GT1756 hybrid lag on first gears - Alfa Romeo Forum
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(Post Link) post #1 of 12 Old 20-02-19 Thread Starter
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GT1756 hybrid lag on first gears

Is it normal to have such a slow boost buildup in first gears? From 4th gear boost kicks at about 2.1k RPM. In video - 2nd gear pull with 100% throttle from start.
1.9 JTDm 16V with GT1756 billet 10+0, 327 injectors, R80 pump, 80mm MAF, 2150 bar rail pressure, no EGR, no cats, no DPF, no swirlflaps, aftermarket intercooler.

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Is it normal to have such a slow boost build up in first gears? From 4th gear boost kicks at about 2.1k RPM. In video - 2nd gear pull with 100% throttle from start.
1.9 JTDm 16V with GT1756 billet 10+0, 327 injectors, R80 pump, 80mm MAF, 2150 bar rail pressure, no EGR, no cats, no DPF, no swirl flaps, aftermarket intercooler.
For all the work that you did, I hope you adjust the VNT? Maybe Stop Screw adjustments ?
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For all the work that you did, I hope you adjust the VNT? Maybe Stop Screw adjustments ?
VNT was calibrated in the workshop where it was built.
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VNT was calibrated in the workshop where it was built.
I mean in the ECU MAP, you see, I have a bigger turbo. And I had this situation before. Original Maps starts with position 75.00 or you can say %75 Duty cycle. You may want to lower them to get proper boost. Do you check data logs? Requested Boost and Actual boost, VNT %, RPM, IQ?
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My mapper played with this map just a little bit. Thanks for direction to go, I will try this today.
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Do you have datalogs from stock and hybrid turbo?
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(Post Link) post #7 of 12 Old 22-02-19 Thread Starter
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Originally Posted by emre2blue View Post
I mean in the ECU MAP, you see, I have a bigger turbo. And I had this situation before. Original Maps starts with position 75.00 or you can say %75 Duty cycle. You may want to lower them to get proper boost. Do you check data logs? Requested Boost and Actual boost, VNT %, RPM, IQ?
Thanks! VNT map caused that problem.
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Thanks! VNT map caused that problem.
I'm happy to hear that. And wow, good results with that Turbo, am I right? Now I wonder how is the rail pressure gone this high without damaging the injectors. I know you can add new pressure regulator and pressure sensor, and this R80 pump is good but what about injectors? Do they happy to run at 2150 bars pressure max? What about their life? I'm asking because I don't know...

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Yes, it's the same turbo. Injectors works fine. How long they will last - I don't know... Time will tell.
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Yes, it's the same turbo. Injectors works fine. How long they will last - I don't know... Time will tell.
Interesting graphics. Well done.
Please provide some more details about your project.
Is that original GT1749 turbo with billet 10+0 or GTB1756 with billet 10+0?
What is the turbo pressure at 3000, 4000, and 5000 rpm? If you have a datalog, it will be great to share it.
What rail pressure sensor do you use? From what car and what Bosch number?
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Interesting graphics. Well done.
Please provide some more details about your project.
Is that original GT1749 turbo with billet 10+0 or GTB1756 with billet 10+0?
What is the turbo pressure at 3000, 4000, and 5000 rpm? If you have a datalog, it will be great to share it.
What rail pressure sensor do you use? From what car and what Bosch number?
Sorry for misstype, it has 11+0 compressor. 454191-1 (41.5/56) 11+0.

Pressure sensor:
Quote:
Here will be all information about 2200 bar rail sensors for upgrade on Z19.
Bosch nrs:
0281002988 (BMW needs plug)
0281002948 (BMW needs plug)
0281002982 (with proper plug)
0281006064 (with proper plug)

BMW ones could be obtained much cheaper used ones with bmw plug connector then those with proper plugs.
Needs to be mapped when installed because they have different linearization.
The 0281002982 sensor (A20DTR) is with proper plug like 0281006064 one, but needs to be checked linearization by Paul Teapot. Its from Insignia 2.0 cdti bi-turbo and from Saab 9-5 2.0 TTiD (engine A20DTR).
If solder of bmw plug is hard to done, you can use any other connection solutions like WAGO.
About pinout:
1. Ground
2. Signal
3. Power supply
The connectors from bmw plug will have different colours than Z19 ones, but pinout will help you.

Full mod list:
GT1756MV billet 11+0
327 injectors
2200 bar pressure sensor
R80 fuel pump
80mm maf
4 bar MAP sensor
aftermarket intercooler
F40 gearbox swap
custom clutch (failed to handle more NM...)
breather mod
catless, no DPF, from DPF 2.4 JTDm stock exhaust

Last edited by Esnyperis; 3 Weeks Ago at 20:30.
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Sorry for misstype, it has 11+0 compressor. 454191-1 (41.5/56) 11+0.

Pressure sensor (thanks to Z19 rapid crew FB group for this info):



Full mod list:
GT1756MV billet 11+0
327 injectors
2200 bar pressure sensor
R80 fuel pump
80mm maf
4 bar MAP sensor
aftermarket intercooler
F40 gearbox swap
custom clutch (failed to handle more NM...)
breather mod
catless, no DPF, from DPF 2.4 JTDm stock exhaust
Hmm.. I wonder where this great volume of air will come out at this small turbine wheel?

The original GT1749MV turbo has a fairly small turbine wheel and very restrictive geometry compared to an original GTB1756 at which even 2.2 bars are also well above the normal ...
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