I've got a local customer who's just completed his new STS turbo system on his Explorer. It was a completely custom kit, everything was made custom except for the turbo. He came over tonight and where as I don't have the time just yet to goto a full dyno tune with him we got it running safe and with a great power. We'll be going to the dyno very soon.
After a test drive with him on the 2-3 lbs we got everything set and running right. It pulled good, more so like a mild V8 without any punchy power band. It was nice but we wanted more.
Next he went to the back and adjusted his wastegate controller and raised the boost to 6-7lbs and WOW! This thing flat out HAULS BUTT! I just kept saying " Wow, all of this in an Explorer too" hhahaa.
I kept putting the tuning to it until we finally had to stop, we were starting to get knock sensor activation of just a few degree's, 1-2 degree's. I backed it down a few and told him that'll we do the rest of the tuning on the dyno where we can ensure a proper a/f ratio. We've already been one time when he was n/a and tuned the Explorer for use with his 76mm C&L meter.
His list of mods include...
Custom STS turbo put together by www.GraceMotorsports.com
76mm C&L meter
30lbs injectors from Explorer Express
Bamachips X-calibrator Tuner
I'm not exactly sure what size the turbo is, I think he said something like 63/58 ?? I don't care what size it is, just how much airflow it makes.
He doesn't have any pics of the way it routes so for now I'll tell you. The turbo sits where the spare tire was, then the piping comes foward along with passenger's side and then up above the tire and through the wheelwell to the MAF and then the TB. He used the MAF in a blow-through design and made sure it had plenty of straight piping both in front and behind it.
Here's some photo's to tease you with :)
STS Turbo #1
STS Turbo #2
STS Turbo #3
STS Turbo #4
STS Turbo #5
STS Turbo #6
This should get real interesting as he also has a Snow Performance boost cooler and we plan on making a 93 race tune for the track using 10psi and the water injection on the dyno.