Little. Blue. Different.

[rose0529]

awesome! Glad to hear you got everything sorted out and running good! The blackness looks very nice!

[scheides]

This thing holds boost awesome. Boost taper is really an issue with the stock turbo, a 24psi spike would end up at 19psi or less on a MBC. Using a GM BCS holds boost much better up top, but not like this thing. I've logged 24psi @ 7800rpms on a 3rd gear pull, that just wasn't possible before.

[Kracka]

Boost taper is really an issue with the stock turbo, a 24psi spike would end up at 19psi or less on a MBC..
Not on Gheyrod! :D

[scheides]

Not on Gheyrod! :D

This is true! Your car does dang good on a MBC....I just remember Jim's car and others tapering to like 17....even with a big spike it seems to fall fall fall. Your car likes timing more than boost though, so it works!

[niterydr]

Nicely done!

[scheides]

Here's a graph I made a few days ago showing how this turbo holds boost way up top. This is a *rough* tune, so its a little choppy and has a few low spots. This is a basic 3rd gear pull...sometimes on my IX turbo I could hold boost pretty good up top in 4th gear, but not like this thing! I've logged 24.7psi @7800rpm.

http://www.scheides.com/misc/pics/evo/bbk-boost-airflow-initial-pump.jpg

The spool area is a little lacking, I switched some settings in my bcs stuff that cuts down max upward correction based on TPS, and the net result is less WGDC during spool-up. I'm trying to figure out a way around it, as it induces a bit of lag, yet the turbo flows more than the stocker so while driving it, you really don't notice.

============

More info, just a general update:

I've put about 300 miles on the car (it is my daily driver) since putting the turbo in, and after getting boost dialed in, I have been having nothing but fun with it. It's natural to want to shift as power peaks and falls off. On the stock turbo it happens around 6000 and then shift at 7000. With the BBK, 7800rpms is there before you notice and its time to shift! I have GSC Beehive springs w/ kelford 272 cams and have an 8300rpm rev limit, but I try and shift before 8k to keep the bottom end happy for a long time to come.

Cruising and part throttle, the car actually feels more responsive than the stock turbo. I'm sure part of this is tuning, but the car def feels more torquey under daily non-WOT driving. At 70mph on the freeway, top gear, I can step on it and roll back the throttle a bit and get plenty of passing momentum, it is just so close to the stock turbo it is amazing.

Lastly, the week before I installed the BBK I had been taking care of my brother's dog, Mack. Mack is a pointer/lab mix and 80 pounds or so of spaz-tastic energy bursts. I strained my shoulder/neck a little in the mix of things, and then doing a turbo install, my neck was less than happy but I wasn't really in pain. Well, the BBK did NOT help things, my neck felt WAY worse monday and tuesday....ironically i was doing pull after pull after pull doing street tuning Weds was bad and today I've been taking it easy and it finally is starting to feel better. So yea, hang on tight, cause this turbo means business!

[turbotalon1g]

This turbo sounds great. It also sounds like you are nothing but happy with it.
The bottom end should be fine with a good tune.
You got a rocking setup.

[scheides]

I just want to say, stock turbo'd evos are SO MUCH FUN, and that's what makes this thing such a blast. 16g's are still my favorite, but its freaking awesome that there's products like this on the market. Now, if it lasts another 65k miles like the stocker did, I'll be extra happy!

[turbotalon1g]

wish they would make one for a dsm

[A//// Guy]

Maybe I should throw your old turbo on the A. lol