1.6L 205whp;210lb/ft - Miata Turbo Forum - Boost cars, acquire cats.

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Old 05-08-2008, 05:07 AM   #1
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Default 1.6L 205whp;210lb/ft

205.4 whp @ 6200 rpm 210.5 lb/ft @ 4700 rpm 16psi of boost

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what do you think guys? you're the experts

here's the set up:

ENGINE
1600cc in-line four cylinder, 16 valve DOHC Turbocharged and Intercooled
T3 (45v3) roller bearing turbo
Greddy E-Manage Blue
Greddy Pressure Sensor
Aeromotive Fuel Pressure Regulator
460cc injectors (RX7 NA)
Walbro 190lph in-tank fuel pump
HKS Manual Boost Controller
VR4 front mount intercooler
Mazda GTX Blow-Off Valve
K&N air filter
Mazdaspeed Low Temp Thermostat
Custom cold air intake
Custom 3 mandrel bent exhaust
Custom 2 stainless steel mandrel bent intercooler pipes
Custom 8AWG grounding kit


DRIVETRAIN
Limited Slip Differential
Exedy Racing Tri-puck Clutch Disc (ZD11T)
Exedy Racing Pressure Plate (ZC04T)


EXHAUST
HKS Super Dragger 3 Turbo Muffler
Custom 3 stainless full exhaust
Custom 3 stainless flexi-muffler
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Old 05-08-2008, 09:06 AM   #2
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205 @ 16 psi?

Seems like there's a restriction somewhere. Look how the torque plummets after ~4600.
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Old 05-08-2008, 09:34 AM   #3
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Deffinately something holding it back.
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Old 05-08-2008, 09:37 AM   #4
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How did you get the 460cc injectors to work with the Emanage blue?

+1 to the previous posts.

Greets
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Old 05-08-2008, 10:04 AM   #5
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The 45v3 is technically a T28, with the same compressor wheel as me but a smaller turbine....Since it's off an R33 I assume it has at least a .63 a/r turbine. In any case, the boost is either not holding to redline or the turbine is too small.
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Old 05-08-2008, 10:07 AM   #6
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Were you not getting any knock at 15:1 AFR ~3k rpm? That turbo should've been making a reasonable amount of boost at that point... enough to shake up your engine. Your AFR is pretty much a roller coast ride from start to finish.

Here's Arkmage's pull - similar turbo
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Old 05-08-2008, 10:14 AM   #7
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well if you look at his pull. his turbo doesnt even seem to spool untill 3.5k for some reason.
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Old 05-08-2008, 10:20 AM   #8
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yeah, that graph's all sorta of weird. small'ish turbine, spooling late, choking up top... sure there's not a potato in the tailpipe or something? :-)
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Old 05-08-2008, 10:45 AM   #9
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My vote is a boost leak that doesn't open up until the boost comes on really strong.

Double check all your couplers and take another turn on them. I hope you're using T-bolt clamps. Also, source another MBC, swap it in and pull it on the street to rule out the MBC being bad.

That turbo shouldn't have a problem holding 16psi to redline.
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Old 05-08-2008, 11:09 AM   #10
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I don't see any MAP indications... unless it's assumed due to the lack of power on the bottom end. You'd think a boost leak that bad wouldn't be able to produce a peak 16psi.
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Old 05-08-2008, 11:31 AM   #11
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Did you ease it to 3500 or was it wide open? My gt28 isn't peaky like that at all.
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Old 05-08-2008, 12:48 PM   #12
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Is 16 psi really what it takes for us (1.6ers) to get 200 whp? I was hoping less...
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Old 05-08-2008, 12:53 PM   #13
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Quote:
Originally Posted by ThePass View Post
Is 16 psi really what it takes for us (1.6ers) to get 200 whp? I was hoping less...
10-12psi = 200whp

Everyone's setup is different around here. Couple guys got right up to 250 at 15 psi.

Vash-
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Old 05-08-2008, 01:04 PM   #14
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Quote:
Originally Posted by Vashthestampede View Post
10-12psi = 200whp

Everyone's setup is different around here. Couple guys got right up to 250 at 15 psi.

Vash-
cough13psicough.
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Old 05-08-2008, 08:44 PM   #15
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You might want to clear your throat there Braineack. lol
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Old 05-08-2008, 08:46 PM   #16
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Quote:
Originally Posted by m2cupcar View Post
Your AFR is pretty much a roller coast ride from start to finish.
I agree. 15 AFR is getting on the lean side
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Old 05-08-2008, 08:51 PM   #17
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It's lean, but drops just as soon as the boost hits where it could be detrimental.

i still blame the turbine or wastegate control. based on your TQ number I assume you hit 15psi and it instantly dropped to 12 or so.


here's my old 11-12psi run. stock ecu, FMU for fuel, bipes to retard timing.



this was with a really restrictive exhaust.....remember, our turbos are nearly identical. you lost nearly 40tq between 4700 and 6200. I only lost 15.




Actually, what's the 5.8 ratio? That's supposed to match the axle gearing...I assume it was third gear based on the number they have inputted. You would be at 5.72:1 if they do use overall. 1.330 trans and 4.3 final. That will lower the numbers some, but only a few HP.
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Old 05-08-2008, 09:11 PM   #18
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yeah looking again, the spool is nearly identical, but your tq drops. either your 3" exhaust is actually 2" or you need better boost control. But you should not be spooling this late with your exhaust. I spool 1000rpms soon now to the same psi with my 3" exhaust.

check our runs here together, you can see how similar they are, where you hit 15psi, but its obvious it drops off...or something is choked.

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Old 05-08-2008, 11:14 PM   #19
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my guess would be an exhaust leak between the head and turbo... it explains the late spool and the poor flow in the top end
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Old 05-09-2008, 07:49 AM   #20
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thank you guys for all your inputs. I would take a look at the exhaust, maybe its really holding back the turbo...

by the way, the exhaust side of the turbo was divided into 2 chambers, exhaust on the wastegate and exhaust on the turbine like this...

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do you think guys this is causing the hold back?
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