DENSO 280cc 4-nozzle injectos

[mx3jmcb]

For 94-97 owners,

I just swapped out the OL' single nozzle stock injectors for new denso 280cc injectors with four nozzle design.

The difference is pretty big, the response has improved considerably especially at low rpm where pick up is notably quicker. I also noticed a gain in top end. The car also runs a bit richer at the same settings as my old injectors which is good because i was running lean over 6000rpm. I did a bit of pre-tuning this morning but cannot say as of now if my leaning out problem is fixed.

Another thing i noticed is the fact that the car runs much better now at lower A/F ratios which i guess is explained with the more efficient spraying of the fuel in the cylinder.

At 60$/injector, they are a must for any 94-97 miata!

Idle is perfect btw.

[mx5jmcb]

Seems like the DENSO 280cc injectors did not solve my problem completely....im still running about 13:1 AF at 7000rpm....it is a lot better than the 14.5+ i used to get but not perfect.

[BlownMX5]

Can you post a link to where you bought them?

[Tom @ Fast Forward]

Are you sure E-Cool is working? If you pull the plug on the 5th injector, does it get worse?


Seems like the DENSO 280cc injectors did not solve my problem completely....im still running about 13:1 AF at 7000rpm....it is a lot better than the 14.5+ i used to get but not perfect.

[magnamx-5]

Dude you added 20 cc/min apeice why not just throw in some 330's they will run just as well. I second what Tom is screaming it doese not seem like Ecool is doing as it should i would check the ecool system thuroughly and go on from there. There is no way at less than 230whp you are running out of fuel or Dutycyle on your setup. You could have a loose wire, cloged injector or even a fualty driver. GL man

[socal pat]

Can you post a link to where you bought them?

I got mine from Arizona TPI. What a great bunch of guys. They called me twice after my order. Once to confirm the order, and once to notify me that they had left the building on the UPS truck. Very personal service.

[Tom @ Fast Forward]

AZ TPI

Jeff and Joe

480-921-2500

$60 each. They include all new rubber worth $15 per injector.

[mx3jmcb]

Dude you added 20 cc/min apeice why not just throw in some 330's they will run just as well. I second what Tom is screaming it doese not seem like Ecool is doing as it should i would check the ecool system thuroughly and go on from there. There is no way at less than 230whp you are running out of fuel or Dutycyle on your setup. You could have a loose wire, cloged injector or even a fualty driver. GL man

E-cool works good...i honestly still dont know what the deal is.

Went to the track 2 weeks ago and shifter lower at around 6-6500rpm, the car was running fine. Started with 94 octane fuel which we have here in Canada and added 2 gallons of 116 octane Sonoco race fuel (leaded) to half a tank of 94 octane. Car ran super cool all day and had no problems.

The blower really provides a great powerband for on track duty...it gets quickly out of corners and has good top end as well. The blower with my new 225 width RA1 tires was a great combination. I wasnt passed once all day; i was the one doing all the passing. It was a piece of cake getting by type-R's, civics, rx8 and a single turbo 93+ 450whp rx7. ;)

Quite a few people asking what the deal was with the miata.

[magnamx-5]

Well i am glad you have it all sorted sounds like a good time

[mx5jmcb]

I've got no good pictures but this one sums it up pretty good!

http://lh3.google.com/kytty.kat/RsobsSvThdI/AAAAAAAAAMw/ZYplsWCXADE/lap_steCroix%20165.jpg?imgmax=576

Going back tommorow... can't wait!

[magnamx-5]

Was that a 1/4 mile track i dont get it?

[mx5jmcb]

no no....thats a race track and me passing another car.

:yes: