codac Posted August 22, 2022 Share Posted August 22, 2022 Hi all, I have followed this forum for nearly a couple years now and finally thought I'd post something as I'm sure there are plenty doing something similar to what I have. Before I start, it has been pretty bloody awesome being able to build and tune my first car from my garage, literally. There are some really informative post on here, 90% of which I've read in close detail and this has enabled me to undertake the iconic NA to Turbo conversion on my BF XR6. As of now I've retained the NA computer and swapped a BA turbo motor into the car and have been running 10psi on 98 with an NA ION box for the past 3 months without any dramas. I've invested in a wideband and Tuner Nerd knock monitor to assist with tuning on the street as best as I can. Getting a solid pull on the street without spin has been quite difficult so I am sure I have some room to improve but as of now fueling is on point and I'm very confident there is no knock on a full heat soak in this weather. I'll be getting rid of the Turbo motor and running a $400 BA NA motor to see what it's capable of on E85, but mainly it will be set up to daily 98 @ around 7psi. I'll probably just be doing valve springs and pump gears for now as I've seen quite a few people running high 10's and even low 20 psi without even removing the head (stock head bolts and gasket). I'm sure this should be fine as I doubt I'll push any more than 12-14psi. So, my questions for people who have done similar out there, what sort of power figures are people running on NA motors, in particular the BA's (weaker rods but lower compression). I understand there are differences throughout models (BA 9.7:1 and BF-FG 10.3:1 comp, cam lifts, etc), but correct me if I'm wrong, the BA NA and Turbos have the same rods, which is a common fail point from what I understand. I think my plan of attack will be more conservative timing in lower rpm where boost comes on, just to dampen that peak torque spike I'm sure we are all familiar with. I think running stock tyres for a bit of slip through peak torque should minimise the stress on the rods too. Cheers! Quote Link to comment Share on other sites More sharing options...
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