V6 Discussion and questions about the base carbureted or MPFI V6's and the rare SFI Turbo V6.

2.8l to 3.4l in 1986 firebird

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Old Nov 12, 2010 | 09:58 PM
  #51  
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Car: 1986 Firebird
Engine: 3.4L Swap is done
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Re: 2.8l to 3.4l in 1986 firebird

hey I never claimed to be able to spell........ and it was suppost to be site.....
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Old Nov 16, 2010 | 02:34 AM
  #52  
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Car: 1986 Firebird
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Re: 2.8l to 3.4l in 1986 firebird

Ok guys I was taking the chips out of the 730 memcal, and I noticed the white board ckt board (knock sensor board?) is broken. On this board I was wondering if I could still use it just with out the knock sensor feature just to get the car running to check the new ECM, or would I need this board to check the wiring/ repin

Last edited by batsibf; Nov 16, 2010 at 10:28 AM.
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Old Nov 16, 2010 | 04:41 AM
  #53  
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Re: 2.8l to 3.4l in 1986 firebird

I have no clue what board you are talking about, but in terms of the engine, an 86 shouldn't have a knock sensor(or at least I'm pretty sure) and even if it does shouldn't need it to run, but if you are trying to get a computer to run it, and the computer thinks there is one, and there isn't it might be problematic...but I have a 3.4 in my car and no knock sensor and it runs just fine. But I also have the stock ECM, which isn't setup for one.
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Old Nov 16, 2010 | 10:27 AM
  #54  
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Car: 1986 Firebird
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Re: 2.8l to 3.4l in 1986 firebird

Originally Posted by 3rd gen RS
I have no clue what board you are talking about, but in terms of the engine, an 86 shouldn't have a knock sensor(or at least I'm pretty sure) and even if it does shouldn't need it to run, but if you are trying to get a computer to run it, and the computer thinks there is one, and there isn't it might be problematic...but I have a 3.4 in my car and no knock sensor and it runs just fine. But I also have the stock ECM, which isn't setup for one.
my '86 2.8 dose not but I going to do the 165 ecm, with the 730 memcal. then when the 3.4 is ready to put in then ....... I have not decided about the knock sensor yet but I'm also not to that point. I have seen in the tuning you can turn it off.
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Old Nov 17, 2010 | 09:05 PM
  #55  
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Re: 2.8l to 3.4l in 1986 firebird

It will set a code with a broken knock board (unless you disable it in the calibration) but it will still run fine until you can replace it.
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Old Nov 17, 2010 | 09:15 PM
  #56  
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Re: 2.8l to 3.4l in 1986 firebird

Originally Posted by bl85c
It will set a code with a broken knock board (unless you disable it in the calibration) but it will still run fine until you can replace it.
He's trying to use this in a '165 though, that uses an external knock filter, so I don't think it will really cause an issue.
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Old Nov 17, 2010 | 10:09 PM
  #57  
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Re: 2.8l to 3.4l in 1986 firebird

No, he's using the swap and bins I put together. It needs the '730 memcal with knock board and it will set a code.
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Old Nov 18, 2010 | 09:42 PM
  #58  
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Car: 1986 Firebird
Engine: 3.4L Swap is done
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Axle/Gears: Stock
Re: 2.8l to 3.4l in 1986 firebird

thanks guys,

question on cams, one of the guys I work with said I put is an street cam, and I have seen people like differnt cams on here. what lift on intake and exhaust should i be looking at, since I have gotten the car I have been watching where I like to drive at and it between 2 and 3k with a max of 5k......
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Old Nov 28, 2010 | 01:05 AM
  #59  
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Car: 86 Firebird SE
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Re: 2.8l to 3.4l in 1986 firebird

Putting a hot cam into an engine without matching heads and intake will not do anything but possibly make it a dog off the line. The flow has to match the lift and duration of the camshaft or all that work is for nothing. And if you are doing the 165 swap described in bl85's thread, you have to use a 7730 memcal and the white knock board has to be functional. Look in Corsicas, Berettas, 89 and up camaros and firebirds for the 7730. Get another memcal that has a good knock board. I trust that you installed the knock sensor like described in the thread?
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Old Nov 28, 2010 | 01:22 PM
  #60  
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Car: 1986 Firebird
Engine: 3.4L Swap is done
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Axle/Gears: Stock
Re: 2.8l to 3.4l in 1986 firebird

I have two memcals one has the board the other the board was damaged when I got it

So if I understand you right just doing the port and polish would be fine with the stock cam but putting in a hotter cam wont do anything but give it a torque boost in the lower ranges?
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Old Nov 28, 2010 | 02:54 PM
  #61  
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Re: 2.8l to 3.4l in 1986 firebird

What he's saying is you need to look for a cam tailored to what you intend to do with it and how your motor's built. You can put a cam that works well at higher rpm in a torqey motor with long runners and a small throttle and it will be a complete turd everywhere. You can put a cam that works well lower in the powerband in a high flowing motor with short runners and a large throttle and it will still cholke up top and lose out on torq down low. Using a well matched cam will give you the best of everything.
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Old Nov 28, 2010 | 05:23 PM
  #62  
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Re: 2.8l to 3.4l in 1986 firebird



Thats exactly what I meant. I have seen quite a few cars that people have put in these really high lift cams in stock engines and the cars fall flat on their faces when you romp them and they can't figure out why. If you are going to do mostly daily driving and some strip trips, then a mild street cam should be the ticket. If you are going to use ported heads and intake then you can go slightly higher but make sure the lift and duration matches the cfm of your heads and intake. You should be able to find flow rates for stock heads and intakes if you do a search. When you get heads and intakes ported, you should be given a paper that has the results of a flow test, unless it is somebody doing it on the side. With that sheet, you can pick the right cam for your needs. Its alot of planning not just slapping a lumpy cam in there to try and sound cool. Take your time and PLAN things out and you will have a car that puts a smile on your face when you smash the go pedal.
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Old Nov 28, 2010 | 09:19 PM
  #63  
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Car: 1986 Firebird
Engine: 3.4L Swap is done
Transmission: Auto
Axle/Gears: Stock
Re: 2.8l to 3.4l in 1986 firebird

ok cool, thats why I'm putting it up now and getting everything together to do this right (as much as I can anyway). I'm building her to be a cruiser, so off the line is not that important to me, but who dose not like spining wheels ever once in while.
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Old Jan 1, 2011 | 11:28 AM
  #64  
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Car: 1986 Firebird
Engine: 3.4L Swap is done
Transmission: Auto
Axle/Gears: Stock
Re: 2.8l to 3.4l in 1986 firebird

hey all,
thanks for all the info just keeping this were I can find it
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