Im looking for people out there that have
used the commander 950. Most places are trying to sell what they sell and not what
is in your best interest. Most Accel EMIC
center are not interested in tunning you system unless they get there pound of flesh
selling it to you.Mail order pricing will drive local speed shops out buisness.Its there own faults because. Ive found that
they are not as knowledgable about the parts that they sell as you would think.
So what is the benefit of buying locally?

 

What do you want to know? I am an Engineer at Holley and have tuned many street and race cars with this system, including my own. I am always honest and am familiar with other systems too.



------------------
Doug
72 388 EFI Nova
Chevytalk.com EFI Moderator

 

Is it user freindly?
What speed of laptop do I need
386 486 or pentium?
383 Stroker 5.7 rod
Sportsman IIs
Superram
24 or 30 ib injectors?
52 or 58 mm TB?
224/230 .050 503/510 lift
Will your base maps get me closeto this?
Will I see 400HP at the flywheel?

 

It is windows based and much more user friendly than calmap 6.xx or DOS Speed Pro (FAST). It provides real time tuning when the engine is running just like any good system.

You can use any laptop with windows 3.1, 95, 98, and it has worked with the ME machines I have seen. The slower the processor, the slower it will be. I'd recommend at least a 486. I personally prefer laptops that are a little older like a Win 95-98 machine. A lot of the new laptops are starting to do things like not providing DB9 com port etc and you have to get add-ons. I also prefer not to use $3,000 laptop when running around tuning cars.

My own personnal car is a Nova with a 388, very old ported Dart II's, converted single plane and 30 lb/hr injectors. I have maps for two cams, 224/224 525 lift and 242/248 570 lift solid rollers. It's a full street car and runs 12.1 with the second and 12.5's with the first. The small cam map will be close to yours if you use 30's. For 24's you can just do a percentage offset to the map to start.

I also have several other 383 maps. All of them are for 400-450 HP engines similar to yours. The software comes with all of these any many more base maps.

You definately will see 400 HP at the flywheel with your combo.

We have a new instruction manual that you can check out too that may help answer your questions. Find it here under August 1st.
http://www.holley.com/HiOctn/WhatsNew/WhatsNew.html

However, you will ALWAYS have to do fine tuning for your car. EVERYONES's base maps will require fine tuning to provide the benefits EFI will deliver.

Hope that helps some and I would be happy to answer any other questions.

------------------
Doug
72 388 EFI Nova
Chevytalk.com EFI Moderator

 

Does the small cam base map appear on the commanders software?
Is there any way that you can sendme other base maps for my engine combo.
Will this engine have a noticable idle.

 

That map is on the base maps. I could send you all the maps you would like by email, but you need the software to view them. I could email that to in self extracting zip files. Let me know.

I would say it would have what I call a "noticable" idle, but nothing too radical.

Adding extra advance at idle will really smooth out an engine.

 

Regarding the Commander 950, can you help me get pointed in the right direction? I purchased 2 4bbl Holleys (700 and 900) bare that I was told would work in a stock ecm, but then after I investigated more, it seemed like a bad idea. I understand that Holley offers a "retrofit" 950 kit with all the sensors, harness, software, ecm, everything to use on the 4bbl. Can you give me anymore information or links? This is going on a 6" rod Vortec headed (mild cleanup) stock crank 406 (KB -18cc pistons). Any thoughts on cam and intake manifold, some say single plane for efi works as good as dual plane as low end vacuum isn't needed. I don't want more than a slight idle and redline will be 5500, so this really is a daily driver. Thanks for any input. Skip

 

Skip,
The injectors in the 900 cfm unit will be way to big at idle (85 lb/hr). The 700 will work fine, it has 65 lb/hr injectors which are plenty big.

You can order pn 950-100 and it comes with ECU, Harness and software to upgrade.

This is something that might help.
http://www.holley.com/HiOctn/ProdLin...TB/C950TB.html

 

Doug, will the 670cfm tbi 2barrel unit support over 350hp with 90lb injectors run by a 950 commander? I am currently building a 350 for my 91RS and want to keep it tbi. Am I going to run into trouble, I want to keep the cost down as much as possible and I already have a 670cfm tb. Thanks for any info you are willing to give.

 

Should I be running a 52 or 58 MM throttle
body with my engine combo ?

 

Go with the 58 mm

The calculation for injector sizing is

Inj size = HP x Brake Specific Fuel Consumption/# cylinders x duty cycle

This is for a multiport, so multiply the answer by 4.

If you assume a BSFC of .45 and a duty cycle of .9, then 90 lb/hr injectors at rated pressure equates to 360 HP.

Depending on your injectors, you can raise the fuel pressure.

So, not an exact answer, but I'd say much over 360 and unless you can raise the fuel pressure, you might be in trouble.

You can use the Commander 950 to control it.

Hope that helps some or provides input for more questions.

 

Thanks Doug, it helps.

 

This rocks, a Holley engineer right on the site helping people! Doug, I'm wondering if you could help me out with a couple questions too. I'm planning on adding the whole Commander 950 MPFI system to a daily driven carbed 383 over the winter. Engine is 10.25:1 comp, Edelbrock RPM heads, Crane hyd roller cam 234/242 @ .050, .539/.558 lift, 112 lsa.

Do you think I'd be better off going with the 350-450 HP system with 24lb injectors, or the 450-550 HP 30lb system? I'm hoping it will make close to 450 HP, but I don't want to limit it with injectors that might end up too small? Any advice?

Also, I see the only base map on the Holley site for a 383 says it works best with cams smaller than 230 @ .050. Does it come with more base maps when I buy it? Or would you be able to provide one to start me out closer? Thanks for any help/advice!!!

 

BowtieNut,
There is no question. Go with the 30's. Injector size depends heavily on an engine's BSFC (brake specific fuel consumption). Holley overates the systems in my opinion.

The map I have for my 388 would probably a very close starting point. 30 lb/hr injectors, a solid roller with 242/248 @.050 with a 110 ls. Engine makes around 430 HP. Runs 12.1's in a 3500 lb car. I could send it to you, although it is included in the latest map disk also.

The EFI works great with that engine.

 

Doug,
Thanks a ton! I know alot of people tend to over-carb, and I've heard this so many times I tend to go the opposite, and I'm sure I would've ended up getting the 24's.

I don't know much about BSFC, but here's some extra info if it matters. When I first put the engine together, it had a smaller cam (ZZ9, 211/225 @ .050, .483/.522, 112 lsa), Rerf RPM QJet intake and Holley 650 vac, and was run on the dyno in this form. It made 380 HP @ 5100 and 433 TQ @ 3900. BSFC was .46 to .48 across most of the rpm range. I have no idea how much this changes, but I thought I'd throw the info in anyways.

This is all in a 3200 lb S-10 2wd, with TH700r4 and 3.73's. I'll be extremely happy if I can get low 12's out of it. If the map is on the current disk, I don't imagine I'll need it now. I'll be buying this system in December, so I'm assuming I'll get it with that. I've already read through the entire tuning manual online. Thanks again for the help!!!

[This message has been edited by BowtieNut (edited October 19, 2001).]

 

doug i just purshased stealth ram mpfi for my 436 made 585 hp on dyno with
750 hp carb cam specs are 248/254 lift is .616in 622ex. with 1.6 rockers
is there a base map that will work for me .im using 42lb injectors