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Old 01-09-2010, 06:35 PM   #1
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Default Disco potatoe spool on 1.6

Im in the process of making my track car.
The turbo is 2860RS .86 hotside internally WG with EBC
The motor is a stock 1.6L with mild polishing in the exhaust ports.
Intercooler will be CX racing with 2.5" piping.
Exhaust is full 3" with a muffler and tip
Manifold is Absurdflow design.
ECU is MSpnp
Not sure if this matters but 4.10 torsen rear end


Im hoping to start spooling at 3250 and be @ 10 psi around 4250.


I checked the spool data but i didnt know what housing size they had. Anyway just wondering what i could get away with.
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Old 01-09-2010, 07:39 PM   #2
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Considering you ganked Tim's design I will regretfully confess that yes, this turbo will probably spin-up by 4k on that shitty motor of yours. My tater with the .86AR on the ~1.9 with 3" exhaust hits 11.5psi at 3100rpm now. I also have a proper wastegate though, which you don't, peasant.
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Old 01-09-2010, 07:49 PM   #3
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Its a good design what can I say. I give tim credit because he deserves it.
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Old 01-09-2010, 08:28 PM   #4
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I'm pretty sure you're going to see 10psi much sooner than 4200rpm.

And you spelled potato wrong.

Oh and do EWG with a ms2 instead of the pnp so you can use EBC and I bet you spool by 3500.
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Old 01-09-2010, 08:44 PM   #5
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The Dan Quayle patato"e" spelling. I remember!
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Old 01-09-2010, 09:14 PM   #6
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Quote:
Originally Posted by wayne_curr View Post
I'm pretty sure you're going to see 10psi much sooner than 4200rpm.

And you spelled potato wrong.

Oh and do EWG with a ms2 instead of the pnp so you can use EBC and I bet you spool by 3500.
I think 3500rpm on a 1.6 is a stretch. I also seriously doubt an EBC is going to improve spoolage with a proper TiAL wastegate. According to my engineer friend at TiAL the two springs with different free-lengths, different rates, and one preloaded spring is magical.
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Old 01-09-2010, 09:38 PM   #7
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Quote:
Originally Posted by hustler View Post
I think 3500rpm on a 1.6 is a stretch. I also seriously doubt an EBC is going to improve spoolage with a proper TiAL wastegate. According to my engineer friend at TiAL the two springs with different free-lengths, different rates, and one preloaded spring is magical.
Well i'm no expert on turbo sizing and spool so you're prolly right. I swear i remember seeing spool data on some 1.6 T3 setups that was surprisingly quick.
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Old 01-10-2010, 01:12 AM   #8
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That t3 may have had small Comp housing, exh wheel and housing.
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Old 01-10-2010, 11:21 AM   #9
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Here's Jeremy from FM's potato on a 1.6:
http://flyinmiata.com/tech/dyno_runs/Jeremy_potato.pdf

he didn't like it. maybe some intake cam advance would help with low end.
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Old 01-10-2010, 02:35 PM   #10
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I'll post some data in a week when my T3 install is complete. It's a small .42AR with a 50 trim.
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Old 01-10-2010, 03:49 PM   #11
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Quote:
Originally Posted by GeneSplicer View Post
I'll post some data in a week when my T3 install is complete. It's a small .42AR with a 50 trim.
Do that please, I'm interested as well. Chinacharger?
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Old 01-13-2010, 03:12 PM   #12
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Potato on stock engine

Name:  Scan10005.jpg
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Potato on built engine and begi intake manifold

Name:  Miata-dynochart.jpg
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Size:  112.8 KB
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Old 01-13-2010, 03:16 PM   #13
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Quote:
Originally Posted by TURNS101 View Post
That t3 may have had small Comp housing, exh wheel and housing.
Quote:
Originally Posted by GeneSplicer View Post
I'll post some data in a week when my T3 install is complete. It's a small .42AR with a 50 trim.


I have a larger turbine than a disco, older less-efficient compressor wheel design of the same exact size, journal bearings, and a .48 A/R housing (.64 T2X Equivalent) and I can see 16-18psi around 3500rpm in 4th gear...


This compares my ebay T3 50 trim (blue) to my T3 Super 60 (red)
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Old 01-13-2010, 03:20 PM   #14
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I've driven a .86 DP on a 1.6 and I didn't like it either.
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Old 01-13-2010, 08:19 PM   #15
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Quote:
Originally Posted by Savington View Post
I've driven a .86 DP on a 1.6 and I didn't like it either.
Well once i blow up my motor ill build a 1.9L Thanks for the info guys.
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Old 01-13-2010, 09:14 PM   #16
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...i read this after i just bought splitimes disco setup hahaha....
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Old 01-13-2010, 09:23 PM   #17
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Quote:
Originally Posted by shlammed View Post
...i read this after i just bought splitimes disco setup hahaha....
Ignore the naysayers. The miata folk have lived behind other automotive worlds for a long time for a reason
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Old 01-13-2010, 10:24 PM   #18
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Im hoping for full spool (10psi) by 4250. If its 4500 or 5k it will be pretty much completely useless for the track (atleast on a 1.6L). With the manifold design (Thank you Turbotim) and uber 3" non restrictive exhaust and some port matching/polishing on the exhaust side im hoping to achieve this.
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Old 01-13-2010, 10:27 PM   #19
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Quote:
Originally Posted by SKMetalworks View Post
Im hoping for full spool (10psi) by 4250. If its 4500 or 5k it will be pretty much completely useless for the track (atleast on a 1.6L). With the manifold design (Thank you Turbotim) and uber 3" non restrictive exhaust and some port matching/polishing on the exhaust side im hoping to achieve this.
You'll have no trouble making 10psi at 4200. IIRC, the car I drove was making ~15psi at around 4700rpm, which is pretty late IMO. My 1.9L 2871R .86 is more responsive and spools quite a bit better than the 1.6L 2860RS .86 I drove. I've also driven a 1.9L 2860RS .86 and it was significantly better as well.
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Old 01-13-2010, 10:29 PM   #20
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Quote:
Originally Posted by SKMetalworks View Post
Im hoping for full spool (10psi) by 4250. If its 4500 or 5k it will be pretty much completely useless for the track (atleast on a 1.6L). With the manifold design (Thank you Turbotim) and uber 3" non restrictive exhaust and some port matching/polishing on the exhaust side im hoping to achieve this.
Completely useless is pretty extreme. At bremerton I dont ever get below 4500 which is a track that turbo will like a lot.

Did I read that you're going to the Alfa club school?
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