Compound boost: EFR 7670 into Coldside FFS W/ H20/Meth into 10.5:1 VVT Built Engine - Page 6 - Miata Turbo Forum - Boost cars, acquire cats.

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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 07-18-2013, 03:46 PM   #101
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Originally Posted by concealer404 View Post
Is 87mph in the 1/8 mile special? My daily driver does that, and i'm pretty sure it's not making the 350whp claimed, and it's heavier than a Miata.
87 is the fastest he's been, apparently. the current setup traps 83.

Then there's this guy with an ebay manifold, trapping 93 in 1/8 and 118 in 1/4....
https://www.miataturbo.net/dynos-tim...y-turbo-72172/
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Old 07-18-2013, 03:57 PM   #102
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That sounds much better.
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Old 07-18-2013, 04:01 PM   #103
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Quote:
Originally Posted by concealer404 View Post
Is 87mph in the 1/8 mile special? My daily driver does that, and i'm pretty sure it's not making the 350whp claimed, and it's heavier than a Miata.
Assuming the cars weighst about 2400lbs, trapping at 87mph would mean...
232 whp
I used this calculator: Wallace Racing HP Calculator For 1/8th Mile
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Old 07-18-2013, 04:04 PM   #104
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Originally Posted by Full_Tilt_Boogie View Post
I used this calculator: Wallace Racing HP Calculator For 1/8th Mile
Assuming the cars weighst about 2400lbs, trapping at 87mph would mean...
232 whp
The wallace racing calculators assume you make a bit more torque than the average 230hp miata.
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Old 07-18-2013, 04:05 PM   #105
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Torque doesnt matter.
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Old 07-18-2013, 04:21 PM   #106
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I give up. I haven't posted ANY dyno or any HP numbers. On m.net I said plus or minus 50 whp. I also said estimate. And I said its cutting out. And I can't find 3 rd at the track. Why does everyone care so much about this? And take everything out of context. Makes no sense. Not even good trolling when you take everything out of context. As said new setup only went 83 mph in the 1/8, not 87!
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Old 07-18-2013, 04:24 PM   #107
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Originally Posted by concealer404 View Post
Time out.




Is 87mph in the 1/8 mile special? My daily driver does that, and i'm pretty sure it's not making the 350whp claimed, and it's heavier than a Miata.
Damn ninjas...
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Old 07-18-2013, 04:35 PM   #108
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Originally Posted by SleeperMX-5 View Post
Why does everyone care so much about this?
because you're pretty much pioneering this and we want data
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Old 07-18-2013, 04:42 PM   #109
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Quote:
Originally Posted by soviet View Post
because you're pretty much pioneering this and we want data
I'll share all the data I get. I'm going to quit responding to all the crap post though. I would much rather discuss HOW to make it work than argue about what color an intercooler should be.
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Old 07-18-2013, 04:47 PM   #110
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Quote:
Originally Posted by SleeperMX-5 View Post
I'll share all the data I get. I'm going to quit responding to all the crap post though. I would much rather discuss HOW to make it work than argue about what color an intercooler should be.
***** flesh color.
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Old 07-18-2013, 06:49 PM   #111
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I'd be happy with virtual dyno pulls, do one and see how the car is running now for a baseline.
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Old 07-18-2013, 07:25 PM   #112
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I just read through your thread on Miata.net. Is the fastest MPH you have gone 83.2 in the 1/8th? I saw a reference of 87 MPH but I could not find documentation that you have gone that fast.

Anyway if I may, lets start with the set-up you are currently running. You mentioned that you are going to keep your AFR in the 9's. If you think you are doing this to keep your motor healthy, you are kidding yourself. If you continue to run it like that, you can kiss your cylinder walls goodbye. I recommend that you get your AFR to the tried and trued setting that so many have had success with.

The next thing I would do is make sure you have all your spark issues corrected. You never mentioned the heat range of your plugs. With the turbo you are running, I would go 2 steps colder. Also, you said you were playing around with plug gap. I would stick with between .025 and .030 gap. If you are still having issues with spark, then you need to address the ignitions components.

Then I would work on your timing. If you are smart, you will run race gas at the drag strip until you are confident in your tune, even if you are planning on a conservative pump gas tune. This will give you a margin of safety just in case you make a mistake somewhere.

I would not even consider doing a turbo/supercharger hybrid until you have done all the above. You may find that your priorities change when the car actually runs right. If it were me, I would ditch the blower and use nitrous as your spooling/off the line fix. It is much easier, and has been proven to work.

