03-25-2014, 10:37 AM #1
Anyone with a 137+4 on RXT 260? Tell me about real life gains?
If I purchase the Engine Tech 137+4
already have fizzle and 20R impeller
and get whatever tune v-tech says
will I be hitting the rev limiter?
What advantage would the valvetrain kit give if any with that setup?
03-25-2014, 10:57 AM #2
Just do it. Do it all.
You'll also need a fuel pressure regulator
May have to pitch to keep it off the limiter.
Valve train setup saves your motor due to high revving.
You'll be happy!!
03-25-2014, 10:59 AM #3
Stepping up the rpm will gain you more boost and more power.
Good fuel regulator.
4" intake and flame arrestor removal.
Vtech / motec
03-25-2014, 11:00 AM #4
The main function of the valvetrain kit is to allow you run higher RPM safely. The heavy duty springs/retainers don't add performance by themselves. But raising the rev limit will do wonders for performance You can run a V-Tech 8375 tune and keep the stock valve train. That will get rid of all stock computer limiters and will also let you run about 150 RPM more.
03-25-2014, 11:15 AM #5
you'll be on any rev limiter unless it's set to 9300+.
03-25-2014, 11:30 AM #6
I see no mention of monitoring AFR, like with a LC-1……..got to have it to set the FPR correctly……and you need a good data logger and software.
You can really uncork that beast but requires some smart planning!
03-25-2014, 01:31 PM #7
03-25-2014, 01:50 PM #8
no thinking about it. It's a guarantee and if you plan on touching that SC you better install a wideband o2 and monitor your AFRs
03-25-2014, 02:23 PM #9
The sound will make it all worth it ! Just make sure to monitor afrs and have a rrfpr
03-25-2014, 05:48 PM #10
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