Help me pick a turbo (Non Miata)
#1
Junior Member
Thread Starter
iTrader: (9)
Join Date: Apr 2007
Location: Hanover, MA
Posts: 237
Total Cats: 0
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
I知 trying to pick a cheap turbo for another vehicle out team is bringing to the GRM challenge. Time and money have kind of changed our plans and I知 now looking at cheap ebay T3/T4 turbos. This is not going on a Miata. The engine is a 4.0L that makes peak power at 4750 RPMs with a redline of 5250. Our goal is about 325 hp and I知 thinking that 10 psi on a 50 or 57 trim T3/T4 should work. Now looking at the 2 compressor maps the 50 trim looks like a more efficient turbo even though it痴 smaller. Here are 2 images from squirrel performance to give you an idea. The lines on the maps might be off a little since I was only trying to get a rough idea.
![](http://www.squirrelpf.com/turbocalc/graph.php?version=4&pr0=1&pr1=1.07&pr2=1.41&pr3=1.75&pr4=1.75&pr5=1.75&pr6=1.75&pr7=1.75&airflow0=4.5&airflow1=7.3&airflow2=12.7&airflow3=19.6&airflow4=27.2&airflow5=31.8&airflow6=35.6&airflow7=37.3&product_id=57)
![](http://www.squirrelpf.com/turbocalc/graph.php?version=4&pr0=1&pr1=1.07&pr2=1.41&pr3=1.75&pr4=1.75&pr5=1.75&pr6=1.75&pr7=1.75&airflow0=4.5&airflow1=7.3&airflow2=12.7&airflow3=19.6&airflow4=27.2&airflow5=31.8&airflow6=35.6&airflow7=37.3&product_id=60)
Now a 60 trim would be a better fit but those turbos go for more money. The $130 price for the others is a better fit to our budget. Now I just wanted to know if the 50 trim is a better fit then the larger 57 or am I seeing things.
Next question, do you think I can get away with running an internal wastegate? An external would cost us more money.
Now a 60 trim would be a better fit but those turbos go for more money. The $130 price for the others is a better fit to our budget. Now I just wanted to know if the 50 trim is a better fit then the larger 57 or am I seeing things.
Next question, do you think I can get away with running an internal wastegate? An external would cost us more money.
#3
Senior Member
iTrader: (1)
Join Date: Jun 2006
Location: Outside of the Loop-ATL
Posts: 761
Total Cats: 1
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
well either will work, your exhaust housing will make a big difference, the graphs seem weird for a 50 better(over all) then the 57.
Either will most likely start to run out of power above 5k with a 4L. I know 50tirms on a 2L will start to just lose breath above 8K. I would try and find the best budget 50/57 unless you can find a good used 60 trim
Either will most likely start to run out of power above 5k with a 4L. I know 50tirms on a 2L will start to just lose breath above 8K. I would try and find the best budget 50/57 unless you can find a good used 60 trim
Thread
Thread Starter
Forum
Replies
Last Post
elesjuan
Build Threads
7
11-03-2015 01:51 PM