What size injectors would you recommend for a 100 – 200 dry shot? I have an LS6 intake on the way and am sending a TB to be ported, so I’ll be putting it all together in the next few weeks and thought I’d change the injectors while I am in there; what do you suggest. Oh yea it is a daily driver so keep me reliable!

 

For the cheap end stock viper injectors, Bosch 30lbs and can be found cheap on viper boards. Or pick up a set of 42lb, Lightnings use them so should be able to hop on their board and pick some up cheap also. Then tune and be good.

 

Big difference between 100 shot and 200 shot. You'll really want to look at your AFR with a wideband, but 100 shot with your stock injectors (no cam? right?) "should" be ok. Seems that everyone's car is a little different and you really didn't list much about yours.

 

My car is a 99 C5, no cam, stock heads (6 speed). I really hadn't planned to hit more than 150, but everyone says once you hit the switch...

 

If I use 42 pound injectors (more is better right) will it impact anything else?

 

99 C5 has 28 lb injectors and return type fuel delivery. I had 26 lbs (stock in 2000) and ran the 150 shot on them. I was near maxing them out though with a duty cycle of 98%. I went to the SVO 30s and they don't even get close to 80% now. I think the highest I logged was 76% DC.
---Don't take all this as GOLD. Once you go over 100 shot, really start monitoring. Beer99c5 was maxing out at a 75 shot. Odd, but none the less, true. Do it right, or don't do it at all.

"more" is not always better either. There are threads talking about tuning down 42s (or 60s). The SVO 30s flow at 35 (ish) lbs with our fuel pressures anyway.

 

I REALLY don't think you should even consider a 200 shot on a dry system. I think that could lead to very bad things. I would really not go above 150 on a dry shot. I personally have a 100 shot and it does fine without pushing any safety concerns. It gives a nice kick and I am not concerned with my engine haveing a catastrophic failure. Just my $.02

 

Thanks for the info Todd that is just what I was looking for. I read Beer99c5's post, that's why I am thinking the time is right.

Where can I find the SVO 30's, any supporting vendors?

 

Keep on top of the 'for sale' sections on CF if you want a bargain. They really aren't that expensive ($250 ish) new, but there's always those "beer99c5" guys that go BIGGER BIGGER BIGGER. LOL. Make sure you're getting a flow matched set... with the papers. I took a chance and got a flow matched set, but the guy didn't have the paperwork. They work fine. whew. But I am spending a little more time dialing them in.

 

Wow, I better stop spraying my 250rwhp dry shot on my bone stock longblock, which currenty is the quickest in all the land. Check out the wet vs dry thread for insight, which also contains the math for injectors sizing.

Seriously, a 200 can be considered, but it's important to have tune and fuel system spot on. Also, know your drivetrain limits where a dual stg may be of benifit.

I would go with the SVO 42s, as this gives you growing room. I run these and at 550rwhp I am close to the rec 80% duty cycle. They have absolutely no effect on driving/idling or any parameter and work better than great in all conditions. I bought mine for $80 used from a Lighting.
Robert

 

OK now for the next logical question. Since the injectors aren’t GM are there any issues to installing them, are they the same impedance etc? Any tuning required?

Thanks

 

ya, you do need to tune the car for them. Otherwise it will run really rich. It's not a big deal, just sounds scary. You'll need a program like HPtuners or LS1edit. Installing them is even less difficult. Takes about 30 mins.

 

There are a couple spread sheets floating (redhardsupra in tune section) around that will automatically rescale for ya. You just put the info in it asks for and bingo, numbers are given, then just put them into your existing tune. A very easy deal, and any tuner can do, and most self tuners. The Ford SVOs are a straight drop in mechanically, as most are.
Robert

 

97-98 C5 returntype fuel system, 99+ returnless fuel system, know your facts before you try to act smart......

 

26's are stock in the 99 and 00. 28's in the other years.

I went with HSW Delphi 42's, under $300 for new ones. Had no problem changing the tables and running them in the car (just did what CAT3 told me to do and used the redhardsupra/TAQuickness speadsheet for IFR).

 

Bville... 42's can be run in a stock car with absolutely no issue is they are tuned. Tuning considerations: Adjust flow table (RedHardSupra spreadsheet so its too easy), adjust min. inj flow time, adjust default inj. flow time. Do some logs and check that the spreadsheet spit it out on the money (I've not had to adjust using the spreadsheet once). My old car still has 42's in it, stock Z06 cam, stock 271 casting heads, manifolds and cats. Its a calm, reliable daily driver...yet hit the silly switch with the system jetted (which in my case means no jets, or about 225rwhp shot) and you hang the hell on!

 

oops. I stand corrected. (corrected is one thing, rude.. well you're just being an ***) My point is the same, don't just bolt on and go.