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Originally Posted by JonC
(Post 54110)
The k03 falls flat on its face around 200hp (~12psi in a 1.8l Jetta/Audi).
In the grand scheme of things it is a small turbo. Its more just an exercise in fun for me, as my Miata is no-longer my daily driver and I've wanted to do this for years.... just never really had the time to get around to it. So maybe it doesnt spool til 2600 or so, ok. There are plenty of Miatas running around that are just thinking of coming out of vaccuum at 2600rpm. If I wanted instant boost I'd get a Coldside PD blower.... Instead I want something that is neat and different (I'd be what, number three?) and that has turbo whine like no other. Which K03's whine pretty loud... especially with only an aircleaner on them. How will it spool? IIRC the compressor maps for a stock k03 show two of them coming into boost around 2300-2500rpm. I'll have to check when I get home, but it wasnt any number that was absurd like some of the really large turbo miatas that don't come into boost til around 4000rpm. How will it actually spool? Noone has done it yet, so that is yet to be seen. I was always told if you are below 3krpm in a Miata except when stopping you are driving it wrong ;) And I'm talking a parallel setup, not sequential. |
Originally Posted by bripab007
(Post 54118)
On the 2.0T FSI engines, they're topping out around 220-230whp at ~20psi of boost.
Mine are the Pre-'02 K03's which are the smaller ones... but again, we shall see. I'll map it out while I'm at work and see how the numbers work out. |
Aha...see there, I knew those K03s were different, but was not aware they were markedly so.
I'm sure you can get those K03s a heckuva lot cheaper and easier than those small Garretts, too, huh? |
I'll bet the VAG 1.8 head flows a lot better than the Miata head to spool the K03. My opinion, two turbos, a custum funky manifold, lots more piping = more stuff to go wrong. It certainly isn't a budget solution. Would be cool though.
I certainly hope anyone going the TT route has good welding skills or a good friend who does as the manifold itself will be pricey. Frank |
Originally Posted by bripab007
(Post 54129)
I'm sure you can get those K03s a heckuva lot cheaper and easier than those small Garretts, too, huh?
Plus they have round turbine inlets and outlets, so making a flange is not complicated at all, as there is no custom shaping of tubing to make it fit. Add in the fact that it is a water and oil cooled turbo.. more piping, but hopefully longer life. About the only downside is that it is a journal bearing.
Originally Posted by fmowry
(Post 54133)
I certainly hope anyone going the TT route has good welding skills or a good friend who does as the manifold itself will be pricey.
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The original poster was talking about sequential. What the hell are you guys going on about? ;)
I own a 99 base and Im thinking of going turbo... but not just turbo... SEQUENTIAL Turbo... |
Originally Posted by jayc72
(Post 54157)
The original poster was talking about sequential. What the hell are you guys going on about? ;)
Sequentials require all sorts of mechanicals to make them work well. You have to have an exhaust diverter so that you can spool the small turbo up quickly, then you have to have some sort of pre-spool control to get the large turbo to start spooling. You also have to be able to keep the air from the small turbo from flowing into the larger turbo and pushing it backwards or just plain flowing out. The list keeps going. It is doable, but takes a lot of work. |
Originally Posted by JonC
(Post 54110)
The k03 falls flat on its face around 200hp (~12psi in a 1.8l Jetta/Audi). In the grand scheme of things it is a small turbo. Its more just an exercise in fun for me, as my Miata is no-longer my daily driver and I've wanted to do this for years.... just never really had the time to get around to it.
So maybe it doesnt spool til 2600 or so, ok. There are plenty of Miatas running around that are just thinking of coming out of vaccuum at 2600rpm. If I wanted instant boost I'd get a Coldside PD blower.... Instead I want something that is neat and different (I'd be what, number three?) and that has turbo whine like no other. Which K03's whine pretty loud... especially with only an aircleaner on them. How will it spool? IIRC the compressor maps for a stock k03 show two of them coming into boost around 2300-2500rpm. I'll have to check when I get home, but it wasnt any number that was absurd like some of the really large turbo miatas that don't come into boost til around 4000rpm. How will it actually spool? Noone has done it yet, so that is yet to be seen. I was always told if you are below 3krpm in a Miata except when stopping you are driving it wrong ;) And I'm talking a parallel setup, not sequential. Honestly I dont like boost too soon on the miata. If I was making 10psi @ 3000rpm I would be blowing my tyres off . I get 7psi by 3400rpm and 10psi by 3700rpm on my car and it still spins 1st and 2nd ( with 225 wide hancook rs2's in the rear ). I would expect the K03's to hit full boost around 3500rpm in the miata...maybe sooner since they have a very small light turbine in them. My friends Jetta could make 15psi @ 2100rpm with a 3" exhaust so I know they will spool sooner than 4000rpm. |
Originally Posted by fmowry
(Post 54133)
I'll bet the VAG 1.8 head flows a lot better than the Miata head to spool the K03. My opinion, two turbos, a custum funky manifold, lots more piping = more stuff to go wrong. It certainly isn't a budget solution. Would be cool though.
I certainly hope anyone going the TT route has good welding skills or a good friend who does as the manifold itself will be pricey. Frank |
damn
DAmn guys!! FREE FOR ALL???:td:
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Originally Posted by reliabilitygator
(Post 54216)
DAmn guys!! FREE FOR ALL???:td:
A turbo-compounding setup might be easier to do.... just a thought though. |
Originally Posted by AndyFloyd
(Post 54182)
Yeah, but then the VW has a crappy exhaust manifold and restrictive downpipe and its still making full boost around 2000rpm.
And for those that want to know... by the chart, two k03 turbos on a 1.8 miata should have boost onset around 2200-2400rpm, and you can run up to around 20-22psi before choke point (at higher than 2400rpm, obviously). At 4000rpm anything from 8psi - 18psi is right in the most efficent part of the map (73%), and 20psi is only down to 71%. This of course is assuming no pressure drop, standard day, sea level, etc, etc. Which we all know is bullshit. So take it as you will. I'll post the graph when I dig my laptop out. |
Originally Posted by reliabilitygator
(Post 54216)
DAmn guys!! FREE FOR ALL???:td:
Frank |
1 Attachment(s)
As before, standard day, no pressure drop, ideal manifold, etc. It wont perform this well in the car. This is for two k03 turbos, not one. The colored lines are RPM, the points on the lines are 6,8,10,12,14,16,18,20psi of boost.
Enjoy, and please if you see an error point it out. |
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