Thread: Vtech 50 8400
10-03-2013, 06:45 AM #1
Vtech 50 8400
Hi I have rxp 07 im thinking to remap the ECU with vtech 50 8400rpm
Do I have to upgrade valve train.?
Can I use 48s injector?
10-03-2013, 07:04 AM #2
You really need to go to the VT11 injectors and do it right. 48-50 is not enough.
I have not done the retainers yet but if you were to see on the loggers how high the RPMs wind up going with these motors.....
10-03-2013, 09:28 AM #3
Why 50 and 40 injoctor is not enough if map 50?
Will it be enough if I have RRFPR
10-03-2013, 09:48 AM #4
A rrfpr will help but is about the same amount of money as just getting the injectors and fixing the issue once and for all.
I will be tuning a 8600 RPM race ski that has to run the stock injectors per the rule book in the next few days. I will know more later next week if we can at least get things acceptably close enough. I cringe at the thought of doing this but as a race boat, I have no good choices.
I would never consider it on a rec boat.
10-03-2013, 09:51 AM #5
As a side note, my ski runs a 8300 rev limit. On a 90 min log from a few weeks ago, in typical rough lake water, the motor exceeded 8700 RPM 14 times.
10-03-2013, 10:14 AM #6
10-03-2013, 10:18 AM #7
Is there a bigger injector that will fit in the 75# or larger range?
10-03-2013, 10:37 AM #8
But he would need a map for them and his other supporting mods if any. Depending on what SC the 42 should be fine till you add boost.
10-03-2013, 10:57 AM #9
10-03-2013, 11:17 AM #10
60 or 80's should get you in the ballpark then you will need to add or remove fuel to adjust you AFR requirements.
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