Justifying a 2860RS in my build - Page 3 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 08-02-2009, 12:58 PM   #41
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Being a former 2560 owner, it is all you need for a stock motor, and it is a great turbo. It is fully capable of blowing up your ****. Ask me how I know. And the sweet spot is indeed 15 psi. It really came alive raising it from 12 to 15; it even sounds better.
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Old 08-02-2009, 01:01 PM   #42
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I just want to reiterate:

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Old 08-02-2009, 01:02 PM   #43
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My experience with turbo choice is to choose a turbo that can achieve your hp/torque objectives with about 30hp headroom.

On my 1.6L (with headwork) the 2560 had a 'snappy' response and happily made 260bhp at 16psi. A nice turbo. I moved to a 2860rs (0.86A/R turbine) and it felt sluggish when getting on it, but made 280bhp+ at the same boost level.

Later, the same GT2860rs felt great on my 2L build, 'snappy' again and capable of 320 to 340bhp. Near perfect. For some reason I fancied more power and opted for a custom GT3076r (a blend of the 71 and 76 with a larger ported wastegate) so that I could push for 450bhp, it feels like the 2860RS on the 1.6L, a little sluggish, but makes plenty of power. I'm going to dump it soon and spring for something a little smaller, maybe even go back to the 2860rs. On my daily driver 300 to 350bhp is plenty.

BTW on all these turbos spool was only 200rpm slower (boost vs rpm) on the larger units (at most), so they actually made near the same torque at a given rpm, the larger turbos just didn't feel as snappy when getting on it.

Edit: FWIW the GT3076r spools in 5th gear as follows:
120kPa by 2150rpm
140kPa by 2600rpm
160kPa by 3050rpm
180kPa by 3350rpm

After 180kPa boost rises more quickly.

Last edited by slowmx5; 08-02-2009 at 01:21 PM.
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Old 08-02-2009, 01:17 PM   #44
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Quote:
Originally Posted by CRXican View Post
This thread is a good illustration of the boost obsession. You guys are never satisfied. I understand the love for a specific vehicle ie. the Miata but thousands of dollars for built motors, going through 2 even 3 turbos on the same car. A car worth less than the turbo setup. This is madness! Do what I did and buy an Evo - 19.5psi factory.

Then again, I have yet to pilot a turbo Miata so what do I know?
no, actually I know exactly what I want and I almost got there but had to rethink a couple parts. I went in circles on my turbo vw, but on this car I knew exactly what I wanted from the start and didn't buy too much stuff twice.
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Old 08-02-2009, 02:04 PM   #45
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Quote:
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Do what I did and buy an Evo - 19.5psi factory.
Heavy, slow, etc
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Old 08-02-2009, 02:43 PM   #46
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And the base cost is a shitload more then our build and the car. The Miata's handling is superior to most sedans. Then you want to get new parts for your evo and that **** isn't cheap either.
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Old 08-02-2009, 02:56 PM   #47
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Miata parts aren't as cheap as they should be.

Lightly used Evo parts (stock and aftermarket) are abundant and as a result quite cheap.

You guys are still crazy and I'll keep saying that to keep myself from spending thousands to modify my ugly $3,000 Miata.
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Old 08-02-2009, 03:05 PM   #48
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^ so WTF are you doing in this forum?
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Old 08-02-2009, 03:06 PM   #49
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What is the fun in buying a car that is already fast.. Half the fun is installing the parts, feeling the change. I can buy a good condition Miata for cheap, which gives me extra funds for mods.
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Old 08-02-2009, 03:07 PM   #50
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Thanks, I will spend money on what i want because,
"i wanna go fast" - Ricky Bobby (Talladega Nights)
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Old 08-02-2009, 03:47 PM   #51
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Change his name to TROLLican.

Good deal on a GT2560 in the for sale section.
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Old 08-02-2009, 03:49 PM   #52
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Originally Posted by ZX-Tex View Post
Change his name to TROLLican.

Good deal on a GT2560 in the for sale section.
trust me, I saw it
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Old 08-02-2009, 04:00 PM   #53
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Quote:
Originally Posted by CRXican View Post
Miata parts aren't as cheap as they should be.

Lightly used Evo parts (stock and aftermarket) are abundant and as a result quite cheap.

You guys are still crazy and I'll keep saying that to keep myself from spending thousands to modify my ugly $3,000 Miata.
for the price you spend on track rubber and brakes, I can get the same for my car, a hooker, and a party ball.
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Old 08-02-2009, 04:05 PM   #54
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Quote:
Originally Posted by hustler View Post
for the price you spend on track rubber and brakes, I can get the same for my car, a hooker, and a party ball.
Now that's little a more valid lol.

But...I don't need to invest in a rollbar just to be allowed on the track AND I dont have to try and shoehorn a proper seat in the car since it comes with a PAIR of Recaros...
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Old 08-02-2009, 04:09 PM   #55
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But evos also weigh 2800-3000+ lbs. Little more weight that a little Miata, let alone a race prepped one

Edit*** This has nothing to do with the thread, sorry for the thread jack
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Old 08-02-2009, 04:14 PM   #56
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Quote:
Originally Posted by CRXican View Post
Now that's little a more valid lol.

But...I don't need to invest in a rollbar just to be allowed on the track AND I dont have to try and shoehorn a proper seat in the car since it comes with a PAIR of Recaros...
that's fine, you'll still get skull-fucked by the Cali Miata crew.
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Old 08-02-2009, 04:48 PM   #57
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Quote:
Originally Posted by CRXican View Post
Now that's little a more valid lol.

But...I don't need to invest in a rollbar just to be allowed on the track AND I dont have to try and shoehorn a proper seat in the car since it comes with a PAIR of Recaros...
People like you are a lot of fun to pass on-track.
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Old 08-02-2009, 05:17 PM   #58
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I'm thinking of running a sr20 gt28 since they are so cheap here in japan($50-150). I was wondering what you guys think of this turbo.
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Old 08-02-2009, 05:34 PM   #59
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i think you should mail me a few. seriously
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Old 08-02-2009, 05:54 PM   #60
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170rwhp, **** poorly tuned and I still win.

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