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Old 03-15-2010, 01:14 PM   #1
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Default Help me select a Turbo

I read the FAQ and a good number of threads. Let me try convey what I am looking for and hopefully someone can help me out.

I have a Locost thats running a 1.8 Miata engine from a 94. Has a LINK ecu on the way.
I have a pretty small nose opening so I cant run a massive IC like everyone here apears to be able to. (I do think I may run 2 small IC's in the side pods but was concerned with pressure drop)

I also dont have tons of space to install the turbo. Its going to be awefully close to my brake system so that makes me think heatshield and maybe Water cooled turbo ?

My goals are simple.
250 rwHP+ above 4000RPM.
I will probably start running E85 when turboed.
I have a stock bottom end, If it dies I will probably add pistons and rods to new block.

I would like smooth power since I already have traction problems

Not sure if I missed anything here but I can add if needed.

Thanks for the help!
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Old 03-15-2010, 04:10 PM   #2
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I've ridden in a Birkin (Lotus 7 copy) and understand your traction problem will be your primary concern. How you expect to control or use 250+whp in that is beyond me. With a stock 1.8 at ~100whp you are already having traction/control issues and since my ride along in one, I believe it.

You will need to stay with a small turbo to keep the power onset as smooth as possible. A gt2554r or maybe a gt2560r (like the one in the for sale section for $400) would be a good match. If you get an efficient 2560 and can keep it working in the most efficient part of the compressor map, you might get close to those goals.

The problem is going over ~230whp typically (but not always) puts you into turbos that come into boost onset more abruptly. There are ways to mitigate that effect a little if you decide to chance it with a gt2860rs or gt2871r, but in a 1200lb car, I wouldn't do it.

As for intercoolers, they come in all shapes and sizes. Look into getting one that is not as tall or as wide but much thicker to give you the necessary surface area and still fit in the nose. Don't overlook water injection as a supplement.
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Old 03-15-2010, 04:33 PM   #3
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Obviously the 2560 I don't think you could keep a 2554 cool enough to run for very long.

First of all if your trying to get smooth power out of that turbo I think you need an ECU that is cabable of using a boost trim map with an electronic boost controller. That will be very usefull in lower gears where you don't need/want as much power.
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Old 03-16-2010, 11:11 PM   #4
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Quote:
Originally Posted by miatamike View Post
Obviously the 2560 I don't think you could keep a 2554 cool enough to run for very long.

First of all if your trying to get smooth power out of that turbo I think you need an ECU that is cabable of using a boost trim map with an electronic boost controller. That will be very usefull in lower gears where you don't need/want as much power.
Thats a pretty cool idea! Thanks. Ill see what I can find!

Still struggling with the turbo decision.
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Old 03-17-2010, 01:07 PM   #5
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A turbo isn't forever. Just buy a smallish turbo like the 2560, and if you don't like it, sell it and buy another one. Swapping them in/out is pretty easy
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Old 03-17-2010, 01:10 PM   #6
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Since space is a concern I'd suggest using water/meth injection for cooling. Since you want really smooth power onset I'd suggest using a larger turbo (2860 or so) and running it at lower boost so it pulls strong but doesn't spike hard. Use an ebc or bcs.
My .02
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Old 03-17-2010, 01:11 PM   #7
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2560r FTW!
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Old 03-17-2010, 01:13 PM   #8
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I would run a PWR barrel air/water intercooler and a front mounted B&M oil cooler as a way to cool the coolant. You'll also need a reservoir somewhere of coolant (the bigger the better).
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Old 03-17-2010, 01:47 PM   #9
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Buy a 2860 and if you don't like it I'll gladly trade you my 2560.
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Old 03-17-2010, 02:28 PM   #10
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Quote:
Originally Posted by dustinb View Post
A turbo isn't forever. Just buy a smallish turbo like the 2560, and if you don't like it, sell it and buy another one. Swapping them in/out is pretty easy
This is true. Space is the concern as is chosing the right flange type that has some interchangability options
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Old 03-17-2010, 02:29 PM   #11
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Quote:
Originally Posted by dustinb View Post
I would run a PWR barrel air/water intercooler and a front mounted B&M oil cooler as a way to cool the coolant. You'll also need a reservoir somewhere of coolant (the bigger the better).
thats what im thinking! Plan to put the radiator in the trunk with the res!
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Old 03-17-2010, 02:30 PM   #12
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I think a t2 is one of the most common flanges out there
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Old 03-17-2010, 02:40 PM   #13
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Quote:
Originally Posted by YeboGoGo View Post
thats what im thinking! Plan to put the radiator in the trunk with the res!
We installed a PWR barrel on an imported Toyota Starlet and it was ridiculous. It was a cool night, but the thing was actually creating condensation on the outside of the charge pipe near the throttle body...

For reference, toyota starlet: (please don't ever buy one)


PWR during fab:


We used an auxiliary water pump from a Volkswagen VR6, they flow really well and easy to install
Parts4vws.com and Parts4Audis.com - VR6 Auxiliary Water Pump
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Old 03-17-2010, 02:44 PM   #14
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Quote:
Originally Posted by dustinb View Post
We installed a PWR barrel on an imported Toyota Starlet and it was ridiculous. It was a cool night, but the thing was actually creating condensation on the outside of the charge pipe near the throttle body...

For reference, toyota starlet: (please don't ever buy one)


PWR during fab:


We used an auxiliary water pump from a Volkswagen VR6, they flow really well and easy to install
Parts4vws.com and Parts4Audis.com - VR6 Auxiliary Water Pump

Basically what I am thinking.

for the iC ( Turbo Water to Air Intercooler Long Flow, 14.5"x5"x4.5" : eBay Motors (item 130320030477 end time Mar-17-10 18:22:38 PDT) ) and the pump i was thinking the ford version from the lightning ($60)

Still trying to make my own intake manifold to make this work
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