Quote:
Originally Posted by jrohner
I don't see how you can go by a dyno chart to tell you where full boost is. I make full boost by 2800 on my car, a hair over 3000 in 3rd gear, yet the dyno chart shows it at like 3800 and peak torque at 4200, both on the DD and Dynojet. The load is far different on a dyno than the street where it matters. The main chart I've seen on the HX35 had peak torque at 5 grand and made about 500 hp at about 7 grand at 25psi. It doesn't tell you where it makes full boost on the street, you have to go by what people say -- which is what I'm doing. This other guy is just saying 'I don't care what anyone says it's not possible' basically. Have you had one on your car or ridden with someone to really say it's not possible?
Besides, tune means a lot too, I can change my spool 400 rpms easy just using a different timing map. I was making full boost at 3200 and then I changed my timing and now I'm at 27-2800. It doesn't make a big difference what psi I'm running either, rpm is very close to the same.
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Going on heresay is just BS. Yes a dyno spools later than the street, but you can still compare much better than some guys saying I spool mine at XXXX! If the dyno shows one turbo spools 500 rpm sooner than the other one, you will see a very similar difference on the street. That is the significance of the dyno chart. Tune is always going to matter, that is why you don't go off of just 1 dyno chart, but look at several. What gear you are in also makes a big difference.