Artech 1.6 at 10 psi - Page 4 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 07-20-2012, 11:47 AM   #61
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Artech 1.6 at 10 psi-spark.jpg
I said I'd post it up and there it is. What are you opinions of that spark table? I've been running it on my '99 with my SR20 turbo ever since I had MS2. That's the spark table I used when I dyno'd at 225whp.
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Old 07-20-2012, 11:49 AM   #62
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could use a lot more in low boost and a little more in higher levels. unless it blows up.
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Old 07-20-2012, 11:54 AM   #63
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Hopefully the word "turbo" wasn't in the description of the muffler. As strange as it sounds, "turbo" mufflers from the big three (Magnaflow/dynomax/flowmaster) are all chambered.
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Old 07-20-2012, 12:24 PM   #64
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Quote:
Originally Posted by Braineack View Post
could use a lot more in low boost and a little more in higher levels. unless it blows up.
I haven't run my 163,000 mile oil burning engine at over 7psi in the past year and a half, cause I need it to stay running for a couple weeks yet. I am, however, currently working on my spare motor to be swapped in. Let's say I didn't burn oil, because my engine is all brand new...and I could boost 14-15psi without any issues, and I tuned my spark table better...think 250whp could be achieved on that turbo with my catless current 2 1/2" exhaust? I'm only 25whp away, and that was with crappy valve seals/ crappy compression numbers/ 12psi/ etc.
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Old 07-20-2012, 12:34 PM   #65
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on the fresh motor you could definitely run more spark than you do now. and more boost. and probably hit 250. go 3" and make 250 with even less pressure and heat. win win
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Old 07-20-2012, 12:40 PM   #66
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you're retarding ~2 per boost at 8psi. I think that's a bit much is all.
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Old 07-20-2012, 09:03 PM   #67
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Quote:
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my 2.25" exhaust vs. a little porting of the head and a 3" cat/exahaust:


I am shocked by that delta. Was the 2.25" exhaust stock? I have to believe most of that gain came from loosing a chambered muffler and not the diameter of the system. I would love to hear more details of the before and after exhaust systems.

Last edited by k24madness; 07-20-2012 at 09:24 PM.
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Old 07-20-2012, 09:18 PM   #68
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I'd like to hear more also...I believe in eliminating a restriction such as a chambered muffler or a cat...but going from 2.5" to 3" exhaust diameter on a turbo as small as this doesn't seem like it would make a significant difference in freeing up lost power.
Or is this another "thirdgen makes no sense" reply.

Last edited by thirdgen; 07-21-2012 at 12:43 AM.
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Old 07-20-2012, 09:36 PM   #69
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Somebody tell Abe to reply to my PM. I has monies for him.
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Old 07-20-2012, 09:51 PM   #70
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I did about the same on a Mustang. 2.5" exhaust -- pretty quiet. No IC on mine though.

Curious, is your MAT readout F or C (I'm guessing latter)? Was there a fan blowing on your IC? Looks like your IC is heatsoaking quite a bit from the MAT curve.
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Old 07-20-2012, 10:10 PM   #71
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Also, can you post your log and I'll see if I can get a VD graph out of it? 4th gear pull?
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Old 07-20-2012, 10:24 PM   #72
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Dynorun is my 153hp/138ftlb run at 9psi, dynorun2 is my 155hp/148ftlb run at 10psi.
Attached Files
File Type: msl dynorun.msl (389.1 KB, 161 views)
File Type: msl dyno run2.msl (81.1 KB, 103 views)
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Old 07-20-2012, 10:38 PM   #73
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Quote:
Originally Posted by k24madness View Post
I am shocked by that delta. Was the 2.25" exhaust stock? I have to believe most of that gain came from loosing a chambered muffler and not the diameter of the system. I would love to hear more details of the before and after exhaust systems.

max-5 high flow cat 2.25"
chambered borla dual exhaust. 2.25" inlet; dual 2" outlets.
that exhaust on samnavy's t25 setup also produced lack luster results.
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Old 07-21-2012, 12:12 AM   #74
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Quote:
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Dynorun is my 153hp/138ftlb run at 9psi, dynorun2 is my 155hp/148ftlb run at 10psi.
Sorry Curly. I'm a 'tard . VD graphs have to come from street pulls. The calculation takes into account rolling resistance and wind resistance. A VD graph of a dyno pull would not be meaningfull as the only loading comes from the rollers.

Now, if you'd like to do a quick street pull or two, we can see if they agree.
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Old 07-21-2012, 12:38 AM   #75
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Quote:
Originally Posted by Braineack View Post
max-5 high flow cat 2.25"
chambered borla dual exhaust. 2.25" inlet; dual 2" outlets.
that exhaust on samnavy's t25 setup also produced lack luster results.
None of that sounds all that bad. What do you think the bottle neck was?

I have a short 2.5" system on mine. 232whp at 9psi rotrex. Your dyno has me wondering if I have a good chunk of HP being corked up.
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Old 07-21-2012, 02:14 AM   #76
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2.5 flows 25% more that 2.25

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Old 07-21-2012, 10:50 AM   #77
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Quote:
Originally Posted by hornetball View Post
Sorry Curly. I'm a 'tard . VD graphs have to come from street pulls. The calculation takes into account rolling resistance and wind resistance. A VD graph of a dyno pull would not be meaningfull as the only loading comes from the rollers.

Now, if you'd like to do a quick street pull or two, we can see if they agree.
That's 110mph, so no. I'll do a 3rd gear pull.
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Old 07-21-2012, 11:33 AM   #78
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Quote:
Originally Posted by k24madness View Post
None of that sounds all that bad. What do you think the bottle neck was?

I have a short 2.5" system on mine. 232whp at 9psi rotrex. Your dyno has me wondering if I have a good chunk of HP being corked up.
I would expect that a rotrex would not be limited as much by an exhaust restriction; since it is not relying on the exhaust gases to spin up the turbo.
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Old 07-21-2012, 05:17 PM   #79
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Quote:
Originally Posted by k24madness View Post
None of that sounds all that bad. What do you think the bottle neck was?

I have a short 2.5" system on mine. 232whp at 9psi rotrex. Your dyno has me wondering if I have a good chunk of HP being corked up.
that muffler sucked. It's a camaro style muffler if you know how those flow...
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Old 07-21-2012, 05:19 PM   #80
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Camaro...like cross flow style???
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