Tune override

[robvas]

My procharged 15 with a 27" tire would slam into the whatever the procharger's tune rev limit was set at (7300?) just before the end of the 1/4 at 119 mph in 4th gear. When I short shifted into 5th I lost time but got it up to 124 trap speed. I swapped to 3.55 and could reach the end of the 1/4 in 4th at 125 with no other changes. I also gained about 1 mpg and it was a little easier to drive in the city

Why not just go a 28" tire? Should have gave you about 4mph.

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[Mattwood440]

Nothing needs changed in the pcm unless you are above 3.73 or below 3.15

Thank you!!! I want to give businesses the benefit of the doubt but Livernois did me wrong twice

 

[junits15]

Thread hijack incoming. On a 15 PP MT82, when I changed from 3.73 to 3.55 should I have needed to change something in the ECU/PCM? I didn't and it ran fine but I'm wondering if it could have run better. The speedo was dead on after the swap without any programming. Livernois (who I lived 5 miles from at the time) swore I needed their $1000 tune and quoted me over $2100 to change the gears. Someone else said that was bull so I did the gear change myself. I keep getting conflicting information. Thanks!

The ECU and BCM can adjust for 3.55 on their own. Its only when you go above 3.77.

 

[Mattwood440]

Why not just go a 28" tire? Should have gave you about 4mph.

I did. That was 7 year ago. After the opg, crank sprocket, ATI balancer I had the cutoff set to 7600. With some other mods I cracked 130 in 4th, and finally got into the 10s at Milan Dragway with an embarrassing 60' . After the A10 came out I basically gave up chasing and admitted I'm not a good drag racer but still like shifting my own. So I hung up the helmet and just do hooligan things on the street now. Same car, now at 680rwhp on 93, still DD, just having fun replacing rear tires every 5-10k

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