it (and the EB can) only further solidifies the statement that there is almost zero lag on these trucks. They leave a lot to be desired with the tuning.
A word to the wise though. Don't go drive or get in an EB with a tune on it. You won't like yours as much anymore
1. Supercharger vs. Turbo. Belt driven vs. Exhaust Driven. Already been discussed.
2. The BIG difference is throttle cable versus drive by wire. Lightning has an actual cable connected from your pedal to the throttle. The EB, as with most modern vehicles, does not and is all electronic. Most of what people here consider to be turbo lag is not so much the lag as it is the time it takes for the computer to process all of it and make the decision to go. Again tuning fixes almost ALL of that.
Those delays are specifically setup to maintain longevity of all the parts and systems involved. It's not so much an instant hit of the gas and the plate opens. The computer decides how far to open it, which in turns determines how much exhaust energy is produced, which determines boost and spool up speed, and of course determines shifting patterns as well. There are so many things built into that process that hinder the performance and response that it just baffles me sometimes that they bothered to do it.
My EB is tuned now and the difference is night and day. I've driven 100mm turbo cars before and know what lag is. The little pea shooters on the EB have almost ZERO lag to them. Sure there is a delay in downshifting sometimes and of course from a stop as well and that can be perceived as lag, but in reality, if you watch a boost gauge on this motor, there is next to zero lag.
Any time that you can build boost when a vehicle at idle and no load being placed on it (and the EB can) only further solidifies the statement that there is almost zero lag on these trucks. They leave a lot to be desired with the tuning.
A word to the wise though. Don't go drive or get in an EB with a tune on it. You won't like yours as much anymore
08-08-2012, 01:01 PM
#13
Thanks, guys! You've helped me out a lot. So braking and bringing the RPMs up to about 2k-2.5k at a stop and then letting it go is the way to get rid of most of that delay in a stock truck. That delay, while perceived as turbo lag, may not actually be lag at all. It might just be the computer catching up. Either way, bringing the RPMs up for a second either allows the turbos to spool up or it gives the computer the chance to catch up. It could even be a combination of both. Again, thank you for the help. Now I want to go test drive another EcoBoost to try it out, since I still have a decent wait until mine comes in. lol And I think I'll take the advice from TJFX2EB, and not drive an EcoBoost with a tune on it. Well, at least until mine is out of warranty. With the issues I've read about the EcoBoost, I don't want to take any chances. I haven't had to test my local dealers with any warranty stuff in the past, so I don't know how they would be regarding warranty work, should it arise, if the truck has been running a tune.