222hp on first run (torque settings on dyno messed up, read 425 lol)
218hp/209tq on second run
3rd run was done in 3rd gear:
205.5hp/187tq

green was first run (tq settings messed up on the dyno lol, 425tq i wish)
red was second run
blue was last run done in third gear (hence the way lower #'s) i actually hit the throttle right after 4000, so disregard everything before 4000rpms on the blue run.
no audible knock thank god, though it was wayyy lean. i knew it was gonna be lean with no boost controller and no fuel controller but i just wanted to see HOW lean i pretty much just have a fuel pump, intake, exhaust, streetport running off the wastegate. time to put some pantyhose on that intake and get the boost down anyawys, best numbers were 222whp/209tq.

 

Jeez man, yah you are lean.

 

indeed. fuel controller here i come

 

i would suggest that you go with haltech. its more money, but a lot more tuneability.
and when you think about it....its not that more then a fuel controler.

just my 2 cents

we both share the same set-up for now......im going with haltech,4x1000 cc injectors and a fmic.

 

i just cant afford a haltech right now. i'm still paying for my engine(s) im just gonna have to put some pantyhose on my cone filter and lower the boost horray for ghetto tuning

 

Makes perfect sense, as the revs rise the walbro gets things really rich on the top end. The lean spot seems to be before the secondaries kick on then it gets progressively richer. Rtek 7's 1.5 ECU would do well here. How much boost was it making?

 

it was hitting 10psi in the midrange and bleeding off to ~5psi by redline.

ok, when do the series5 rtek7's come out? because i keep hearing all this bullshit about how great the rtek7 ecu is but its only for s4's

 

Are you still running the rats nest?

 

no. bare-blizzy my nizzy


i'm tryin to scrounge up some money for an safc + some 680 injectors... but its not looking good i might get a deal on my friends haltech but thats not looking good either

 

I forgot, stock turbos with no boost controller will lose boost by redline which also explains how rich the car gets. Still, that looks way too lean for 10 psi - perhaps your injectors are really dirty. Also, I forgot that the r7ek7 ECU is only for S4's at this point, sorry. I forgot a lot of stuff!!

According to Henrik's datalogs, a stock S4 TII STARTS running out of injector @ 10 psi w/ a stock turbo/fuel system. Past 10 psi you will start running leaner than stock. A walbro will help keep things rich on the top end when fuel pressure is up and the rtek7 ECU gets rid of the lean spot before the secondaries kick in. This is how it was explained to me...

 

the s5 stock turbo boost bleeding has nothing to do with boost control. its the inability for the stock compressor wheel to keep up with the high RPMs.

 

An electronic boost controller will fix that though... With a properly set EBC, boost will peak and hold at the desired level without falling off. I'm going to be re-doing my ported wastegate with a monster port and larger flapper. Then install my GReddy profec B spec II and the car should feel totally different up top since the car should hold an additional 3-4 psi. Now, it peaks @ 12 and bleeds down to just under 8 psi and I want to be running 12 all the time.

 

a boost controller will not fix the problem. it may help a little bit, but the problem is that the stock compressor cannot flow enough to keep the boost pressure up in the high rpms.

 

A manual boost controller won't, but an electronic will. As long as the desired boost level is above that which the car would achieve with NO electronic boost controller, the car will hold the set boost level.

 

Not necesarily. As Buttmill pointed out, the stock compressor wheel runs out of breath even on a stock ported engine.

 

As I understand it, an electronic boost controller will work the turbo harder to maintain the desired pressure.

 

it may get the turbo to push the desired psi earlier in the rpm band (so you could have say 12psi from 4000rpms to 6000rpms), but it cannot control the stock turbo's inability to flow air at high rpms. that 12psi will fall off real fast above 6000rpms even on a stock port motor.

 

I hit 11psi from 3800 - 4500rpm's.... then it drops to 10psi and holds that to redline. This is on an S5 TII with a T04B V-trim compressor upgrade.

 

I wonder if the A/F would have read differently if you'd run from 2K WOT to redline. 4K seems too high to begin with...