90 L98 Tuning
Thread Starter
Advanced
Joined: May 2024
Posts: 94
Likes: 8
From: Richmond, TX
90 L98 Tuning
I've been digging and digging and it seems I'm finding all the old stuff. I'm looking for a good reliable way to tune my L98 computer IF I do some mods like a cam, or (gasp) go crazy a do a 383. I've been calling around the Houston area and have been told 3 times now that all the "tuners' that can work on the L98 OBD1 computer are either out of business or.... dead. I don't want to start ripping things apart if I am not totally sure I can tune correctly. I KNOW people can do it, but I"m starting from scratch. I have an old setup that cam with the car but it just will not connect to my laptop despite the advice and help I've received.
I found a reference to a "C4 scan and tune" page, but I can't find that anywhere which suggests it's also pretty old. So... the question.
Is there anything current on this topic? Intake work? Tuning work? I know I can send the computer off to someone but I've heard that can be hit or miss also.
Thanks in advance. If I'm being redundant, I'm just trying to measure 3x, only cut once.
I found a reference to a "C4 scan and tune" page, but I can't find that anywhere which suggests it's also pretty old. So... the question.
Is there anything current on this topic? Intake work? Tuning work? I know I can send the computer off to someone but I've heard that can be hit or miss also.
Thanks in advance. If I'm being redundant, I'm just trying to measure 3x, only cut once.
Instructor
Joined: Dec 2024
Posts: 216
Likes: 85
From: Phoenix, Arizona
I've seen these guys recommended quite a bit - https://www.pcmofnc.com/
C4 Order - https://www.pcmofnc.com/product/1986...rder-tuning-3/
C4 Order - https://www.pcmofnc.com/product/1986...rder-tuning-3/
Racer
Joined: Feb 2024
Posts: 269
Likes: 113
From: New York
Yes. A "mail order tune" from PCMofNC is a good place to start.
You have a speed density L98 in your 90 TPI. There's tons of aftermarket tuning support for that ECM. If you want to start tuning, download the free version of TunerProRT along with the $8D xdf and ads files.
Buy the $80 data stream cable from moates:
https://shop.moates.net/products/aldu1-and-cabl1
And the $85 chip burner:
https://shop.moates.net/products/burn2-chip-programmer
That stuff and a PC laptop will get you on your way to tuning your own engine.
You have a speed density L98 in your 90 TPI. There's tons of aftermarket tuning support for that ECM. If you want to start tuning, download the free version of TunerProRT along with the $8D xdf and ads files.
Buy the $80 data stream cable from moates:
https://shop.moates.net/products/aldu1-and-cabl1
And the $85 chip burner:
https://shop.moates.net/products/burn2-chip-programmer
That stuff and a PC laptop will get you on your way to tuning your own engine.
Drifting
Joined: Feb 2016
Posts: 1,384
Likes: 339
From: Simi Valley CA
https://www.lt1pcmtuning.com
This site has great info if you want to do it yourself or you can send your chip into him for a fee. Something like $150 but may have gone up. It applies to the L98s even though it says LT1 in the url.
I followed the info on this site to do my 92. I got a laptop and bought the cords it suggested. I downloaded tunerpro and was able to datalog and save the file. I was able to diagnose a problem I had with my car. I never did finish tuning mine. You need to desolder your stock chip from the holder. I got impatient and ruined mine. I found a replacement and haven’t tried again.
This site has great info if you want to do it yourself or you can send your chip into him for a fee. Something like $150 but may have gone up. It applies to the L98s even though it says LT1 in the url.
I followed the info on this site to do my 92. I got a laptop and bought the cords it suggested. I downloaded tunerpro and was able to datalog and save the file. I was able to diagnose a problem I had with my car. I never did finish tuning mine. You need to desolder your stock chip from the holder. I got impatient and ruined mine. I found a replacement and haven’t tried again.
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Pro
Joined: Aug 2020
Posts: 647
Likes: 126
From: Liliha Bakery stuffing my face with coco puffs!
Yes. A "mail order tune" from PCMofNC is a good place to start.
You have a speed density L98 in your 90 TPI. There's tons of aftermarket tuning support for that ECM. If you want to start tuning, download the free version of TunerProRT along with the $8D xdf and ads files.
Buy the $80 data stream cable from moates:
https://shop.moates.net/products/aldu1-and-cabl1
And the $85 chip burner:
https://shop.moates.net/products/burn2-chip-programmer
That stuff and a PC laptop will get you on your way to tuning your own engine.
You have a speed density L98 in your 90 TPI. There's tons of aftermarket tuning support for that ECM. If you want to start tuning, download the free version of TunerProRT along with the $8D xdf and ads files.
Buy the $80 data stream cable from moates:
https://shop.moates.net/products/aldu1-and-cabl1
And the $85 chip burner:
https://shop.moates.net/products/burn2-chip-programmer
That stuff and a PC laptop will get you on your way to tuning your own engine.
…you can choose to molest your 1and only oem memcal unless you have spares.
