9secz

I'm getting serious about promoting the Acceleronics VersaFueler[tm], a black box (literally) that lets you run big, low-impedance injectors with the factory PCM. I'll be gabbing with the board operators about advertising soon, but in the meantime I want to let y'all know I've joined up.

VersaFueler description, pictures, and cost info is here: http://www.acceleronics.com

Info on the car I built s/n 0001 for is here: http://para.noid.org/~lj. It ran 9.82 at 145 last spring on a lazy launch and through a full exhaust including functional cats, and is regularly street driven. Full interior, stereo, a/c still works.

And yes, I realize this is LS1Tech and my Camaro has a dinosaur LT1, but I also have a C5, OK?


LJ

ChrisB

I have one of LJ's box's with some 72 lb/hr injectors, and can say it works like a charm - and the car idles like a kitten (stock injector offsets) - definitely a great buy.

Pro Stock John

iTrader: (34)

Hi LJ, welcome to the board. This section is very LT1 friendly since 90% of the FI stuff is the same for either engine.

One thing I am wanting to see is how good folks with the LS1 get their cars to idle and transition to WOT with big injectors and a stock PCM. I've seen data here and there that has said it's hard to get 83's to work well with the stock pcm, the transition to WOT is very tricky. I am thinking maybe the only way to do it is via Open Loop tuning, anyone have thoughts on this?

ChrisB

I didn't have any WOT /transition issues on my lt1 or on a ls1 (that was with 75's, but should be esentially the same). I did see the idle pulsewidth floor issue (some sort of min pulsewidth), but just set the car in pe mode at idle so there were no l-trim issues. It runs a bit rich at idle (rich being ~12.5, so still perfectly fine) - but other than that no problems.

SS00Blue

Great site, LJ. Your car is very nice. Very well thought out and documented.

SC-

y2khawk

iTrader: (5)

Using my own box, my 96's hit the min. pulse width hard. If left on, the closed loop fueling will drive the trims to full negative, shorts and longs. Makes for a nasty tip in hole. No way around that.

83's on the TT LT1 we built, same box, no problems. The minimum PW is much lower on the OBD1 boxes.

Thomas

The last two controllers that I got from you made such a performance difference. BOTH of these customers are getting 383's as we speak!
More orders to come!!!!! Always in waves...

I wish these guys would come up here, I'm feelin slow in this thin air. Check out our latest #'s 701.8 RWHP http://www.dynopro.com/mhhr_detail.asp?ID=548

ChrisB

So turn it off Set the tps to enable WOT to 0% for 0-1200 or so and you will be in PE mode until you hit 1200rpm. No fuel trims, no corrections, so no problem (at idle)

y2khawk

iTrader: (5)

Did I say i had it turned on??

I don't even have O2 sensor wires in the engine harness anymore, they aren't worth much with all the lead

We'll see how i can do with 160's in there though, should be fun.

Whistler

iTrader: (46)

Matt, just wondering... with all the steps you've taken towards full-race, why retain a GM PCM? A FAST or GEN 7 would be easier to tune and not have any issues running big injectors. Plus datalogging, WB O2, 2and 3 bar MAP..... again, just wondering.

9secz

Any idea what the pw floor is? 1.5 ms? The next VersaFueler will have programmable boost-based enrichment, but I'm also considering a fixed offset that could positive or negative. If the floor is 1.5 and you need 1.0, just dial in a 0.5 negative offset.

smokinHawk

iTrader: (48)

lead will destroy a wideband just like it would an o2.

get you some denso lead resisnant o2 sensors.

ChrisB

I seem to remember it was around 2-2.3msec, but I will see if I can dig up the old log files.

I never actually measured the injectors on time - I guess it could be possible that it is a stock injector driver issue also?

White_Hawk

iTrader: (3)

That might explain why my car always had high negative L-Trims at idle. They would sit about -10 or so but as soon as I hit the gas, it would jump up to 0. I wonder if it was bottoming out on the ipw. I was running Ford 42's with a walbro in tank. I watched the PW on the scanamster and they would be 1.9 to 2.5 at idle.

-Geoff

red ws6 99

I think its has to be around 2.2 to 2.3 msec since thats what my msd 50 lb injectors are sitting at. Its the exact same on time I had with my 26.4 injectors. May have to go the PE route since my idle sucks.

Gary

y2khawk

iTrader: (5)

it's lower than that, my 42's would idle at 1.5 when warm.