My
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Old 07-18-2013, 08:28 PM   #113
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Originally Posted by miata2fast View Post
I just read through your thread on Miata.net. Is the fastest MPH you have gone 83.2 in the 1/8th? I saw a reference of 87 MPH but I could not find documentation that you have gone that fast.

Anyway if I may, lets start with the set-up you are currently running. You mentioned that you are going to keep your AFR in the 9's. If you think you are doing this to keep your motor healthy, you are kidding yourself. If you continue to run it like that, you can kiss your cylinder walls goodbye. I recommend that you get your AFR to the tried and trued setting that so many have had success with.

The next thing I would do is make sure you have all your spark issues corrected. You never mentioned the heat range of your plugs. With the turbo you are running, I would go 2 steps colder. Also, you said you were playing around with plug gap. I would stick with between .025 and .030 gap. If you are still having issues with spark, then you need to address the ignitions components.

Then I would work on your timing. If you are smart, you will run race gas at the drag strip until you are confident in your tune, even if you are planning on a conservative pump gas tune. This will give you a margin of safety just in case you make a mistake somewhere.

I would not even consider doing a turbo/supercharger hybrid until you have done all the above. You may find that your priorities change when the car actually runs right. If it were me, I would ditch the blower and use nitrous as your spooling/off the line fix. It is much easier, and has been proven to work.

My
Thanks for the advice. I have no intention to run 9.5 AFR once everything is right. Only did that because of high comp and high aits to be safe. It will run 11. Something in boost when sits are in check.

I did buy a new ignition system so yes, that's getting fixed ASAP.

I have 2 heat range cooler race plugs going in too.

And yes, I'll be getting everything sorted before compounding. I don't wanna b old another motor if I don't have to. That head wasn't cheap and took a while to build.
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Old 07-18-2013, 08:32 PM   #114
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What camshaft are you using?
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Old 07-19-2013, 02:48 AM   #115
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Quote:
Originally Posted by soviet View Post
because you're pretty much pioneering this and we want data
"Pretty much" being the key part of that statement:






It really comes down to this. The SC is going to create some mechanical losses, as we all know, but will allow for more aggressive tuning as long he uses the turbo to make most of the boost and keeps the SC spinning slowly where its efficient.
Attached Thumbnails
Compound boost: EFR 7670 into Coldside FFS W/ H20/Meth into 10.5:1 VVT Built Engine-3291570028_large_zpscd2b6f00.jpg   Compound boost: EFR 7670 into Coldside FFS W/ H20/Meth into 10.5:1 VVT Built Engine-3291570018_large_zpsad36994c.jpg  
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Old 07-19-2013, 02:50 AM   #116
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Besides that pic(s) posted all the time I have yet to see a build thread on that car or shared results and testing and what it even put down, etc.

So if Pat actually documents and shares with us his whole journey (which he intends to, whether its win or fail), he will pretty much pioneer this.
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Old 07-19-2013, 03:02 AM   #117
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True. although its been done plenty with other cars, even with pretty similar components, such as the god awful M45 poopercharger.





Quote:
Current tune:



We also tried bypassing the SC to see what effect it has. Here is a turbo only curve at 16psi. Looks like typical shape for a turbo plot. Drivability would suffer at the lower rpms on the track.



And at the same boost level a comparison with twincharge. Torque curve is flattened out and wider by about 1000rpms.

Its a balance between parasitic loss of the supercharger and higher IATs post SC'er without an intercooler, and greatly improved scavenging.
What wins out? Its hard to say.
Attached Thumbnails
Compound boost: EFR 7670 into Coldside FFS W/ H20/Meth into 10.5:1 VVT Built Engine-img_9400.jpg   Compound boost: EFR 7670 into Coldside FFS W/ H20/Meth into 10.5:1 VVT Built Engine-4707622075_86160dec0a_b.jpg   Compound boost: EFR 7670 into Coldside FFS W/ H20/Meth into 10.5:1 VVT Built Engine-bypasspowertq.jpg   Compound boost: EFR 7670 into Coldside FFS W/ H20/Meth into 10.5:1 VVT Built Engine-16psipowertorque.jpg  
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Old 07-19-2013, 08:13 AM   #118
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Quote:
Originally Posted by 18psi View Post
So if Pat actually documents and shares...
that's funny.
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Old 09-23-2013, 01:16 AM   #119
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Oh look,
this thread.
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Old 09-23-2013, 12:25 PM   #120
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Quote:
Originally Posted by 18psi View Post
So if Pat actually documents and shares...
that's funny.

Still mildly entertaining.
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