Has any one installed one of the Professional Products Powerjection 3 units. If so how do you like it? I asking because i am thinking about changing my current set-up. I'm currently running a duel quad set-up with 2 edelbrocks. They run good but the car is very cold natured. The set up of the Powerjection looks easy. I was just wondering how it would perform and if they give any problems.
I am a bit leary of the setup since the electronics are mounted direct to the throttle body. You might take a look at the FAST EZ EFI systems. They look to me to be a more well thought out setup (I have been selling a ton of them) though they look a bit less like a carb. -Chris
I wouldn't be concerned with the ecu being a part of the assembly. The Chevy RamJet has had it attached to the back of the manifold from the beginning and any of the EFI marine applications have it mounted right on top of the engine.
I had good luck with a plain old GM trottle body. Used a Buick computor for normal driving and switched to a COPO police computor for power. Just my thoughts..
I've been looking at both the Retrotek Speed Powerjection 3 and FAST EZ-EFI for my daily driver, and can't decide on which one to go with. Here are a few threads I've been following: Powerjection 3 http://www.stangnet.com/mustang-forums/740997-retrotek-purchase.html http://www.stevesnovasite.com/forums/showthread.php?t=137954 http://www.motorator.com:80/videos/702 EZ-EFI http://forums.corvetteforum.com/c3-...-f-a-s-t-ez-efi-is-anyone-using-this-yet.html http://www.theamcforum.com/forum/fa...ge1&SID=ce52c1f5b873dfb95zabfdd239641845.html http://www.superchevy.com:80/techni..._1001_ez_efi_fuel_injection_system/index.html http://www.motorator.com:80/videos/841
I'm with Panic,,,you should be able to adjust the problem out of your carbs,,,unless ,,,you just really want injection,,and this is an excuse to change. Carbs work great if they are right. Tommy
Well I do have to admit that I would like to try injection, but the car being cold natured isn't the only problem. 1 of the carbs was leaking down I corrected the problem, and now the other is leaking down. Also with the low vacuum signal that I have due to the long duration cam shaft the carbs are quite sensetive. The have to be just right. The edelbrock carbs have done a better job as far as needing less adjustment. The holleys I had before the edelbrocks were S.O.B to keep adjusted. While the Holleys seemed to perform better at W.O.T The idle was always rich. If I corrected the idle I caused all sorts of other problems. The Edelbrocks balance the two much better, but give up a little on the top side. I was thinking maybe one of these injection units would give me the best of both worlds. It might be wishful thinking, but I would be willing to spend the money if I thought I could slove these issues.
JMO but if it's for your avatar '55 I would think twice about it. Nothing nicer than duals on a try 5! If you do go with an FI unit stash the duals as you will probably want to go back to them when the FI fad where's off. That type FI has it's place but not on a "55. Do as Panic says and spend some time on fine tuning the carbs and chokes and other tune up specs. JMO again...........
Will the cam you have work with the efi your looking at ? Back when efi was the thing many guys were over camming their engines and the efi didn't work out for them. Just a thought. My 5w has tpi and a corvette cam. 1985 stock. Remember return lines pump and location. Also the type of filter and its location. I think you'll love it when you get it workin g. JMHO
What a coincidence! I have a customer coming today that i am putting one of those units on his car and doing a before/after dyno test to compare it to his carb. Not really a hamb friendly tech piece but i'd be willing to document it and give you the reults, just pm me with your email. We are doing the before test right after lunch today, this afternoon i'll do the swap and depending how much tweeking i need to do the 'after' test will be done thursday or friday.
All points being talked about are good ones. I do really like the look of the dual quad set-up. And what makes it even cooler is that there on an old offy intake. I was thinking if did do the swap I would do some sort of cool air cleaner. Maybe a Walter Posner. Like I said I haven't made my mind of yet. Maybe After oj does his install and dyno I will have a better idea, or at least more info. oj I sent you a P.M let me know how everything works out.
