Injector decision

[blacknight80]

Hey Guys,

I have a stock motor and my injectors are leaky so I am in the market for a new set. Im at the point where I am looking at swapping my 86-87 ecm into it so I thought that I would start acquiring parts to get it swapped over. It will have a 86-87 ecm, Maf t and LS Maf and no cat. I would like to think I will uprgrade the turbo one day so I don't want to buy another set in a couple years so the question is what do 50-60# do to driveability until I maybe one day do the upgrades?

Thanks,

 

[Jerryl]

Many will advice to go straight to 80s, especially if you plan to run e85 some day. Here is my take. . . .

The most favorable injector size is the one that operates at or close to the industry std of 80% DC WOT regardless of the fuel and hp target. This can be calculated, but be realistic.

So . . . lets say the 80s are running at 50% DC. That means that all the fuel is injected at 50% of the available intake open time. When we do that, the fuel is "dumped" and fuel drop out becomes a much bigger issue.

When injector size is increased, fuel system will also need to be evaluated. Pump, volume, bypass, etc. need to be evaluated. So . . Goal/ budget/etc all play a role.

Fwiw . . .
A 50lb injector on gas at 3 bar base and 80% DC is capable of 425 crank hp.

Hope this helps and good luck.

 

[blacknight80]

Great info just what I was looking for.

 

[Rob_85Ttype]

In the event you are looking for some 50s:

http://www.turbobuick.com/threads/delphi-50-lb-injectors-never-used.439923/#post-3668523

 

[blacknight80]

In the event you are looking for some 50s:

http://www.turbobuick.com/threads/delphi-50-lb-injectors-never-used.439923/#post-3668523

Thanks for sending the link to your injectors. Spending has been curbed as of this afternoon for a few weeks to see how work goes been hearing rumors of more layoffs at my work. These low oil prices are getting real old.

 

[Rob_85Ttype]

I hope things improve for the US industry.

 

[Wahoo]

If e85 is available near you, i would go 80s and switch to e85. Im running a dw300 pump

 

[blacknight80]

We dont have e85 in Alberta . Our refineries are forced to blend up to 10 percent ethanol and that's it. Best fuel we get is 94 octane but 91 is more common.

 

[dank GN]

Buy them once and go 80s

 

[blacknight80]

I'm not sure I would ever do enough to this thing to require 80s. Might be over kill???

 

[Boost231]

I'm not sure I would ever do enough to this thing to require 80s. Might be over kill???

Nope

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[bison]

Fwiw the 80's don't flow 80 unless the base pressure is higher than the typically reported 3 bar. I've noticed some swing in rich/lean at short pulse widths with these when the coils get hot.


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