I went to the track Friday for the PRI race and for the heck of it I ran the BURB. First pass I babied it off the line and didn't go full throttle and ran a 9.11 in the 1/8th(I know not real fast, but respecteable for a 7000 pound family bus running a street tune), but on the subsequent passes I slowed down as it fell over in 4th because I wasn't getting lockup. I never had problems with not geting lockup with TRANSYND, but since switching to a DEX/MERC type fluid I no longer get lockup at WOT. I know a lockup box will take care of this problem, but the problem is I don't have the money for one, and my slippage everytime I check it is under the 600 RPM slip limit that many says is the limit in the TCM but still no lockup.
Since this problem started when I switched to the DEX/MERC fluid, I pulled up some spec sheets on different fluids and found some interesting info. What I found was that the CASTROL DEX/MERC fluid has a viscosity of 32 @40C and 7.2 @100C, QUATRASYN has a viscosity of 36.5 @40C and 7.25 @100C(very close to that of DEX/MERC fluid, and AMSOIL TORQUE DRIVE), but TRANSYND has ratings of 53.9 @40C and 9.75 @100C. I switched to DEX/MERC fluid and stayed with it as it gives a MUCH better shift feel to it VS the TRANSYND(much more positive shifts), but it has made my converter feel looser up top under power.
What I'm wondering is if there is anything to the viscosity difference and the lack of lockup many experience under bigger power? And if so, what fluid would be a good compromise between the major fluids out there? Or is there maybe some additive out there you could go to to maybe help raise the viscosity some to that of TRANSYND, but maintain the shift feel of DEX/MERC fluid?
http://www.castrol.com/liveassets/b...local_assets/downloads/p,q/pds_DomesticMV.pdf
http://www.docs.citgo.com/msds_pi/10148.pdf
http://www.castrol.com/liveassets/b...AGING/local_assets/downloads/t/TranSyndRD.pdf
Since this problem started when I switched to the DEX/MERC fluid, I pulled up some spec sheets on different fluids and found some interesting info. What I found was that the CASTROL DEX/MERC fluid has a viscosity of 32 @40C and 7.2 @100C, QUATRASYN has a viscosity of 36.5 @40C and 7.25 @100C(very close to that of DEX/MERC fluid, and AMSOIL TORQUE DRIVE), but TRANSYND has ratings of 53.9 @40C and 9.75 @100C. I switched to DEX/MERC fluid and stayed with it as it gives a MUCH better shift feel to it VS the TRANSYND(much more positive shifts), but it has made my converter feel looser up top under power.
What I'm wondering is if there is anything to the viscosity difference and the lack of lockup many experience under bigger power? And if so, what fluid would be a good compromise between the major fluids out there? Or is there maybe some additive out there you could go to to maybe help raise the viscosity some to that of TRANSYND, but maintain the shift feel of DEX/MERC fluid?
http://www.castrol.com/liveassets/b...local_assets/downloads/p,q/pds_DomesticMV.pdf
http://www.docs.citgo.com/msds_pi/10148.pdf
http://www.castrol.com/liveassets/b...AGING/local_assets/downloads/t/TranSyndRD.pdf