From what OJ is saying he is replacing a 1 carb car with an EFI, I will predict that the results will be a better starting car (if he was having starting problems with carb) a little better gas mileage, same or a little better top end depending on how well the carb was set up to begin with, and better throttle response. Comparing this car to your dual carb bigger cam '55 will be apples and oranges. To get the top end performance you want to keep you will have to step up to a larger EFI unit and if not changing out cam you will need all the tuning capability's on the EFI as possible. Another JMO.
brigat, you make a good piont. I forgot to mention that my car is a Big Block .030 over 454. That being said its my experience that big blocks seem to be more temperamental as compared to small blocks. As you have said I may need a larger EFI unit. I guess i shouldn't be trying to fix something thats not broke. I guess Im just trying to find another project. While I do drive my car a good bit its not a daily driver. I can't say that I'm dissatisfied with my current set-up. I just thought maybe I could improve on the overall performance. I like the Idea of being able to just reach in the window and start the car. While fuel mileage is not a real concern I have heard that these type of units improve mileage. Throttle response is good with I have, But I would welcome as we all would an improvement. I could be wrong but I think the biggest gain would be in Idle quality. That why I was asking for some feed back from people who were running one of these units. If I'm not going to gain improvement in some of these areas then I'm pissing in a fan I don't want to spend 2 grand or more and notice very little differance. Maybe I should just drag up another project and go to work on it, and get my mind off changing what I've got. In a nut shell what I'm saying is I'm not dissatisfied with I've got I just would like to improve a few things.
You could probably keep your dual quad intake with the EZ-EFI setup and still make the power you need. Heres the link for the pic above http://forums.corvetteforum.com/c3-...-f-a-s-t-ez-efi-is-anyone-using-this-yet.html
Leave it to panic to make some smart ass non helping comment. Ask panic about his engine. Sounds like you are ready for a supercharger assuming your compression is not real high already.
A number of people wanted to see the results and asked me to post them. We have done the 'before' dyno test. The engine is a 331 ford, the existing carb is a holley 4777/4150 (650cfm double pumper), i don't have cam specs but the thing didn't come to life until 4K rpm, we had a 6K chip in the msd, @5700 rpm is made 310hp with 286ftlbs torque (max torque 294 @ 4900 rpm), the afr was lean @ 13.4/5 (the air here is very dense right now, summer was when i set up the carb). The injection i am replacing the carb with is Professional products Powerjection III #70020, no other changes to be made. If all goes well we'll have the results tomorrow. The pics are existing engine & the Powerjection III unit Any comments/thoughts/suggestions/advise post 'em up. Later oj
oj, Thanks for posting, we greatly appreciate it. I've understood it takes a bit for the computer to self tune itself, so you may have to drive it around a bit before it gets it's act together. Thanks again.
I'm a newbie and just found this thread, I was planning to do the same on my 408 ford stroker (dyno before and after with my mighty demon), I have the powerjection 1 with ignition control I havent installed yet, I'm guessing a few more hp and a big jump in TQ, I am curious at the results as well.
I just got back from doing the dyno test. I had some problems installing the powerjection III unit, that and weather delayed this test. The installation was simple, directions very clear and tech help/advice was friendly and informative. The problems that i encountered were not the fault of the unit, they were problems that were in the car itself and had to be dealt with in order for the electronics to work (with the carb on the car the problem was non issue). Tuning the powerjection III is a little more complicated, yes it will self learn, but there are a ton of things to deal with. As usual in hot rodding, it isn't as simple as you think. I've played with and driven this thing for a week and still have areas to improve upon. I will tinker with it for another couple days, it is fun to tinker with. The dyno show peak hp of 314 @ 5800 rpm; 290#s torque @ 4600 rpm; fuel went a little lean on me around 5200 rpm with 13.4afr. I could have made further fuel curve adjustments and made better power but the cam needs to be advanced. Any time tuning for power would be wasted effort, i am going to concentrate on tuning for driveability and begins plans to either degree this cam or replace the cam entirely.
So far not alot different than the carb, but like you say more tuning in order. Hows throttle response? Thanks for the update!
To be honest, i really had the carb nailed, it will be hard to improve upon it. The immediate benefiy is that the engine is cold natured and with the injector it fires right up and is immediatly driveable. The owner would have to let the car get to operating temp with the carb. I think the big issue is the cam in this car, it breathes good but i can't get the thing to idle right at all, with the carb it wouldn't do anything under 1K rpm, the injector i've got it at 750. The cam must be retarded and is affecting the idle quality, it is lumpy but the rythim isn't right. Throttle response is very good and strong up to about 110mph and you shift into 5th if feels a little weak but i'm working on that. later, oj
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