Detonation questions

[BigReade]

Looking for some feedback here. I just picked up an '87 T that's been sitting for some years, so first thing I did was give it a good tune up and going through. I went with the NGK UR5 plugs, and closed the gap to .030. Taylor 10.4mm plug wires. Changed the fuel filter, did an oil change, chased down a couple vacuum leaks and fixed a fuel injector wire that was bad. The car is bone stock, no aftermarket goods on her yet.

Today I took it out for the first time, and from idle to 4k rpm the car runs great. As soon as it gets above 4k, it starts breaking up horribly. I'm new to the turbo Buick world, and was goping to hear some words of wisdom from some of you seasoned guys. I have the maf translator and am picking up a new maf tomorrow, in hopes that it could be an air fuel issue. While I do have a fuel pressure gauge, it's on the fuel rail, so I need to mount one up on the cowl so I can see what it's doing as I'm driving, but for now, at idle, it's pushing about 30psi, and when I pull the vacuum line, it jumps up to about 39.5.

I know it's tough to diagnose from just reading a paragraph, but I figured it was worth asking. I am dying here, wanting to enjoy this car, lol

 

[Bescurred]

This could be a # of things if the car is as truly stock as you say.

You need chip/ HotWired fuel pump/ fuel pump/ new bigger (not much) injectors, scan master, replaced timing chain, and updated maf like you said you're getting. That's just a start...but for now I'm guessing the maf is the problem. I wouldn't start getting into the boost till you at least have those items and the tune of the car based out.

 

[87geeinn]

Assuming it truly is bone stock, there are still a lot of things to be ironed out before you get to enjoy the car. First off, you should get a new chip and matching injectors from turbotweak.com; put a new fuel pump in, "hotwire" it, and add an adjustable fuel pressure regulator. You could also have a bum ignition module/coil pack. Continue reading and researching. You have lots of work ahead of you but it will be rewarding as you start learning and bringing the beast back to life. Some advice: 1) Lower the boost waaaaay down until you get everything working properly. 2) Patience is a virtue when dealing with these cars.

 

[BigReade]

I'm waiting on the Scanmaster as we speak, I ordered it almost 2 weeks ago, but the snow storm back east had Kirban's down for a while. Should be here Tuesday. Was thinking about doing the 60# injectors, and the Walbro 340 pump setup along with the hotwire kit. Didn't consider the timing chain, but will now! I bought the car from the original owner, and it came with all the service records, so I'll go back through them and see if there's any record of it being done. I think the most recent record I have for it was from 2002, where they had the top end rebuilt. While it was 12 years ago, the car has only had 2k miles put in it since then.

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[BigReade]

I was definitely going to turbotweak for the chip as well, just figured it to be best to get everything else done first, so I could give him an exact list if what's in the car. What are your recommendations as far as injectors go? Am I going too big if I go with the 60's?

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[BigReade]

And thank you for the advice!

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[87geeinn]

60's are just fine and give plenty of room to grow. They are not too big. That's what I have on mine and have been running them for years, even when I had only a few bolt-ons. If your wallet allows, get a Powerlogger too. Most of what you'll need can be had from TurboTweak. Depending on the mileage of the car, I wouldn't sweat the timing chain right now. If you find in your research that you're running a flat tappet cam, might want to consider a zinc additive in your oil. Lot's of info on that if you do a search.

 

[BigReade]

I did go with the Brad Penn 20w50 oil and Wix filter. Power logger is definitely on the "hurry up and buy" list. I'm picking up an ls1 maf tomorrow, and correct me if I'm wrong, but I'm going to have to modify the mount location due to the increased size, no? So I was going to wait to install until I got a cai (one that will accept the ls1 maf)

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[BigReade]

I also have a brand new Walbro 450 fuel pump here. Any opinions on that? Should I use it or go another route?

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[TurboBuRick]

You mean a 255 pump?

A after market maf pipe and a reducer coupling will be needed to install the ls1 maf. You will also need a air filter. The mount for the old maf will not be used.

 

[BigReade]

No, its a Walbro 450. I was going to run 2 of them in my turbo truck for E85. But the truck is sold, so whatever parts I can scavenger, I have

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[BigReade]

https://www.extremepsi.com/store/product.php?productid=24456

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