PROJECT ND: Parts Development, Testing, Measurements, DYNO

Miata Parts, Intakes, Superchargers, Headers, Exhausts, Shocks, Springs, Sway Bars, Brake Kits, Autocross and track mods.

Re: PROJECT ND: Parts Development, Testing, Measurements, DY

Postby Brian » Sun Nov 12, 2017 5:57 pm

Fun first competition day with the AVO Turbo ND...it took the class by storm with two drivers (Sean and I) trading best times through the day. More download later, four hours of sleep and exhausted, will post the pics for now.
Attachments
TurboND.jpg
NDTurbo3.jpg
NDTurbo2.jpg
Brian Goodwin
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Re: PROJECT ND: Parts Development, Testing, Measurements, DY

Postby Brian » Mon Nov 13, 2017 2:38 pm

More on Autocross yesterday. Turbos and Autocross have always been an interesting mix, fun and challenging. With a supercharged autocross Miata like our 2007 I like to throttle steer through the course, around cones, precision use of every inch of the course is possible and rotation around features with all the extra power is an easy flick of the throttle. It is very different with the turbo.... dial up the power and then focus more on just roughly hitting my apex marks and otherwise keeping it somewhere between each side of the course. Placing it inches to the cones while trying to summon full TURBO power carries far more risks of stepping rear out and slapping that cone beside you. And so it was yesterday that Sean and I both did our best times in morning practice, in afternoon competition we both did our best times in our first 'warm up' run, and we both seriously slapped some cones during our subsequent runs. Great fun, perhaps even more fun to race than the supercharger, but also a lot more like a shotgun than a sniper riffle. With the supercharger in the car for the last event my challenge was just figuring best use of the power curve, control and placement of the car within the confines of the cones was not a challenge. But hey, at the end of the day our newly TURBO ND was fastest Miata by several seconds, beat all the BMWs too at this BMW CLUB Autocross event.

Now time to applaud the San Diego BMW CLUB. If within reach of San Diego, my TOP pick for Autocross big fun is the BMW Club. Their course designs are a mix of traditional autocross and full on race track. Yesterday included a double U turn that was so tight you had to get down to almost walking pace, but you were then rewarded with expanding radius full acceleration through two gears long downhill sweeper that sent our Turbo high into third gear and the tires just trying to hold on as the speed grew....onto the next rise and slam the breaks and catch the twitching car as you enter a Slalom. Will post video soon. So much Fun, such a great course, kudos to all involved!

As for COOL BOOST, happy to report that with two drivers flogging the car back to back our radiator temps were stable even as we regularly set and reset top time. Oil was still warmer than I want, broke 230 F despite massive oil cooler. We had challenges with cooland and oil temps at Laguna and that led to cutting the grille, though we have upped our oil cooling game per the prior posts after Laguna, we have now added an oil heating boost mechanism...the turbo itself...that makes our oil cooling challenge even higher than before. As time permits will make some more additional refinements to our cooling scheme.
Brian Goodwin
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Re: PROJECT ND: Parts Development, Testing, Measurements, DY

Postby Sean @ GWR » Thu Nov 16, 2017 2:06 pm

At the last event I got behind the wheel of our Project Race ND it had our Edelbrock Supercharger installed. Hopping in the driver's seat this time the AVO turbo kit would be force feeding the engine.

Right off the line I noticed a bigger surge in power once you hit ~3000RPM and the pull to redline was stronger than before. Very little lag was present but if you were off the power band you always had to anticipate the onset of power during the lower speed corners. On a big track this would be less of an issue and you would be in the sweet spot of the power band. However, like Brian said, no matter what you do the turbo will always be a bit more unpredictable than a supercharger and it makes hunting the apex more risky.

I knew the turbo would provide excellent sound suppression but I was still surprised just how quiet our RoadsterSport Race muffler with Max mid-pipe was. I am a big fan of quiet exhaust systems so this was music to my ears and kept my fatigue levels lower at the end of the day. The exhaust still had plenty of character snapping and popping at redline when rowing through the gears. The turbo on the other hand was very quiet and you might not realize it was turbocharged unless you were told.

The additional aero and tires also made for a FUN day at the autocross trading top time of the day with Brian until I hit a cone! Now the big question...which did I like better? At the end of the day I think it all depends on the application. For a street only car the Supercharger is the answer for me. For an all our track weapon give me the turbo and all the boost.

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