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Old 01-01-2002, 09:30 AM   #1
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Holly Commander 950 vs Edelbrock Pro Flo EFI ?

I am planning to install an MPFI stsyem on my '82 Z28. Once I get my 406 sbc details worked out. I am hpoing to make it my summer project (last summer it was my 1LE brake conversion). I want to get as many details sorted out as I possibly can. One area that I have no experience in is the MPFI. I am from an era where the carburetor ruled,etc. But I want an MPFI system for all the usual reasons.

My question is; what is the difference between the Holly Commander 950 MPFI and the Edelbrock Pro Flo EFI (3500) Systems? I notice that the Holly system is much more expensive. $2,499.95 vs $1,925.00 for the Edelbrock. What is it that makes the Holly system nearly $600.00 more expensive?

I am sure that someone knows the answer to these questions.

Thanx,ANDYZ28
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82 Z28- 383 roller w/Vortec heads Edelbrock Performer Vortec intake, Edelbrock Q jet, serpentine belt drive.TH700R4 w/B&M holeshot 2000 converter,& megashifter.1LE front brakes, 9bolt 3.27 w/1LE rear brakes.Aluminum driveshaft,boxed rear susp. poly everything, IROC swaybar+wonderbar and steering box. Spohn subframe connectors. 70mph@2200rpm ASE Master Tech plus L2
also Latest project car,'86 IROC stock 305TPI hit on left side,but not too bad ( now repaired and equipped with the 1LE brake system). Also 1990 IROCZ 5.0 TPI 5 speed (drive train has 150 miles since new), and another 1990 IROCZ 5.7 G-92 etc., and yet another 1990 IROC-Z, red w/flames, and 1988 IROC-Z convertible, red w/59,000 miles.

www.andyz28.com
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Old 03-06-2002, 05:58 PM   #2
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As I understand the Holley is realtime programmable and the Edelbrock is not.
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Old 03-06-2002, 06:19 PM   #3
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I'm sorry. But I don't know what that means?

Thanx,ANDYZ28
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Old 03-06-2002, 08:06 PM   #4
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Holley has progressive nitrous control built-in.
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Old 03-06-2002, 09:28 PM   #5
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Acording to Edelbrock engineeres. The (my) 406 SBC will produce 497 ft lbs of torqe at 4,400 RPM. With just over450 HP. This is a casual street machine. So I probably won't run nitrous.

But I am after the cold start,A/C load compensation, knock sensing,etc. If possible. But I do not know enough about either system. It would be a big help to get a copy of all literature that comes with these systems.

Thanx,ANDYZ28
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Old 03-06-2002, 10:38 PM   #6
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The holley system can be optimized with a laptop while the engine is running. There is no need to pull over and shut the vehicle down to tweak your setup.
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Old 03-06-2002, 10:53 PM   #7
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I think you should check out this thread first.
http://www.thirdgen.org/techbb2/show...=950+commander
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Old 03-07-2002, 04:57 AM   #8
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I read that post. I don't understand it all. But it doesn't sound too good to me. The refrence to the OEM ECM being better. Can I run an OEM system on my 406? Many people have told me that the TPI will not flow enough, even with hogged out (ported) components.

But I will say again, that I only know what end result I want. I just don't know enough about these things to make an intelligent decision. Every word you guys have posted has been an education for me.

Thanx,ANDYZ28
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Old 03-07-2002, 12:17 PM   #9
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The stock TPI would not perform well on a block larger than a 383. However there are TPI setups designed exclusively for big blocks. If you can run a Big Block with TPI you can run a 406. If I remember correctly TPIS carries big block systems. www.tpis.com

I checked they got pieces of a big block TPI setup.

I recommend the book "CHEVY TPI SWAPPER'S GUIDE" I got mine on ebay and it really helps you understand the TPI system.
http://cgi.ebay.com/ebaymotors/ws/eB...tem=1810939638

Last edited by dennis6; 03-07-2002 at 12:41 PM.
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Old 03-07-2002, 12:35 PM   #10
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You might also want to check this link out:
http://www.tunedport.com/bigblocktpi.html

Hope all this helps.
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Old 03-07-2002, 06:18 PM   #11
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So the GM OEM system is actually better?
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Old 03-07-2002, 07:11 PM   #12
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I think you should check out this thread first.
http://www.thirdgen.org/techbb2/sho...t=950+commander

That post is 2 years old. I assume it is about the previous ECU Holley sold. The current version is very capable. I've tuned 24 PSI blower engines and 900+ HP NA engines with it.

Go to chevytalk.org and see the EFI section if you want some facts.
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Old 03-07-2002, 10:24 PM   #13
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IMHO I think the OEM is better. You have to program both the OEM and Aftermarket systems. With the OEM you can have someone burn a chip for you and help is available from this board. The Holley system is interesting, but the price is kinda steep and support is not as easily obtained (read: fewer people have expierence with the product).
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Old 03-12-2002, 03:59 PM   #14
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BTW Doug F thanks for the link to chevytalk that I think I got from you. Anyway the EFI board is very informative.
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Old 03-17-2002, 08:35 AM   #15
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So the GM OEM system is actually better?

This depends on what you are using it on. Before you make a decision as to what to buy check out the DIY PROM board of this site. It will give you quite a bit of insight into what the OEM system is capable of. My advice is to decide what features you want and then see if the OEM ECM can handle what you want to do. The system will not handle 24 lbs of boost or 900 HP because of special requirements. The aftermarket systems pretty much belong on race cars. They are not as developed as the OEM systems(No one can afford to spend billions on this except for the OEM) and they cost more to maintain. With the OEM you can get an extra ECM from a yard for about $40 to repair your aftermarket starts at around $400. Add to the top of this that if this is your driver you are walking. I guess my point is do your homework and choose the system that is right for your needs.

HTH

John
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Old 03-17-2002, 08:35 AM
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