New to Miata's need help on turbo setup
 

Hey Guys I just picked up a 1990 Miata with 82,000 miles last week and I'm wanting to give it a little more pep.

My goals are a 5-6 psi turbo setup to make the car a little more fun. I have a 03.5 Mazdaspeed protege as my daily so I am not new to Turbo's.

I have a wideband in My protege that I can put in the miata for tuning purposes. For now I do not want to get into using piggyback's of any sort, most likely in the future.

I have a Freshly rebuilt Td05 14b turbo that I plan to use with my miata.

My question is what would I need to do a 5-6 psi setup as a bare minimum start for fuel management and timing control? Cost needs to be a bare minimum, I plan on purchasing as many used items as I can. If possible I would like to utilize the stock fuel pump for now. I can most likely find bigger injectors out of a local pull it yard, what are common ones to use? Thanks for any help guys.

Bare minimum? A rising-rate fuel pressure regulator and just dial back the cam angle sensor (CAS) to retard the base timing by 4°.


The stock fuel pump, assuming it's in good shape, should be adequate for 200 HP assuming you get there with a combination of aftermarket ECU and larger injectors. With a RRFPR, maybe 160-170 HP.

Change the fuel filter at the very least. Cheap insurance, and I'll bet you a dollar that the one in the car presently has 20 years and 82,000 miles on it.


https://www.miataturbo.net/diy-turbo-discussion-14/diy-faq-all-your-answers-one-big-post-4288/

Ok, I have reviewed the Guide you posted and have a few questions. What would be a good size injector to bump up to that the stock ecu will run the car well on? Also, with bigger injectors would I turn the stock fuel pressure down below the stock 43.5 psi to help keep the mixture good during idle/cruise conditions? I have a aftermarket fuel pressure regulator that I can fit on the car to do so.

Use this to see what injector size you want

http://www.rceng.com/technical.aspx?...Kjmiswprq3f4Kc

Then you can also use that to see what fuel pressure you want to run, the higher the pressure, essentially you make your injectors "bigger"