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Old 10-12-2015, 06:30 PM
Joel Koontz Joel Koontz is offline
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Link to info regarding 4.2 vs 4.9

http://www.ecotrons.com/technology/b...su_42_sensors/

  #202  
Old 10-12-2015, 10:42 PM
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Which intake manifold works best with the FITech unit.
I'm currently running a stock '67 intake and want to purchase one of these units.
Thanks

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  #203  
Old 10-12-2015, 11:45 PM
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You will need an adaptor with any manifold that is a spread bore. Beyond that the best manifold is the one that you would run for whatever engine combination you're running.

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  #204  
Old 10-13-2015, 05:46 AM
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I think 67 was a transition year, you may have a square bore intake already. What carb is on it currently?

  #205  
Old 10-13-2015, 07:34 AM
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Quote:
Originally Posted by angelo View Post
I think 67 was a transition year, you may have a square bore intake already. What carb is on it currently?
In 67 you could get either an AFB or a Q Jet depending upon the application. GTOs and F bodies with 400 engines used Q Jets, full size cars and 326 4 bbls used an AFB. The AFB is of course the square bore base. 65 and 66 intakes are also square bore and will fit the 67 engine.

428 engines, if I remember correctly, also used the Q Jet in 67. Most of the high performance engines were using the larger carb Q Jet, while all the standard 4bbl applications used the AFB, except for the 326 HO. The AFB suited the smaller engine better.

66 4 bbl intakes were all square bore AFB intakes and will fit the 67 heads. By 68 all 4 bbl intakes were spread bore for the Q jet. In 68 the 326 gained 24 cubes and the 350 engine received the Q Jet for 68.

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  #206  
Old 10-13-2015, 10:18 AM
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from a performance aspect the AFB intake should be relegated to 350's or less engine sizes

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  #207  
Old 10-13-2015, 03:32 PM
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If it already has an AFB intake I would keep it, would make the FiTech swap easy. I wouldn't swap to an AFB intake though. The spread-bore intake design is obviously more thought-out when you comparing them side to side. The thing that surprises me is how the tri-power intake even worked as well as the 4 barrel intakes, each runner is a different length depending on if the 1st and 3rd carbs open up or not.

If I ever have to get into the engine, I will grind away the spread-bore holes on my intake so I can mount the FiTech directly to it. Being a practical person though I'm not about to tear into the engine to do just that. I will reserve the right to change my mind on that one though!

  #208  
Old 10-13-2015, 07:08 PM
Joel Koontz Joel Koontz is offline
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Quote:
Originally Posted by angelo View Post
If I ever have to get into the engine, I will grind away the spread-bore holes on my intake so I can mount the FiTech directly to it. Being a practical person though I'm not about to tear into the engine to do just that. I will reserve the right to change my mind on that one though!
So the issue with a spread-bore intake is that the primary holes are too small?

Just grinding that area out a little bit would allow the FITech T/B to fit without an adapter?

Anyone have a photo of a square-bore gasket on a spread-bore intake?

  #209  
Old 10-13-2015, 08:21 PM
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I believe there are also gasket seal issues on the secondaries as well. If you go through the earlier parts of this thread I believe that was discussed with photos as well.

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  #210  
Old 10-23-2015, 07:21 PM
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I called FiTech tech support and spoke with Brice. He said the 4.9 sensors should be phased in within the next couple of months and hopefully fully tested by the 6 month mark. He also said their $995 price will not change as a result of the change.

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  #211  
Old 10-27-2015, 01:29 AM
Nicks67GTO Nicks67GTO is offline
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Quote:
Originally Posted by grivera View Post
I called FiTech tech support and spoke with Brice. He said the 4.9 sensors should be phased in within the next couple of months and hopefully fully tested by the 6 month mark. He also said their $995 price will not change as a result of the change.
Excellent. They're supposed to have some new products pon the market showing up at SEMA. I called and tried to pry it out of them but they wouldnt budge....i guess we will wait and see whats up

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  #212  
Old 10-27-2015, 01:03 PM
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On the web site FAQ, it says that the system is E85 compatible. Does that mean that you can run either gasoline or E85, like a modern Flex Fuel vehicle, or that you have to set it up to run one or the other?

Having a flex fuel Pontiac would be awesome.

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  #213  
Old 10-27-2015, 01:48 PM
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E85, I don't think anything else has to change other than reducing the output claims of the system by 25-30%.

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Old 10-27-2015, 01:58 PM
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Quote:
Originally Posted by Junkyard Dog View Post
On the web site FAQ, it says that the system is E85 compatible. Does that mean that you can run either gasoline or E85, like a modern Flex Fuel vehicle, or that you have to set it up to run one or the other?

Having a flex fuel Pontiac would be awesome.
The tune has to be different, you can't just fill up with whatever you want.

The computer uses lambda from the oxygen sensor to measure stoich which is obviously different between gasoline and ethanol. 1.0 lambda is always 1.0 lambda though, so the system knows what it's needing.

For the FiTech system what you would need to do is start with whatever fuel you want and build the tune either by hand or through self learning through idle and driving operations. You then save that tune in the handheld or on a USB, reset learn and do the same thing with the other fuel.

You can then load the tunes as needed when you change fuels. It's important however (especially going from the gas tune to e85) that you have a full tank of whatever you're running, not mixed.

With that said, if you're wanting to run e85 at all, you'll want to get the Go EFI-8. The basic 600 hp configuration will only support about 420hp at max injector duty cycle. Pontiac's have fairly crappy BSFC so anything over 400 hp and you're running the system at the ragged edge. Most performance builds on these engines are in the 400-450 hp range, so you need the extra headroom.

The 1200 hp system should support about 800hp max on E85. The Bosch 041 that they provide in the inline kit will max out at about 700hp on e85 and their command center should support about 800 on corn assuming the fuel system behind it can keep up.

Plan on replacing your fuel tank. My factory '69 tank doesn't vent well enough to stop a vacuum from starving the inline pump.

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  #215  
Old 10-27-2015, 02:06 PM
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Quote:
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With that said, if you're wanting to run e85 at all, you'll want to get the Go EFI-8. The basic 600 hp configuration will only support about 420hp at max injector duty cycle. Pontiac's have fairly crappy BSFC so anything over 400 hp and you're running the system at the ragged edge. Most performance builds on these engines are in the 400-450 hp range, so you need the extra headroom.

Does that statement only apply to the E85 or would the basic system only support around 400hp on a premium pump gas Pontiac as well?

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  #216  
Old 10-27-2015, 02:19 PM
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Does that statement only apply to the E85 or would the basic system only support around 400hp on a premium pump gas Pontiac as well?
That statement is only true about e85. e85 requires about 30% more fuel for the same power level as gasoline.

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  #217  
Old 10-28-2015, 12:38 AM
Nicks67GTO Nicks67GTO is offline
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Does that statement only apply to the E85 or would the basic system only support around 400hp on a premium pump gas Pontiac as well?
When I talked to FiTech I told them I'm looking at building a 600hp/600tq traditional 440+" pontiac. They said the 600hp system would work fine and that it's a bit underrated for this exact reason. They said 630 would be on the edge and anymore you need the 1200hp system.

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  #218  
Old 10-28-2015, 07:34 AM
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30% reduction of 630hp ~ 440hp

30% reduction of 600hp ~ 420hp

  #219  
Old 10-29-2015, 05:31 PM
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Not sure I like the cylinder to cylinder distribution of fuel. It can be running lean in one and rich in another, which sounds like potential disaster for a boosted application.

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  #220  
Old 10-29-2015, 06:21 PM
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That would be the same problem with carburation?

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