Friday, Mar 04, 2016 at 09:14
Hi Tim,
If I was in your shoes I wouldn't be happy either! If you asked for a DTS kit and got something else the least I would expect is a heads up.
Now to give some
feedback to your questions:
I have a 2003 HZJ105 with a AXT Turbo + 2.5 inch exhaust. It's done about 150,00 kms since it was installed. I have had no issues with the setup and she's just ticked over 230,000 kms. It's a Garrett, water cooled turbo and I fitted an air-over-water intercooler about 12 months after the turbo was fitted to help with exhaust gas temperatures (EGT). I've also fitted a boost and EGT gauge to monitor the turbo's behaviour while driving.
The 1HZ doesn't like running high exhaust temperatures (say 500+ degrees C) for extended periods without long term issues cropping up down the track. The air fuel ratio is the only variable that a workshop can play with on these motors and this is achieved by balancing fuel load and boost. I've got
mine set at 12psi boost (max) with the intercooler and this keeps the EGT around 450 degrees under load. If it gets higher than this, I back off on the "go peddle" to keep EGT's below 500 degrees. Pre intercooler, the boost was set at about 8 psi to keep the EGT's under control. I'd recommend you install some gauges in your 4WD to monitor the turbo as
well.
The DTS kit installed by MTQ in
Melbourne is often tuned for maximum performance (read into this higher fuel load and higher boost) to get the biggest improvement in performance. If that is normal practice for a DTS kit I could
well understand the comments about higher temperatures. I had MTQ in
Melbourne do a dyno tune on my 4WD some time back and yes, got the power improvement but found the EGT's went up too high and the fuel consumption went up a fair bit as
well. Ended up taking it back to AXT to "de tune" it so I had a better balance between fuel economy, power and EGTs. Ultimate power is not my priority, responsiveness when highway cruising and descent fuel economy are my main objectives. You might want to reflect on your reasons for the turbo with the above in mind.
Water cooled is considered better than oil cooled because the oil doesn't "cook" in the turbo galleries when the engine is turned off and the turbo is still very hot. Can lead to eventual blockage of galleries (I believe) and a blown turbo. This
feedback is not based on personal experience, just research I did when first considering the turbo upgrade. If you have the oil cooled turbo, a turbo timer might be a good investment to cool things down before stopping the engine and oil flow, particularly after some hard work by the engine?
Fitting a turbo to the 1HZ, which is not designed for positive air induction, needs to be undertaken with an understanding of the impacts the turbo has upon the old motor. Keep the boost, fuel load and EGT's down and you'll have many years of improved performance without issues. Push the old girl to its limits and wait for the big bang. The 1HZ does need some TLC for longevity if a turbo is fitted.
Hope you sort out the situation with your workshop.
Cheers
Rob K
AnswerID:
596949
Follow Up By: Member - WBS - Sunday, Mar 06, 2016 at 10:04
Sunday, Mar 06, 2016 at 10:04
Rob,
With the exception of fitting an intercooler, your experience with the 1HZ engine matches
mine. I had an AXT turbo fitted to my 80 Series. You have pretty much encapsulated my thoughts too.
WBS
FollowupID:
866037