13-11-2013, 11:15 AM
Hi all,
I am playing with inlet lengths on the GTi6. Myself and Wayne Schofield found that we've made a lot more power with longer trumpets and even more length using spacers behind the filter housing. We are seeing the thick end of 220hp now and 185lbft across the board.
So far we're using the standard Longmans manifold, 50mm of spacers and 90mm trumpets (120mm don't fit inside the filter).
We made even more power by using 75mm spacers, but then the filter housing fouls the bonnet.
How do people get to optimum length inlet? I did purchase a sachell inlet manifold about 2 months ago but it hasn't turned up yet, I'm led to believe that points the bodies down a bit more.
Also, we've been trying to tune out the resonant frequencies in the torque curve by using two different lengths of trumpets on 2 banks of cylinders with some good results. Has anyone gone down this route before?
Watch this space for pics, vids and dyno plots. There's a tonne of information about to hit the forum.
JP
I am playing with inlet lengths on the GTi6. Myself and Wayne Schofield found that we've made a lot more power with longer trumpets and even more length using spacers behind the filter housing. We are seeing the thick end of 220hp now and 185lbft across the board.
So far we're using the standard Longmans manifold, 50mm of spacers and 90mm trumpets (120mm don't fit inside the filter).
We made even more power by using 75mm spacers, but then the filter housing fouls the bonnet.
How do people get to optimum length inlet? I did purchase a sachell inlet manifold about 2 months ago but it hasn't turned up yet, I'm led to believe that points the bodies down a bit more.
Also, we've been trying to tune out the resonant frequencies in the torque curve by using two different lengths of trumpets on 2 banks of cylinders with some good results. Has anyone gone down this route before?
Watch this space for pics, vids and dyno plots. There's a tonne of information about to hit the forum.
JP
JP