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Old 09-10-2010, 05:47 AM   #21
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You won't be able to affect the turbo or camshaft's characteristics with the ECU, I'm afraid. You can, using an EBC, switch between two maximum boost pressure settings. I thought about this a lot and I'm glad someone told me to just set the boost controller to whatever I consider the "high" setting and just leave it there. You'll have plenty of control over the boost with your right foot.

It sounds like you want a low-mid size turbo (2560 probably) or a Rotrex.
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Old 09-10-2010, 10:11 AM   #22
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Originally Posted by kotomile View Post
You won't be able to affect the turbo or camshaft's characteristics with the ECU, I'm afraid. You can, using an EBC, switch between two maximum boost pressure settings. I thought about this a lot and I'm glad someone told me to just set the boost controller to whatever I consider the "high" setting and just leave it there. You'll have plenty of control over the boost with your right foot.

It sounds like you want a low-mid size turbo (2560 probably) or a Rotrex.
Exactly! Dual maps aren't really advantageous on a street vehicle, but I use an mbc.

I drive at 14psi on my 2560 and if I had an exh bigger than 2" I would have much faster spool. All it means is slowly releasing the throttle as you go up in revs to maintain linear acceleration. That will become as second nature as shifting gears gets.

Even my mom can drive my car linearly and she was used to driving a 5sp v8 Explorer.

I'd like to try out a Rotrex too but the 2560 is a good compromise as far as turbos go.
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Old 09-10-2010, 01:18 PM   #23
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Originally Posted by kotomile View Post
You won't be able to affect the turbo or camshaft's characteristics with the ECU, I'm afraid. You can, using an EBC, switch between two maximum boost pressure settings. I thought about this a lot and I'm glad someone told me to just set the boost controller to whatever I consider the "high" setting and just leave it there. You'll have plenty of control over the boost with your right foot.

It sounds like you want a low-mid size turbo (2560 probably) or a Rotrex.
Then how exactly would one shift the torque curve? with camshaft position i suppose? but thats adjustable cams with two or three bolts I guess.

I wouldnt imagine going anything less than 3" exhaust lol. faster spool is faster spool! But i guess they can get pricey(or your to slammed to fit lol)

I now the 2560 could put around between 190-250 right with being underwhelmed lol.
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Old 09-10-2010, 01:33 PM   #24
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Right, with cam position and/or grind, and the turbo itself (though how the turbo relates to your torque curve is more a spool aspect).

Go with a 3", definitely. I run the Enthuza (stainless) and I'm on the low side for around here. You'll drag it across a speed bump from time to time but it's a sturdy exhaust.

I don't really understand your last statement and/or question.
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Old 09-10-2010, 02:32 PM   #25
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Hey, your the guy I was talking to on m.net. He asked the Tom humpers in the supercharger section what kit he should get lol. When are you gonna holler at BEGI and go over there? Also, your always welcome to make the trip down here and drive my car. Actually, I might be up around San Marcos at some point. Anyways, living in TX and having a turbo miata is pretty much the best thing you can accomplish with your life. I assure you, a 2560 won't make you want for more in traffic.
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Old 09-11-2010, 01:14 AM   #26
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Right, with cam position and/or grind, and the turbo itself (though how the turbo relates to your torque curve is more a spool aspect).

Go with a 3", definitely. I run the Enthuza (stainless) and I'm on the low side for around here. You'll drag it across a speed bump from time to time but it's a sturdy exhaust.

I don't really understand your last statement and/or question.
My statement was more of checking the efficiency range of the 2560 mot likely 190-250whp. Where its not spinning to slow or to fast in efficiency.

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Hey, your the guy I was talking to on m.net. He asked the Tom humpers in the supercharger section what kit he should get lol. When are you gonna holler at BEGI and go over there? Also, your always welcome to make the trip down here and drive my car. Actually, I might be up around San Marcos at some point. Anyways, living in TX and having a turbo miata is pretty much the best thing you can accomplish with your life. I assure you, a 2560 won't make you want for more in traffic.
Yep thats me. I might have some spare time to call this weekend but not really sure when i can go out there. But i got a pretty flexible work schedule Id probably want to see them in the middle of the week. Ill have to snoop around the locals here and see what people have to get a more solid foundation of what i want.
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Old 09-11-2010, 02:32 AM   #27
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I had the same setup (IHI equivalent journal turbo) on another car and it would make 1psi in neutral. Full boost (14psi) was availiable by 2700-2800rpm and starting at 1700rpm. I had a tough time not being at .5 psi on the highway while cruising.
Wait wait wait..

You'd have to be going seriously fast for you to 'cruise' at a positive manifold pressure.
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Old 09-11-2010, 04:08 AM   #28
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I believe it on such a small turbo.

I was cruising in the SRT4 at 5 psi @ 65mph... but I was towing.
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Old 09-11-2010, 02:20 PM   #29
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With constraint i can usually keep to about -10 while cruising at 65-70. But as soon as i tip the right pedal it is boost. If i stomp it in 5th at 65 i usually get about 9-10 psi and illegal velocities.
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Old 09-11-2010, 05:26 PM   #30
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Wait wait wait..

You'd have to be going seriously fast for you to 'cruise' at a positive manifold pressure.
At 120kph or ~3750rpm it would do .1 to .5 psi at <10% throttle. 9.5 CR, head work, IM, big exhaust (relative to the turbo) and a dime, maybe nickel sized wastegate made for lots of creep and a VERY revvy bp. Too bad it was fwd.

