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Ov replied to me about their tune and boost pressure
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Note, as I think a few people have been getting confused on our advertised boost. We see a PEAK psi of 24psi under ideal conditions. This does not mean the car will always run 24psi and to rev limit, the turbo is simply quite small for this. We see this peak psi in the lower rpm."
So that initial surge in boost in the low RPM must be what gets them the Big TQ numbers sheddy showed us. The OV tune plus the piggyback must be interesting like is200Tfowl is doing. Would probably need modifications to the turbo charger size or the waste gates that regulate the pressure to hold higher boost till redline.
Any updates on the Stage 2+ tune or the turbo modification tony? I am ready to buy!!
I do agree that the turbo is very small and runs out of breath in the higher rpm range. Very similar to my FBO 1.8T VW APR tuned, where it would spike 21-22 PSI and then eventually lower as the RPM increased. TTI has done a lot of testing to ensure that there's a balance in power by adjusting the boost, timing, VVTI engagement etc , so you will get that peak boost for the torque and it will slowly taper down while still making high end power as well. Stage 2 + will be released soon!
I do agree that the turbo is very small and runs out of breath in the higher rpm range. Very similar to my FBO 1.8T VW APR tuned, where it would spike 21-22 PSI and then eventually lower as the RPM increased. TTI has done a lot of testing to ensure that there's a balance in power by adjusting the boost, timing, VVTI engagement etc , so you will get that peak boost for the torque and it will slowly taper down while still making high end power as well. Stage 2 + will be released soon!
The biggest difference between the Vw and Lexus is the compression ratio. Because the 8ar has such a high compression you can't run as high boost as you can with a lower compression engine. We'll make more power at less boost. Bmw n20s bj4 top out around 23 psi and holds 17-18 psi. I wouldn't say our turbo isn't up for it, we can definitely get it there!
I do understand. I just wanted to give an example of another setup where the boost tapers down at the higher rpm due to a stock small turbo, and done by a reputable tuning company like APR.
Tony shared this screenshot with me. TTI is using the Techstream system which is what the dealership uses to do system checks, updates and also list some important engine parameters. These values are at 39MPH @ 2713RPM with Stage 2 +
83MPH @ 5410RPM
Techstream Diagnosis
Using the Techstream the technician can monitor the specific data lines that allow them to see what is happening in the turbocharger system. The data lines listed below are data that is directly related to the turbocharger system and should be used during the diagnosis of the turbocharger system.
Intake Air Temperature B1S1 (Turbo) – Intake temperature coming from the No. 1 Turbo Pressure Sensor located in the intake manifold. This sensor reports the intake air temperature after going through the intercooler. Can be used to diagnose intercooler efficiency. Wastegate Valve Control Duty Ratio – Target duty cycle that the VRV is receiving from the ECM to control the wastegate valve actuator.
Intercooler Water Pump Speed – The RPM of the intercooler water pump. The intercooler water pump can range from 2,000 to 7,000 RPM’s when operating.
Target Boost Pressure – The intake air pressure that the ECM is trying to receive from the turbocharger system. This data list item is labeled in absolute PSI reading. Therefore the technicians will see a target boost of close to 15 PSI when the vehicle is at idle. This is a normal condition, because atmospheric pressure is close to 15 PSI absolute. During boost conditions under WOT, the target boost will reach approximately 30 PSI, which means the ECM is requesting the maximum boost pressure of 17.4 PSI from the turbocharger system. 30-12.6= 17.4 PSI STOCK
Boost Pressure Sensor - The absolute pressure inside the intercooler. This pressure reading comes from the No. 2 Turbo Pressure Sensor. The data list item is also read in absolute PSI.
If we calculate according to this write up we will get these values for Stage 2 +
For those who would say that barometric pressure should be at 14.7 PSI then
30-14.7= 15.3 PSIStock
33.72-14.7=19.02 PSI Stage 2 + @ 2713 RPM
34.6-14.7= 19.9 PSIStage 2 + @ 5410 RPM
We are still seeing an increase of +4 PSI with Stage 2 +
Solid results. I'd love to see the the boost curve on the dyno, see how long it holds pressure and how soon it hits max pressure. I can't wait to get my tune. Solid +4psi through the power range.
