hi all

which injectors would you recommend for a 396, 6500rpm maximum?

regards

 

Depends on cam, heads and such. I run FMS#30 on mine because the stock #28 were maxed out. See what your tunner recomends for your mods.

 

i live in Austria..i have NO tuner ;-)

i will tune the car my self, with -hopefully-the help of our forum members..they are a pool of knowlegde!!

 

What type of cam/heads?

 

hi Alvin!!

cam is a 3192/3914lobe custom comp cam with 113Lsa and 110Icl

specs

275 / 224 0.605int
281 / 230 0.622 ex

heads are 210cc AFR comp port 23°

regards

 

well.. on my 350 with dart heads and large cam i have svo #30 and at 6300 im at 80% dc. id say 30's will not be enough. id go #36 or if you have aftermaket engine management go with #42's.

 

Depends on who you want to believe and what you want to base your information on.

I have been involved with 434 CI motors running the best intake/head combo available for a 23* head motor that successfully run weekend after weekend 24# injectors (same injectors going now for 4+ years) in the low 11s to very bottom 10s. This is on a 85 MAF ECM.

I personally have run run 10.3s in 85 degree weather this year turning 7k rpm with 30# injectors and feel they are overkill. I can run as low as 10.5 A/F ratios if I want. My setup should dip into the 10.0s or maybe if I am lucky 9.9s if the weather gets real good.

I have tuned 415CI motors with 30# injectors that runs 9.9s as of lately with a stock 90 ECM.

We have run 24# injectors on 2 very successful and well respected 406 CI motors also sporting very good head/intakes that ran 10.9s and 11.0s.

There are several other 406 combos out there modeled after ours running low 11s, and winning countless rounds of eliminations (ralph)

There is 85vet's 383, and also corvette0096s, Beachbums 383s all running VERY low 11s weekend after weekend with 24# injectors.

There are tons of other examples of cars running less or equal to 30# injectors that put out VERY good numbers and run reliably year after year with these injectors.

So I guess the questions is what do you want to believe?

Real world examples as above that have PROVEN results or guestimates of what supposedly should work.

One thing is for sure with asking a question like this, especially on a forum board, you will NOT get a definative answer - so you have to choose which answers are best supported with the results you want. Above are some examples of some of the best running cars that pop to the top of my head off this board.

I realize that your trying to make the best decision for your application and with that said that is why I am trying to give you information with results that you can effectively compare to. The above setups are all VERY strong running and I am sure there are many others out there, but these motors above all fall into and exceed what your looking to built, so I don't see any reason your motor would not fall into the same area.

If you would like to discuss this more offline I would be happy to tell you more about some of the other findings we have found that go along with this topic.

Good luck in your research....

 

I forgot to ask what type of intake manifold your going to be running also as that affects peak HP.. Higher RPM gives injectors a harder time.

I would say at least at 30 and probally a 36. I've seen 30's go static at 430rwhp and 36's get you up to above 480 pretty easy on a NA car.

 

On my 396 I used SVO #30 injectors, and at 6150 rpm I was running about 12.6-12.9 AFR at 92% DC. I went to #36 injectors, but haven’t checked the DC yet, hopefully it’s down to about 80-85% DC.

 

What was your HP? I'll bet it was around 430 with a semi tight stall.. alot lower with a loose stall.

30's get you pretty damn far for most NA applications. 42's get you to about 500rwhp in a blown car.

 

assuming a stock pump? One thing you guys need to check is the voltage at the pump. The stock harnesses are notorious for building up resistivity over time, which cuts down on the power the pump can see. Fuel pump's outputs are VERY dependant on voltage. Some pump companies claim up to 20-30 % loss for every volt.

again I question how a bunch of us can do it weekend after weekend with TONS more motor running very good times with the same stuff with WB02s and some of the best datalogging equipment.

 

I would check with someone such as racetronics. I believe they are a supporting vender. I see them in the parts for sale section alot.
I make this recommendation since you said you are not using a tuner. If you were using a tuner I would get what he recommends. In my case I have stock injectors and im running out of fuel in the higher rpms. My tuner, Alvin, at www.pcmforless.com recommends that I go to 30's which I will do. With your engine I would not be surprised to see a need for 36 or so based on what I have seen posted here by reputable tuners.

 

i am runing the 36's on my 383 and have ran 42's with no problems. THe 36's are at 78% DC max and would probably be ideal for your situation as well. I always say ask your tuner whatthey want to see but if you are doing your own tunning then you will have to make that decision your self. Have you thought about a mail order tune and just doingthe data logs your self? By the time you get all the stuff it is about the same price and you get someone with a lot of experience to tune the car with out the painfull learning curve.

 

30s minimun.

 

I also think 30's will do just fine.. The will not leave any room for growth but they will be Ok. 36's will probally be preferable

 

maybe a mail order tune would be a way to go....if this is possible to send my datamatser logs to someone with experience (Alvin) why not?

do you make mail order tunes, Alvin?

regards

 

Yep,

I won't do this car though. Its too extreme for mail order tuning. I will be happy to do it if he can get feedback like TTS Datmaster datalogs or dyno sheets.

When you get wild like this its harder to directly match up your car with someone elses for a mail order tune. I don't want to waste his money or my time.

If he gets a chip burner and a datalogging cable and one of our 'over the net' tuning packages we can really fine tune her in.

 

Hi Alvin!!

thats not the problem...i have TTS Datamaster, a Eprom burner, cables, WBO2, Tunercat...

i think, when the time have come, we should get in contact, if you want!

regards

 

Sure,

check us out www.pcmforless.com