Here is my situation,89 GTA with a 231 Buick V6 .020 over,fully ported TTA heads,214 roller cam,TE64-1 turbo,CAS V-2 TTA front mount intercooler,83# injectors,65mm throtle body and plenum,and stock headers with a 3" downpipe.

Here is my problem,I have a DFI box with the jumper harness to adapt to the stock harness and I have no idea how to hook this up.What do I need to do to hook this up,how to hook up the map sensor,ect.And does anyone have a diagram or something to help me out.

I went with the DFI over the stock ECM(modded for injectors)because of the hopes for better drivability and the ability to tune for future upgrades like the 70 series r-trim turbo I'm probrobly gonna need to reach my goals.

Thanks in advance,
Steve

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TTA Fleet
Pics and info on My Cars
TTA850@TurboBuicks.com

[This message has been edited by TTA850 (edited April 01, 2001).]

 

TTA850: Contact the maker of your jumper harness for exact specs. Fast Track Performance and Dan White Racing jumpers are most popular. www.whiteracing.com The install should be very simple. Hardest part is usually finding room under the cramped TTA dash for the other ECM! On my car, I mounted my 3-bar MAP sensor above the distributor, and had plenty of reach with the harness connector. On your car, you may be able to just replace your factory MAP in the stock location. One tip: With 83# low-impedance injectors, it would be wise to invest in the Variable Injector Controller. This will keep your factory injector driver cool, and help with the Buick V6 intake fuel distribution troubles. Good luck!

[This message has been edited by GMI FAST (edited April 01, 2001).]

 

If you're the type that has more time than money, you could also repin your harness. I did that on my 89 IROC when I swapped from the GM MAF ECM to the DFI. You just need to figure out what wires go into which DFI pins, and then its just an hour of your time. I ran new wires for the MAP sensor and the heated wire O2. I have an Excel spreadsheet for the GM/DFI pinouts somewhere off the Z28tt page at http://www.skulte.com/turbo.html . I hope this helps!

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Andris Skulte
Skulte Performance Designs
Z28tt-89 IROC T56 DFI Twin Turbo
http://www.skulte.com

 

Thanks guys,what I actually have is the DFI with an ANS adapter to hook the unit up to the stock harness so thats not really the problem.What I need to know is what other modifications are needed under the hood to make a DFI work?Such as what wires do I need to tap/splice into to hook up the MAP sensor?Also,are the pinouts for the 8cyl DFI the same as the 6cyl DFI?As far as I know the only differance is the amount of injector drivers.If the pinouts are the same I can just run new wires for the MAP sensor and thats all I need to do right?

Thanks again,
Steve

 

Steve,
Let me get this straight. Your DFI with the ANS adapter harness plugs right in, but you still need to wire up the missing inputs, correct? What was the original engine/harness? I'm guessing it was the V6 TTA. You need to wire in the inputs you don't have. I'm not familiar with the V6 wiring harness, but I'd assume the TTA already had a MAP sensor, in which case the harness took care of it. It should be listed in the service manual. You could check with the folks over at the Buick page too. They know their stuff, and plenty have swapped over to DFI.

Andris
89 IROC T56 DFI Twin Turbo, with a broken DFI box...

 

Thats right,the ANS adapter allows me to plug into the stock TTA harness and while a TTA does have a MAP sensor it is used only for the boost guage and does not go to the ECM in any way.I think the best way to do this is to tap a 5v referance signal from the ECM(TPS,ect..)and a ground to run to the MAP sensor and take the signal from the MAP and tap it into the MAF input wire going to the ECM.

What do you think,sound about right?

Steve

 

I cant believe the people you got the adapter from are not able to tell you what to do. You will have to find out what wire the dfi uses as the signal wire from the map and run a 5v signal as you stated. It probably would have been cheaper and easier to gut the stock harness and just use the dfi one. But im being negative, so ill shut up now.

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87z 383,afr 190's, comp hyd roller(242/248-.540/.562,114 sep),Ported and polished mini ram, 30lb inj, 3.42 gears, tremec 5spd, , 1,3/4" slp headers, speed pro bank to bank-wb02.
"Just remember children, no man can beat you once youv'e found the cliterous." 'chef'

 

i have a jumper board from ASSC and it plugs and plays. i undo the factory harness from the computer plug one end of the jumper harness into the factory one and the other into the DFI computer. then i just have to plug in this other thing into the TPS, then the FACTORY TPS snaps in into the extra wiring and i splice a wire onto the power wire for the MAF and use that for the power for the MAP.

hey, andris...i know someone who has one for sale if you want it

 

Well me trying to save money every chance I get I picked it up used and didn't get install instructions.The guy I got it from had it profesionally installed and dosent know either.But I think I got it figured out now,and he's sending me over the calmap as we speak so we'll see how it works out.

Thanks again,
Steve

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TTA Fleet
TTA850@aol.com

[This message has been edited by TTA850 (edited April 04, 2001).]

 

89 - Thanks for the offer. Have him send me an email (spd@skulte.com) in case I don't get the DFI box fixed. I've actually got the dang box almost reverse engineered! (up till 2 last night reading an electronics textbook, and drawing the circuits) It's a very simple setup, and I think I'll be able to find the bad component. I love learning new things.

TTA850 - MapA = PinD3 (on DFI)
MapB=C3
MapC=D6

Rather than powering the MAP from the MAF circuit, you might want to wire it from the DFI box as it was intended. This avoids having different ground levels (incase the MAF power lead (which goes together with the fuel pump relay power, burnoff relay, etc...) has a slightly different voltage than the DFI. The power voltage shouldn't affect readings, but if you can wire it directly, it eliminates one more variable to chase down.



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Andris Skulte
Skulte Performance Designs
Z28tt-89 IROC T56 DFI Twin Turbo
http://www.skulte.com

 

well, that is how i'm assuming it hooks up. i'm not too sure. But larry at ASSC did a lot of these jumper boards and never has a problem with them