- Fri Jun 15, 2012 2:34 pm
#3357779
The Girthatron was a bit of a fail sadly 
Today was not actually 'fair test' as no back to back was done, but here are the variables that had changed from the last dyno run @ TDi-N:
* Summer not winter, +10 degrees IAT on average per run (23 deg)
* Tesco 99 used, BP 97 used last time
* Less favourable humidity and air pressure
In Pauls experience over years and seasons, the environmental variables between today and the last dyno in January should account for around 7-9hp loss.
Never the less with the 3.5" Short intake we were struggling to get over 260hp (11hp or so down from last time) :bad-words:
In the back of my mind I was worried that this intake design might not be optimal for building velocity and stacking up the resonance correctly. So I took the liberty of bringing a 2.5ft length of spare 3.5" alu pipe with me. We chucked this on so it was sticking up in the air with a v-stack and ran it a few times for the sh*ts.
Boom... 265hp
Neil then chopped the pipe in half to around 18", we ran it and made a similar sort of number. Paul then moved the cam angles and fuelling around a bit and came up with a consistent 267 - 268hp
Running this longer setup in the cold of winter should put me back to where I was before + maybe 1 or 2 extra horse power.
SO what have we learnt?
* Around 28" of intake length works for my motor (similar length to the injen CAI funnily enough)
* An SRI doesn't do you any favours
* The jury is still out on 3" vs 3.5" for a 2L... I think there might only be a few hp in it. :think:
Thanks again to Team TDi.
Today was not actually 'fair test' as no back to back was done, but here are the variables that had changed from the last dyno run @ TDi-N:
* Summer not winter, +10 degrees IAT on average per run (23 deg)
* Tesco 99 used, BP 97 used last time
* Less favourable humidity and air pressure
In Pauls experience over years and seasons, the environmental variables between today and the last dyno in January should account for around 7-9hp loss.
Never the less with the 3.5" Short intake we were struggling to get over 260hp (11hp or so down from last time) :bad-words:
In the back of my mind I was worried that this intake design might not be optimal for building velocity and stacking up the resonance correctly. So I took the liberty of bringing a 2.5ft length of spare 3.5" alu pipe with me. We chucked this on so it was sticking up in the air with a v-stack and ran it a few times for the sh*ts.
Boom... 265hp
Neil then chopped the pipe in half to around 18", we ran it and made a similar sort of number. Paul then moved the cam angles and fuelling around a bit and came up with a consistent 267 - 268hp
Running this longer setup in the cold of winter should put me back to where I was before + maybe 1 or 2 extra horse power.
SO what have we learnt?
* Around 28" of intake length works for my motor (similar length to the injen CAI funnily enough)
* An SRI doesn't do you any favours
* The jury is still out on 3" vs 3.5" for a 2L... I think there might only be a few hp in it. :think:
Thanks again to Team TDi.
