I recently purchased the Commander 950 from Summit. The part # I purchased is 950-21S. I havent begun installation yet, because I want to make sure I have all my questions answered and that I have everything I need and want for it prior to install. I have searched the manual, the Holley site and this board for answers and have gained allot of knowledge, but still have some remaining questions. On my application it is my intention to control ignition with the Commander 950 . I plan on having Ignitionman help me with this. On to the questions. In the wiring harness there is a 3 pin plug (+IPU, -IPU and Points out) close to where the ECU plugs in. It is referred to as IPU on the schematic of the harness, but I am unable to determine what to plug in here. According to a sticker on the bottom of my ECU, I have Version 3.0. and a date of 04 Did my Commander 950 come with a wideband sensor, or just the capability to run one? The Holley website states: All Commander950 ECU's now include Holley's new Pro software for increased tuning, data logging & optional wide band O2 operation. New wide band O2 unit available for infinite tuning and control of fuel & spark curves. It gives these 2 part numbers: 534-188 Wide Band O2 upgrade hardware 534-190 Wide Band O2 sensor If the O2 sensor I have is narrow band, do I need both of these part numbers, or just the 534-190 to upgrade to wide band? I also have a question on which base map is best suited for my application, which is as follows: 455 Buick Motor Intake: TA SP1 Single Plane Power range 0-7500 RPM Heads:TA Performance Aluminum Valves: Stainless 2.125 Int. 1.750 Exh. CFM: 300+ Int. 230+ Exh. TA head stud kit Headers: TA Shorty Headers 1 7/8 X 3 Camshaft: TA 310 Hydraulic Valve Lift Duration TA Rollers 1.65 @ .050 Advertised Intake Exhaust Intake Exhaust Intake Exhaust Lobe Center Power Range .515" .515" 232 232 284 284 110 2000-6000 Rocker Arms: TA 1313 Roller Rockers 1.65 ratio Cam Bearings: TA 1559 grooved Pistons: TA 1611 JE forged .038, 10:1 comp. Ratio Piston Rings: Total Seal Chrome Moly Connecting Rods: Crower Sportsman TA main stud kit Oil Pump: TA high performance oil pump assembly with external regulator So is anyone else running one of these with a similar setup? If so, Id be interested in a copy of your base map!! Thanks in advance for your help!
Thanks for the extra effort I actually got an answer to my questions off a Chevy board. :moonu: Here they are for those thinking of going the same way... "The IPU input is if you run a crank trigger to the C950 and have it trigger a CD box to control timing. I'd have Dave set up your distributor just like a small cap computer controlled HEI and run the HEI module on a heat sink. You have the latest firmware. It gives you the ability to run a wideband controller and sensor. You need the 534-188 which is the controller and sensor. The ECU does not have the control circuitry in it. I'm guessing you will make 550-600 HP. The key that drives a map is injector size and HP. Cam and idle vacuum determines idle tuning. There isn't a base "TBI" base map that is very close. I'd start with the 502sysmx map. This is for "MPFI". There is really no difference except you have to select TBI and the right 2-4 and 4-2 settings. Being TBI you might need more AE and coolant enrichment. This base map is for 42 pph port injectors. 2 x 42 = 84 pph, which is right at your 4 85 pph injectors. You can use a "TBI" for a "MPFI" system. They aren't much different if the total injector flow is similar. Sounds like a nice engine! " I will keep this board posted on how well this works just in case there's ever someone else who wants to do this.
Hi Bill - please dont get jaded on us just because nobody had the expertise to answer your question. There are quite a few of here who would love a EFI setup that will work on our cars and doesn't require a degree in computer science to make it work. Please keep us posted and good luck :beer :TU:
Nahh I'm not gonna get jaded on you guys, and I will keep you posted. I've picked up allot of tech here on this site, far too much to throw it all out on one post, anyway. If it wasn't for this site and the help of TA Performance, I wouldn't have made it as far as I did before the Commander 950. As far as needing the computer science degree, I'll be leaning heavy on Holley tech support, I hear they are pretty good. If I really get into trouble, there's a shop here in town with a guy who's got allot of Commander 950 experience. So far though, The install went well. Great directions and documentation. Now it sits until I get the ignition back from Dave (Ignitionman)
Hey there- Sorry, I know nothing about the Holley Commander. I might be able to help with some general tuning questions (such as explaining the concept of VE), or help out with some fuel system information. I used to run the Holley Projection, but that is altogether different than the Commander (maybe except for the fuel pump). Best of luck! -Bob C.
Just a note- the computer aspect of EFI might look confusing, but is generally pretty simple. The confusing part is knowing what to tune, what the difference abbreviations mean, etc., and I am happy to help anyone with all that! -BC
Well Guys, I finally got it going!! All I can say is OMFG! What a difference! Especially in the motor's tunability and responsiveness!!! The maps that fit closest to my engine were the ones for the 502 Chevy with the SysMax heads, intake and cam. I am running the Wide band O2 sensor from Holley as well. I still have a little fine tuning left to do, on Coolant Enrichment and Acceleration enrichment but the basics are done. It is so freakin' easy, I for the life of me can't imagine what intimidated me so much in the first place! I'll be out running it HARD this weekend. A couple reasons I went with the Holley system: 1). Complete system, everything you need is there including good instructions 2). Ease of tunability. Puts all the tuning at my fingertips, no reburn of proms. 3). Great tech support, product reliability. 4). Easy to upgrade the motor (Cam swaps) and the fuel injection (To MPFI) 5). Troubleshooting is easy, all the info is on one screen. 6). It is a performance TBI system, that will support my HP range, and future mods. So far, the only downside is the cost, but I've already spent the money, so that's behind me.
Andrew. I think his 1/4 mile times might be in the 30 min to 45 min time frame at around 1 - 2 mph!! :shock: If you check out Bill's avatar, that is the creation that has the 455. Believe it or not, driving at 1 mph can be white knuckle driving!! :TU: Here's a pic from All 4 Fun in Durango Colorado about 4 years ago. Man this is an adrenaline rush!!
Heheh! Don't think for a minute that me and my crew don't race to and from the trailhead! This buggy is more of a all around off road creation, that performs equally well in the rocks, sand, cinders, and dirt. Greg is right though my 1/4 mile times would be slow due to gearing. I've got the 2.75 1.57 low gear planetary in the TH400, and 5.13:1 gears in the differential. Add that to the fact that the TH400, Atlas II transfer case, Dana 60 rear, and 39.5" tires ALL eat allot of horsepower before it gets to the ground. Should be a good weekend. :Brow: One of my crew just put a bigger cam in his LS1 powered buggy. He's got a plain jane TH400, Atlas II Transfer case and 5.38:1 gears in his Dana 60's. At 3200 Pounds, He weighs about 600 pounds less than me, but I think I'll still smoke him. :grin: I'll post some pics from this Thanksgiving weekend, and if I get any video, I'll post a link to that for those of you interested. :3gears:
Definitely interested Bill. Post 'em up. I would love to see some!!! Bill, is it the 4:1 Atlas II xfer case? A friend of mine has one in a Bronco and loves it.
Yup it's 4:1. Had the option to get the 5:1 when I bought this one, but didn't see any sense in that considering the big blocks torque. BTW, Sorry for the late reply, I've been busy... Here's some lame pics (We never take pics when we do the cool stuff, I guess we always get caught up in the moment and forget the camera.. ou: )
Don't know if this board is like Pirate 4x4.com or not, so I'm posting pics individually to be safe... 56K BEWARE!
