Tuning my DR750s on Chrome

[Chris@Rvengeperformance]

Chris, you guys are talking over my head at the moment, but I thought one of your aims was to see how well the DR 750s kept up with the larger displacement.

Can you capsulize your thoughts on that?

yeah that would be nice to see. I think they are going to make huge torque and about the same HP, but at less boost and lower rpm. Probably will be running out of breath by 6500, vs the 16Gs which would probably pull great until 7500. If we are going to continue bench racing I expect to see 20 psi by 3000 easily, maybe lower. Todd so far saw about 50 more hp at 14 psi than I did, so I'd expect near 550 at 21-22 psi. Never going to run them hard enough to see 650 unless ray tunes it for me. Ray expected my old power band to shift down almost 800 rpm. Off boost should be awesome too.

I'm also stock heads and cams, so the 750s should be a little better match really. I'm sure it will respond down low exactly like 9bs or better. Since I am not octane limited I don't see much, if any gains running cams and heads with these turbos on this engine.

On the other hand you can't argue with the silly 750 torque ray has made on 16G/3.5/E85 setup. I can't see that much torque in the 750s on any setup. I just spend a lot of time driving this thing day to day in 1st/2nd gear situations and I know no matter what in those sorts of setups the 750s are going to respond better. Sure, a third gear pull may really close the gap, but that is not most of my driving.

Sorry, that is basically one big long thought and maybe is just repetitive.

Maybe this helps you too, I like turbo setups that you can drive around lazily and they still pull hard all the time. I like something that feels "always on" and you don't really have to be in the right gear all the time.