The horsepower made is actually pretty much in line with what you would expect at that boost level so the dyno does not look too bad to me even if it was running a little rich

 

i wish I had that power curve on my last dyno

 

Every dyno I've run has been this way.... I always assumed it was just due to the air mixing with the exhaust at the tailpipe.

Running way rich!

 

im pretty curious about this too..im not able to get more than 5 psi out of mine on just the wastegate with no boost controller...but then again im not sure how accurate my electronic prosport boost gauge is **my wastegate actuator arm is closed all the way too..if i cant resolve mine i think i might get a pressure test done by a professional just to give me piece of mind i have no leak

 

Hmm. Some might be up to a 1/2 point off, but most are dead on if you don't have a CAT.
Its hard to get outside air to reenter an exhaust that is pumping out at several hundred CFM.

Would you buy a ruler if the salesman told you that it is always exactly 1/8" off?

 

how's the car feel at 5psi?

 

HAHA - I have worked around it..... but I would be curious to know the deal.

 

imo it feels very similar to my non upgraded greddy turbo kit before with spikes to 10 psi and falling off at 8 on my same prosport gauge ***minus the power loss in the upper rpm like the non upgraded greddy*** with the bnr turbo it feels like it makes good power above 8k no prob

 

So when I went to another place with a dynojet that same exact tune showed AFR's in 10's...then when Kane came up here to tune we discovered it was actually in the 8's because of the amount of fuel he had to remove.

So the debate was which dynojet had an accurate O2 reading...

 

8's? How did you measure that?
Very few wide bands (short of the Horriba) can measure below 9:1.
The factory WBO2S only goes down to 11:1 (10.7:1 on some models).

BTW - you guys that are only seeing 6 PSI on the upgraded turbo have forgotten about flow again, haven't you?

 

i dont think so i have jeff...care to school me??

 

Flow is all that matters.
The BNR at 6 PSI may be flowing WAY more air than the GReddy at 9 PSI.
Look at your MAF numbers at peak boost.

Remember - if you could have ZERO boost, you would be really happy.

 

***skooled***.....thanks jeff

 

I was hoping my 4psi was all flow related but I dont think my exhaust is that good! lol!

 

Has anyone looked at the Porsche variable bladed turbo design?

 

MM,

We figured this out based on the fact that the DJ only was able to read 10.2 I believe. So with as much fuel that we had to remove to make it read in the 11's like we wanted to Kane said it was somewhere in the 8's. I cant remember what percent exactly it was. But it sure was running rich as hell.

Yes, time and time again I always see you pointing out the FLOW talk. I understand it. Thats why people cant make the assumption on HP solely X PSI vs X PSI on two different turbos. Because the flow characteristics are going to be different. Some turbos flow better than others...point taken.

 

Whilst I understand what you are saying , the simple fact is that the BNR at 6 psi is going to make somewhere around 265whp (depending on tune etc)- I doubt very much that these guys will be happy with that .

 

LOLZ yeah - once the P2's came on; I had to take out about 25% of the fuel just to budge the AFR's off 10.

I had mine flow tested later on - they were "730" - but in actuality - they were 800cc.

 

The stock wastegate is a 7 psi spring. After pressure drop through the intercooler and a little back pressure on the wastegate valve it gets 4-5 psi to the engine. After that you need a boost controller. If you want to see what the stock wastegate does, remove the boost source going to the wastegate. Keep an eye on the boost b/c it will climb very fast. If your car isn't tuned you don't need to try it. If your boost stays at 4-5 psi, either you have a boost leak or the wastegate is too weak to make more boost. If the boost climbs, then you just need a boost controller. Keep in mind that the more boost you run the more powerband you are going to have.

Bryan@BNR

 

/\ Boost controller will only be of any use up to about 6500rpm - after that the increase in backpressure will overwhelm the wastegate and boost will drop away rapidly .
An rpm adjustable boost controller helps but does not completely solve the issue if you are pushing for max. HP .

 

stop postwhoring, bryan. go and finish the turbo that i sent you.

 

So, PhantomRX-8 & gregs did you guys get your cars sorted out?

 

^^i havent yet..my car is at the body shop..should get it back by wed. once i have my car ill do some data logs and maybe just crank up the boost with my profec

 

Let me know how it turns out when you crank up the boost! that will be your face when you do....

At least that was the look I received when I pulled an STI...

 

lol, ill keep you posted!