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I was thinking of getting the OCR boost fooler from riff raff, but wanted to know if that would effect the boost numbers i see in the cab. My boost gauge is on my dp tuner PID screen which is read through the obd port. Would be nice to stop the ses light but not worth it if i would no longer see real boost numbers.
You'll never see over 24psi with the OCR installed. This prevents your truck from defueling when your boost goes over that. I installed a boost gage to see actual pressure. I installed the sensor in the AIH port (Riffraff sells an adapter plug) but you can also put a tee in the MAP line (before the OCR regulator).
You'll never see over 24psi with the OCR installed. This prevents your truck from defueling when your boost goes over that. I installed a boost gage to see actual pressure. I installed the sensor in the AIH port (Riffraff sells an adapter plug) but you can also put a tee in the MAP line (before the OCR regulator).
I think that depends on how you plumb it in, I see 25-26 on mine buts BEFORE the OCR.
I think that depends on how you plumb it in, I see 25-26 on mine buts BEFORE the OCR.
I should quantify that the 24psi is the max that the truck's MAP will see with the OCR installed so it will not defuel. Before the OCR you will read what you're really pressurized to (the only thing downstream of the OCR pressure regulator is the MAP sensor).
Aftermarket tunes don't let the truck defuel, so OCR helps with the following scenarios:
No CEL on trucks with aftermarket tuning (particularly DP) and high boost
No defueling on stock tuning
No blown MAP sensor for those with bigger injectors and turbos.
I've experienced all three.
I was wondering about that.... when i hit 25 psi i get my cel light and my boost immediately goes down on the obd port gauge from pcm, but i don't feel like there is a huge drop in performance. Tugly are you saying that my dp tuner doesn't actually let my truck defuel?
Get Gearhead tunes and don't worry about it. No need for OCR, in fact they say the OCR will screw up their tunes.
Originally Posted by Tugly
Aftermarket tunes don't let the truck defuel, so OCR helps with the following scenarios:
No CEL on trucks with aftermarket tuning (particularly DP) and high boost
No defueling on stock tuning
No blown MAP sensor for those with bigger injectors and turbos.
I've experienced all three.
I think there's a point when you overextend the OEM components, stretch them routinely past their design intent/capabilities/limits, and end up with more work-arounds/aftermarket parts. I'm not out to lay rubber down the track so I'll stick with what my OCR gives me...including a longer life for my original MAP sensor.
I was wondering about that.... when i hit 25 psi i get my cel light and my boost immediately goes down on the obd port gauge from pcm, but i don't feel like there is a huge drop in performance. Tugly are you saying that my dp tuner doesn't actually let my truck defuel?
That's correct. DP performance tunes don't defuel, but they throw the CEL with high boost... which clears in under a minute. The OCR just keeps the CEL from triggering with the performance tunes. Bear in mind, minor mods can put you in defuel territory on stock tuning - and an OCR is appropriate in that situation. I hit defuel with stock tuning, injectors, and turbo - but an AIS intake, 4" exhaust, and wastegate mods. Summing that up - air in/out mods alone put me in OCR land.
That's correct. DP performance tunes don't defuel, but they throw the CEL with high boost... which clears in under a minute. The OCR just keeps the CEL from triggering with the performance tunes. Bear in mind, minor mods can put you in defuel territory on stock tuning - and an OCR is appropriate in that situation. I hit defuel with stock tuning, injectors, and turbo - but an AIS intake, 4" exhaust, and wastegate mods. Summing that up - air in/out mods alone put me in OCR land.
Wow , im barely getting there with a 80 hp tune, but now if i just stomp on it i will hit it pretty quick. If i slowly get up to WOT it has a hard time . just put a sp turbo compressor wheel in and it seems like the mid range boost numbers are easier to get to but the higher end (for me 25 psi) it has a hard time getting there which was a little suprising to me. maybe i still have something thats not just right ... Kinda off topic but was wondering if i cut the white plastic electric connector off of my old ebpv and plug it in to the plug on my truck, will that prevent it from throwing a soft code?? I was wanting to sell my old ebpv on ebay , i heard the OBS guys will buy them, would they still want that electric connecter on there??
I need to clarify something. It has been my personal experience that the stock tuning defuels right around 23-24 PSI, and the CEL pops as I crossed the 27 PSI threshold with a performance tune. I'm speaking from a time when I had all the air mods on a stock truck (but a stock turbo).
With the EBPV in there, but the wastegate control tube completely plugged off - reaching defuel (23-24 PSI boost AND 2800 RPM or greater) was pretty easy. Since I couldn't get any more go while defueling, there was no way to climb to a point where it would throw a CEL - only a performance tune could get me to that point. Once tuned, that's not where it stopped.
Given the hardware I had at the time, and my numbers vs. your numbers... I guess I'd have to ask exactly what mods you have done to your air in/out.
I need to clarify something. It has been my personal experience that the stock tuning defuels right around 23-24 PSI, and the CEL pops as I crossed the 27 PSI threshold with a performance tune. I'm speaking from a time when I had all the air mods on a stock truck (but a stock turbo).
With the EBPV in there, but the wastegate control tube completely plugged off - reaching defuel (23-24 PSI boost AND 2800 RPM or greater) was pretty easy. Since I couldn't get any more go while defueling, there was no way to climb to a point where it would throw a CEL - only a performance tune could get me to that point. Once tuned, that's not where it stopped.
Given the hardware I had at the time, and my numbers vs. your numbers... I guess I'd have to ask exactly what mods you have done to your air in/out.
I have a S&B intake and a SP turbo compressor wheel. I have wired the wastegate shut and I still only see 25 psi with a 80 horsepower tune. I have only the stock exhaust right now but I am putting in a 4in turbo back with a areo turbine Muffler tomorrow
Jason, for reference I'm getting 25 psi, E99 turbo, No tunes, SPTurbo 5x5, wastegate shut, 4" turbo back, AIS, OCR. Before the OCR I was defueling at 22ish. I'm also at 7000' elevation.
