MX313

Thanks guys for all the good info.

byeboty

You and engineermike hit it on the head, at least thats what it feels like seat of the pants. I've wonderd why it feels like it loses some pull at top end till it shifts. What kind of boost gauge you guys using? Thinking about a electronic boost controller with gauge in it. Thanks for the info!

byeboty

The torque graph also shows it dropping off at higher rpm probably due to the boost being lowered. Sure wish we could see 15 psi across the entire rpm band!! LOL! Saftly, that is!

user_name

Very interesting. I am only familiar with tuning boosted cars with aftermarket kits. That would tend to make me believe there is a lot of room to make more power at least across the band with good fuel and a good tune.

NASSTY

I have an Autometer mechanical boost gauge.

It's definately wierd the way the boost drops off.It's wierd to me anyway because I've been playing with Grand Nationals for 23 years.My GN stays at full boost until you lift off the throttle.I run 26psi with alcohol injection in the GN.

byeboty

NICE! Boost is king!!

93Cobra#2771

iTrader: (2)

Only the gt500 is boosted (supercharged). They started doing it on non boosted cars to keep them from eating transmissions. Before drive by wire throttle control it was done by cutting timing way back during the shift as well as making the a/f heavy rich at the same time. With drive by wire you can't even powershift a car (shifting gears without lifting foot off throttle). That's why late model stands pick up such solid gains with a simple tune.

engineermike

I knew they were doing something like that to protect the transmissions, but the EB cuts back on throttle during the pull between shifts. It rarely actually goes to full throttle.

byeboty

Engineermike. Are you seeing the throttle angle in percent on a scan tool being cut back? Im an ase master tech and have my own Ford IDS, which is what the Ford dealers use. That's interesting, I'll have to check it out on my IDS.

engineermike

Yes, using a scangauge. The throttle position max's out at 75. When I first hit it, it goes to 75, then backs off to 40-60 the rest of the time. I thought I had the wrong tag or something, so I tested it on a 2010 Explorer (fly-by-wire) and it stayed at 75 the whole time when floored.