Gen-TT Truck Twin Turbo Kit
Aug 25, 2007 | 01:51 PM
#114
From this pic here
it will not work on a 4wd truck, the driveshaft is about 2" to left of the oil filter and the shaft is 2.5" in diameter so it will hit the charge pipe coming off the turbo. Might want to rethink the location of the passenger side charge pipe it will make changing the oil a PITA since it will drain on to the pipe.
it will not work on a 4wd truck, the driveshaft is about 2" to left of the oil filter and the shaft is 2.5" in diameter so it will hit the charge pipe coming off the turbo. Might want to rethink the location of the passenger side charge pipe it will make changing the oil a PITA since it will drain on to the pipe.
Aug 25, 2007 | 07:03 PM
#115
FormerVendor
Joined: Nov 2003
Posts: 356
Likes: 0
From: Australia
Good news - we have a different LHS pipe for the 4wd truck now. The chassis rail sits in a different spot on the 4wd, but in fact we are very close to clearing it as is. Will have some pics of the 4wd up this week. Final production aluminum pipework is slightly different to that pictured and allows for oil drain without having to undo two screws 
Aug 25, 2007 | 07:04 PM
#116
FormerVendor
Joined: Nov 2003
Posts: 356
Likes: 0
From: Australia
Hey guys heres the latest update on our Gen-TT Intercooled Twin Turbocharger GMC Truck System. Preliminary testing and tuning has begun, and the results so far are excellent, with the combination of truck and a pair of correctly size turbos producing mind blowing torque off the basement. Durability testing will include a good solid schedule over the next week of loaded haul work and some general city work before the truck is off interstate next Saturday driving from Adelaide back to the High Country
Good news is that there are zero underbonnet modifications when fitting the Gen-TT Truck kit. The airbox is removed, the inlet pipe comes off, and our new hardware screws into place. Some existing kits require different engine fans, wiring modifications etc. Everything stays factory with our setup. We figure that a competent mechanic could have this system installed and out the door in around 10 - 14 hours, as we even supply exhaust pipes to join the turbochargers to the original existing GM Truck system
http://www.youtube.com/watch?v=3EITomvZL3s
Dyno testing and tuning was a straightforward affair using HP Tuners 2 bar Speed Density operating system on the 5.3 litre iron block engine. Fuelling is supplied by a set of 50lb/hour fuel injectors fed by a Bosch 044 Motorsport fuel pump. Adding a decent pump in this application is simple as the GM Truck has a full return style fuel system. A very conservative calibration was used in this application with the fuel mixture left nice and rich and conservative ignition timing in place to allow for less than perfect quality fuel in tow/haul situations. The transmission programming needed massive alteration though as the GM truck program is very sensitive to kick down due to the engines low original torque....with the Gen-TT kit in place we have the truck holding the gears much longer at big throttle openings and using its new muscular torque curve to advantage
Power gains are impressive with a massive linear rise in the power curve from the start of the ramp right through to the end. Starting out with 250rwhp we moved the yardstick to 402rwhp using 7psi boost pressure (wastegates on minimum setting) through this cars single 2.75inch exhaust system. Its pretty restrictive, but its what the majority of these trucks run, so we left it in place. Still thats 60% more power
The big gains though were to be had in the low rpm torque - exactly where we wanted them - which makes the big truck a tyre frying weapon in second gear roll on full throttle applications. If you look at the dyno curve the Silverado gained over 70% torque at 3000rpm. Thats massive, and gives the GM truck that big powerful jet aircraft feel when you sink the hammer down. Should run a very very easy mid 12
Later this week we will remove the single exhaust, wind the boost up to 12psi and go for that 500rwhp number, which we believe is very easily attainable on a stock 5.3
Good news is that there are zero underbonnet modifications when fitting the Gen-TT Truck kit. The airbox is removed, the inlet pipe comes off, and our new hardware screws into place. Some existing kits require different engine fans, wiring modifications etc. Everything stays factory with our setup. We figure that a competent mechanic could have this system installed and out the door in around 10 - 14 hours, as we even supply exhaust pipes to join the turbochargers to the original existing GM Truck system
http://www.youtube.com/watch?v=3EITomvZL3s
Dyno testing and tuning was a straightforward affair using HP Tuners 2 bar Speed Density operating system on the 5.3 litre iron block engine. Fuelling is supplied by a set of 50lb/hour fuel injectors fed by a Bosch 044 Motorsport fuel pump. Adding a decent pump in this application is simple as the GM Truck has a full return style fuel system. A very conservative calibration was used in this application with the fuel mixture left nice and rich and conservative ignition timing in place to allow for less than perfect quality fuel in tow/haul situations. The transmission programming needed massive alteration though as the GM truck program is very sensitive to kick down due to the engines low original torque....with the Gen-TT kit in place we have the truck holding the gears much longer at big throttle openings and using its new muscular torque curve to advantage
Power gains are impressive with a massive linear rise in the power curve from the start of the ramp right through to the end. Starting out with 250rwhp we moved the yardstick to 402rwhp using 7psi boost pressure (wastegates on minimum setting) through this cars single 2.75inch exhaust system. Its pretty restrictive, but its what the majority of these trucks run, so we left it in place. Still thats 60% more power
The big gains though were to be had in the low rpm torque - exactly where we wanted them - which makes the big truck a tyre frying weapon in second gear roll on full throttle applications. If you look at the dyno curve the Silverado gained over 70% torque at 3000rpm. Thats massive, and gives the GM truck that big powerful jet aircraft feel when you sink the hammer down. Should run a very very easy mid 12
Later this week we will remove the single exhaust, wind the boost up to 12psi and go for that 500rwhp number, which we believe is very easily attainable on a stock 5.3
Aug 25, 2007 | 07:08 PM
#117
FormerVendor
Joined: Nov 2003
Posts: 356
Likes: 0
From: Australia
Originally Posted by Spoolin
These should be some fun numbers !!! you should crank it up to 17psi so we can compare it with the other stock 5.3 twin kit running around here!! Congrats
However at the moment we are concentrating on the torque development and overall integration of the system rather than a head/cam/race fuelled one shot power number. Thats a job for another time
Aug 25, 2007 | 08:49 PM
#120
FormerVendor
Joined: Nov 2003
Posts: 356
Likes: 0
From: Australia
Heres a good example of the good bottom end torque the Gen-TT Intercooled Twin Turbo system produces. Cruising at 10mph, locked in second gear the boost is instant when the throttle is floored. Note the nose lift up under power, the wheels spin hard....and its away
http://www.youtube.com/watch?v=sT4drzCC4wM
http://www.youtube.com/watch?v=sT4drzCC4wM