Solid results. I'd love to see the the boost curve on the dyno, see how long it holds pressure and how soon it hits max pressure. I can't wait to get my tune. Solid +4psi through the power range.
Definitely! Once i get my hands on the Stage 2+ i'll have it strapped to the dyno. I would also like to test a fuel mixture of E20 or E30 and see how it performs.
Definitely! Once i get my hands on the Stage 2+ i'll have it strapped to the dyno. I would also like to test a fuel mixture of E20 or E30 and see how it performs.
For sure! as we can see in the manual the stock peak psi its at 17.4 so yes stage 2 + its hitting 21+ psi.
We are gonna have dyno tests right away and see the difference between the 2 cars with different mods and fuel mixtures using the stage 2 +. with the breathing mods like the charge pipe and the turbo muffler we are going to be able to keep a slightly better boost curve according to Tony.
Tony shared this screenshot with me. TTI is using the Techstream system which is what the dealership uses to do system checks, updates and also list some important engine parameters. These values are at 39MPH @ 2713RPM with Stage 2 +
83MPH @ 5410RPM
Techstream Diagnosis
Using the Techstream the technician can monitor the specific data lines that allow them to see what is happening in the turbocharger system. The data lines listed below are data that is directly related to the turbocharger system and should be used during the diagnosis of the turbocharger system.
Intake Air Temperature B1S1 (Turbo) – Intake temperature coming from the No. 1 Turbo Pressure Sensor located in the intake manifold. This sensor reports the intake air temperature after going through the intercooler. Can be used to diagnose intercooler efficiency. Wastegate Valve Control Duty Ratio – Target duty cycle that the VRV is receiving from the ECM to control the wastegate valve actuator.
Intercooler Water Pump Speed – The RPM of the intercooler water pump. The intercooler water pump can range from 2,000 to 7,000 RPM’s when operating.
Target Boost Pressure – The intake air pressure that the ECM is trying to receive from the turbocharger system. This data list item is labeled in absolute PSI reading. Therefore the technicians will see a target boost of close to 15 PSI when the vehicle is at idle. This is a normal condition, because atmospheric pressure is close to 15 PSI absolute. During boost conditions under WOT, the target boost will reach approximately 30 PSI, which means the ECM is requesting the maximum boost pressure of 17.4 PSI from the turbocharger system. 30-12.6= 17.4 PSI STOCK
Boost Pressure Sensor - The absolute pressure inside the intercooler. This pressure reading comes from the No. 2 Turbo Pressure Sensor. The data list item is also read in absolute PSI.
If we calculate according to this write up we will get these values for Stage 2 +
For those who would say that barometric pressure should be at 14.7 PSI then
30-14.7= 15.3 PSIStock
33.72-14.7=19.02 PSI Stage 2 + @ 2713 RPM
34.6-14.7= 19.9 PSIStage 2 + @ 5410 RPM
We are still seeing an increase of +4 PSI with Stage 2 +
Yes I like how things are shaping up, specially due to the fact that Tony managed to fix a problem some cars are having (such as mine), that is load calculations to apply correct boost on the right load parameters.
Yes I like how things are shaping up, specially due to the fact that Tony managed to fix a problem some cars are having (such as mine), that is load calculations to apply correct boost on the right load parameters.
Sorry been away guys was busy with family stuff
Glad to have you back! Stage 2 + is almost done
Very rare to have cooler weather in South FL, so why not take advantage!
I know that plenty of yours seem to be very interested only by Stage2 or Stage2+ but for people which does not wish to modify the car the Stage1 is also very interesting and performing.
Below the Dyno for both situations (stock/Stage1). The display was set to the same RPM allowing good comparative results.
For me with the TCM tune, it is very pleasant to drive and in Sport Mode/manual gear it is fantastic on little twisting roads.
Thanks again Tony for this job.
I know that plenty of yours seem to be very interested only by Stage2 or Stage2+ but for people which does not wish to modify the car the Stage1 is also very interesting and performing.
Below the Dyno for both situations (stock/Stage1). The display was set to the same RPM allowing good comparative results.
For me with the TCM tune, it is very pleasant to drive and in Sport Mode/manual gear it is fantastic on little twisting roads.
Thanks again Tony for this job.
10-24-17, 06:28 AM
was busy with family stuff
