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Old 02-06-2008, 10:06 PM   #1
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Default 326cc Injectors

For local EPA reasons I am stuck with the factory computer for injector control off boost. Anyone have experience fitting 326 to 330 injectors relying on the factory ECU for off boost running? Would like to know if the ECU can correct for the increased flow and give reasonable idle and cruise.

Also wondering if the RC Engineering saturated 330s are PNP. New Denso 195500-2150s are Aus$300 each, so the new RC injectors look cheap from here. I would like to reduce the amount of fuel from the 5th injector for distribution reasons.
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Old 02-06-2008, 10:09 PM   #2
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RC injectors are not PNP. They have the wrong connector. Stock connector is round, RC is square. You can get an adapter to make the RCs go right in but they're expensive.
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Old 02-06-2008, 10:13 PM   #3
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Quote:
Originally Posted by DMD View Post
For local EPA reasons I am stuck with the factory computer for injector control off boost.
you should move
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Old 02-06-2008, 10:19 PM   #4
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The MSM will idle up to 330's. Not sure how that relates on other miata's but I would imagine it should be similar
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Old 02-06-2008, 11:11 PM   #5
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Default Injectors

There are some post on here about the 305 -330cc injectors. The 90-93 will idle up to 330cc injectors. They said you that you have to adjust the afm though. They said the 305cc idle rich and the 330cc have to have the afm adjusted.
I don't know about the newer cars.
I'm plaining to do the same for temporary budget and impatient reasons. Will they let you get away with a piggyback???????
Joe Perez has one for sale.
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Old 02-06-2008, 11:58 PM   #6
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I have a piggy back controlling ignition and the auxiliary injector when in boost. No control of the factory injectors, but I would like some more head room for more boost.

The fuel pressure is controlled when in boost up to 100psi at whatever rise gradient I choose with the Aeromotive auxiliary pump and controller. A bit crude but my AFR and exhaust temps are borderline fine around 10psi. Looking to increase to 14psi, which should put me in the best part of the turbo map. I'm hoping that 330s will cope. May need a reducing boost curve at higher RPM.
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Old 02-07-2008, 12:34 AM   #7
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Default injectors

I have RC 550cc injectors for when I get MS. But for now I'm going to print off brain's sticky and go to the junk yard for some plug and play 326cc or 330cc injectors cheap. They have alot of Mazda's and Toyota's.

I wounder how much the AFM can be tuned for idle and cruise?
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Old 02-07-2008, 01:03 AM   #8
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I will make some enquiries here abouts, preferably 326cc and let you know. Maybe of interest.
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Old 02-07-2008, 02:27 AM   #9
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Hi DMD,

The Denso 330cc high impedance injectors out of a 323-GTX are plug and play. I have a set in my 1991 MX-5. They pop up on ebay every so often for reasonable prices.

I have a stand-a-lone Link ECU so I can't comment on the question around the factory ECU controlling 330cc injectors at idle.

I have a set of Denso 550cc high impedance injectors that are for sale, but I guess they wouldn't idle to well on the factory ECU.

J.
Did you know that the Victorian MX-5 club is hosting Natmeet 2008 in Beechworth. There should be upwards of 50 MX-5s there over easter.
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Old 02-07-2008, 04:09 PM   #10
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There are some 330cc injectors for sale right now on ebay.

http://cgi.ebay.com/ebaymotors/ws/eB...195593812&rd=1

Not mine of course.
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Old 02-07-2008, 05:19 PM   #11
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Quote:
Originally Posted by trito View Post
There are some 330cc injectors for sale right now on ebay.

http://cgi.ebay.com/ebaymotors/ws/eB...195593812&rd=1

Not mine of course.
Those should be:

90-92 MX6/626/Probe Turbo 326cc - Gray Top #195500-2150
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Old 02-07-2008, 05:22 PM   #12
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DMD, are you a DMD?
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Old 02-11-2008, 05:56 PM   #13
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Sorry for the delay in replying. Been away. DMD are my initials. I'm a CPA. Don't you just love acronyms!

Will check out the MX5 gathering at easter. Thanks Juffa.

I can't seem to locate 326cc injectors locally, so it will be the 330cc RC Engineering saturateds plus the Flyin Miatta wiring adapters. Glad the exchange rate is around US90c. I am still a little concerned about off boost running. Just have to see how it goes.
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