Holley EFI on 98 Trans Am
Holley EFI on 98 Trans Am Anyone have tips on installing aftermarket EFI on a 98 Trans Am? what all do I need to tie into? Id like the factory gauges to work, ABS, etc. I'm guessing I can tie into the OEM with an RPM signal for tach, add temp sensor to the right rear head for coolant temp, Fuel gauge will still work. Will the ABS still work or does it need something? what about speedo? can you tap into the VSS? I read the 98 was still analog gauges so I think that will be easier. thanks for any help
Have you finished this plug and play harness? Very interested in this! What applications are you working on?
This is a good thread from a couple of years ago that I saved that specifically talks about 1998 f-bodies https://ls1tech.com/forums/pcm-diagn...dominator.html
TECH Apprentice
Joined: Apr 2016
Posts: 313
Likes: 16
From: Lincoln, NE
Your with Detroit Speed, that DSE-Z is an absolute animal love it!! That build has really made me second guess my 01 Z as I've always had a soft spot for nice 3rd gens, killer build you guys!!
We prefer for a much cleaner install stall and remove the 20 year old wiring and inaccurate cluster and use the Holley touch screen. While its not for everyone a stock cluster is in a 98 is very inaccurate, I wouldnt trust any of the readings off the stock cluster on a performance build.
You need to split the crank and cam signals so both the stock ECU and the Holley see them.
The more challenging part is figuring out what size resistor you need for the crank signal to make both ECU's happy.
You will need an oscilloscope and an adjustable pot to figure out the resistance you need.
The more challenging part is figuring out what size resistor you need for the crank signal to make both ECU's happy.
You will need an oscilloscope and an adjustable pot to figure out the resistance you need.
