Rotary shop, specialists, tuner in CO?

[xIceHoundx]

What is the name of the shop in Kansas? Not sure I've heard of that one.

We still meet up in the winter, sometimes every week, or sometimes every other week. But even if we don't have a meet, many of us hang out a lot of the time anyway. Hell, 3 of us live together LOL. Our home is always open to rotary lovers...and Frank I guess HAHAHAHA. Anyway, the meets aren't always with the cars because the weather is not always good enough, but usually when it's not snowing we will still bring the cars out, as long as the roads aren't too bad. It's not as bad as you're probably thinking. We do get hail every now and then, but from what I've seen it's been only a couple times, once in 2008 and another in 2010. We just had some a few weeks ago right before I deployed but it wasn't bad enough to damage cars. And actually the one in 08 I don't think damaged any either. As long as you have a garage and insurance it shouldn't matter anyway haha.

Steve comes out to Denver every now and then to do tuning sessions. Mike B was just saying he was going to come out for someone with an RX-8 and Mike said he was going to try to get him out again next Spring to tune.

The name of the shop out in KS is Jesse Prather Motorsports, their family has been in SCCA racing for years and Jesse is quite successful in it, his shop looks clean and capable, lots of nice cars in the shop as well ive been there when ppl have come with their SCCA spec miatas getting tuned and seen them working on Jesse's FC race car, his miata is also quite a car. Jesse seems like hes very passionate about his work too and his work is quality. Back before I first moved to KS I got on RX7club and asked about shops, much like im asking on here and there about CO, and I was told of jesse's shop and ive seen people mention his shop on other threads too with high reguard. His shop also luckily is in the same town as where my parents live which is nice. He rebuilds, ports, tunes, all that stuff. Had my mother take my car to the shop to have it checked out because I wasnt home she even had nothing but nice things to say about him, ive spoken with him many times in email and visited his shop a few times when I was on mid tour leave and id def trust him with my FD.

[xIceHoundx]

He did say he was planning a gtX35R which is the billet comp wheel compressor...much more efficient design and much better transient response so a GTX35R will spool MUCH quicker than a standard BW S366 and the GTX should be able to move over 500rwhp.



Here is an overlay of the standard GT35R compressor map in blue with the GTX map in red. Notice how much the map is shifted to the right? You'll also notice this compressor can do 75lbs/min at a 2.75PR so it really moves some air. Easily over 500 rotary rwhp and full boost around 3000-3300rpm. An S366 will still be spooling around 3700rpm on a mildly ported REW.

So if he was looking at a standard GT35R I would tend to agree with you, but with the billet GTX35R it's a whole other animal.

Yea I was def planning to run the GTX series 35R, RX7store sells a kit with it for a pretty solid price was planning to pick that up, and from what your saying it sounds like a pretty solid options id be happy with 500rwhp after a good street port and i want to keep lag to minimal, my build is geared towards road coursing

[speedjunkie]

The name of the shop out in KS is Jesse Prather Motorsports, their family has been in SCCA racing for years and Jesse is quite successful in it, his shop looks clean and capable, lots of nice cars in the shop as well ive been there when ppl have come with their SCCA spec miatas getting tuned and seen them working on Jesse's FC race car, his miata is also quite a car. Jesse seems like hes very passionate about his work too and his work is quality. Back before I first moved to KS I got on RX7club and asked about shops, much like im asking on here and there about CO, and I was told of jesse's shop and ive seen people mention his shop on other threads too with high reguard. His shop also luckily is in the same town as where my parents live which is nice. He rebuilds, ports, tunes, all that stuff. Had my mother take my car to the shop to have it checked out because I wasnt home she even had nothing but nice things to say about him, ive spoken with him many times in email and visited his shop a few times when I was on mid tour leave and id def trust him with my FD.

Cool! I've never heard of him but that's awesome. I wish we already had that here haha. There are a few shops around that are good but no one that does JUST rotaries.

I've been comparing the new EFR and the new GTX series turbos, and one thing I was reading looked like they performed about the same. So I'm kinda torn now myself haha.

