Performance Upgrade Path for a 1999 S80 T6
Short answer: there isn’t one. Long answer: there is, if you’re willing to spend lots of money to get there, and find a way around an inherently weak transmission. S80 performance isn’t easy.
To be blunt, it’s best to get another Volvo to add performance to. The S80 has few aftermarket performance products made for it.
bigdaddylee82 » T6 S80 is really peppy in stock form, especially compared to most of the other offerings from Volvo over the years. My parents have one, I test drove, purchased, delivered it for them, and have driven it a few times since while visiting them. I’ll echo what JRL said; be happy with your tune up, and say a little prayer for your transmission every time you put it into drive.
Volvo used a version of the GM 4T65-E trans in the S80 T6, the 4T65-E is the same transmission in the late ’90s early ’00s Pontiac Grand Prix, Chevy Lumina, Monte carol, Buick Aurora, etc. I had a ’94 3.1L Grand Prix, with the older 4T60-E and it was as reliable as a hammer, I put dang near 300K miles on it’s transmission, but went through 2 engines. I don’t know what Volvo did to the trans, or if it simply can’t handle the T6’s power, the failure rate has puzzled me ever since I started researching my parent’s S80.
On a side note, in today’s edition of: Random Thoughts by Lee, There’s a 4T65E-HD that’s a common swap into a lot of the previous mentioned GM cars, that have been “built/upgraded/tuned.” The 4T65E-HD is a “heavy duty” version of the 4T65-E that came stock attached to the Super Charged 3.8L (L67) in the Grand Prix GTP, Bonneville, Buick Riviera, SS Impala, SS Monte Carlo, etc. That L67 can make some insane torque and HP numbers, and the 4T65E-HD handles it. I’ve often wondered what it would take to get the 4T65E-HD swapped in place of the Volvo/GM 4T60E. Maybe swap the Volvo/GM 4T60E’s guts for the 4T65E-HD’s guts… I don’t know what the Swedes did to the trans when they got their hands on it, so any ease/difficulty to such a procedure would be pure speculation on my part. I believe just about everything but the cup holders are computer controlled on these things though.
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