injector duty cycle??

[skinnypimp-ss]

i have a 2000 camaro with a midsized cam and bolt-ons. with the stock injectors (26.6lbs) and a walbro 255 pump my car was at 98% duty cycle. that fuel pump died in under a year and i ran the car not knowing it with very low fuel pressure, the injector duty cycle was at 120% so i installed a racetronixs 255 and a hot wire kit at 65psi. the injector duty cycle was still at 110%. i replaced my injectors with some out of a low milage 02 ws6(28.8lbs) and my injector duty cycle is still around 105%. through all of this i never messed with the tune except to change the injector flow rate to match a stock 02 ls1 car. why is my duty cycle so high?? i have seen several heads and cam cars run 28lbs injectors and they should be plenty for my car.
when data logging a run of my car my VE tables show 0 from 4000rpm and up so the air fuel should be close shouldn't it? and is this effecting the way my car pulls on the top end?
please help have a race coming soon!!

my cam is a 228/232 588/595 and i have basic bolt-ons and at the time of the tune my air/fuel was around 13.0 and 12.9

[WS6FirebirdTA00]

Your IDC is high because your injectors are too small. No, the stock injector is not enough. Don't care who runs them. I had a cam only car I tuned that maxed them out (230/232 cam), put some GTP injectors in there and it was good to go.

[NassyVette]

Any IDC over 80% and it's time for larger injectors. Put a larger injector in and you should be fine.

[skinnypimp-ss]

what size should i go with?

[KLUG'S SS]

Their are some good choices out there such as the Ford "Green Tops" which flow over 50#s at GM's fuel pressure or some GTP injectors as WS6 mentioned and their some other good ones just make sure that you go with an injector that you can get ALL of the right data for like offsets, etc... so they can be tuned correctly and not have your tune all hacked up.

[NassyVette]

Their are some good choices out there such as the Ford "Green Tops" which flow over 50#s at GM's fuel pressure or some GTP injectors as WS6 mentioned and their some other good ones just make sure that you go with an injector that you can get ALL of the right data for like offsets, etc... so they can be tuned correctly and not have your tune all hacked up.

What he said, I'm running lucas 42.5lbers now. Before I found the correct offset data I was chasing my tail trying to tune my VE with all sorts of weird lean spikes etc.

[69lt1bird]

http://fuelinjectorconnection.com/sh...&productId=179
Easy to tune and cheap.

[skinnypimp-ss]

so im thinking of going with the gtp injectors, cause the cost, what do you all think?

[WS6FirebirdTA00]

Yes, those are good injectors. That is what I run.

[MMGT1]

Milzy has them refurbished if your looking for those. Got mine 3 years ago and they have been good so far.

Milzymotorsports.com

There is a listing on e-bay right now for 35 a piece refurbed'

[miker2]

anybody find good cheap plug and play wiring adapters for the greentops ?

[WS6FirebirdTA00]

??

Green tops plug right up

[WS6FirebirdTA00]

So many people overlook the GTP injector. ~40# on our stock fuel pressure, good for just over 500 hp and all the correct tables are out there, just like swapping over to a 2002 injector from a 2000

[murphinator]

So many people overlook the GTP injector. ~40# on our stock fuel pressure, good for just over 500 hp and all the correct tables are out there, just like swapping over to a 2002 injector from a 2000

just to give you more options the injectors in a gtp are also in all the other 97-03 L67 powered cars ( 3800 series 2 supercharged) : bonneville ssei , park avenue ultra , riviera , regal gs , olds lss , impala ss

I part out quite a few l67 cars , they are the same , the non sc cars (l36)are smaller

[WS6FirebirdTA00]

Yea, I forget the p/n so I just call them GTP injectors lol

[Cantalope Kid]

Wow! Talk about a learning session early in the morning. Never even considered GTP injectors. Great idea! Cool to see all these leads and great finds in one spot. Thanks guys!

[MMGT1]

Anyone have a connection for the Ford Green Tops mentioned here? I am hitting 68% IDC in my 3400 with GTP injectors. I am now installing a Vortech V-9 charger and I am assuming I am going to need more fuel. Once the charger is on Ill know for sure, but would be nice to know where to look for those Green Tops. They are really a 50lb injector guys? My rail puts out 53-55psi at start up and right around 50-52psi running.

[WS6FirebirdTA00]

If you are running 50 PSI, no they are not 50#. The green tops do not need a special connector, I had them on my car at one point.

[miker2]

??

Green tops plug right up

my 5.3(2000 suburban) and my 6.0(lq4) and my radix all have delphi mini connectors. my greentops are ev6 connectors. i was asking about an adaptor that didn't require cutting my harness.

[RWTD]

So many people overlook the GTP injector. ~40# on our stock fuel pressure, good for just over 500 hp and all the correct tables are out there, just like swapping over to a 2002 injector from a 2000

If you don't mind, can you tell me what vehicle/year to open up to get the proper values for them? Every V6 file I've opened has only the IFR table and NOTHING else, since HPT hasn't yet included all the other tables so we can get all the proper data for them.

And, from the factory, are the vehicles who use those injectors on a 4-bar system? If not, then those values from their calibration file aren't proper.

Edit: I just opened '02 Regal GS and an '04 Monte Carlo SS files from the repository, and the only fuel injector control parameters available are "Flow Rate vs. KPA" and "Skew vs. Cylinder", just like all the other vehicles I've seen with this particular injector. This is hardly enough data to properly use them on any other vehicle. Until HPT includes the rest of the injector parameters, I'd HIGHLY suggest NOT using this injector, otherwise you're just raping your tune.