Turbocharged Locost - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


DIY Turbo Discussion greddy on a 1.8? homebrew kit?

Reply
 
 
 
LinkBack Thread Tools
Old 10-27-2006, 11:56 PM   #1
hrk
Junior Member
Thread Starter
iTrader: (6)
 
Join Date: Oct 2005
Location: Atlanta GA
Posts: 335
Total Cats: 2
Default Turbocharged Locost

And so it begins.

Being tired of complaining about terminal speeds on longer straights I found used Garrett GT28R or new name GT2554R ball bearing turbo to help the car. The goal is to have reliable 200-240 rwhp with instant spool and still good at track and autocrosses. Wastegate will be separate 35 mm Tial. Fuel will be fed through 460 cc/min RX-7 injectors driven by Greddy Emanage Ultimate. Intercooler is still open, possibly RX-7 Gen II. intercooler pipes 2" to keep volume and response better.
Head could be 99 which has better flow than previous 96.
Exhaust needs to be remade. Log manifold made out of weld-els and rest of the exhaust should be made from mandrel bent 3" tube.

Critics, comments and suggestions welcome.

hrk

http://russmarshall.com/v/cars/cmc7/power/turbo/

Last edited by hrk; 10-27-2006 at 11:57 PM. Reason: added link
hrk is offline   Reply With Quote
Old 10-28-2006, 12:09 AM   #2
Senior Member
iTrader: (1)
 
Join Date: Mar 2006
Location: Tucson "it's 110" Arizona
Posts: 1,017
Total Cats: 0
Default

Quote:
Originally Posted by hrk View Post
comments
wow.
UofACATS is offline   Reply With Quote
Old 10-28-2006, 12:10 AM   #3
Junior Member
 
Join Date: Oct 2006
Location: Santa Rosa, CA
Posts: 244
Total Cats: 0
Default

First off, great pics, I love the step by step. Hope to do it myself someday.

Seems odd that you'd be this far without an IC.
kyle242gt is offline   Reply With Quote
Old 10-28-2006, 12:11 AM   #4
Elite Member
iTrader: (13)
 
cjernigan's Avatar
 
Join Date: Oct 2006
Location: Atlanta, GA
Posts: 8,147
Total Cats: 6
Default

Where do you live, I want a ride. Or atleast a viewing session so I can gawk.
Less than 1200lbs?
cjernigan is offline   Reply With Quote
Old 10-28-2006, 12:34 AM   #5
Junior Member
 
Join Date: Oct 2006
Posts: 312
Total Cats: 0
Default

Too fancy for your power goals. Ditch the following for savings:
-GT series turbo
-external WG
-99 head

You will be fine with an internally gated T3 60 trim at those power levels. As long as the exhaust is free flowing, there shouldnt be any lag.
beerslurpy is offline   Reply With Quote
Old 10-28-2006, 10:39 AM   #6
Elite Member
iTrader: (5)
 
m2cupcar's Avatar
 
Join Date: Jan 2005
Location: Atlanta
Posts: 7,236
Total Cats: 288
Default

hrk- I have a 99 head and manifold, I'm in Decatur. Don't you have a 1.6 rear in there? - rob
m2cupcar is offline   Reply With Quote
Old 10-28-2006, 12:58 PM   #7
Senior Member
 
Join Date: Mar 2006
Posts: 1,379
Total Cats: 1
Default

Quote:
Originally Posted by hrk View Post
And so it begins.

Being tired of complaining about terminal speeds on longer straights I found used Garrett GT28R or new name GT2554R ball bearing turbo to help the car. The goal is to have reliable 200-240 rwhp with instant spool and still good at track and autocrosses. Wastegate will be separate 35 mm Tial. Fuel will be fed through 460 cc/min RX-7 injectors driven by Greddy Emanage Ultimate. Intercooler is still open, possibly RX-7 Gen II. intercooler pipes 2" to keep volume and response better.
Head could be 99 which has better flow than previous 96.
Exhaust needs to be remade. Log manifold made out of weld-els and rest of the exhaust should be made from mandrel bent 3" tube.

Critics, comments and suggestions welcome.

hrk

http://russmarshall.com/v/cars/cmc7/power/turbo/

The GT2554R is the turbo you want for this application.

