4RETECH

iTrader: (86)

Just wanted to put my .02 in.

I just hit 68,000 miles on my BBK-3B. Still running strong....

211Ratsbud

iTrader: (1)

I put a boost gauge pre and post throttle and I have seen greater than 10+ psi difference during part throttle conditions. Factor that into surge and target boost calcs. I always liked seeing what happens when you go up a hill and you're in a high gear keeping manifold boost low and pre throttle will be opening the wastegate. For a turbo that hits like this id be sure to tinker with that!

just to illustrate my point as well as others in this thread. sorry for the crappy video but you can see that even at part throttle the pre throttle boost is already hitting wastegate which is 15ish lbs during this Secondary air system test.

psushoe

iTrader: (8)

To add to the boost control discussion, I ran my first autox event on Sunday with this setup. It was a test and tune, and one element was a 55-60 mph slalom that went on for days. It 8 cones iirc, so plenty of time to develop a steady state rythm with fine throttle control. Doing the above mentioned changes and tuning, I have never had the car feel more controllable in that situation.

To add to the 3b discussion, this was also the first event in the dry with the new motor on the 3b. I ran the 3b on stock motor last year and it was a great autox setup, but there was noticable lag in really slow digs. With the new motor I also had lag out of a few digs, but that was because I was spinning all four Love this turbo!

CBRD

iTrader: (60)

LOL!!!

@ aaron-

cb

94AWDcoupe

iTrader: (125)

this is very interesting video. i have been running wastegate line from compressor outlet or lower I/C pipe for about ten years now. I did notice years back car felt faster on a manual boost controller with the signal line coming from the intake manifold. there is pressure drop at i/c so signal is not the same pre and post intercooler WOT. at that time I never considered part throttle effects. so there is actually three distinct boost signal locations with varied effects. manifold, upper i/c, and pre i/c.

but this video open my eyes to something else. BOV flutter at part throttle. with there being such a large diff pre and post throttle its no wonder the BOV cant stay on its seat.

211Ratsbud

iTrader: (1)

Edited:

Yes you have to chose your reference according to what you are trying to accomplish.

I know you like the type s so I'm sure you've nailed your drivability

sparky

iTrader: (1)

Edited

94AWDcoupe

iTrader: (125)

so now you have driven it some. could you ever go back to plain bearing for a turbo this size?

Erik@MIL.SPEC

iTrader: (94)

^^ That's a damn good question.

18bora

iTrader: (8)

I went back to a softer spring and it solved most of the flutter. I only get occasional flutter in 3rd/4th around 3k rpm

I had similar experience @ ATCO. the car would hook up nice out of the hole, but as soon as I go to WOT, all 4 spin with a little sidestepping. I couldn't get better than 1.8 60'

tsitalon1

iTrader: (3)

Slightly off topic...

I can upgrade my non-bb FP green to a bb red for $1800, seems high for a conversion which begs the question which way is the better route. BB red or BBB-K?

Goal is largest power band available on 93... With slight emphasis on spool.

mrfred

iTrader: (50)

These last four weeks its mostly been raining, or I have been out of town, so unfortunately, I still haven't had any good chances to really rip through the gears to get a feel for the transient response. I suppose that means its not light years better than the JB BBK Full or Green. Still, I like it so much that I've already sold the BBK Full and HTA Green.

psushoe

iTrader: (8)

I made the change for part throttle control. I have not really had bypass valve issues, but it did seem a little better with the new vac line setup. Probably because there was less pressure in the pipe relative to the intake manifold.

I cut 1.6 60's last year during Pro Solos on un-prepped surfaces. That was with bbk on stock motor and Hoosier A6s. With my race tires on, I can go wot in 1st with reasonable control in a straight line. The 2nd gear all wheel spins are on corner exit where lateral g's are still present. I admit I was going outside the friction circle on purpose, because all wheel drifts are so damn fun

CBRD

iTrader: (60)

we are using the new Tial QR-J's and they are super nice as far as release characteristics etc- anyone else try one yet?

just looking for 3rd party-

Thanks for all the other input everyone!

cb

scheides

iTrader: (10)

Good stuff sir! Glad you are loving the setup and love all the data!!!