Dyno'd the car at last
 

After all the fiasco with my rear end and getting everything right, the SC installation is done and the dyno was done today. The car dyno'd 535rwhp 480rwtq at only 7.5lbs at 6000RPM only!!! (Cam peak at 6400RPM) The graph was still going up, but they had to shut down because it was leaning out really fast (From high 11's to high 12's AF). The fuel pressure is around 55psi, but the injector duty cycle is around 130% :eek2: . So i need larger injectors, but what piss me off is that i only have these injectors in the car for 30 min :cry: . Im really happy with the results so far, but i need Injectors ASAP.
Where can i pick up 60lbs injectors for cheap?

NOTE: Almost new SVO 42lbs injectos are for sale for anyone interested.
Whoever want to sell 57 or 60 lbs injectors please tell me ASAP.

Sorry I can't answer your question but can you list your mods? Nice numbers

Thanks.
Engine and drivetrain Mods are: FLP headers ORP, Hooker Catback, 26918 Springs (Dual Springs on order), FM7 Cam 224/230 .587 .593 114LSA, Mcleod Clutch, 8.8 Rear end with 3.73 Gears, Chromoly Drive Shaft, ATI 8 Rib Setup 4.25 SC pulley, SVO 42lbs injectors, 255 Intank Fuel pump. Tunning done via LS1Edit.

Nice! time for some 57's.

I found a place that sell 57lbs for $480 high impedance. Do u guys think thats a good price? Also should i get the high or low impedance and whats the difference between them?

You want HI-Z injectors. If you get Low, you will need a converter. I know there is a sponsor on the boards that sells the 60# Mototrons. They are great injectors.

While you may be out of injector, i would first get the fuel system at least steady pressure to hold the stock 58 psi, or idealy with 7# of boost you want 65 psi of railpressure, (58+7) you need to add a boost referenced regulator to keep the pressure drop across the injectors constant. Currently as you build boost, your injectors get smaller (not good)

Ryan

But i thought if we are tunning via LS1 Edit i dont need a regulator right? How can i change the fuel pressure with LS1Edit?

build a whole fuel system man... 60# injectors are more than twice as big as the stock ones. Think about that, your going to need other stuff to support it.

Even though you tune via edit that doesnt mean anything when it comes to fuel pressure.... if FP is dropping then the injector size is smaller then its rated size. Most Injectors are rated at 3 bar FP... 43.5PSI The LS1 fuel system runs at 4 bar..... 58 psi.... so a 42# injector is bigger then the stated 42# injector. Like my Motron 60's are like 68#ers at 58 psi. That is the problem with the LS1 the Regulator is at the tank.... not at the Rail like it should be. A FP regulator is was .... regulates FP...... Thats why everyone says to buy a adjustable FP Reg. If your inj. are at 130% then they are way beyound what they were designed for...... with a higher FP they could go farther.... but the standard to not go over is 80% injector duty cycle..... The 57's are nice but if you ever plan on going way big down the road go with the 60's... or even the 75#ers... thats the biggest High impedence Inj.... but has a cost... $750. We can only run high impedence injectors and if you do go with a set of low imped. injetors you have to run a converterbox and its another $400 or so.... and i dont even know how its works with tuning........ hope i didnt confuse you.
Kyle

I tune with HP Tuner buddy! ;) Used to use Edit, but now only the pimp stuff lol.

It was a pretty steady 10.5:1 then bout 5200 it starts to do the tail up leaner. Its maxing the maf out pretty early so I figured have to tail up the PE like normal but it would make it richer then do the tell tale trail up. Need to open the cutout and let her pull ;)

I think you should be looking for the injectors that act the best - are easily controlled. Big injectors dont like to idle at tiny pusewidths look into the racetronix 57, and mototron 60s, and never buy injectors again

Oh yeah.... your supposed to run a converter with the low Z.. but Ive actually run them on stock pcm, no box. Wouldnt recommend it, I find out AFTER I tuned the cr but it worked ok lol

Can my LS1edit read the modifications to the PCM now since u tuned it with HPT? Im getting 60lbs mortons since i found them for really cheap. I will call tommorrow to see if the price is for real.

your numbers are great, that must be a good blower cam, how's it on start up and idle?

the GM f-car fuel sysytem is not controld by the computer, so you will need a mechanical regulator, returnline, ect

or a good pump, some careful tuning, and larger injectors should get you where you need to go as well.

Ryan

Do yourself a favor and get the 60's, get a fuel setup (like pump(s), rails, and boost referenced regulator), and be done.

For the 60's I would set the fuel pressure via the regulator to a FP somewhere that will be comfortable for your system. If you are only boosting 7psi then set the base FP to something like high 40'spsi.

Ex: With vacuum you are running 48psi. So at boost you may be in the low 60's. You will just have to play around with it.

If you dont change the base FP with the boost referenced regulator and you run real high boost, you will be running 70+psi of FP..which you want to avoid doing. You really want to avoid going over 75-80psi

Thanks... I was expecting 540rwhp at 6400RPM or so, but i was surprised when Jeff told me on the phone that it made 535rwhp at 6000rpm while boosting around 7.5 psi!!! Im aiming for 9.5psi at 6500rpm when i get the 60lbs injectors and dual springs (which im waiting for two weeks now). The car drives really well... U can compare it to a TR224 which is really streetable in a M6. Alot of people thought that this cam is too much overlap before i got this thing on the dyno. FMS rocks :thumb:

New Era Performance rocks! They are a sponser here. I bought the 60lbs injectors from them for a unbelievable price. Check them out guys. Heck its cheaper than the 57lbs racetronix injectors. I wish i saw them before i bought these 42lbs injectors.

Yes, but the Mototron injectors (Siemens DEKA IV) are not flow-matched unless you buy them from PTE.
We could knock off $10.00 from every injector if we did not go to the trouble of flowing and grouping the injectors which BTW requires us to have a few hundred or more in stock.

Whats the difference between an injector that is flow matched and one that isnt?