Is there a generic standard as to how much 1 lb of boost will give you in hp? Curious cuz Im trying to figure out about how much more hp I will get by adding a MBC to control my boost. I am not sure but I think GIAC 93 oct chip is probably peaking at what 16 psi? And leveling off at around 12 or 13? Was wondering what my gains would be by peaking at 21 psi and maintaining around 17 or so. Thanks.

 

you cant do that since it varies on the engines NA power output, turbo, exhaust, etc etc... Your best guestamate is to take pre and post chip hp and go by that. But do take into account that the more boost you run, the closer to or further out of the effincy range you put the turbo in.

 

would peaking at 20 or 21 psi and avg 16 take the K03 out of efficiency? Not sure what the stock numbers were or what my current numbers are. will have to hook up a boost guage to see I guess.

 

the ko3 is fine up to about 22-23psi. After that, your not going to make more power running more psi. The 1/8t/2.0t make more power with timing that they do with boost. People with revo and sps3 devices run less boost and more timing.

 

On our engine... with our stock turbo... I've seen posted in numerous places... that 1 Bar will = 100% power increase over the N/A output of the engine (minus drivetrain loss)

But you have to figure that the N/A output of the 225 for instance... is NOT 225 since 225hp is the output AFTER the stock boost is added.

Anyhow... 1 Bar = 14.7psi.
So 14.7 psi = 100% increase in power (then subtract drivetrain loss of at least 15%)
If 225 runs 11psi stock then (11psi/14.7=75%) so 225 is= (N/A output + 75% increase from boost). so 225 TT has 225 = 175% of N/A output.
N/A output = 128.475hp (this doesnt have the drivetrain loss factored in.).
But if N/A output is 140... and you're running 22psi... then (22/14.7=149.6% increase OR 249.6% of 140hp)
22psi SHOULD be 320hp @ the crank before heat and drivetrain loss. Probably closer to 265-270hp after losses.

 

so 1 bar of boost on a ko3 is the same as a gt28rs and the same as a gt35r and the same as a gt42r?

 

lol... no.
You cut out the most important preface to that sentence. re-read it

That's just the stock turbo. and the 1.8t from what I read.
Im sure it would be completely different for different engines... and I know it'd be different for different turbos.

fyi... the threads I was reading it on were referring to the k04 and 225 TT. Dont know how close it'd be on the 180.

 

The only way that would be true is if the turbo pushed the same amount of air a 1bar and the engine takes in NA, and i dont see that being the case here. But your right, i did kind of stopped reading.

 

I really need to find that thread that talked about that. Like I said TTsteve, this is what I've read in a few places; but it has been quite a while since I read it so I honestly don't remember who it was or how legitimate the source. It was when i was fairly new to the forum (actually i'd been a member for a while... but only logged in once for the first 7 months i was a member i think) but i was new... and it could have very well been audiTT225 or any number of people that said it. If I saw it now... I could probably give you a better idea of how legit it was based on the post author. I honestly dont remember.