Mark
Markp is offline   Reply With Quote
Old 10-28-2006, 04:43 PM   #8
hrk
Junior Member
Thread Starter
iTrader: (6)
 
Join Date: Oct 2005
Location: Atlanta GA
Posts: 335
Total Cats: 2
Default

Thank you for all comments! I do appreciate them.

I have few intercoolers which I'll try to fit into nosecone.
Weight 1420 wet with all safety equipment and 10 gallon fuel cell half full.

I want to overbuild the engine so I can run with minimal boost and thus less heat generation. The car is used in road racing typically for 30 minutes at a time with 75-80% of that time in full throttle. Less pressure and heat means I should be able to finish more often.

I already have 99 head and intake from used motor, thank you.
As well as wastegate.

Thanks for all comments, I am still looking for BOV, vents to atmosphere since I am using MAP already.

Also I have Individual Throttle bodies, but there seems to be varying opinions of usefulness of them in charged motors.

hrk
hrk is offline   Reply With Quote
Old 10-28-2006, 05:48 PM   #9
Junior Member
 
Join Date: Oct 2006
Posts: 312
Total Cats: 0
Default

I think that is way too restrictive a turbine for road racing. Youll get quicker spool, but it will trap a lot of heat in the head.

I honestly dont think your car is going to be falling out of boost with even a far larger turbo. Driving my car under track conditions with my much larger turbine and much less efficient compressor, I am still never out of boost. And I find the T3/T04B too small for street use. Above 120mph the EGTs get too high for my happiness so I'm going for a bigger turbine. Less restriction for the win.
beerslurpy is offline   Reply With Quote
Old 10-28-2006, 06:22 PM   #10
Elite Member
iTrader: (6)
 
Loki047's Avatar
 
Join Date: Sep 2005
Location: Chicago
Posts: 4,145
Total Cats: 0
Default

I have no idea what your talking about beerslurpy
Loki047 is offline   Reply With Quote
Old 10-28-2006, 06:53 PM   #11
Junior Member
 
Join Date: Oct 2006
Posts: 312
Total Cats: 0
Default

You dont know what a turbine is or you disagree with me? Make a substantive response.
beerslurpy is offline   Reply With Quote
Old 10-29-2006, 01:14 AM   #12
Senior Member
 
Join Date: Mar 2006
Posts: 1,379
Total Cats: 1
Default

Quote:
Originally Posted by beerslurpy View Post
I think that is way too restrictive a turbine for road racing. Youll get quicker spool, but it will trap a lot of heat in the head.

I honestly dont think your car is going to be falling out of boost with even a far larger turbo. Driving my car under track conditions with my much larger turbine and much less efficient compressor, I am still never out of boost. And I find the T3/T04B too small for street use. Above 120mph the EGTs get too high for my happiness so I'm going for a bigger turbine. Less restriction for the win.

Well when the HP level is only 200-220 RWHP you should be able to control the EGT's fairly easily. This is not to say that a larger turbo won't work better, but for Auto-x spool can be a critical factor... On a real track, yes, a larger turbo might be the better choice, however the Locost is a lighter car and will likely generate less load (and heat) than the Miata application.

I just hope I didn't go too big with my Turbine.

Mark
Markp is offline   Reply With Quote
Old 10-29-2006, 06:09 PM   #13
Elite Member
iTrader: (6)
 
Loki047's Avatar
 
Join Date: Sep 2005
Location: Chicago
Posts: 4,145
Total Cats: 0
Default

Quote:
Originally Posted by beerslurpy View Post
You dont know what a turbine is or you disagree with me? Make a substantive response.
Ill make whatever ******* response I want. My post was exactly what I wanted it to say, some of your comments didnt make damn sense.
Loki047 is offline   Reply With Quote
Old 10-29-2006, 08:17 PM   #14
Junior Member
 
Join Date: Oct 2006
Posts: 312
Total Cats: 0
Default

You can answer however you want, but youre coming across as a kind of infantile. Or maybe stupid. Your posts are too vague for me to figure out what kind of ******* you are.

