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Old 02-07-2007, 11:44 PM   #26
foxboroxt
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Join Date: Oct 2004
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Location: Mansfield, MA
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2003 WRX wagon stg2
2011 Outback

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Umm, nope. Look again. You may have been looking at the VF34. The VF39 peaks in the low 3's whereas the 18g peaks in the high 3's (based on the TQ curves, not the HP curves). But look at all the VF39 TQ around 2500 rpm... 260+ ft-lbs as compared to the 18g's 210 at that rpm. 18g is always gonna have top end on a VF39 but for sure the VF39 spools better/earlier and has a better bottm end. And, it doesn't give up that much on the top either. For rallyX and autoX, I'll sacrifice the top end. And on the street, I'll rarely ever use that kind of power.
Ummm, nope. I was actually using the comparison tool on the ispeed site, which has very different looking graphs for the 39 and the 18g, compared to when you just select a single turbo dyno. As far as the overlaid graphs I was looking at, it seems as though the 18g catches up with the 39 at about 2700, after the 30ft/lb difference at 2500, which isn't much of an advantage compared to the plots you are quoting. I wish they would start all the runs at 2000.....

In terms of the individual plots, could some of that lag be due to the frontmount on the 18g setup, vs. the topmount on the VF39?

I guess the question is which of the graphs best represent the respective power curves?
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Old 02-08-2007, 12:09 AM   #27
thejean
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Originally Posted by foxboroxt View Post
Ummm, nope. I was actually using the comparison tool on the ispeed site, which has very different looking graphs for the 39 and the 18g, compared to when you just select a single turbo dyno. As far as the overlaid graphs I was looking at, it seems as though the 18g catches up with the 39 at about 2700, after the 30ft/lb difference at 2500, which isn't much of an advantage compared to the plots you are quoting. I wish they would start all the runs at 2000.....

In terms of the individual plots, could some of that lag be due to the frontmount on the 18g setup, vs. the topmount on the VF39?

I guess the question is which of the graphs best represent the respective power curves?
Good points. Hmmm... wonder why those curves are different? Well, no doubt the 18g is a good turbo for that setup. Again, I'll stick with the VF39 simply because it's uber cheap and offers not much less than an 18g or 16g.
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Old 02-08-2007, 01:42 PM   #28
foxboroxt
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2011 Outback

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True on the price of VF39's. I'm hoping people start dumping the 07 turbos (VF4???) soon, and that they don't have cracking problems. It doesn't seem to be an issue, but it would be nice not to even have to consider crack issues.
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