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Old 12-06-2018, 03:43 PM   #1
autowiz
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Check Out This 1993

So this came into the job today..





40th anniversary edition with the window sticker still in the car but that's not all..



That's right. The original ZR1..







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Old 12-06-2018, 09:41 PM   #2
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That might be the prettiest engine on the planet. I've always loved the LT5. They made a lot of horsepower for the day. Back then people didn't know how to get horsepower and emissions. The Corvette L98 was good at 245 horsepower from 350 cubic inches but here came the LT5 with 375. The LT5 Vette ran on a track and averaged 175 MPH for 24 straight hours. That would be impressive even today.

Later versions made 405 horsepower and a simple change of the cams was getting over 500 HP........in 1990 from 350 cubic inches. Lotus knows a thing or two about DOHC heads.
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Old 12-07-2018, 01:48 AM   #3
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Wow, amazing!
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Old 12-13-2018, 06:12 PM   #4
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Oh how we have gone down the drain over the years. There can be no arguing. Recently I had a rental car, and I am proud to say it was a rental and not on something I owned or paid my hard earned money for. But I rented a sleek sexy import with this..



Such a long way have we come over the decades. LOL. Corvette ZR-1 back in 1993 had a switch to control the engines output. But it read a little differently..





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Old 01-04-2019, 04:59 PM   #5
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So this car is in for a no start condition. The window sticker still being in the windshield really tells a tale of no miles and extremely long times spent sitting. The fuel tank was serviced and the fuel pump changed before the car came to us. My diagnostic process has led me to bad fuel injectors. We have good fuel pressure at the rail. And we have injector pulse at the injector pigtails, but when I charge the fuel rail and energize an injector I don't see any pressure change at the rail indicating the injectors are unresponsive. So the plenum needs to come up..



And we can access the fuel rail and injectors. Here are those parts removed and ready to be stripped down..





This right here is the reason that all Corvettes are so awesome..



And here is that fuel rail all broken down and ready for rebuilding..

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Old 01-04-2019, 08:48 PM   #6
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I love the way the C4 hood opens and exposes the wheels.

Not a big fan of the wrap around rubber baby buggy bumper.

Regardless that's one nice Vette

When I got out of the Army that was the car I dreamed of getting but life and me being stupid got in the way.
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Smithers, unleash the hounds!
Edelbrock E-Force 1593 & Magnaflow exhaust for that healthy American sound. Before SC 354 RWHP, after SC 484 RWHP. That's all I can do and still pass California smog.
Old 01-04-2019, 09:55 PM   #7
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Woa. Look at this. Specific plenum gaskets for an old LT5..



I remember making a set of those before. but we found an injector supplier that offered these gaskets. So that is who we went with. The new injectors have a new design nozzle and spray pattern..



All O-rings need to be changed in this assembly..



Going back together we can see that this whole ZR1 fuel rail rebuild went down live on DC..





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Old 01-04-2019, 10:00 PM   #8
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I just want to point out the P.I.T.A. about the LT5 plenum. There are electronics and many connectors that plug to the underside of the plenum. One that is bolted in from the rear..

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Old 01-05-2019, 03:58 AM   #9
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Love the write-up! Thanks for sharing this.
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Old 01-05-2019, 08:54 AM   #10
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Awesome car and story! Thanks for sharing with us.
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Old 01-05-2019, 10:46 AM   #11
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After replacing the injectors and getting the intake back together I made this video of the what I thought was going to be the car coming to life..


Aside from the fuel system being failed, so were the 2 map sensors in the vehicle. There is one on the back of the intake manifold that is easily accessible and readily available. This is the map sensor for the engine like all others and this fixed my starting and stalling issue and now the car runs. The other map sensor is bolted to the underside of the plenum and this sensor is for the secondary port vacuum system. This map sensor does not exist today and has been a pain to find. We did finally source a nos part. And it is in and all is happy.
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