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Old 09-13-2009, 06:54 PM   #1
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Default Help choose a turbo

I've decided to go the chinacharger route. My limited turbo knowledge is making the decision difficult because I have know clue as to what performance to expected based upon the different compressor wheel values. Please help. I am pretty sure that I will follow levnubins route with this turbo since it seems to be closer to a 2871:

Turbo charger Drift T28 GT2860 SR20det KA24de S13 S14:eBay Motors (item 200381756402 end time Sep-14-09 23:42:14 PDT)

but, How will this turbo respond?

GT28 GT2870 Turbo Charger internal wastegate .86 A/R:eBay Motors (item 200381524992 end time Sep-14-09 08:11:02 PDT)

My new engine is a 1.8, will have forged internals, 99 head, 550cc injectors, and a lot of other things recommended on this site.
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Old 09-13-2009, 06:55 PM   #2
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what is ur goal?
what are u doing with the car?
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Old 09-13-2009, 07:09 PM   #3
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My goal is very loose at the moment. 300+ is what I'm thinking. Initially 300, but it seems like the more power i make the more I want. I'm trying to build a track car that I drive on the street. (As retarded as that sounds) It will see only a couple of track days a year. I will also state that I have never been in a 300 whp miata so all of this "want" is pretty much talking out the ***.

My 2554 spools like crazy then falls on it's face. I want a lot more mid to top end punch. I don't need it to spool like the 2554, but I'm sure I don't want to count off five seconds before the power comes on.


Finally:

The most petty thing that I need to achieve is the ability to really surprise people in higher end sports cars on the highway

I guess it will probably be best to choose the one that will offer the best all around driving experience.
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Old 09-13-2009, 07:18 PM   #4
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2860
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Old 09-13-2009, 07:21 PM   #5
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Thanks, I looked at the compressor map for the 2871. (what the ebay 2860 actually approximates) It appears that 300hp - 350hp is still in the efficiency range.

I don't realistically see going over 350hp

ebay 2860 appears to be best choice, but I hope that others still chime in with their facts/opinions.

Thanks
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Old 09-13-2009, 08:07 PM   #6
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not trying to thread jack, but i'm looking for a chinacharger as well. my goal isnt quite as lofty though. i'd like to make 250whp, and have it spool up fairly quickly. my car is strictly street driven, ~3k miles a year.
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Old 09-13-2009, 09:19 PM   #7
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Quote:
Originally Posted by DrewLGT View Post
not trying to thread jack, but i'm looking for a chinacharger as well. my goal isnt quite as lofty though. i'd like to make 250whp, and have it spool up fairly quickly. my car is strictly street driven, ~3k miles a year.
I would look at the ebay store from the links above. They seem to have good customer service from what I hear, and a 1 yr replacement warranty on the turbos. Not bad for 300 shipped new. oh, I would bet that a 2560 would be consensus for your turbo choice.
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Old 09-13-2009, 10:32 PM   #8
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Originally Posted by djp0623 View Post
I would look at the ebay store from the links above. They seem to have good customer service from what I hear, and a 1 yr replacement warranty on the turbos. Not bad for 300 shipped new. oh, I would bet that a 2560 would be consensus for your turbo choice.

this is as close as i could find to a garret 2560, it seems to be a little bit smaller though.

T25 Turbo Charger internal wastegated Mazda Miata MX-5:eBay Motors (item 200382311246 end time Sep-16-09 13:54:07 PDT)

anyone have this chinacharger?
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Old 09-13-2009, 11:52 PM   #9
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The first turbo seems similar to what I'm running now. Todays data log shows post starting after 3000 rpms, and 6psi or so right around 6000. Now I have no run the car again since tightening the actuator arm, or cranking down the clamps on the induction and exhaust. Also consider this is straight downpipe nothing else at the moment.
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Old 09-14-2009, 10:23 AM   #10
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u need a boost controller ^
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Old 09-14-2009, 10:59 AM   #11
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u need a boost controller ^
I'm already looking.
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Old 12-03-2009, 12:04 AM   #12
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Default China 3071

I've been set on the ebay 2860 (which seems to spec to a 2871) from my initial post, but now I have been reading about how good the spool is on the Garrett 3071. Has anyone run across a chinacharger that specs the same as one of these 3071 turbos. Based on dyno charts it doesn't seem like the spool difference between the particular 3071 being discussed and 2871 is much different.
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Old 12-04-2009, 09:29 AM   #13
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Quote:
Originally Posted by djp0623 View Post
My goal is very loose at the moment. 300+ is what I'm thinking. Initially 300, but it seems like the more power i make the more I want. I'm trying to build a track car that I drive on the street. (As retarded as that sounds) It will see only a couple of track days a year. I will also state that I have never been in a 300 whp miata so all of this "want" is pretty much talking out the ***.

My 2554 spools like crazy then falls on it's face. I want a lot more mid to top end punch. I don't need it to spool like the 2554, but I'm sure I don't want to count off five seconds before the power comes on.


Finally:

The most petty thing that I need to achieve is the ability to really surprise people in higher end sports cars on the highway

I guess it will probably be best to choose the one that will offer the best all around driving experience.
Highway (surprising those high end sports cars).. you'll want that 300 rwhp.

Normal use.. I bet you'd be happy with 260-270 and a 2860 spool.
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Old 12-04-2009, 10:13 AM   #14
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Thanks just trying to get everything in order now that my motor is getting ready to come back from the machine shop.
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Old 12-04-2009, 10:26 AM   #15
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tubular manifold? It makes a huge difference. I'm talking almost 1000rpm improvement on target boost threshold and output.
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Old 12-04-2009, 10:55 AM   #16
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Quote:
Originally Posted by hustler View Post
tubular manifold? It makes a huge difference. I'm talking almost 1000rpm improvement on target boost threshold and output.
I'd like to see THIS happen when I go tubular with my 2560R.

To the OP, you could get very close to your stated goal of 300 wheel with the little 2560, with a bit better spool, if the engine build is optimized. Ref the NE dyno day thread for a couple of guys doing just this. Granted, not the norm for this turbo, but possible. You will really exceed your goals with the 30R. Flame away.
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Old 12-04-2009, 12:03 PM   #17
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Quote:
Originally Posted by hustler View Post
tubular manifold? It makes a huge difference. I'm talking almost 1000rpm improvement on target boost threshold and output.
I've got a new Begi cast manifold in the garage. A tubular manifold just didn't fall into the build budget. 1000 rpm is very significant gain in spool. I only thought a 300-500 rpm change would be what a person would see going from a good cast manifold to a tubular.
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Old 12-04-2009, 12:10 PM   #18
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Quote:
Originally Posted by Newbsauce View Post
Highway (surprising those high end sports cars).. you'll want that 300 rwhp.

Normal use.. I bet you'd be happy with 260-270 and a 2860 spool.
You are probably right. One nice feature I am seeing with my new ecu that is nice: The ability to tune the boost to the throttle position. I could keep the boost fairly tame except for the last 5% of throttle position.
I rarely ever go to full throttle on the street. Just a thought
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Old 12-04-2009, 12:27 PM   #19
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Quote:
Originally Posted by djp0623 View Post
I rarely ever go to full throttle on the street. Just a thought
Then you need to man up and start burning some gas
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Old 12-04-2009, 01:28 PM   #20
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Originally Posted by Newbsauce View Post
Then you need to man up and start burning some gas
Probably a bit tongue in cheek, here.

But, seriously, I'd love to see someone here post a tps histogram that shows any meaningfully high frequencies above the tps>50% bins in street driving. This person will either be dead or in jail. Just sayin...
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