Turbocharged Locost
10-27-2006, 10:56 PM
#1
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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/
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 10:57 PM. Reason: added link
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10-27-2006, 11:34 PM
#5
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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.
-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.
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10-28-2006, 11:58 AM
#7
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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/
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
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10-28-2006, 03:43 PM
#8
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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
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
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10-28-2006, 04:48 PM
#9
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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.
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.
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10-29-2006, 01:14 AM
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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.
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
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10-29-2006, 07:17 PM
#14
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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.
If you disagree, say why.
If you dont understand, ask questions.
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10-29-2006, 09:51 PM
#15
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.
Fortunately, there is no reason for me to ask questions or state why I disagree.
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10-29-2006, 11:08 PM
#16
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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
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10-30-2006, 04:53 PM
#20
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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
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
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