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Old 11-30-2005, 09:23 AM   #1
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Fuel injection- Horse power- Help! 454

Hello all
I have a problem that I hope you may be able to help me with. I am in the process of restoring a 1978 Argosy 28 on a p-30 chassis with a 454 chevy engine. I am about to convert to fuel injection. I have been looking at the Holley 950-22s 4-bbl system. My problem is that I don't know the horse power of my 454. Holley has four 950-22s systems that range in horse power, 150-300 hp, 250-440hp, 375-500 hp, 450-575 hp. Would anyone have any experience with this type of conversion? Or would you have any suggestions that may help me with this conversion? I would appreciate anything that you can do.
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Old 11-30-2005, 12:10 PM   #2
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Maybe if you google on 1978 P-30, you can find the specs somewhere. My MH is an 84 so I think it would be different than a 78.

Keep us posted on your progress, I have thought of adding FI to my rig so I would love to hear of the experience of someone who has actually done it
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Old 11-30-2005, 03:10 PM   #3
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My 2000 GMC pickup had the last of the 454's in it. It was rated at 290 HP, if that helps you any.
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Old 11-30-2005, 04:17 PM   #4
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I believe it's ~190-200HP; not much. . .
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Old 11-30-2005, 04:25 PM   #5
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I think your motor runs about 225 Hp or so not to much at all. My feelings on the holly stuff is to good. Try calling Howell http://www.howell-efi.com/ they have more of a "factory setup" . I had much better luck useing there stuff.Goodluck Jim
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Old 12-01-2005, 08:14 PM   #6
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Thanks for all of the feedback. Good information concerning this kind of conversion is not so easy to find. I have learned quite a lot just browsing these pages.
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Old 12-01-2005, 08:47 PM   #7
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I've have done the upgrade on my '83 310 MH and I used the Holley 950-23s. If flows 650 CFM and if you assume that 5000 rpms is your top limit, the 23s will do nicely. If you went larger setting up the idle would be harder to do. PM me if you want to hear about all my adventures with the conversion.
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Old 12-02-2005, 06:47 AM   #8
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the Holley set up is a throttle body? Forgive my ignorance on the model#.
What other changes do you dso to go to that from a typical quadrajet set up?
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Old 12-02-2005, 08:57 AM   #9
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I know for my engine I will need to replace the distributor. The Holley kit needs a magnetic or hall effects crank trigger system with after market cd ignition system. That is if you don’t have a GM 7 pin distributor. Then you use Holley’s wiring harness adapter (P/N 534-47).
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Old 12-04-2005, 10:55 AM   #10
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Factory TBI form a 87-89 454 GM truck will bolt on in place of a Quadrajet. Just need a speed sensor for the ECM and put a FI cam in it. All the rest is factory parts availabe at any parts store.
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Old 12-05-2005, 02:12 PM   #11
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I want to point out to our new users that these forums are intended to be a resource. This resource is only as good as the info that is available when you use the search function.

While I will gladly help out anybody that sends me a PM I feel that I can better help the forums if you ask the question in the thread that you had the question from. That way it will become a resource for others that may have the same question.


I have taken the liberty to post a question that was posed to me in a PM in reference to the post I made above.

Quote:
Originally Posted by Stantank
Hi 59toaster
Quote:
Originally Posted by Stantank
Thanks for responding. If you have done this type of conversion could you relate to me how it went for you and if it is worth doing. I have no idea where to start.
Thanks
Stan
I have the parts but have not done the conversion. I sold the truck I intended to put the system on. Then I changed course on the 1970 Pontiac Lemans I am working on that I was thinking of using it on and decided not to use it on that…(Demon 750 on a high rise looks a little more imposing). It happens to be the exact same FI that is on my 88 454 Suburban so I am holding onto the parts as spares.

I know several people that have done the conversion. Most that went with a FI cam profile if the engine was the same displacement and made sure to add a speed sensor and knock sensor have had very good luck. The computer is what you are matching the cam profile to. You will have to do a little reseach on engine the computer came off. The throttle body that is pictured above has the same plugs that were used on a 350 motor with the FI intake. That TBI will let you bolt on in place of a Qudrajet and sve you from having to replace the intake.


If you have a damaged or missing harness http://www.affordable-fuel-injection.com/, http://www.howell-efi.com/, http://www.painlesswiring.com/ and www.customefis.com/ (site seems to be down so check back) can make you a custom replacement.


You can get a custom chip burned that will allow you to use the stock cam but I hear mixed reviews. The profile of a FI cam is different. A Non FI cam may play hell with the MAP sensor. I think some of thproblems I hear about comes from people also trying to bypass stuff like EGR and speed sensors. It becomes a real hit or miss when you request a chip burner to do that. KEEP THE EGR. EGR helps fuel economy. It does not hurt performance.


Customefis has some shareware that you can turn a laptop into a data logger for factory GM FI. With that information John can burn you a chip. I believe Affordable and Howell also offer those services.

If you hit http://www.jagsthatrun.com/ they have some good conversion info including info on a drive through speed sensor that will let you retain stock speedo but still get the signal the EFI needs. In the stock application the speed sensor was was a optical sensor in the back of the Speedometer till the round body trucks came out. http://www.thirdgen.org/ you will find some forums that have heavy GM EFI content.
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Old 12-06-2005, 06:23 PM   #12
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I want to be able to make changes in the chip myself. This is why I have been looking at the Holley 950 kit. Also I don’t think that I could figure out the appropriate combination of parts for my engine without using a kit. I think that the programing is fairly straight forward, at least it is with the Holley. Could I put the part together as you have and use the Holley software to program the chip?
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Old 12-06-2005, 07:03 PM   #13
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Question Edelbrock

Stantank,

Have you checked out the Edelbrock Pro-Flo system? Why not modify fuel and spark curves at random as desired on the pad (included with the system - no laptop required) instead of programing chips. This system would seem to have many advantages in your application. The kit is sort of pricey but very complete and very dependable - I run one on a 454 chevy in a 1978 Monte Carlo. I will share more if interested!

Just my two cents.

Regards,
Henry
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Old 12-06-2005, 07:52 PM   #14
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Axleman,
Thanks for your input. I looked at the no laptop Holley system but it only runs the two barrel throttle body. Will the Edelbrock work on a 454 in a 28’ Argosy G.V.W.R 12,500? Or will any two barrel throttle body give me enough power? I would be very interested in your feedback
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