Cascade Crew

91RSVert · Posted: Mon Jul 20, 2009 6:37 am Post subject: More Injector Q's

So I am quite sure the "new" injectors I have are plugged as well the ones I pulled out (thats why I got diff ones)

So searching for more. Car has 21.6/22lbs in it now. I am wondering what other side effects I would have if I went to some 30lb and adjusted the pcm for it?

faster injector pulse? any downside?
anything else?

blue89 · Posted: Mon Jul 20, 2009 7:41 am Post subject:

The only thing I have heard is you start to loose the ability to meter fuel at small pulse widths. Since the injector has to flow such a large amount of fuel the holes don't do well at small flows, not as well as a smaller injector would.

91RSVert · Posted: Mon Jul 20, 2009 9:06 am Post subject:

You think 30lb would be to much? I do plan to go to the alumn vette heads, or maybe vortecs in near future.

Remember that I'm also OBD2.

Have a friend who wants to turbo it, but doubt the cash will be found to do it.

blue89 · Posted: Mon Jul 20, 2009 9:35 am Post subject:

I would run the BSFC numbers and see what you need. The LT1's come with 24lb/hr injectors and the corvette engine puts out 300hp (camaro 275).

Twilightoptics · Posted: Mon Jul 20, 2009 10:08 am Post subject:

30's aren't too big.

With MPFI losing idle pulse width isn't as big an issue as with TBI.

Run 24s if you're not planning to go over 300 RWHP.

91RSVert · Posted: Mon Jul 20, 2009 11:30 am Post subject:

300 is my goal with n/a. But in looking for 24s', seems I can get 30's cheaper then 24's because of less people bidding on them (evilbay).

Twilightoptics · Posted: Mon Jul 20, 2009 1:49 pm Post subject:

Heh and you think you've got injector problems now.

Something like that I wouldn't buy used.

Ford SVO from summit are a steal. 24s or 30s they even flow more than the standard rating because Fords lb/hr measurement is at a lower pressure. So they flow more like 25.5 or 31.5...

Alphius · Posted: Wed Jul 22, 2009 6:25 am Post subject:

Paul's right. The SVO 30lb I just bought were a really good deal. They're $240 from Summit right now.

Doesn't look like there are any 24lb ones on there though.

http://www.summitracing.com/parts/FMS-M-9593-BB302/

EDIT: At the risk of sounding dumb due to speaking from memory, Ford flows their injectors at 39.5psi. That's the number I recall. GM flows theirs at 43psi. Hence the Ford ones at 43psi in a GM system actually flow about 8% better.