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Texas GN
Jack, just bought a 1987 25k GN that has been in a warehouse for many years here in San Antonio Tx. The car has had a few mods on it but i think for the most part it is stock. The mods are dual exhaust 2.25 ,headers, gauges (boost,temp,oil pressure,temp) hypertech chip (PT# 41 373). Can't seam to find any info on a 41 373 but there is plenty of info on the 41 372. I changed the gas tank out because it was full of rust and changed the fuel pump to a Walbro 255lph.
Oh, one other thing I have a hot wire kit for it too. I noticed it is running lean, the plugs were very clean; to clean even after 500 miles. Anyways I would like to get the car into the hi 12s low 13s. I need you to put me on the right track, you said something about 42lb injectors and a chip? Can i use the chip i have? Are the Valve springs up to the tasks? I hear they were weak too. Thank again, Glen |
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Sounds like A BEAUTY.. I didnt see anything about the fuel filter being changed out. You should definatly do it If you havent already.
You will need a chip for the #42 inj Im sure Jack has some in stock Good luck Mike Post up some pics !
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If It Doesnt have a motor Its Not a sport, Its Just a game...
SOME PEOPLE SHOULD NOT OWN TOOLS |
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Texas GN
Thanks, I was planning on ordering the injectors asap but what about the Hypertech chip? Should I scrap the one that's in there now? Or should I try it with your 42 lb injectors?
Thanks Glen |
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Hi Glen,
Your going to need a new chip for larger injectors. Chips have come a looong way since that hypertech chip. It was most likely intended for use with stock injectors. Chips now a days are burnt specificly for the injectors. Should you go to a larger injector after the #42s say maybe #50s same rule will apply Hope this helps
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If It Doesnt have a motor Its Not a sport, Its Just a game...
SOME PEOPLE SHOULD NOT OWN TOOLS |
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Yup, Mikey is right.
First thing is work on the fuel system, which you have already started. I agree with Mikey, replace the fuel filter if you haven't. Does it have an adjustable fuel pressure regulator? All chips burned for this car require that the fuel pressure be set a bit higher than the factory non-adjustable unit is set for. Factory is 30#, I think, and most chips want you to set it for 42-ish. Make sure everything is running right, FIRST. Then injectors and a chip. And as said, chips are programmed based on injector size. After that, if you want more go, then turbo, and/or a higher stall converter. Oh, don't forget, you are going to need to put tires in your budget.
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Brian Keep it shiny side up, but show them your dirty side once in a while. 11.3@123mph on 195/75/14" whitewalls. Yes, 195s! 11.2 on the big giant slicks. What's the point? Maybe I'll go back to the whitewalls. They are lighter and have less rolling resistance. |
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Here's my car! 1987 Buick Grand National, 25k miles, just needs a little kick!
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