i just got my SUPER STREET mag today and i went through the issue just now. they explained turbo tech and did dyno tests on boost controllers.

the boost controllers tested were:
-APEXi AVC-R
-BLITZ Dual SBC I-D
-HKS EVC IV
-GREDDY PROFEC B

the max power tested was on a 240sx with a SR20DET motor. i dont think motors are a great factor here though.

the max power was 183.2 at 12.5 lbs of boost

the results were: (with the boost controller)
-APEXi AVC-R 209.6@6,100rom
-BLITZ DUAL SBC 214.1@6,200rpm
-GREDDY PROFEC B 209.1@6,3000rpm
-HKS EVC IV 212.4@6,000rpm

this is very interesting.

 

Its cuz the SBC-id has an auto and manual mode so u can do all these sorts of adjustments I have yet to figure out..its pretty weird though..cuz if they r all banging out the same boost then they should hit down the same amount of hp theoretically..

 

what type of adjustments?

 

those seem like crappy numbers to me, for 12.5psi...:???: Am I reading this correctly to say that w/ NO boost controller the hp was 183, and by adding a boost controller (at the same psi?) the hp rose by 20hp? That couldnt happen. regardless, a dif off 5hp on a turbo'd car is nothing. they could be up or down 5hp between runs from a variety of reasons.

 

well... if you got a problem with the #'s, go talk to SUPER STREET about it. they have the dyno charts to prove it in the magazine.

 

I agree the 5+/- can happen for any reason, a gust of cold or hot air, someone exhaled releasing hot air into the intake tract.

but the 20 hp from the boost controller, interesting.

 

hmmm this is interesting. That's a lot of power for not raising the boost pressure at all

 

Could the HP actually come from different tollerances in the boost controller? IE the SBC is allowing more boost through then profec b?

 

My guess is that the BC can hold the boost pressure more consistantly and doesn't modulate up and down as much, bleeding and regulating as the other ones??

 

i figured that the boost controller is alot more consistent in holding in the boost pressure desired before slowing down the spooling of anymore boost... then releases it full blast! cool... doesnt make hp... just holds boost together better i guess.

 

If the boost controller makes a difference in hp what about wastegates? Like a electronic boost controller with delta vs. Tial wastegates

 

interesting thought, ray...

 

I don't have the magazine in front of me right now, but if I remember, the base run w/out the boost controllers was at less psi than the runs made w/ a boost controller. Check it out and you'll see. I have the SBC-id and I'm sure it didn't give me horsepower. Its a very powerful boost controller though. I have a 9 pound spring in my wastegate and when I set the boost controller to 0, I boost 6lbs. Thats actually less than my spring. Thats not supposed to happen. So I found that pretty cool.

 

less than the spring eh, how does that happen?

 

dont some of these BC's use fuzzy logic where they try to remember the boost curve for maximum boost pressure regulation?

 

Yes, the HKS does. I know the Greddy Profec A does, not sure about the b. I am not sure about the other 2.


[Modified by Big James, 7:20 AM 8/5/2001]