95R street car project
03-07-2014, 10:12 AM
#141
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It was a Mazdaspeed short shifter. It was basically the same overall length as the OEM (so it didn't move the shifter closer to the wheel or anything) but it moved the fulcrum up. End result was that effort increased, distances between the gates got minimized and, because of the increased effort, you really didn't shift any faster (which isn't much of a limitation on a 5-speed anyway). Felt like a money-shift setup to me -- and, since Mazdaspeed sells crate engines, that makes sense. LOL.
The discussion on the long/angled Roadstersport shifter in the other thread has me intrigued though. But, honestly, I've never been unhappy on track with the OEM 5-speed shifter.
The discussion on the long/angled Roadstersport shifter in the other thread has me intrigued though. But, honestly, I've never been unhappy on track with the OEM 5-speed shifter.
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07-16-2014, 09:04 PM
#143
I'm going through the engine on my Red car to fix an oil consumption issue (rings never seated after last rebuild by PO).
Just noticed that you did Supertech 11:1 but shaved them to reduce the compression ratio. Right now my engine has the 2001 pistons, but I was thinking about Supertechs to get the extra point of compression. Now, I'm like "hmmmmm . . . ."
Was that just a concession to CA91? Or was there a performance/longevity reason?
Just noticed that you did Supertech 11:1 but shaved them to reduce the compression ratio. Right now my engine has the 2001 pistons, but I was thinking about Supertechs to get the extra point of compression. Now, I'm like "hmmmmm . . . ."
Was that just a concession to CA91? Or was there a performance/longevity reason?
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07-16-2014, 09:21 PM
#144
I'm going through the engine on my Red car to fix an oil consumption issue (rings never seated after last rebuild by PO).
Just noticed that you did Supertech 11:1 but shaved them to reduce the compression ratio. Right now my engine has the 2001 pistons, but I was thinking about Supertechs to get the extra point of compression. Now, I'm like "hmmmmm . . . ."
Was that just a concession to CA91? Or was there a performance/longevity reason?
Just noticed that you did Supertech 11:1 but shaved them to reduce the compression ratio. Right now my engine has the 2001 pistons, but I was thinking about Supertechs to get the extra point of compression. Now, I'm like "hmmmmm . . . ."
Was that just a concession to CA91? Or was there a performance/longevity reason?
It's oxygenated, farm raised, free range, vegan and made from all organic ingredients. Depending on the build, we have struggled to hit MBT in every cell at 11.0:1 so we just dial it back. With coated chambers or small cams like an NA8, it's easier to do. Get it breathing with an NB head and a bit of porting/chamber work and you'll see 105kpa at 5500rpm. Too much cylinder pressure for the coors light we call gasoline out here. Jelly of all the states with 93 where you can safely run 11.0:1 with careful tuning.
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09-02-2014, 11:38 PM
#145
Deviate
We just dropped in a 1.9L built race engine, our +2 exhaust CNC head, Tomei cams, ceramic thermal coated chambers/crowns/valves, exhaust ports and of course, that C30-74 Rotrex from Jackson Racing. ID1000's, on E85. We're aiming for 300whp+. We will be giving rides in it this weekend at MRLS. Renamed it "Deviate". Seemed appropriate as we deivated from the cars original mission to exemplify a simple N/A HPDE build, plus it is a mischievous car with instant boost.
Rushing to get it tuned and ready for MRLS so we're leaving a few things undone. Will update in the coming weeks
Rushing to get it tuned and ready for MRLS so we're leaving a few things undone. Will update in the coming weeks
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09-03-2014, 10:49 AM
#153
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Very nice.
What diameter nose pulley is that? I notice many ribs on that belt ... details on the crank pulley? I've had several people inquire about my setup, and I use the 80mm 4 rib pulley which Skunk2 no longer produces. Attempts by them to use the 4 rib belt with the higher rib count nose pulleys that are available have resulted in the belt walking around.
What diameter nose pulley is that? I notice many ribs on that belt ... details on the crank pulley? I've had several people inquire about my setup, and I use the 80mm 4 rib pulley which Skunk2 no longer produces. Attempts by them to use the 4 rib belt with the higher rib count nose pulleys that are available have resulted in the belt walking around.
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09-03-2014, 01:03 PM
#157
IMAG0044_zps5652fd19.jpg?
IMAG0047_zpsd038a282.jpg?
You missed the 40mm wastegate with vband flange welded onto the squaretop right next to it.
Nope. That's the production location but with a slightly larger filter. We'll add some heat insulation on the intake piping next to the header. In practice, we see very low IAT's so it's more to make the silicone couplers happy. On a purpose built track or autocross car, one could relocate and shroud the filter.
Very nice.
What diameter nose pulley is that? I notice many ribs on that belt ... details on the crank pulley? I've had several people inquire about my setup, and I use the 80mm 4 rib pulley which Skunk2 no longer produces. Attempts by them to use the 4 rib belt with the higher rib count nose pulleys that are available have resulted in the belt walking around.
What diameter nose pulley is that? I notice many ribs on that belt ... details on the crank pulley? I've had several people inquire about my setup, and I use the 80mm 4 rib pulley which Skunk2 no longer produces. Attempts by them to use the 4 rib belt with the higher rib count nose pulleys that are available have resulted in the belt walking around.
This is the proprietary SuperMiata steel crank damper and aluminum overlay pulley we will offer for the kits. It is configured as an overlay so the S/C loads are fed directly into the steel hub, not the damped steel outer ring. This allows the damper ring to do it's job just it does in an N/A application.
The belt centerline of the the JR Rotrex is different that pretty much all other S/C kits so this is a JR Rotrex only setup. We will have these special S/C dampers available for about $600 when the production S/C kits begin shipping in a few months.
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09-03-2014, 01:07 PM
#158
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I didn't realize John had a Miata. Needs something to drive when the 928 goes all Porsche on him?
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09-03-2014, 01:14 PM
#159
Actually, why have a wastegate with a supercharger? It's not like we're trying to keep the turbo spooled. Are you using it to protect components around the intake from being overpressurized? And what are the rubber hoses around the wastegate? Something to do with CARB? There seems to be a lot of stuff here that I'm not familiar with. It's pretty cool.
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09-03-2014, 01:27 PM
#160
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My Rotrex had a BOV in front of the throttle body for the same reason a turbo has a BOV in front of the throttle body. Its the back of the manifold that has me screwed up.
The Rotrex does its best work in the upper RPM range, so spinning the hell out of it is actually beneficial provided you are under the -74's 120,000 RPM redline. The problem is that you may actually be moving more air that you want/need. You don't want to compromise things with a restrictor at the compressor, so bleeding off the air (like a wastegate bleeds off exhaust) makes some sense. You still have flat boost response at WOT and you keep the blower in its efficiency range without blowing things up.
So I'm guessing its some sort of epic boost control. It's been discussed in the past, but I've not seen it implemented. I bet it'd be loud as ****.
I'm probably totally wrong though
The Rotrex does its best work in the upper RPM range, so spinning the hell out of it is actually beneficial provided you are under the -74's 120,000 RPM redline. The problem is that you may actually be moving more air that you want/need. You don't want to compromise things with a restrictor at the compressor, so bleeding off the air (like a wastegate bleeds off exhaust) makes some sense. You still have flat boost response at WOT and you keep the blower in its efficiency range without blowing things up.
So I'm guessing its some sort of epic boost control. It's been discussed in the past, but I've not seen it implemented. I bet it'd be loud as ****.
I'm probably totally wrong though
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