I have a 76 V8 D4D and asked my local Toyota dealership for some time on an updated map for my cruiser to improve fuel economy . The standard answer was they can not change the mapping. However they seem to have "software updates". Those updates made no difference
After I fitted the De Graaf exhaust system and modified the airbox and intake manifold the V8 76 sometimes ran into an overboost fault code.
I took it to the dealer and they downloaded a new map. Everything was fine after that.
Checking boost pressure afterwards I noticed it was set at the max the turbo can boost. Dyno test showed around 170kW and 500Nm. In person I take wheel dyno results with a pinch of salt. Found that if you work with real time boost pressure you can do more accurate calculations than a dyno can give. Given you have the before and after boost pressure.
I doubt that you can do more than 175kW and 550Nm with s stock turbo on a 70 series single turbo V8. To produce more power you will need something like an Aussie aftermarket G-turbo. The stock turbo max boost is 1.2bar. You will need around 1.7bar to do 180kW and 700Nm. The only other way to increase power with a stock turbo is to up rail pressure for more diesel. We all know that in the end this type of tune will chase EGT.
I have a 76 V8 D4D and asked my local Toyota dealership for some time on an updated map for my cruiser to improve fuel economy . The standard answer was they can not change the mapping. However they seem to have "software updates". Those updates made no difference
After I fitted the De Graaf exhaust system and modified the airbox and intake manifold the V8 76 sometimes ran into an overboost fault code.
I took it to the dealer and they downloaded a new map. Everything was fine after that.
Checking boost pressure afterwards I noticed it was set at the max the turbo can boost. Dyno test showed around 170kW and 500Nm. In person I take wheel dyno results with a pinch of salt. Found that if you work with real time boost pressure you can do more accurate calculations than a dyno can give. Given you have the before and after boost pressure.
I doubt that you can do more than 175kW and 550Nm with s stock turbo on a 70 series single turbo V8. To produce more power you will need something like an Aussie aftermarket G-turbo. The stock turbo max boost is 1.2bar. You will need around 1.7bar to do 180kW and 700Nm. The only other way to increase power with a stock turbo is to up rail pressure for more diesel. We all know that in the end this type of tune will chase EGT.
Grips. You are 100% correct.
Don't think there are many guys out there who can get the airflow/mixtures correct hence the death of many diesels = High EGT's.
This was exactly the concern. Especially when towing, so then another mod needed to be done as Toyota don't have EGT sensors is to add sensors...
