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Old 02-07-2008, 12:22 PM   #41
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Joe isn't saying a Miata can't win, just that an normally aspirated one won't. It's going to take either a supercharger or a turbo to get it done.
No, he had it right. I was pretty much saying that a Miata can't win SM2. Maybe someone will prove me wrong, but the Z06 and the high-strung RX7 are formidable competitors.
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Old 02-07-2008, 12:22 PM   #42
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shawn, if anyone i think you have a pretty good shot with your set up
id really like to make it down to topeka one year but would not even consider it without a set of 275 A6's
as far as you making up the .66 sec i think you will have no troubles at all
from my experience, i know the most significant upgrades are your tires and suspension, you're already there, now just get used to the extra power and you will be very dangerous out there

ps-i envy your set up (sans FI)
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Old 02-07-2008, 12:29 PM   #43
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also, when competeing in SM2 nationaly, you just pray that the ZO6's hit cones on each run, lol (inside joke that prolly only i get on this forum)

but regionaly, i compete on azenis and a decent suspension set up, still NA :(
but i do win frequently even when FI cars are present, but i have been killed by an LS1 RX7 and a ZO6 on hoosiers like damn, thats why i wont even think about going to topeka until i get 275's and boost
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Old 02-07-2008, 12:34 PM   #44
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snip
Personally, I look at it this way- if I was serious about autoX, then I wouldn't drive a FI Miata. It's just never going to win. In fact, the day that an NA takes the top spot at Topeka in SM2, I will eat my turbocharger.
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Originally Posted by Joe Perez View Post
No, he had it right. I was pretty much saying that a Miata can't win SM2. Maybe someone will prove me wrong, but the Z06 and the high-strung RX7 are formidable competitors.
Thank you for the vote of confidence
There are three or four cars I know of around the country who are going to give it a pretty good shot.

How about you eat the BOV if one of us wins in San Diego? I will bring the good beer.
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Old 02-07-2008, 12:34 PM   #45
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No, he had it right. I was pretty much saying that a Miata can't win SM2. Maybe someone will prove me wrong, but the Z06 and the high-strung RX7 are formidable competitors.
Well that's the last time I'll try and speak for you!
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Old 02-07-2008, 01:39 PM   #46
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Thank you for the vote of confidence
There are three or four cars I know of around the country who are going to give it a pretty good shot.

How about you eat the BOV if one of us wins in San Diego? I will bring the good beer.
Mmmmm. Good beer.

Ok, maybe I'm being a bit harsh here to mask my own insecurity about sucking rather badly.

In all honestly, I'm really looking forward to seeing what happens this year, with your car and with the rest of the NAs on the new Hoosiers. With that new Uber, you're definitely on the right track, so to speak.
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Old 02-07-2008, 01:56 PM   #47
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Mmmmm. Good beer.

Ok, maybe I'm being a bit harsh here to mask my own insecurity about sucking rather badly.

In all honestly, I'm really looking forward to seeing what happens this year, with your car and with the rest of the NAs on the new Hoosiers. With that new Uber, you're definitely on the right track, so to speak.
I'm not upset and it wasn't really harsh. And you certainly didn't underestimate the capabilities of those other car types. It should be an interesting year. I don't think I am quite there with the car yet, I need another winters worth of work to get it where I would like it to be. Then a few years of driver training.

I will bring the beer whether you have to eat the BOV or not.
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Old 02-07-2008, 04:29 PM   #48
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Jay first off no one is perfect. I would not need christ if i were.

2- He was asking about a set up for autoX, turbo or not, best thing to know is how competitive he wants to be. If he wants to be really competetive then regardless of sm2 or not power is not the first thing he needs. How much expereince does he have. These all factor in. Like joe says its going to be hard to beat SM2 corvettes etc. The new hooiser might give us a chance but we have not seen yet. Also course differe depending on region. Some are small and tight, others more open. Having more than one turbo might be better, or an ecu that can store multiplemaps to spool differently. Setting up a turbo that is right for autoX is not as simple as i want to go fast and have X amount of power.
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Old 02-07-2008, 05:00 PM   #49
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Dont listen to the nay sayers. No one thought a Miata could win in ES over the MR2s, but I guess I proved that wrong this year. I do think a SM2 Miata can win with the new tires available. My friend Jeremy Schuster was 4th I think in '05 running on skinny 225s and would have been a definate threat had the 275s come out sooner. It is too bad he gutted his car and turned it into a track only car. I may run some in SM2 this year, but in a '93 RX7 that I am helping my best friend build. We will be putting the motor together this weekend.
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Old 02-07-2008, 05:09 PM   #50
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i have a 13g in my car, just the stock wastegate on it. i put a bigger fitting right into the compressor housing and i am seeing 7psi on my boost guage. for auto-x i think it would be perfect turbo. in first with my 205-50-15s, it wont spin unles you jab the gas and want it it spin. i would like to raise the boost to 15ish psi and see how it is. it feels a little slow in the higher gears, but then again the only other turbo car i have ever drove was an STI and my old v6 probe with a t3/t4.
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Old 02-07-2008, 08:49 PM   #51
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thanks bryan for your input on the 13G.

Braineack I see what you're saying about the T25 and its definitely a good choice for someone wanting to upgrade to bigger hp numbers later on. In the dyno graphs you posted there still is no advantage over your T3 in the lower rpms right?

I did some research today and also came up with a third choice over the 15G and 13G: the TD04-13T found in the 02-06 WRX. This is a comparison of the three turbos:



I think the 13T is evenly matched in the mid-range, but its efficient even past 7000 rpm @ 12psi. Even on the turbine side it has to be flowing much better than the 13G and 15G cause it supports like 230 hp stock.

Some guys on this forum have also run this turbo with much success.

So with a little bit of hunting around I picked this up for $130 today:







Not bad huh...its from a 06 WRX!! Sure the flanges are a little mickey mouse and this means it wont be the cheapest option after all, but hey, its the perfect fit and what I've been looking for all along, atleast in theory.

What are the bottlenecks I can expect during the build?

I have scoped out a shopping list:

Turbo - TD04-13T

Manifold - JGS stage 2 kit with turbine inlet flange cut from a WRX up-pipe.

I/c tubing size - TBD

Wastegate - 13T stock

Fuel Injectors - Stock Supra

Downpipe - TBD. <--- This is going to be the tough part.
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Old 02-07-2008, 09:49 PM   #52
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Originally Posted by The_Pipefather View Post
Braineack I see what you're saying about the T25 and its definitely a good choice for someone wanting to upgrade to bigger hp numbers later on. In the dyno graphs you posted there still is no advantage over your T3 in the lower rpms right?
it's really only because i have a 3" exhaust now and headwork.

here's a better comparison. Same manifold/dp/exhaust, stock block. 12psi.

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