So recently i decided to cheaply upgrade my turbo from the standard CT26 which has done 440,000kms. Once it was removed i noticed the wastegate port was cracked. Beside this i went ahead and fitted a new Kinugawa TD05-18g turbo with an internal wastegate which came with a 1.0Bar (14.5psi) wastegate spring.
When fitting the turbo i had to remove one of the brackets holding the steel water pipe running between the turbo and block so i could tighten up the bolts on the exhaust manifold flange. After this i went for a road test and found it only had 7 psi boost so i did some research and found this chart below:
Kinugawa Wastegate opening pressure/ preload spec.
I received the factory yellow spring so i decided i needed to preload the hell out of the yellow spring to up the boost and i went ahead and did this and found a little difference ~2psi.
Following this i decided i wanted to run 20psi to gain more highway torque for hills and passing as 14psi from the factory CT26 was all i could possibly hope for. I went ahead and brought a 'blue' spring which had 1.5 bar (21psi) written on it and should open between 0.6bar and 1.5bar (depending on preload). Once this arrived i removed the wastegate actuator and fitted the uprated spring. This time instead of road testing i performed a pressure test using a modified tyre inflator and some hose fittings to pressurize the diaphragm, results from this showed the actuator didn't open till 12.5psi was applied. I took from this that once i fitted the new spring i would preload the actuator on the vehicle by shortening the actuator travel to obtain the correct boost between 14-20psi. The result from this was 12.5psi WOT in 3rd at 2,500 rpm.
Next i thought what if i double the spring ratio so i fitted the factory 1bar spring aswell as the 1.5bar spring which was very difficult to fit and found now i only have 10psi on WOT in 3rd. what could i have possibly got wrong here?. The vehicle pulls hard down low but after 2,500rpm it has no balls and egt's are around 600c. This could be a fuel setting but i would have expected more boost.
Info on the truck:
1992 1hdt hdj81.
recond injector pump
recond injectors
custom intake incl snorkle
egt and boost guage Redarc.
auto with 440kms on the clock
3 inch exhaust
front mount intercooler
little to no blow-by
brand new Kinugawa TD05-18g with 11blade turbine, 6+6 cast impellor.
Below: Kinugawa turbo link
When fitting the turbo i had to remove one of the brackets holding the steel water pipe running between the turbo and block so i could tighten up the bolts on the exhaust manifold flange. After this i went for a road test and found it only had 7 psi boost so i did some research and found this chart below:
Kinugawa Wastegate opening pressure/ preload spec.
I received the factory yellow spring so i decided i needed to preload the hell out of the yellow spring to up the boost and i went ahead and did this and found a little difference ~2psi.
Following this i decided i wanted to run 20psi to gain more highway torque for hills and passing as 14psi from the factory CT26 was all i could possibly hope for. I went ahead and brought a 'blue' spring which had 1.5 bar (21psi) written on it and should open between 0.6bar and 1.5bar (depending on preload). Once this arrived i removed the wastegate actuator and fitted the uprated spring. This time instead of road testing i performed a pressure test using a modified tyre inflator and some hose fittings to pressurize the diaphragm, results from this showed the actuator didn't open till 12.5psi was applied. I took from this that once i fitted the new spring i would preload the actuator on the vehicle by shortening the actuator travel to obtain the correct boost between 14-20psi. The result from this was 12.5psi WOT in 3rd at 2,500 rpm.
Next i thought what if i double the spring ratio so i fitted the factory 1bar spring aswell as the 1.5bar spring which was very difficult to fit and found now i only have 10psi on WOT in 3rd. what could i have possibly got wrong here?. The vehicle pulls hard down low but after 2,500rpm it has no balls and egt's are around 600c. This could be a fuel setting but i would have expected more boost.
Info on the truck:
1992 1hdt hdj81.
recond injector pump
recond injectors
custom intake incl snorkle
egt and boost guage Redarc.
auto with 440kms on the clock
3 inch exhaust
front mount intercooler
little to no blow-by
brand new Kinugawa TD05-18g with 11blade turbine, 6+6 cast impellor.
Below: Kinugawa turbo link
Kinugawa Turbocharger 3
Description Kinugawa Toyota 1HD diesel td05h-18g spec turbocharger with 3" anti-surge cover and 7cm Bolt-on turbine housing provide ultimate spool time than the stock (8cm). The turbocharger is equipped with CT26 base turbine housing (inlet and outlet type) the same as the factory turbocharged...
store.kinugawaturbosystems.com