We never actually raced the car competitively, we ran into turbo problems as well as transmission problems since we're only using a Turbo II RX7 transmission, which prevented us from being competitive against the other cars. We did two practice runs, the first one was shut down when Steve realized that he didn't start the data-log... the second one was shut down when the turbo blew up.
We were running a 78mm turbo, which is far too small for the engine and only allowing the engine to rev up to 10,000rpm. Steve is actually leaving the shop right now to go pick up the new Borg Warner race turbo which has a billet machined inconel exhaust wheel. That should allow the car to put down some pretty crazy power this weekend at Cayuga.
We never actually raced the car competitively, we ran into turbo problems as well as transmission problems since we're only using a Turbo II RX7 transmission, which prevented us from being competitive against the other cars. We did two practice runs, the first one was shut down when Steve realized that he didn't start the data-log... the second one was shut down when the turbo blew up.
We were running a 78mm turbo, which is far too small for the engine and only allowing the engine to rev up to 10,000rpm. Steve is actually leaving the shop right now to go pick up the new Borg Warner race turbo which has a billet machined inconel exhaust wheel. That should allow the car to put down some pretty crazy power this weekend at Cayuga.
oh i cant wait to see this....
i really like the idea he had with the intake though ...but it looks like a fu<kin holocaust! way way too many welds!
i think you guys should get the car running good numbers down the track before you change to a bigger turbo!!!
i really like the idea he had with the intake though ...but it looks like a fu<kin holocaust! way way too many welds!
i think you guys should get the car running good numbers down the track before you change to a bigger turbo!!!
Yeah the plenum on the intake manifold wasn't constructed of a thick enough gauge of aluminum, so it ballooned out of shape from the constant pressure of the turbo (up to 24psi). Rather then pulling that plenum off and fabricating a new one, we just patched up the existing plenum because making a manifold/plenum would have taken days. There is a lot of calculation involved in making a proper performing intake system (even though it may not look like it), which is partially why it takes so long to make a new one.
It's impossible to run good numbers when the turbine section of the turbocharger keeps burning up. Rotaries have stupid high exhaust gas temperatures, that's why we are installing a new turbocharger that has a turbine machined from a billet of inconel. Hopefully this new turbine section will withstand the heat and we'll be able to run the engine at WOT without the turbo melting. The turbo we picked up today still isn't big enough, so we're going to run it until the end of the season which is when we'll be able to construct a new manifold and piping for the 100mm turbo we'll have by then.
so we're going to run it until the end of the season which is when we'll be able to construct a new manifold and piping for the 100mm turbo we'll have by then.
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B6T..how did the RX7 run?
you guys are nuts! thats a big ass turbo!
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