If you disagree, say why.
If you dont understand, ask questions.
beerslurpy is offline   Reply With Quote
Old 10-29-2006, 10:51 PM   #15
Elite Member
iTrader: (6)
 
Loki047's Avatar
 
Join Date: Sep 2005
Location: Chicago
Posts: 4,145
Total Cats: 0
Default

You have no idea how infantile I am. Stupid, probably but not about turbos. As for you figuring what kind of ******* I am, Not really my concern but from your posts im gonna guess your not the sharpest tool in the shed so Ill forgive you for not knowing.

Fortunately, there is no reason for me to ask questions or state why I disagree.
Loki047 is offline   Reply With Quote
Old 10-30-2006, 12:08 AM   #16
Junior Member
 
Join Date: Oct 2006
Posts: 312
Total Cats: 0
Default

Quote:
Originally Posted by Loki047 View Post
Fortunately, there is no reason for me to ask questions or state why I disagree.
Except it makes you look like a postwhore who doesnt know anything and is just being contrary for some fickle personal reason.

You've had a turbo on your car for all of a day and 2 psi of boost? You are not quite an expert yet grasshopper.

I put together my own kit and have been running 15+ psi for almost 4 years now. I have done loads of datalogging with different parts and spent years of time staring at the various gauges* as I drive around. I broken stuff and I've found out the limitations of lots of parts- and I've discussed my findings with other miata (and other car) turbo owners for years. Which is where my experience and knoweldge comes from.

I'm not as knowledgable as markp or the other guys who do this sort of thing for a living every day of the week, but I know a hell of a lot more than the average person who is just starting out.

*boost, oil pressure, temp, egt, wb
beerslurpy is offline   Reply With Quote
Old 10-30-2006, 12:28 AM   #17
Senior Member
 
Join Date: Dec 2004
Posts: 1,450
Total Cats: -1
Default

Cat fiiiiiiiggggggghhhhhttttt!!!!!

Rip her shirt offffffffffffff!!!!!!
bripab007 is offline   Reply With Quote
Old 10-30-2006, 11:09 AM   #18
Elite Member
iTrader: (5)
 
m2cupcar's Avatar
 
Join Date: Jan 2005
Location: Atlanta
Posts: 7,236
Total Cats: 288
Default

m2cupcar is offline   Reply With Quote
Old 10-30-2006, 12:04 PM   #19
Elite Member
iTrader: (6)
 
Loki047's Avatar
 
Join Date: Sep 2005
Location: Chicago
Posts: 4,145
Total Cats: 0
Default

haha ya got me, im a postwhore... pretty harsh.

Not really sure why you brought up breaking things, but congratulations (i guess).

Im glad you know more than the average person, not sure why that matters either.

I like learning about you tell me more.

Loki047 is offline   Reply With Quote
Old 10-30-2006, 05:53 PM   #20
hrk
Junior Member
Thread Starter
iTrader: (6)
 
Join Date: Oct 2005
Location: Atlanta GA
Posts: 335
Total Cats: 2
Default

Thanks for comments and amusement too

While I share the concern of having too small turbo, especially turbine side, I'll try to make it's life a bit easier by increasing volumetric efficiency of the motor so I don't have to run high pressures.
I agree with Markp that instant spool is required in autocross. In open track it can be driven around very easily, but not in autocross.
Another thing to reduce heat from turbo is external wastegate, that gas never sees turbo and hopefully help reducing thermal load a bit.
What method would be dependaple way to monitor the heat? EGT? Water and Oil temps?

What can be done if I find this turbine is too small and I could use bigger housings, can they be bolted on or do I need new turbine too with rebalancing.

hrk
hrk is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Fab9Tuning's NC MX-5 Turbo Kit Discussion- EFR/Garrett V-Band FAB Prefabbed Turbo Kits 216 03-22-2017 05:00 PM
Miata new person and a what's it worth! Model192 Meet and Greet 16 09-29-2015 09:50 PM
Noob from Orlando Marcdasharq Meet and Greet 2 09-11-2015 01:21 AM
Noob here, turbo NC project starts now. turboLuigi Meet and Greet 2 09-04-2015 02:29 PM
Megasquirt in Turbocharged Locost hrk MEGAsquirt 4 12-25-2007 10:29 AM


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 02:58 AM.