I've done some searching and can't find a whole lot of tuning info out about these. Does anyone on here have experience with them? How are they to tune at idle?
I spoke to the guy at Acceleronics, and he told me to just change the IFR table and I should be pretty close. He said he hasn't seen any need to change the off-sets with these. Sound about right?
Just for reference, I was able to get my Siemens 60's dialed in with just an IRF change, worked VE table, and some idle airflow changes. Idled around 14:1 AFR. Just wondering if these will be that easy. Cam will likely be 23x/24x on a 114-116. Motor will either be 370 or a 427 with Procharger.
Thanks in advance.
__________________ 06 Silverado rcsb
First Procharged 99+ Truck in the 10's, 9's and now 8's!
Special thanks to:
Madman @ Insane Chassis Works
Jeff @ Custom Automotive Machine
I'm running the exact same setup on my car, but I am on E85.
The idle might be tough to lean out on gas with a 370, but a 427 should be easy.
I am running mine at 70psi base and the idle PW is right at 2.0ms @ 1.0 Lambda.
My tune is on low boost right now as I learn, but I am very with these bad boys being at 60% duty cycle at 700rwhp~ (6,200rpm .77 Lambda on E85)!
Running that setup on my Camaro with a 347 and E85 and it idles at 14.7 cleanly with a base fuel pressure of 54 psi. You should be able to get them to idle clean on gas by dropping the pressure a bit but decel will probably run rich regardless. You'll be missing some transient fuel tables on an 06 silverado operating system that would be beneficial but it's not too big of a deal.
For those using EFILive and having problems - go to the EFILive forum and search for .cax files. Find the one for adding table B9021 - Min Pulsewidth... This did wonders for the one I was working on! was able to bring them right in to idle at 14.5:1
1999 GMC Sierra 1500 ECSB 2WD - mods to come...
2002 Trans Am WS6 - 9.41@143, 3675#, pump gas and drag radials - sold
I contacted Jeff last night (designer of Acceleronics box) and asked about the offsets. Here's what he replied(keeping in mind, I have the 95# and an LT1) I ran stock offset vs voltage values when I had the 95s in my LT1. I always recommend starting with the stock offset values for any ECU because low impedance injectors open about as quickly as stock injectors.
Generally speaking, offsets have a noticeable effect on idle and almost no effect on WOT, so that should guide your adjustments. The injector size constant will have less influence on idle than offset assuming you make small changes, e.g. changing the offset from 1.0 ms to 0.8 ms will make a noticeable AFR difference at idle and almost no difference at WOT.
Assuming you have the LT1 PCM, I'd start with 95 for the injector constant and stock offset vs voltage values. That should put you very close. I would not recommend using the Mototron values (assuming PCM4less changed the offsets) because those injectors are very lazy. You would probably be pig rich at idle with Mototron offsets.