Kotomile:

Towing with a neon (turbo or not)? Really? I get harassed for towing with my xcab B3000 because "it can't handle a load safely".
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Old 09-11-2010, 08:47 PM   #31
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if you want a turbo that spools quick took a look out there for old dsm turbos. I had a 13g turbo (first generation automatic dsm turbo) and it could hit 10lbs of boost by 3000rpms. As far as the ecu thing goes, a lot of guys go with megasquirt around here. Thats what im running. And like stated before if you keep your foot out of the gas the car will kinda like a non turbod car lol.
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Old 09-11-2010, 09:13 PM   #32
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With it in that small amounts of boost does that kill gas mileage or no? I figured with the standalones it would already lean out the mixture.
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Old 09-11-2010, 09:51 PM   #33
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On my old car I got 33mpg in town and 30-35mpg highway but it typically was the same mpg or worse than city when on the highway. That was with an MBC set to 15psi.

My miata gets 30-33mpg (with a 6sp and 4.1 rear) and as high at 36mpg on a long highway trip with a bigger turbo (than the above described car), stock engine and exh.

Porting the WG and having ebc that leaves boost at WG level unless you get on it help with unwanted boosting.

You will be fine with a 2560 (again what I'm running now) people make 190 to ~300 (very rare) whp on these with great spool. Just remember your driving a revvy 4cyl not a more tourquey v6. You should only be lean when using a standalone if you tune it that way, I pass Ontario emissions with a MS1.
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Old 09-12-2010, 12:49 AM   #34
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Around town, and without being gentle with the go pedal I get 24-26 mpg in the Miata. On the highway, 30-32 depending how fast I'm going.

With the Jetta...
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Old 09-12-2010, 01:20 AM   #35
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With it in that small amounts of boost does that kill gas mileage or no? I figured with the standalones it would already lean out the mixture.
No, well, apparently i cruise lower than everyone else. The 2854ish turbo in the shanghai kit is not much larger than a 2554. Damn, i wish i would have gotten the 2871ish chinese one. Anyways, once you get a turbo and start boosting, you will give a **** less where your boost threshold is to a certain extent. I wish i had a larger turbo. As long as i have power at about 4k i am good. Anyways, the magic of a turbo, is that it is NA when you want it. I get about 32-36 on the interstate, and city mileage, well this is san antonio, and i hate driving here, so it often involves lots of full throttle stints. The best i have gotten is about 25 in the city usually about 22 ish but that is driver assholism. I run about 15:1 @ -10and below and by 0 I am at 13:1. So that makes for good mileage. I dont pick up any detonation with Jeffs bad *** det cans anyways. I know a supercharger cant make those numbers, plus only raising the intake temp less that 20 degrees over ambient. turbo's are superior to everything in every way. Have you ever seen supercharged F1 cars?
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Old 09-12-2010, 03:11 AM   #36
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ok guys the turbo size has NOTHING to do with psi when in vacuum. This is because of the throttle body, you are measuring air in the intake manifold not on the other side. If you are seing boost while cruising you should check out your car because something is wrong. Simply you have too much load to where you need boost to move your vehicle at 65-70 mph.

i'm assuming the gauge is wired in the manifold like it should be, not on the other side between the turbo and the throttle body.

i got 28mph with the stock ecu hooked up and the waste gate disconnected and almost 32 mpg on the way back with the turbo hooked up and tuned and the car actually ran a tiny bit rich for cruising at 15-10in on my 300 miles trip (avg speed was 70mph all highway)
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Old 09-12-2010, 10:30 AM   #37
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ok guys the turbo size has NOTHING to do with psi when in vacuum. This is because of the throttle body, you are measuring air in the intake manifold not on the other side. If you are seing boost while cruising you should check out your car because something is wrong. Simply you have too much load to where you need boost to move your vehicle at 65-70 mph.

i'm assuming the gauge is wired in the manifold like it should be, not on the other side between the turbo and the throttle body.

i got 28mph with the stock ecu hooked up and the waste gate disconnected and almost 32 mpg on the way back with the turbo hooked up and tuned and the car actually ran a tiny bit rich for cruising at 15-10in on my 300 miles trip (avg speed was 70mph all highway)
Just saying the car was extremely throttle sensitive, and would boost from seemingly no change in input, if I started up the tiniest incline for example. That was the reason I didn't like highway driving it if it was going to rain.
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Old 09-12-2010, 11:24 AM   #38
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Man im so thankful yall have treated me with so much hospitality, I do really appreciate it. My save for supercharger fund has switched gracefully to a new turbo kit in light of new discoveries.
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Old 09-12-2010, 01:10 PM   #39
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i'm running a 2554 hehe i know what sensitive is and you still need to press it to get in boost. Try the cruise control next time, it still should keep you at -10-15 cruising even at 70mph

Kidloco i'm glad you enjoyed your welcome, now bend over :P
turbo kits are very fun but for our nbs are pain in the butt as we dont have any easy ways of getting fuel in that engine. I was thinking the same thing as you and here i am 4k later. I ended up running adaptronic standalone after scaring my self half to death with the xede piggy back.
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Old 09-12-2010, 01:45 PM   #40
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Its ok, he wants a megasquirt.
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