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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 02-24-2007, 08:39 PM   #1
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Default diy 1.6 turbo questions

i am thinking about boosting my miata to get a little more power out of it. i a;ready have a fmu, 255hp fuel pump and a 6 puc clutch. i was going to just get the manifold, downpipe, and bov off of ebay. a friend of mine has a stock 1g mx6 front mount i am going to get and i was going to use a 14b or t25 from a DSM. retard the base timing to 6 deg and thats it. and i have a 12:1 disk in the fmu now, but looks like everyone runs a 8:1, so i will need to get another disk.

i will probaly upgrade later on, but just want a simple, basic setup for now. i have megasquirt on my probe, so i will probally just build another one for the miata and get bigger injectors and raise the boost later on.

does it sound like i have everything planed out ok so far?
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Old 02-24-2007, 09:05 PM   #2
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manifold, downpipe, and bov off of ebay... You need to be more specific. There is a lot of terrible junk out there and those are pretty important parts.
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Old 02-24-2007, 09:29 PM   #3
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just ssac stuff. i am running there stuff on my probe and everything works perfect. if the mani cracks, i will just weld it

edit: like this

Last edited by bryantaylor; 02-24-2007 at 09:42 PM.
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Old 02-24-2007, 09:36 PM   #4
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go nuts!
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Old 02-24-2007, 09:59 PM   #5
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have fun.
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Old 02-24-2007, 11:38 PM   #6
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Quote:
Originally Posted by VRTSid View Post
go nuts!
Translation, "Good luck!".

Just buy the greddy kit. You'll be up and running in no time with minimal problems and straight forward upgrade paths.
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Old 02-24-2007, 11:46 PM   #7
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IMO the 3 most important things in a turbo kit are:
The Turbo
The Manifold
And Engine Management
You get what you pay for my friend. Dont buy shitty eBay stuff.
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Old 02-24-2007, 11:55 PM   #8
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Quote:
Originally Posted by getsidewaysd1 View Post
Dont buy shitty eBay stuff.
Seriously, it won't be worth the continued pain in the ***.
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Old 02-24-2007, 11:58 PM   #9
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Quote:
Originally Posted by rotaryjunky View Post
Seriously, it won't be worth the continued pain in the ***.
Shoot, anything bad happens, a whole new set of parts is only $170 :gay:
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Old 02-25-2007, 12:07 AM   #10
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Quote:
Originally Posted by Ben View Post
Shoot, anything bad happens, a whole new set of parts is only $170 :gay:
Might as well buy a bunch of them at the start!

All that is shiny isn't worth the s/h. Works great for a civic exhaust, though! (OBX)
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Old 02-25-2007, 05:19 AM   #11
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i have been runing ebay turbo, wastegate, bov, intercooler, and pipes on my probe for a couple of years now with no problems. the problem most of the time with the ebay stuff is not the parts, it the person using it. and i am not going greddy, i would rather peice my own together
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Old 02-25-2007, 05:28 AM   #12
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dude you megan raicng haters suck, if braced and done righ the can make big power on it. It is the same **** i started with. So all you Haters
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Old 02-25-2007, 09:12 AM   #13
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By all means, go for it. Just be completely honest of your experience so we can learn from it, good or bad. Honestly, I hope its good. And pics too.
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Old 02-25-2007, 01:58 PM   #14
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First, you've read through this right?
https://www.miataturbo.net/forums/showthread.php?t=4288

Overall, looks like a good start for about 7-8psi.
With stock injectors, even with the 255, you'll run out of fuel after that, and with just 6* of static timing, I wouldn't run any more than that. Brain might tell you it's OK to run a little more if he's up for some calculations.
Have you sourced an oil feed/drain line yet? How do you plan to route?
Most of us peform a fuel rail mod to make it dual-feed.
You can skip the 02 clamp if MS in definitely in your future.

I ran the .48/.49 DSM for awhile and had a huge boost overshoot problem... granted I was spiking to almost 18psi, but you can expect to spool by 2000rpm's with 8psi by about 3000rpm... and then a smooth decline to a steady 6psi to redline. The cure seems to be to port the wastegate hole or engineer a helper spring. I'll have the results of my new .80/.64 T25 next week.

I think you'll want to look into heat shielding with the top-mount manifold. I'm thinking about melted brake reservoirs! If you're handy with the welder, some sheetmetal stock will do fine. Just look through the VBGarage for ideas. There's also a turbine-blanket in the group buy section.

My biggest piece of advice is to do it right from the start. I cheaped out on my initial build and have been playing catch-up for 6 months. It souds like you've got some prior turbo experience and some decent shop skillz, so you know what I mean. Do us a favor, fill out your profile, signature, and throw up some pics in the vbGarage. It'll help when you want advice. Where are you located, there might be some locals around to help out in person! You definitely came to the right place. Keep us informed.
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Old 02-25-2007, 05:13 PM   #15
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thanks for the post man. this isnt my first turbo car, i built up my other car in my driveway. but i have never messed with FMUs and stock injectors. i was just going to use the port on the block for the feed and tap the pan like in the FAQ for drain. and i know mitsu turbos are water cooled and from the pic of the oil drian, it looks like i would just tap into the coolant line under the manifold for the water.
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Old 02-25-2007, 05:54 PM   #16
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Did anyone catch that he wants to use a DSM turbo? Isn't the DSM flange different from the standard SR20 T25 flange most of us use?
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Old 02-25-2007, 05:57 PM   #17
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he has the megan racing stuff in mind and mentiions DSM turbos i dont see a contridiction. check his hyper link.
+ no where in this thread has he mentioned the use of a nissan t25
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Old 02-25-2007, 07:14 PM   #18
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yeah, i thought that the ebay manifolds where the mitsu flange?
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Old 02-25-2007, 07:49 PM   #19
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Quote:
Originally Posted by bryantaylor View Post
yeah, i thought that the ebay manifolds were the mitsu flange?

You are correct.

I have it, it fits. Sorta. Nothing you can't handle though. It sound like you know what you're getting into, so as long as you realize the limitations of the parts you're building with, knock yourself out.

As for the water, yes just tap into the coolant line.

Get a 190hp.

As S(p)amnavy said, I too cheaped out on my build, except I really cheaped out. All I can think about now is starting over. YMMV. Best of luck
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Old 02-25-2007, 08:20 PM   #20
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thanks for the help guys. also what spark plugs is everyone running? i really like to run NGK v-powers, just get one colder?
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