C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

CAM question

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Old Feb 25, 2017 | 03:58 PM
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any tips on making my tpi l98 run like this?


wanna put a cam in and keep the rest stock....just want the sound of the lope
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Old Feb 25, 2017 | 09:25 PM
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Needs to up the idle speed. You would also need a different intake manifold to make the loper work.
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Old Feb 25, 2017 | 09:29 PM
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Originally Posted by STL94LT1
Needs to up the idle speed. You would also need a different intake manifold to make the loper work.
Any particular cam and intake? I wanna keep the tuneport of possible, don't care about performance limitations.
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Old Feb 25, 2017 | 10:04 PM
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Is your car auto or stick? Mine is a 6-speed and i have a Lunati 10120640LK cam in it. It sounds pretty much like that. It runs good on an old ADS Superchip (in the ecm when i got it). I don't know how it would act in an auto, but it has pretty good manners in my car the way i use it. You will need the roller cam version of it and you'll want a set of valve springs to go with it.

Last edited by Benny42; Feb 25, 2017 at 10:07 PM.
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Old Feb 25, 2017 | 10:08 PM
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Originally Posted by Benny42
Is your car auto or stick? Mine is a 6-speed and i have a Lunati 10120640LK cam in it. It sounds pretty much like that. It runs good on an old ADS Superchip (in the ecm when i got it). I don't know how it would act in an auto, but it has pretty good manners in my car the way i use it.
Thanks for the info I got the 700r4 but can pick up a six speed car for cheap that has an engine knock if that would be the better car
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Old Feb 25, 2017 | 10:15 PM
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A good tuner can burn a chip that will run it fine in an auto car. This is just my opinion, too much cam in a stick car is not so bad but too much cam in an auto can make the car very temperamental.
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Old Feb 25, 2017 | 10:16 PM
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Originally Posted by Benny42
Is your car auto or stick? Mine is a 6-speed and i have a Lunati 10120640LK cam in it. It sounds pretty much like that. It runs good on an old ADS Superchip (in the ecm when i got it). I don't know how it would act in an auto, but it has pretty good manners in my car the way i use it. You will need the roller cam version of it and you'll want a set of valve springs to go with it.
Not sure the roller cam version will work in the L98 without a conversion kit. Definitely a bigger investment if so.
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Old Feb 25, 2017 | 10:20 PM
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Originally Posted by Silver85
Not sure the roller cam version will work in the L98 without a conversion kit. Definitely a bigger investment if so.
L98s went to roller cams in '87. They sure do cost more too.
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Old Feb 25, 2017 | 10:21 PM
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Originally Posted by Silver85
Not sure the roller cam version will work in the L98 without a conversion kit. Definitely a bigger investment if so.
What kit do you have in mind?
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Old Feb 25, 2017 | 10:23 PM
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Originally Posted by Benny42
Is your car auto or stick? Mine is a 6-speed and i have a Lunati 10120640LK cam in it. It sounds pretty much like that. It runs good on an old ADS Superchip (in the ecm when i got it). I don't know how it would act in an auto, but it has pretty good manners in my car the way i use it. You will need the roller cam version of it and you'll want a set of valve springs to go with it.
Wonder if your chip was a custom one off or a mass produced version? I see some nos ads tpi chips on eBay for like 75 dollars
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Old Feb 25, 2017 | 10:28 PM
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Originally Posted by midlifecrisis1979
What kit do you have in mind?
Going from flat tappet to roller rocker will require additional mods such as replacing the pushrods. I am not the person to offer advice on that one but I wanted to point it out before you placed an order for a new cam. I might stick with a flat tappet if it were me but I would wait for someone with real knowledge to chime in first.
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Old Feb 25, 2017 | 10:29 PM
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Originally Posted by Benny42
Is your car auto or stick? Mine is a 6-speed and i have a Lunati 10120640LK cam in it. It sounds pretty much like that. It runs good on an old ADS Superchip (in the ecm when i got it). I don't know how it would act in an auto, but it has pretty good manners in my car the way i use it. You will need the roller cam version of it and you'll want a set of valve springs to go with it.

Like this?
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Old Feb 25, 2017 | 10:30 PM
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Originally Posted by Benny42
L98s went to roller cams in '87. They sure do cost more too.
My bad! Good catch.....
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Old Feb 25, 2017 | 10:38 PM
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I looks like a mass produced version, its got a date code of 1987. Original owner likely stuck it in there when the car was new. Its nothing special and i wouldn't seek out & buy one. I would put the cam in and see how it runs (i found the ADS after i did the cam) then get a tune if you need it. Living with cammed car is a subjective thing, my idea of "it runs fine" may not line up with your taste. A tuner can do things no off the shelf chip can do.
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Old Feb 25, 2017 | 10:39 PM
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That '90-'91 chip is wrong for your car. Will not work
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Old Feb 25, 2017 | 10:44 PM
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Originally Posted by Benny42
I looks like a mass produced version, its got a date code of 1987. Original owner likely stuck it in there when the car was new. Its nothing special and i wouldn't seek out & buy one. I would put the cam in and see how it runs (i found the ADS after i did the cam) then get a tune if you need it. Living with cammed car is a subjective thing, my idea of "it runs fine" may not line up with your taste. A tuner can do things no off the shelf chip can do.
Cool I will give it a go, that makes sense to try it out first. It looks like there's tons of nos old parts for tpi out there.
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Old Feb 25, 2017 | 10:46 PM
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Originally Posted by Benny42
That '90-'91 chip is wrong for your car. Will not work
Gotcha, I bet if I dig for a while I can find a nos 87 chip, but the first thing I will do is run the motor on the stock ecm and see what it does
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