Artech 1.6 at 10 psi - Page 3 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 07-19-2012, 12:08 PM   #41
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Quote:
Originally Posted by curly View Post
I'll keep that in mind, i also know how much choked. Exhaust adds heat, I wonder if I should be looking at my cat for cloggage. It's pretty old.
You should be looking at 3". Back when I had the Corrado, the 3" exhaust was the last thing I added. It went from like 380whp to 480whp just from the exhaust, removing the cat, and added spark angle.

I suspect the exhaust is your bottle-neck.
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Old 07-19-2012, 12:33 PM   #42
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I cant read and so i missed the crushed exhaus and resonator

Id say that could accout for 20-30hp. Rest could be timingz.

Btw i wouldnt jack timing without a way to check for knock. This is not the stone age.
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Old 07-19-2012, 12:44 PM   #43
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Yeah 20-30hp would be 175-185, I would NOT be disappointed with that, and could probably find the other 10-20hp to make me really happy with a little fiddling with the MBC and timing.
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Old 07-19-2012, 12:51 PM   #44
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Threads like these make me afraid to get on a dyno, but also more determined to find out what I'm making. What do you guys think about using the dyno software that reads a log to generate a dyno chart? Anyone compare one of those outputs to a real dyno?
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Old 07-19-2012, 12:53 PM   #45
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just strap on a dynojet for realsies.
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Old 07-19-2012, 12:56 PM   #46
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Cat looks ok:



Dunno if you can tell, but there's no melted sections and I can see through it easily. Damn inner diameter is only 2.3". I don't care if the O.D. is 2.5", that's a ------- 2.25" cat if you ask me.

Gotta fix this damn thingy too. Those two center bolts on the timing plate broke off a while ago, it's never scraped until I started it up. Should be an easy fix. Might gut the plate to the bare timing marks. Or just bash it back with a hammer.

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Old 07-19-2012, 12:58 PM   #47
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my 300? cell metal core:






there's maybe like 3-4" at most of length of catalyst.
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Old 07-19-2012, 01:00 PM   #48
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Quote:
Originally Posted by Braineack View Post
metal core 200 cell.

Curly, I have a brand new 3" metal core stainless cat with a little straight pipe on it sitting in my garage. Yours for $120 shipped.


Quote:
Originally Posted by thirdgen View Post
I run 2 1/2" from the turbo back...with no cat. Is 3" really necessary for a turbo that small?
I'll upload my spark table from when I dyno'd at 225whp at like 12psi when I get home.
I'm curious to see your guy's thoughts about it.

The largest and shortest pipe is always best. It will always make a big differene in both spool and overall power.
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Old 07-19-2012, 01:13 PM   #49
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Why don't you just use a test pipe for track days/ everything else, and just bolt a cat on to pass a sniffer???
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Old 07-19-2012, 01:18 PM   #50
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just strap on a dynojet for realsies.
about 3 hours to the closest one .. =(

I will do that though, eventually.
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Old 07-19-2012, 01:34 PM   #51
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^^^ Put that thing on the DynoDynamics in town when you come up for the hillclimb.

Curly, any chance you'd punch your log into VirtualDyno for a comparison?
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Old 07-19-2012, 01:35 PM   #52
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Quote:
Originally Posted by Faeflora View Post
Curly, I have a brand new 3" metal core stainless cat with a little straight pipe on it sitting in my garage. Yours for $120 shipped.
Show me some pics! I'd probably have you send it to Artech for modification. PM some pics!

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Why don't you just use a test pipe for track days/ everything else, and just bolt a cat on to pass a sniffer???
This has been suggested, and it's certainly a possibility. I already jack the car up to bolt my seat in for tracks farther away, undoing two V-band clamps and sliding in a test pipe wouldn't be much more work. The ~$200 cat and 3 v-band clamps wouldn't sit well for only using it once every couple years.

However, since I drive this on the street, I should think of it more like a straight piece of $20 pipe with v-bands that I only use for track days, as the cat would help muffle things.

Actually, ignore the v-bands, cause I'd have to send my dp back to him for modification, and I'm not doing that.

I pm'd artech. I'm pretty sure he hates me.
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Old 07-19-2012, 01:35 PM   #53
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^^^ Put that thing on the DynoDynamics in town when you come up for the hillclimb.

Curly, any chance you'd punch your log into VirtualDyno for a comparison?
Sure, lemme d/l the program. Is it free?
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Old 07-19-2012, 01:37 PM   #54
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Yep, well donation based. Close

http://www.bradbarnhill.com/projects/VirtualDyno/
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Old 07-19-2012, 02:04 PM   #55
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Quote:
Originally Posted by matthewdesigns View Post
^^^ Put that thing on the DynoDynamics in town when you come up for the hillclimb.

Curly, any chance you'd punch your log into VirtualDyno for a comparison?
I like this idea. Where is it located, and who would I contact about it? If it's reasonably priced I may do exactly that. We just put a gt2560 on my brothers s14 and he wants to dyno it as well.
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Old 07-19-2012, 02:25 PM   #56
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Originally Posted by Fireindc View Post
I like this idea. Where is it located, and who would I contact about it? If it's reasonably priced I may do exactly that. We just put a gt2560 on my brothers s14 and he wants to dyno it as well.
PM'd to end the threadjack
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Old 07-19-2012, 03:48 PM   #57
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Show me some pics! I'd probably have you send it to Artech for modification. PM some pics!
Looks exactly like this, but without the flanges.

NA, miata, mx5, racing, cat pipe, off road, stainless steel

Probably costs you around 10 HP at 200hp level.
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Old 07-19-2012, 11:24 PM   #58
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Cat converters are for homosexuals and women. I didn't compare to a dyno, but I went from 11.5-11.8AFR on ramp runs when I removed the cat converter from my car. That's more air, son.
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Old 07-20-2012, 01:10 AM   #59
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There's a good chance that the muffler shop who made the crush bent exhaust also used a chambered, not straight through, muffler. Add that to the list of bottlenecks.

You have pm.
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Old 07-20-2012, 01:15 AM   #60
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Quote:
Originally Posted by Faeflora View Post
Looks exactly like this, but without the flanges.

NA, miata, mx5, racing, cat pipe, off road, stainless steel

Probably costs you around 10 HP at 200hp level.
I think I'll take it, dunno if it's being sent to Artech or not yet.

Quote:
Originally Posted by matthewdesigns View Post
Yep, well donation based. Close

Virtual Dyno
Yeah, I can't get it to work. Won't accept my MLV logs.

Quote:
Originally Posted by ARTech View Post
There's a good chance that the muffler shop who made the crush bent exhaust also used a chambered, not straight through, muffler. Add that to the list of bottlenecks.

You have pm.
Lies! I has no PM.

I bought the muffler myself, it's a magnaflow straight through design, specifically for turbo cars.
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