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Re: No so fast
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Posted by vigge [Email] (more from vigge) on Thu, 24 Feb 2005 14:30:22 Share Post by Email
In Reply to: Re: No so fast, Dean, Thu, 24 Feb 2005 13:18:59
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Ok mayby we got confused. I understud this part

>So thats the short story. You can get more T and HP from a T7 with >changes to intake and IC as well as the exhaust. You do not need to make >ECU software changes for every little thing that you change, thats >simply not the case.

as a synonym to "you can get more hp from T7 with HW mods only, no SW mods needed for evrery single piece"

I think we all agree that T7 controls airmass, which is as we know proportional in some degree to torque/hp. This changes though with VE just like you wrote. You can think of it backwards also, on a warm day turbo duty cycly will increase which leads to worse VE and you wont have the same power any more, it will be less.

What we need to remember is to take into acount how the system, T7 in this case reacts to HW part mods. This was the part I did not see covered in your text. The graph that I posted are MAF values before and after intake pipe change. Turbo intake pipe hardly chnages the VE, so you can basically think that if you loose airmass with the mod you will loose power. You can do the math, count out how much hp is lost with the lost g/s and std HW and compare the result to how much the VE needs to improve in order to regain same power output. I believe you will shortly come to the conclusions that the hardly better VE just absolutely cant compensate for the lost airmass read at MAF.

>And if the air mass flow did not change, then the A/F would be affected? >Why? So maybe no A/F adaption issue there at all.

The point in my post was that one cant assume that the airmass flow would be untouched after HW mods, even though the system is supposed to boost to achieve ECU set target airmass, just like the common oppinion says.

I should have the quoted exhaust results in hand with in two weeks or so.


My 0,02


posted by 81.197.20...
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