I've got a B18C5 in my 94 Hatchback and just installed Skunk2 Stage 2 Cams, Cam gears, valvetrain AEM Fuel Rail and Regulator. Do I need 310 injectors to max out my setup or can I just up my fuel pressure? Also, I'm going to do all of my tuning via Hondata. Thanks.

 

back to the top

 

if you are getting hondata then go with 370-440

 

please send that dyno this way when you get it done

 

Mr. Bravo, throw your car on a dyno with a wide band 02 sensor. If your engine is leaning out (a/f ratio above 13:1) anywhere in the powerband (most like up top in the rpm range) and you can't correct this by adding more fuel with a VAFC or with a ECU interface like a Hondata (I personally am using a Hondata 2a and love it) then you know you've maxed out the duty cycle on your injectors and it's time for bigger ones. A dynamic interface like the Hondata unit will actually show you injector duty cycle within the software so you can be certain what's going on with your fuel flow.

In all likelihood you'll be fine with the stock injectors with your set-up. I'm assuming you're not running high compression, so I would say it's extremely unlikely you're maxing out your stock injectors with just higher lift cams. You should be fine, but of course tune that sucker on the dyno to be sure and so that you get the most out of your cams!

Dave

 

Unlikely? Unlikely that he can get anywhere near enough fuel

 

Stock compression in a B18C5 and TODA Spec Cs, you need more than a factory B series injector. Needed more than a 310, 370s finally fed it enough.
Food for thought...


Jason

 

Oh I forgot...I'm running 12:1 compression.

 

with 12:1 compression I think you probably will need to upgrade your injectors. I needed to with Spec B's and 12.3:1 compression, though I wasn't leaning out until over 8,000rpm on the stock injectors. Do you have a VAFC or some other way of modifying your fuel map?

 

with big cams and high CR IMO you need some good size injectors to get the best gains !

 

With stock injectors and my Toda B's I was hitting 100% duty cycle with just the cams and stock exhaust...with 310's and the HyTech exhaust I was hitting 98% duty cycle, with 440's I was at 75-77% duty cycle...this was without an adjustable FPR. Fuel pressure under full throttle with the 310's was 55psi, and with the 440's it read 50psi...these were datalogged while on the dyno.
Austin

 

bravo-

If you're running large cams and such a high compression, 310cc injectors might even be too small. I would recommend 370's and then use your Hondata system to dyno tune.

Feel free to post up that dyno graph when you're done. I think we're all interested to see what kind of power you're making.

 

You got it... Now who has some 440's for sale?? Anyone?

 

.....i think austin had some 440's for sale recently.

 

I just pulled them out of my car on Saturday...used since September and they have the clips...
Austin

 

I just hope the AEM FPR and the Prelude 290cc will be enough for my spec B set up!!

 

How much?

 

Not sure...make an offer...probably should have used the IM feature, oh well.

 

I'll give you $17..

 

Damn Florida crew....I guess all that beer is starting to get to you....

 

mmm

 

LOL.. $17, damn, Dominic out bidded me... I am looking for injectors aswell, but I was searching for at most 370cc. Any reccomendations brand/price


[Modified by azn98R, 4:08 PM 3/6/2002]