accell is more pricey than holley i was just wondering who makes a better dfi. these are the only guys i know that make a dfi setup, who else is out there?

 

www.fuelairspark.com

unless you really need an aftermarket ECM for hp reasons or a big boost applicatoin, i'd just burn your own proms

 

I run the Holley 950. It cost me about $900 all said & done. It's more expensive then burning your own chip but it has some advantages. You don't have to remove anything from the car to reprogram. You program on the fly, while on the road, at the track, etc. This system converts your pre-90 MAF system to SD. It will also work with forced induction up to 3 bars manifold pressure. Holley also has an option for dry shot NOS. I figure why get all the equipment & learn to burn your own, only to find myself outgrowing the capabilities of the OEM computer.

 

i also read that you can get an adapter to plug directly into your maf or speed density wire harness...is that correct?

 

where'd you buy the Holley 950? That sounds like a good price for standalone.

 

I got mine from summit for~$800. Very pleased with the system. It came with harness, map and heated O2.

 

sounds sweet. With the Holley Commander do you get rid of the stock computer completely?

 

Yes

 

I too am using the Commander 950 with the 2.0 firmware upgrade on my GTO. Its a very good system.

http://www.chevytalk.com

There is an EFI forum on Chevytalk, and the moderator of that forum is Doug Flynn. He is the head EFI guru at Holley.

Andrew

 

Since you guys are talking about the Holley Commander 950 ECU, I have a couple of questions. I want to install a Holley StealthRam on my blown 1991 z28 (L98). The blower is a Vortech S-Trim (v1) and I'm currently using the hardcoded Vortech FMU. After I'm done rebuilding my motor, I wanted to goto a StealthRam intake, and do the 749 ECM (Sy/Ty) swap so I can tune the car at higher boost (I know I'm a cheapass). The StealthRam comes with the Commander 950 ECU. I didnt know it could be used to tune F/I applications. I thought It was going to piggy back the 749. Now I'm having second thoughts about the 749 ECM swap because it wouldnt make sense. The Commander 950 sounds pretty badass. Do you know if the Commander 950 ECU that comes with the StealthRam can do this out of the box? Or do i need any addons to allow me to tune F/I setups? Was $900 the cost of just the Commander 950 ECU? Know anyplace I can read up on the potential of the Commander 950 ECU? My blower has the potential of producing 680hp @ 20psi (1,000 CFM). I'm building the motor to handle 20 psi. But I'll only be running 9 psi untill I can replace some weak links in the drivetrain. Do you think the Commander 950 would be a good choice for me?

Thanks!!

 

Here is a bunch of information about the C0mmander 950. If you also look around the Holley site, you can download a PFD install and tuning guide. This will really help you see how cool it is. The only thing I would think you need are bigger injectors and possibly the 2.0 Spftware upgrade. With a blower you also want to make sure that you are doing your tuning with a wideband O2.

http://www.holley.com/HiOctn/ProdLine/Products/C950/C950.html


Andrew

 

So I'll need the Race Option to run the Wideband 02 Sensor. Looks like it will do everything I'm looking for. Thanks for the info guys!! I'll be contacting Holley shortly.

 

You will need the 2.0 upgrade if you want to run a wideband in closed loop. Its not really needed for driving. The widebands are pretty expensive and just add a level of complexity that is not really required. The most important thing to do is TUNE with a wide band. Once you get your fuel map dialed in, you can use a narrow band for part throttle driving. You never want to run closed look at WOT.

Right now I am not even using the narrow band O2. I got my fuel map dialed in pretty good, so I just run it in open loop all the time.

Andrew

 

Do you know how much the 2.0 upgrade and the wideband 02 cost? Right now I'm looking @ the complete kit with 42 pph injectors, but I cant find out how much it costs. I've seen the 30 pph complete kit for around $2,000. Not sure how much more the 42 pph kit is. My wallet is screaming @ me.

 

The 2.0 upgrade is about $250, and I use WBO2's from FJO which runs $568.

www.fjoinc.com

You'll also need a 2 bar MAP sensor.

You still could tune it on a chassis dyno with a WB and run it open loop to save some money. Just make sure your fuel system is up to snuff.

 

What Doug said...


Andrew

 

Sup, crazy. Are you going to drift session on saturday? If I come down I can show you how the Holley commander works. It's super easy to tune. I'd suggest you use it straight out of the box and see how it works for you first before spending a bunch of money on other stuff. I'm very pleased with mine. I just have to fine tune it.

 

I'll be there Cant wait to check it out. I've pretty much decided to go with the 749 ECM swap and burn custom chips, but maybe you can change my mind.

 

If you **settled** for updating the stocker, that'd leave you $600 to go faster with.
A Romulator saves all the work of removing a prom.

Most guys make more errors with on the fly then chip burning. Without stopping to note what you engine LIKES you won't see the trends forming. If you just using it for WOT at the strip that's one thing, if you want it CORRECT for on the street it's another.

3 bar manifold pressure is 48 PSI. A 3 bar MAP system works to +- 30 PSI.

You can get clever and use the stock ecm for NOS if you want. Getting real clever and you can do a 2 stage with the stocker.

How can you outgrow the stocker, when it offers more then the aftermarket ones (thou may require options)?.

 

That exactly why I decided to go with the 749 and burn chips. I end up saving enough to buy a new intake system as well. Good call Grumpy!! Sure it will take more of my time to tune it right, but thats 1/2 the fun with this stuff.

 

this may sound dum but what is the 749 is that the ecm and if so what s the dif i got 89 iroc 350 wich ecm do i have

 

Here's a quick rundown for ya 750gixxer

749 ECM - ECM from 91-93 GMC Syclone/Typhoon. This ECM comes with a 2 bar map sensor and can calculate A/F ratio's from Vaccum to 14.5 PSI of boost. Swapping it into your 3rd gen will require you burn custom EPROM's. Cost effective alternative to Aftermarket DFI.

730 ECM - ECM from 90-92 Speed Density TPI setups. This ECM in the stock form is good for N/A motors. It comes with a 1 bar map sensor which can calculate A/F ratio's from vaccum to 0 PSI or regular Atmospheric pressure. In the stock form, the 730 ECM is not a good choice for boosted applications. But the 730 ECM can be modified to act as a 749. It will require you re-pin the ECM and burn custom EPROM's.

165 ECM - ECM from 86/87-89 MAF TPI setups. This is the Mass Air Flow TPI ECM, does not include VSS either. Pretty much a baseline ECM but works OK for MAF N/A setups. (this is the ECM you have - 89 w/ a L98).

And then the rest of the stuff discussed here are the Aftermarket DFI ECM's. Holley Commander 950 and the other stuff are all non GM ECM's. Fairly expensive DFI units that include real time tuning abilities.

 

Does someone make a jumper harness to adapt the Holley ECM to the TPI factory harness?

I too have been considereing doing the 749 ECM change when I add the boost. I also have been throwing around an aftermarket ecm.

 

That's a good question... One that I've been trying to find the answer to, with no luck so far. Anybody? - John '89 L98

 

I tried to get an answer from FAST regarding whether or not they offer a jumper harness to adapt to the factory harness. They replied to me by saying that the ECM comes with a complete harness. I tried to look at the Holley webpage and it shows a part number for a TPI application, but no description. If you have any better luck, let me know...