Dyno Plots

[jogi730]

I've tested two 2.2's with GT35R (35/40) and both had full boost before 4000. They spooled so fast that surge became a problem at about 1,6-1,7bar so strange that yours need a 1000rpm's extra

The T61 plot looks good for a 2.2. P-trim with .82 AR?
Used a a T61 P-trim 0.96 AR on my 2.5 earlier and that setup spooled about the same as yours. A real kick at 4000

Yes T61 with P - trim, although can't remember the AR? As you say, laggy, but oh boy what a kick.
I may also try keeping this turbo, but with O-Trim. Apparently that spools up considerably quicker. Changing to this would be considerably cheaper than buying a new turbo and if it gave the desired low down pull it would be great fun.
ROll on 2009!
CHris

[jogi730]

Just to make thinks easier to see, I have had results of both turbo's transposed onto one graph.
One thing that is evident is that the boost curve of the GT35/40 dyno plot is LATER not sooner than the T61 boost curve - INTERESTING huh!
Both power and torque come on later and have a shorter duration so very peaky is the term apparently. There is no boost plot for the GT35/40 as it seems they saw fit not to log this data? Strange me thinks
Cheers
Chris