Chinacharger GT2870 vs Garrett GT2554 with Dynochart
#1
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Chinacharger GT2870 vs Garrett GT2554 with Dynochart
Well, after searching through the forum, I decided that a chinacharger cannot be that bad afterall. Oh well .... Running on the same boost, I lost about 40bhp across my mid range, that's goodbye to drivability.
The only consolation is, the chinacharger cost me 1/3 of a Garrett GT28 but 80% of the performance.
I should have mentioned that car is a 1.6NA miata
The only consolation is, the chinacharger cost me 1/3 of a Garrett GT28 but 80% of the performance.
I should have mentioned that car is a 1.6NA miata
Last edited by nismo502; 12-15-2010 at 01:36 PM.
#2
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Has anyone compared the wheels directly from the china parts to the real deal like I have with the T3 series?
I assume you're running a tiny exhaust? full boost on the 2554 at what looks like 4500RPM?
I assume you're running a tiny exhaust? full boost on the 2554 at what looks like 4500RPM?
#3
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Specs of the chinacharger
Comp H/W(ind) : A/R.60- Ф54.13
Turboine H/W(exd) : A/R.64- Ф46.2
Cooled : Oil/WATER COOLED
Thrust bearing : 360°
Yes, you are right, I am running a 2.5inch exhaust.
Comp H/W(ind) : A/R.60- Ф54.13
Turboine H/W(exd) : A/R.64- Ф46.2
Cooled : Oil/WATER COOLED
Thrust bearing : 360°
Yes, you are right, I am running a 2.5inch exhaust.
#4
This is interesting. And confirms savs theory.
I still want to figure out exactly WHAT is contributing to the power difference in the midrange.
So far we're guessing wheel DESIGN.
Do you have or can you get close up pictures of the compressor wheels on both units?
(and if you posted them already, I apologise cause I can't see pics at work lol)
I still want to figure out exactly WHAT is contributing to the power difference in the midrange.
So far we're guessing wheel DESIGN.
Do you have or can you get close up pictures of the compressor wheels on both units?
(and if you posted them already, I apologise cause I can't see pics at work lol)
#6
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How do you fix the boost down low? its an inherent behavior of the churbo. I played around with ignition but not much difference either.
Sorry I dont have a side by side picture of the turbo, one is on the car, the other is off for a rebuild.
Sorry I dont have a side by side picture of the turbo, one is on the car, the other is off for a rebuild.
#7
While the china turbo may have less lower end you can still up the boost on that thing to 20-25 psi and make a lot more power than that 2554 could ever dream of. Will it ever perform the same as a Garrett 2871? No, but we all know that already.
I would get a 3" exhaust and up the boost.
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I would get a 3" exhaust and up the boost.
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#9
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There's more to a wheel than the inducer and exducer measurements.
For example look at this wheel:
and then this:
you'd be hard pressed to see a difference...
now look at them from the top:
pretty obvious they are different. yet they measure within 1mm of each other. The top blade of the ebay wheel extender further than the garrett and sits even with the lower blade. I couldn't tell you if it's better or worse.
same with the turbine here:
the profile, curve, fin spacing and exducer diameter are identical...I really tried hard to find a difference, but what you will notice is the china wheel has an inducer that's 5mm longer than the garrett. Is that better or worse?
Casting of the CHRA was identical, same AiReasearch "A" stamped on it. thrust bearing looked like it could be swapped with genuine garret parts. Butt dyno told me all was better, dyno proved me right.
So again, has anyone REALLY compared the wheels from the Garrett 2871 to the china?
For example look at this wheel:
and then this:
you'd be hard pressed to see a difference...
now look at them from the top:
pretty obvious they are different. yet they measure within 1mm of each other. The top blade of the ebay wheel extender further than the garrett and sits even with the lower blade. I couldn't tell you if it's better or worse.
same with the turbine here:
the profile, curve, fin spacing and exducer diameter are identical...I really tried hard to find a difference, but what you will notice is the china wheel has an inducer that's 5mm longer than the garrett. Is that better or worse?
Casting of the CHRA was identical, same AiReasearch "A" stamped on it. thrust bearing looked like it could be swapped with genuine garret parts. Butt dyno told me all was better, dyno proved me right.
So again, has anyone REALLY compared the wheels from the Garrett 2871 to the china?
#11
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i am running the blitz EBC. Tried richen the fuel and also tweaking the timing, it makes a bit of difference but it doesnt make up the 0.2bar boost I needed across the mids.
25psi on my stock 1.6? I am a bit skeptical about it.
But thanks guys, meanwhile i am planning to get the exhaust done.
25psi on my stock 1.6? I am a bit skeptical about it.
But thanks guys, meanwhile i am planning to get the exhaust done.
#12
Here is that turbo at 16 psi with an old style begi cast mani and a 2.5" dp on a Mustang dyno.
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#13
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braineack, if i get the chance,i will do the comparison. I am guessing buying a chinacharger is a matter of hit and run. Some are terrific with others have shitty results like what I got.
I am guessing that if I want guranteed performance, I should just take the Garrett route.
I am guessing that if I want guranteed performance, I should just take the Garrett route.
#14
Compressor
Ind53.1mm
Exd 69.7mm
exhaust
Ind 51.7mm
Exd 45.7mm
I apologize for this worthless post if this isn't what you were looking for.
The dyno plot of my churbo follows the red curve int eh first post. Slow to start then takes off like a rocket. Very exponential vs the nice linear curve.
#17
braineack, if i get the chance,i will do the comparison. I am guessing buying a chinacharger is a matter of hit and run. Some are terrific with others have shitty results like what I got.
I am guessing that if I want guranteed performance, I should just take the Garrett route.
I am guessing that if I want guranteed performance, I should just take the Garrett route.
Replace exhaust and up the boost. What mani/dp are you using?
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#20
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