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123d stage 3++ vmax & performance optimisation
12-10-2017, 02:44 PM
Post: #1
BMW 123d stage 3++ vmax & performance optimisation
Hi guys,

i have a customer with a 123d 204ps at original. Now we have 310ps with custom manifold, exhaust and turbo.

The big problem on this car is the vmax, we have only 230km/h in 6th gear 5000rpm.

Customer want more and i want to improve the performance, money is not a problem for him please don't tell me to change the car i have made this suggestion but he want to stay at this 123d. I want to improve the general perf and especially the vmax.

I think that it's a gearbox issue, the shift are very short. Check attached gearbox plan.

Do you think that the 330d can match to this car ?
Another thing the turbo are now modified and can support more pression the only limiting part is the injection, do you think that a new injection pump can be used from 330d for example (6 cylinder vs 4 cylinder in the 123d)

Thanks in advance Big Grin


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Chiptuning diesel engine
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12-12-2017, 03:56 PM
Post: #2
RE: 123d stage 3++ vmax & performance optimisation
Concerning the top speed, with the original diff it should be 253km/h at 5000rpm after calculation (my 120d with the same gearbox ratio in 6 with the 123D diff make 246km/[email protected] - GPS speed) putting a 20D 177hp diff on the car could make 280km/[email protected]

Really impressed that you've already manage to make 300+ with the original fuel pump, it's the main limiting factor on these car, yes putting a 6 cylinder fuel pump is possible, but require some mods :
- Removing/blanking the EGR tube between the head and the inlet
- Cut/weld two HP rail to add a inlet, modify the pump support
- Bending a HP rigid hose to match the added inlet and properly routing it between the inlet, the alternator, the oil sump, ... (a real pain in the ass)
- Some thing i may have forgotten (put mine on my car more than 2 years ago...)

Two pics on my car (i hope your customer is not too picky on cosmetics Big Grin) :

   

   
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 Thanks given by: Mumu67 , bimmer721
12-15-2017, 04:28 PM
Post: #3
RE: 123d stage 3++ vmax & performance optimisation
Hi thanks for your reply and for the picture.

In case of advancement in this job and if this topic interest some people i will probably post picture of my work here

Regards

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12-15-2017, 04:43 PM
Post: #4
RE: 123d stage 3++ vmax & performance optimisation
VMAX was not made out, says tuner.
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