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Messages - Josht

1
Engine Tech / 3.8 CFI questions
No it won't bolt directly onto a 4bbl intake, but it does match Holley's 2bbl carb bolt pattern from what I understand. I should be able to use a 2bbl carb to 4bbl intake adapter and be fine, the adapter would probably also be thick enough to that it would do what you are saying to do with the EGR plate.
2
Engine Tech / 3.8 CFI questions
Quote from: Old_Paint;283667
I take it you're calling the EGR Plate a spacer.  In fact, the spacer sits on top of the EGR.  The way it was explained to me, that spacer is to isolate heat from the throttle body.


Thanks for clearing that up. I did not realize that there was a spacer between the "EGR plate" and the CFI unit. In that case, if possible I will use the spacer, but since my intake has no provisions for EGR I will not be using the EGR plate.


Quote from: Old_Paint;283667
What the EGR basically does for you is enhance fuel mileage and keep the engine running cooler at cruising speeds by displacing some of the A/F mix with non-combustible exhaust.  Believe it or not, it does make a big difference in fuel mileage.  Without the exhaust being mixed with intake gasses, you have to fill every cylinder every intake stroke with fresh Air / Fuel mix.  This burns hotter than the diluted mix, AND, obviously requires more fuel to keep the same mixture.
 
You said you were hunting mileage.  Just thought I'd throw that bit of info in for you.  Despite the claims of some, EGR affects performance a LOT LESS than it affects fuel mileage.  There is a mild HP loss at steady RPM, but anytime you throttle hard or chop throttle, the EGR closes.  It's closed at idle and at WOT with the EEC-4, and is otherwise modulated based on ECT and EGO feedback to optimize fuel consumption and reduce emissions by reducing combustion temperatures and fuel consumption.  While the engine is cold, the EGR is closed to help bring the engine up to operating temperature quicker.  You're certainly not going to feel an EGR delete in the seat, especially on a V-6.


Interesting concept there, I'll have to study it more sometime. On this set up those exhaust gasses will not be helping to cool the engine. This intake manifold has no provisions for an EGR set-up and I'm not going to try to jury rig one onto it. If that means I don't quite see the full potential in MPG then so be it, it'll still be better than with the carb.
3
Engine Tech / 3.8 CFI questions
Big difference there on the venturis. I'll be on the look out for the 5.0 CFI, then when/IF I find one I'll put it on. To start with I'm mostly interested in getting the system and getting it installed. if that means the 3.8 CFI then so be it. From the sound of things the CFI out is easy enough that doing it later won't be a problem.

Quote from: jcassity;283216
Now you talking about not using CFI spacer,, ok,, sure.  Make it work.  Not sure why you would delete it.


I don't understand the reason to use the CFI spacer unless it will bolt directly onto an intake designed for a holley 4bbl square bore. Let me say this again. The 3.8L CFI system is being swaped onto a 2.8L V6 that has an aftermarket Offenhauser 4bbl intake installed. Part of installing that intake was deleting all of the truck's factory emissions system, including EGR, as such the spacer's EGR port is useless to me and leaves an extra hole I've got to block off.  If it won't bolt onto my intake I might as well pick up a an adapter to mount a holley 2bbl onto a 4bbl intake manifold. If there's something special about this spacer that I'm missing please fill me in.
4
Engine Tech / 3.8 CFI questions
Thanks for the tips! Mind if I copy this onto another forum for others who may do this swap.

Quick question, I know that the 3.8CFI is supposed to flow about equivalent to a 350 cfm carb, how about the 5.0 unit? Currently I'm running a 390cfm 4bbl on this motor, so I think that I'll be fine with the 3.8 unit for a while. If the 5.0 unit isn't to large I may keep my eyes open for one. Keep in mind that the motor I'm putting this on is one liter smaller than the 3.8L.

Yes I am currently running a mechanical fuel pump, but I was planning to remove it in favor of an electric pump. I have to check into what will work best for my swap, it will be either a 2.9L in tank pump which is a bolt on swap, or an inline pump. I'm leaning towards the latter since I plan to install a 20 gallon fuel cell in the future.

I'm installing this setup on a Ford 2.8L V6 which currently has a Offenhauser dual plane 4bbl intake installed. There will be no EGR port to block off. The only spacer will be a 2bbl to 4bbl adapter. This intake is the very reason I believe that I may decide to upgrade to the 5.0CFI in the future. Simply put it can flow a lot, probably a lot more than my heads can.
5
Engine Tech / 3.8 CFI questions
TurboCoupe50: I wouldn't fool with the 2.8 or the 3.8 CFI system if the engine wasn't a fresh rebuild. Hell if I had realized how much the rebuild was going to cost I would have done a 5.0 swap instead. It's done now and having just bought a house I can't justify spending the money on a V8 swap without at least trying to break this engine. As for the carb, as I said I can't tune one for ****. Besides it will probably cost me less to do this CFI swap that it will to buy all of the parts and an AFR meter to tune this Holley. I'd end up with a better running engine, better gas mileage, and not have to tune it again.

Softtouch: I can put one in each header, and be good to go. That's good to hear!
6
Engine Tech / 3.8 CFI questions
Hey folks I'm doing a 3.8L CFI swap onto a 2.8L V6 Ford Ranger I have. The Ranger currently has an Offenhauser 4bbl intake, and header back dual exhaust.

1) Since I can't use the EGR system will this cause a problem? What can I do to make the computer play nice without the EGR?

2) I will not be installing an air pump for the emission system on this engine, once again will this cause a problem? If so what can I do to work around it?

3) From what I saw in wiring diagrams it appears that this system uses O2 sensors. The left and right bank exhaust are completely separated. Can I get away with just one 02 sensor or is there a way I can set it up for an O2 sensor in each header. I have though about installing an X-pipe since I have to replace a ler and re-route the system a little, if I install the X-pipe could i just put the single sensor in there?



Since I know someone will ask "Why not just put a carb on it?" There's one on it now, a 390cfm Holley 4160, before that there was a 390cfm Holley Double Pumper on it. Well the reason I want this CFI system is because I'm no good at tuning a carb, and after having more knowledgeable people tune on it the mileage is still terrible (averaging 10mpg on a good day). I know of people getting twice the mileage after doing this CFI swap. I want the gas mileage, and since I'll never be able to match it with a carb, I am going to perform this swap as soon as I can source the components needed.

Any help that you can give me will be appreaciated. Any tips, tricks, or mods that can be done to this setup will also be welcome.

Thanks,
-Josh