DIY Turbo Discussion greddy on a 1.8? homebrew kit?
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Greddy td04 spool time

 
Old 03-02-2019, 03:55 PM
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Default Greddy td04 spool time

Since i cant find much in the spool thread thought id ask here. Turbo is the greddy td04 with kraken manifold and 2.5inch downpipe and single resonator, no cat or muffler.

After blowing up the stock 1800 with wrx td04 in my nb1 a couple months ago ive finally got the new replacement 1600 running and tuning it, which came with the above turbo setup. Ive got it holding 14/15psi to redline which is nice but it seems to spool pretty bad, worse than id expect for the turbo size, even for a 1600 vs 1800.

Does this look right? or do i have to play with when it holds the wastegate closed a bit, im not really sure how that works besides guess and check. Since my open loop control is pretty solid im guessing i can use those values to start on tuning closed loop? will that help the low down at all?

Or is this just all normal 1600 stuff?

attached msl file.
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File Type: msl
2019-03-02_15.25.02.msl (58.0 KB, 10 views)
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Old 03-02-2019, 04:13 PM
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Am I reading this right? U replaced a 1.8L with a 1.6??

1.6 is hurting spool and turbo is likely not as efficient in spooling.

Closed loop will maybe give you 100-200rpm sooner spool. MAYBE
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Old 03-02-2019, 04:30 PM
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Yes, I bought a built 1600, turbo, manifold, act clutch and fly, 550cc injectors, m-tuned fuel rail for same price it was going to cost me to buy a 1800 shortblock, aftermarket rods and pistons and get it machined to fit. And selling my old turbo/manifold/injectors and not having to replace my worn clutch and fly makes it a good option for my budget, as ive just replaced the 6 speed after blowing that up as well. And wway easier to find replacement parts in NZ as 1800s are less common, which is important for a somewhat race car.

I know it wont be as good as the 1800, but im just wanting to see if im maximizing what I do have. And not blowing up another gearbox.


12psi 1800 tdo4h V 15psi td04-15g 1600
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Old 03-02-2019, 06:00 PM
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At 217tq you shouldn't be really blowing up 6 speed boxes.

Might be just bad luck with the last gear box.
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Old 03-02-2019, 06:26 PM
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Originally Posted by borka View Post
At 217tq you shouldn't be really blowing up 6 speed boxes.

Might be just bad luck with the last gear box.
It's a virtual Dyno plot so who knows how accurate the actual numbers are, was not heat to compare curves. It might be closer to 230 which smashing gears in a race track could quite easily cause issues .
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Old 03-03-2019, 09:59 AM
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Something is up somewhere. Even your 1.8 wasn't.spooling that well. This is my 1.6 with a Kraken and a Subaru TD04L-13T with a 2.5" downpipe to an ebay OBX 2" cat back using a 2" test pipe with no transition.



My friend's 1.6 with greddy kit has 14psi by 3.2k when it isn't leaking. He has an Artec greddy replacement manifold and full 3" turbo back with only a resonator.
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Old 03-03-2019, 02:43 PM
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Maybe my timing map is a bit conservative?
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Old 03-04-2019, 09:40 AM
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Maybe? This is what I am running.


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Old 03-04-2019, 11:42 AM
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My 1.8 with TD04-13T spools a touch faster than's X-25's. Very similar. IIRC, can see 15 psi at 3000 - 3300.
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Old 03-07-2019, 09:40 PM
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The 15g greddy supplies it's laggy. It's nothing like the 13t from a WRX. It has a larger exhaust housing. I ran a greddy 15g many years ago. 15psi I made 227hp/217 tq on a dynojet. I would hit full boost in 4th gear around 3800-4100 depending on how the weather was. So honestly you aren't going to get it to spool much better. If you put in a 13t from a WRX you'll see a 500rpm spool improvement.
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Old 03-07-2019, 10:07 PM
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Originally Posted by andyfloyd View Post
The 15g greddy supplies it's laggy. It's nothing like the 13t from a WRX. It has a larger exhaust housing. I ran a greddy 15g many years ago. 15psi I made 227hp/217 tq on a dynojet. I would hit full boost in 4th gear around 3800-4100 depending on how the weather was. So honestly you aren't going to get it to spool much better. If you put in a 13t from a WRX you'll see a 500rpm spool improvement.
Sweet, if thats what i can expect out of the turbo then thats cool, just making sure i wasn't doing something wrong. As laggy as the graph looks, you don't notice it at all once you're up in the revs its fine.

Any idea if I can push it past 15psi or is it getting out of its efficiency?
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Old 03-07-2019, 10:28 PM
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You can run it up to about 18psi before it's pretty much tapped out. It flows 428cfm it should be good for 250-265whp at Max.

Originally Posted by adamost.nz View Post
Sweet, if thats what i can expect out of the turbo then thats cool, just making sure i wasn't doing something wrong. As laggy as the graph looks, you don't notice it at all once you're up in the revs its fine.

Any idea if I can push it past 15psi or is it getting out of its efficiency?
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Old 03-07-2019, 11:11 PM
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Sweet, just seeing what headroom ive got in time attack if i need to pull a couple tenths out of the hat for a placing.
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Old 03-07-2019, 11:14 PM
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It's a pretty decent turbo besides the lag. Like you said though once you are over 4k it's pretty instant. I really loved my greddy setup back in the day the way that turbo spools makes the car feel faster than it is because it hits a little late but ramps up really quick once it gets going.

Originally Posted by adamost.nz View Post
Sweet, just seeing what headroom ive got in time attack if i need to pull a couple tenths out of the hat for a placing.
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Old 03-11-2019, 05:18 PM
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Originally Posted by x_25 View Post
Something is up somewhere. Even your 1.8 wasn't.spooling that well. This is my 1.6 with a Kraken and a Subaru TD04L-13T with a 2.5" downpipe to an ebay OBX 2" cat back using a 2" test pipe with no transition.



My friend's 1.6 with greddy kit has 14psi by 3.2k when it isn't leaking. He has an Artec greddy replacement manifold and full 3" turbo back with only a resonator.
Seems about right for a 1.6

This is my 1.8 with a full 2.5" catted exhaust, more boost but softer timing in the mid range. I str
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Old 03-11-2019, 05:22 PM
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Little bit of colder weather on the weekend caused boost spiking to 18psi @ 4000rpm which is a bit better haha.
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