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Anyone use Rail Pressure #4

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Old Nov 26, 2008 | 05:43 PM
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From: NorCal
Anyone use Rail Pressure #4

Has anyone used TNT RP#4 for daily driving???

I have been using RP-3 for about a month and love it. Great throttle response and quick spooling, but loaded RP-4 today to give it a whirl.

Idle RP is up to 9K and 70mph is up to 20K, whats real nice is anything past 1/4 throttle RP jumps to 23K and slowly climbs up to 25.5K and holds. I know that this might be a little high but has any one tried it for a long term deal???
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Old Nov 26, 2008 | 09:54 PM
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I would use it when i need it, but not for daily drivin, pressure is not good all the time, i know Rp#2 is safe but i think BOB would tell you diff on 3 and 4
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Old Nov 28, 2008 | 11:37 PM
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Les I like 3, but have not tried 4 yet. Even on the dyno I was running 3. Forgot to change to 4, wonder if it would have put me over 650hp....LOL I dom like my mp-8 right now
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Old Nov 29, 2008 | 06:36 AM
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I am also curious about the RP3 vs RP4. I ran the Beta 4.2 for quite some time and I think that also had high RP. I have been running the RP3 on Revo and TNT and also like the setting. I did like setting it on RP4 but took it off as the documentation recomends. I need to add a RP guage so I can monitor this. I also run the GDP 2 micron filter in front of the CP3 and am wondering if that helps prevent problems if using the RP4 setting as a daily option?
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Old Nov 29, 2008 | 08:13 AM
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I dont think rp3 or rp4 is good for daily driving and long injector health....think it was Don at F1 that said anything above 18k consisantly is bad for your injectors....plus smarty documentations says no rp3 or 4 for daily....I'd feel more confident running rp3 daily if i had aftermarket injectors
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Old Nov 29, 2008 | 10:02 AM
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What pressures are the people that run Smarty and MP8 run for daily driving? I would think ading the MP8 on top of Smarty must be running pressure pretty high?

Is the Revo and TNT the same pressure for RP3 and RP4?
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Old Nov 29, 2008 | 04:30 PM
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I run my RP on 2 and only use the mp-8 when I want to play.There is no way I would run 3 or 4 for daily driving.The sustained high RP is gonna make for short lived injectors.The mp-8 at 50% is more than enough to ramp the pressure up to 25k+ when needed.
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Old Nov 29, 2008 | 05:49 PM
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when i was stacking my pda and the smarty i was running around on rp 3 and 4 and hammered all six injectors haha whoops well now I have a rp gauge and got rid of the pda as well as run the smarty on rp 2....
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Old Nov 29, 2008 | 06:57 PM
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I don't run any pressure with Smarty. If I need pressure, I just reach for the mp8 **** which also stays off unless I want to play.
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Old Nov 29, 2008 | 09:24 PM
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Originally Posted by jgiachino
I dont think rp3 or rp4 is good for daily driving and long injector health....think it was Don at F1 that said anything above 18k consisantly is bad for your injectors....plus smarty documentations says no rp3 or 4 for daily....I'd feel more confident running rp3 daily if i had aftermarket injectors
IIRC, the Smarty documentation only warns against using RP4 in TNT for daily driving.

Rail pressure:
# 0 - Default
# 1 - Stock
# 2 - Mild
# 3 – Moderate
# 4 – Wild*
* In order to avoid damage to the injection system, do not use for prolonged time.


I run RP3 all the time and see ~13K while cruising down the highway. Only goes up when I get on the throttle.
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Old Nov 29, 2008 | 10:33 PM
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From: Phoenix, AZ
Originally Posted by jtharvey
IIRC, the Smarty documentation only warns against using RP4 in TNT for daily driving.

Rail pressure:
# 0 - Default
# 1 - Stock
# 2 - Mild
# 3 – Moderate
# 4 – Wild*
* In order to avoid damage to the injection system, do not use for prolonged time.


I run RP3 all the time and see ~13K while cruising down the highway. Only goes up when I get on the throttle.


Marco makes great software, but he and Bob need a tech writer...see the standard revo instructions...it has the warning on rp 3 and rp4...and it's more mild software....so if i were guessing, they just forgot to put the warning on the TnT Instructions...

That being said ~13k at cruise is very good....mine shows ~17-18k at freeway cruise with any amount of throttle.
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Old Nov 29, 2008 | 10:50 PM
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Originally Posted by jgiachino
..see the standard revo instructions...it has the warning on rp 3 and rp4...and it's more mild software....so if i were guessing, they just forgot to put the warning on the TnT Instructions...
Good point. I hadn't noticed that. Makes me wonder if there's an RP difference in standard revo and tnt, or if it's just an editing difference.
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Old Nov 29, 2008 | 11:17 PM
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I can see 17k Rp on stock tune at 70mph so 13k seems low to me.Running RP2 I see 18-20k at 70mph and slightly more on small grades.I tend to back the Rp down to 1 on long road trips so that it stays in the 17k range while at interstate speeds.Being your motor is an 04 I can see it being slightly lower but not that low.
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Old Nov 29, 2008 | 11:24 PM
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I thought that 13-14K was pretty normal for an 04 truck. It's right on par with a guy here in town who's got an 04 and seems to be what a couple other guys I've talked to with 03's are running. I know the 05+ motors run more RP, but don't know how much difference there is. I'm still learning.

As soon as I roll into the throttle, the RP picks up. On a long WOT pull (SW5, TNT), RP also holds at about 22K.
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Old Nov 29, 2008 | 11:35 PM
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From: N.C.
I don't know all the specifics of the 03-04 motors,only that they do run lower RP than the 04.5 and up,but you running RP 3, I would think that it would be much higher than that at highway speeds.What are you using for a RP gauge?
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