[xIceHoundx]

Cool! I've never heard of him but that's awesome. I wish we already had that here haha. There are a few shops around that are good but no one that does JUST rotaries.

I've been comparing the new EFR and the new GTX series turbos, and one thing I was reading looked like they performed about the same. So I'm kinda torn now myself haha.

What I like about the GTX series is its already got kits out, doesnt seem like anyone has worked on fitting an EFR series BW yet, and ive seen allot of topics on RX7club with people asking about the EFR turbos and no one seems to have done it yet, and everyone else is waiting for someone else to take the leap and do it so they can get the down low. EFR turbos sound amazing from what the magazines have all said in article but it would likely be quite a bit of custom work for now to fit one up.

Lol well jesses shop does miatas and rotary his shop is literally just down the street from the SCCA HQ and theres an amazing road course track there too, SCCA racing is pretty big out in KS. CO is full of zuppies with subis, I seen Bolder its all richie kids with subarus lol. Not much love for those of us who drive true pure sports cars.

[chickenwafer]

The EFR turbos are awesome, but the main problem is they don't really have any "rotary" sized turbo options. All of them with good sized compressors that are the rotary sweet spot so to speak, similar the popular GT35R (which is actually turbine nomenclature...stupid Garrett), feature tiny tiny turbine housings with small area ratios not suited to rotaries.

So in order to get a rotary sized compressor, you need a rather large turbine and area ratio option, and then the turbo is just too big for 400-450rwhp on a rotary. There is no "perfect match" option on the EFR.

BW designed the EFR's with basically just Evo's and Honda's in mind.

[speedjunkie]

^I don't see how you can't get a good size for the rotary. I don't get it. They have different size ARs and all. You can get at least close can't you? I like that they are lighter (the housings), the wheels are lighter, it has the BOV built in (which can be a blessing or a curse) along with the wastegate if you want (also, blessing or curse) and supposedly the shaft is longer so it's more durable, that's what I've read anyway. Oh, and the ceramic ball bearings. The only thing I wonder about is how the BOV (bypass valve) is recirculating.

Well I will take the plunge on the EFRs to work on fitting them to a rotary, I'm just nervous about it haha. They were telling me I should run a 7670 with a 1.05 AR (which is their only AR size that is divided). At first he told me I should run the 8374 but I told him I'd rather have response. Anyway, I'm really worried it won't fit behind my IC haha. But now that I'm looking at prices for myself, I'm seeing that the EFR would be more expensive than I was originally told. So maybe I'll do like you and get the GTX too. Yeah, I'm a copycat haha.

[chickenwafer]

They may have changed some A/R options for different compressors since I looked at them then. And yes, the CHRA is MUCH longer due to the larger bearing carriers. I can almost guarantee you need a custom manifold.

[speedjunkie]

I don't want to keep hijacking his thread, so I'll email you haha. Actually I emailed you about it yesterday already lol.

[xIceHoundx]

I dont mind the thread hijack its kinda along the lines anyways lol not like anyone has much to say on my topic anymore anyways. Im still thinking because of the ease of use and how much easier it is to find a manifold or kits for the GTX turbos that its what i'll go with. Maybe later down the road I will jump over to an EFR but I think I will wait until people with much more knowledge of turbos that me gives it a run and maybe a kit comes out or something.

[speedjunkie]

Well according to Full Race, the only thing you'd need to possibly change is the down pipe and that's just because of length, and that also depends on which turbine housing you get. It's not like the flanges are different or anything, they're still T3, T4, etc. My concern was whether the compressor housing would be too large to fit between my LIM and firewall, or if it moved forward a bit it would fit fine but then it might start getting too close to the IC to run a properly sized filter. But I'm so close to putting a deposit down on an EFR. I just gotta choose the right size. They first told me 8374, but when I told them I wanted faster spool they said to get the 7670, but honestly reaching 550whp doesn't concern me as much as fast spool so I wonder if the 7064 wouldn't be the best option. As long as it has a divided manifold (all of the larger frame EFRs do) and I don't want the internal WG (which means I have to get 1.05 AR and I wanted to get the .92). Although if I got the internal WG and still used an external, I think that would still work fine and I should have NO worries about boost creep haha.