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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 11-18-2006, 12:59 PM   #21
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Originally Posted by magnamx-5 View Post
oh yeah i forgot you have a smaller compressor for some reason i always though you had a smaller turbine on a greddy coldside. As long as it is fun it doesn't matter
Heck yeah! It's not as if it spools slowly.
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Old 11-18-2006, 03:13 PM   #22
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Originally Posted by AndyFloyd View Post
get rid of that stock exhaust, thats causing a huge restriction.
I know, I know, its in the pipeline. I should start a thread about pipe sizes and muffler configurations.
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Old 11-18-2006, 04:10 PM   #23
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Originally Posted by Mechazawa View Post
I know, I know, its in the pipeline. I should start a thread about pipe sizes and muffler configurations.
Go at least 2.5in. Any muffler will do the job, but if you want a nice mellow tone youll want something like I have a Thermal Muffler. I have a 3" stainless enthuza and love it. I used to have a 2.5in enthuza with a dynomax muffler on my 1.6 greddy setup and i loved the exhaust note..not too loud but slightly louder than my 3" believe it or not.
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Old 11-18-2006, 04:55 PM   #24
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Once you uncork the greddy, it seems like it starts to spool up a lot quicker. I just cut the cat out and did a 2.5" exhaust, and now boost onset is like 2400-2500 rpm. I reach a full 5.5psig at 3200rpm. Just uncork it and it spools up a lot quicker. Ignition timing also plays a huge role in how the greddy runs. I just redid my maps at the same time, and a huge difference.
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Old 12-13-2006, 10:16 AM   #25
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For the guys who didn't list it- are you running a cat?
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Old 12-13-2006, 11:25 AM   #26
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No cat here.
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Old 12-13-2006, 03:18 PM   #27
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Originally Posted by AndyFloyd View Post
No cat here.

Oh, man, you guys with no emissions testing are LUCKY :(
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Old 12-13-2006, 06:33 PM   #28
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GT2560
stock 1.8 longblock
JGS log manifold
38mm Tial wastegate
AEM ECU
2.5' turbo-back exhaust, no cat
4th gear pull
AEM boost control

onset: 1400 rpm
5psi: 2500 rpm
9psi: 3000 rpm
15psi: 3400rpm

From a recent datalog
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Old 12-13-2006, 07:06 PM   #29
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Originally Posted by lukydvll View Post
GT2560
stock 1.8 longblock
JGS log manifold
38mm Tial wastegate
AEM ECU
2.5' turbo-back exhaust, no cat
4th gear pull
AEM boost control

onset: 1400 rpm
5psi: 2500 rpm
9psi: 3000 rpm
15psi: 3400rpm

From a recent datalog
It's nice to have spoolup like that....but dont you want a little more topend power time for a GT3271:gay:
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Old 12-13-2006, 10:01 PM   #30
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Just read a post from Bob B. that swapping his cat for a "test pipe" moved target boost 3071R down 600 rpm. Wow.
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Old 06-01-2007, 04:24 PM   #31
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Back from the dead!

Setup:
Greddy manifold/turbo
Tony 2.5" DP
2.5" Test pipe
2 1/4 spec miata exhaust (12" resonator + muffler)
Home Depot style MBC and helper spring.

2300rpm = onset
3000prm = 5psi
3500rpm = 7.5psi
4000rpm = 12.6psi
4500rpm = 16.7psi (peak drops off to about 15psi)
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Old 06-01-2007, 04:29 PM   #32
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yeah! I knew there was a thread like this.

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Old 06-01-2007, 04:31 PM   #33
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Quote:
Originally Posted by jayc72 View Post
Back from the dead!
2300rpm = onset
3000prm = 5psi
3500rpm = 7.5psi
4000rpm = 12.6psi
4500rpm = 16.7psi (peak drops off to about 15psi)
Wow your spool is like mine. Get your timing situated, and you should be making a tad more power than I am. You might want to drop your boost just a touch though--the td04-15 is just blowin hot air at 17 psi.
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Old 06-01-2007, 04:32 PM   #34
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That is from DLL right? Is there any easy way to have it display min/max for each item in the graph? I see megaview does this and I like it. Can get a good handle on it using the scatter graph I guess.
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Old 06-01-2007, 04:33 PM   #35
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Quote:
Originally Posted by Ben View Post
Wow your spool is like mine. Get your timing situated, and you should be making a tad more power than I am. You might want to drop your boost just a touch though--the td04-15 is just blowin hot air at 17 psi.

16.7 psi isn't by design I need to tweak the MBC a bit, I was shooting for 14-15 psi.
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Old 06-01-2007, 04:39 PM   #36
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microsoft excel baby.

i just pulled the values outta the datalog and graphed boost vs. rpm.
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Old 06-01-2007, 04:43 PM   #37
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Quote:
Originally Posted by jayc72 View Post
16.7 psi isn't by design I need to tweak the MBC a bit, I was shooting for 14-15 psi.
Didn't you get the boost solenoid?
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Old 06-01-2007, 04:46 PM   #38
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Yes I did. But I don't have it working yet. It's the only issue I've yet to resolve with my link, I'm assuming it's the wiring. Moving some of the wires on the stock harness leaves them VERY tight (as you know), I suspect that something has come loose. I've got to pull it all apart and extend a couple of the wires (knock and boost control).

Anyway, the MBC does a pretty decent job.
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Old 06-01-2007, 04:47 PM   #39
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Originally Posted by y8s View Post
microsoft excel baby.

i just pulled the values outta the datalog and graphed boost vs. rpm.
Well aren't a smarty pants.
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Old 06-01-2007, 04:55 PM   #40
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Quote:
Originally Posted by jayc72 View Post
I've got to pull it all apart and extend a couple of the wires (knock and boost control).
When I wired mine up, I ran new wires into the cabin instead of grabbing stock wires by cutting them at the diag box and moving them at the ecu. I wanted my wiring to be "cleaner" than what the FM manual instructed me to do.

I did grab +12v for the boost solenoid from the appropriate pin at the diag box, but I opened up the box and made the connection inside it, then closed the box back up. So it all looks factory, or psuedo-factory at least.
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