Winnertrucks00

I am looking to put a cc503 cam in my stock motor with my heads that are getting freshened up right now. I found Bosch injectors with numbers 0280150785 on eBay. From what I found these are a 30lb injector. Does anyone know about these? Do they fit my 95? I'm new to the injection game so I'm kind of lost. Also in high school so budget is low.

93M6Formula

You don't need new injectors for a cam only LT1. The stock 24s are just fine. Since you have a low budget, save the money for the other parts you need for the swap. And don't forget a tune. I recomend Solomon at lt1pcmtuning.com.

Edit: That said, Bosch 30lbers are a good injector but aren't really needed until you do a bigger cam and head work. Beware of Bosch chinese knockoffs on Ebay also.

Winnertrucks00

I thought that I had read that stock injectors would work but they would be over worked and fail a lot sooner. Is this not true about the injectors? The car has a CAI and longtubes.

93M6Formula

Common misconception, TONS of people running 24s with a cam only setup with no problems, me included. A lot of people think they need more injector than they really do a lot of the time. I use only what is necessary. Longevity can be shortened but not by enough to really worry about.

ACE1252

I personally think the 24s are pushing the limit with the CC503. It ultimately depends on the power the car is making when all the mods are done.

If I'm not mistaken, at around 6000rpm, my pulse widths are over 15mS. When you shake out the math, 60/6000 = 10mS then x2 for two crankshaft revolutions.....so you get a 20mS max window for the fuel. To get the duty cycle.....15mS/20mS = 75%.

At 6500rpms, that shortens up to 18.4mS....then 15mS/18.4mS = 81%.

So I'm approaching the 85% duty cycle "rule" even with 30lbs injectors.

I think the thing to do is be careful. If you stay 24lbs injectors, pay close attention to the pulse widths, at max rpm, to make sure you are not bumping against their limit. You don't want to run them 100% duty cycle as that means they can't keep up with the fuel demands of the engine....and if it goes too lean....boom.

I personally would go with a good 30lbs injector(which is what I did when I installed the CC503).

Can it run on 24s? Yes. It is a good idea? Hmmmm, depends on the power level of the final setup.

Gojira94

iTrader: (4)

^ true.

24 lb injectors hit 90% duty cycle at about 345 flywheel horsepower, with a BSFC of .50 (about average BSFC for naturally aspirated cars). CC503 on unported heads with 1.6 RRs and springs appropriate to the cam with CAI and headers might make 320-325 HP at the flywheel. That would put your stock 24# injectors at about 85% duty cycle.

ACE1252

I think you are too low on that hp number. '96-'97 SS models were 305hp at the flywheel with just an intake and better flowing muffler alone.

I'm fairly certain I'm pushing close to 385-400hp at the crank with a CC503, long tubes, catback exhaust, 1.6 rockers, PAC1518 springs, guideplates, hardened pushrods, 30lbs. FMS injectors, and CAI. My 30lbs units are pushing 85% DC with this setup.

Now, I am picking up a little bit of compression compared to stock heads as my heads have been cleaned a few thousands to straighten them out after a bad overheating event. The port sizes and valves are stock.

RamAir95TA

iTrader: (2)

Seven apples plus four oranges don't equal 11 peaches.

96capricemgr

iTrader: (1)

I get the math and such, and I know the computer reported DC is wrong.

I also know guys have done 500rwhp with 30lbs............

24lbs will feed a cam only setup, BUT I am not sure I trust 20yo injectors to do so and if buying 30lbs makes sense so you have room for heads later.

SS RRR

iTrader: (2)

Common core math?

Jaxem

iTrader: (3)

i'm in the middle of a cc503 swap right now, and i picked up a cheap set of SVO red tops as insurance. #30 should be plenty for now and if i go any further in the future.

ACE1252

Not sure where you are going with that....I must be missing something. Unless you are speaking of the differences between a 95 and 96-97 model. The playing field between them levels out once you change the y-pipe(at least according to John Moss...back in the late 90's). Motor Trend had an interview with him years ago where he stated that difference in the 95-96 hp rating was mainly due to the change in the y-pipe for the 96 model when dual cats were added.

However, I'm fairly certain that the OP will well exceed 325hp at the crank with a CC503 and the proper supporting mods.

ACE1252

Oh, I need to also mention that doing the cam with stock exhaust manifolds will not net you much at all. However, if the engine is already apart and in good shape, then a cam swap makes sense. Just be prepared not to feel too much hp gain.

I did that(CC503 cam, intake, 30lbs injector, catback exhaust, springs, guideplates, hardened pushrods, stock exhaust manifolds) and only saw a couple mph increase in my 1/8 mile trap speeds. My 1/8 mile times only dropped a tenth or two. I was really disappointed with all I had spent. I didn't think the stock exhaust manifolds were choking it that bad. Boy was I wrong.

When I added long tube headers to my car, the mph went from 83 to 89 and I dropped 0.4 tenths from 8.7 to 8.3. These are not fluke times where all the stars have to be aligned to run the number. The car hits 8.3@88-89 on a regular basis. I'm granny starting it off the line too...

96capricemgr

iTrader: (1)

I did a cam with sock gears, stall, manifolds and gained little, then saw BIG gains when I did those other mods.