power fc as a repair
So my mostly stock except a downpipe car shows a peak boost of 12.2 psi on my old school blitz dual turbo timer. Whenever I want to replicate the condition while watching the meter, I can't. (side note, does boost pressure change depending on external factors like the weather or how you are driving? it seems to be a different pattern every time I try to test it)
I have a power fc with a few other bolt ons ready to go on the car...I want to install the powerfc at least to supply to fuel needed for this extra psi. Also, at what pressure should you worry about damaging the engine? |
the stock injectors and fuel pump should not be used for anything over 14psi safely, I believe
and running over 10-12 you want a nice intercooler anyway if you have a PFC, it can control boost since you dont have a boost controller, but I would leave it at 10 until you get a new intercooler and have it professionally tuned dont mess with any injector adjustments until then of course, I could be wrong since I have not messed with my boost controller in like 7 years edit: the temperature of the air is what affects the pressure most but, if you are still running sequential, you could have all sorts of little issues that need to be addressed that would explain an iradic boost pattern |
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I'm not convinced that your engine is in danger from this. It's stock with a downpipe. There's plenty of fuel for that. It's not like you are running a 3 inch straight pipe here. If you were significantly overboosting you would have hit fuel cut, which on the stock ECU is past 12psi at most rpms:
https://www.rx7club.com/attachment.p...1&d=1292428518 There are also indications that the stock ECU runs safely at 12psi. This is from Tashima, "Sequential Twin Turbocharged Rotary Engine of the Latest Rx-7," 1994: https://www.rx7club.com/attachment.p...1&d=1292428133 80 kpa boost pressure is roughly 1 atmosphere * .80 . So 14.5psi * .80 = 11.6psi . Who detonates their engine with just a downpipe? That's a bit of a rhetorical question but you see what I'm getting at here. One thing I find interesting is that the Power FC actually has the boost target set to .80 kg/cm^2. (side note, does boost pressure change depending on external factors like the weather or how you are driving? it seems to be a different pattern every time I try to test it) https://www.rx7club.com/attachment.p...1&d=1314537732 On the Power FC it is based only on rpm and throttle position. See https://www.rx7club.com/showpost.php...8&postcount=65 I have a power fc with a few other bolt ons ready to go on the car...I want to install the powerfc at least to supply to fuel needed for this extra psi. |
wow thank you for the extremely informative post. and this is why RX7club is one of the best forums out there. thanks for taking the time to post the graphs. I will install the powerfc and keep monitoring what happens.
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Originally Posted by arghx
(Post 10764489)
I'm not convinced that your engine is in danger from this. It's stock with a downpipe. There's plenty of fuel for that. It's not like you are running a 3 inch straight pipe here. If you were significantly overboosting you would have hit fuel cut, which on the stock ECU is past 12psi at most rpms:
https://www.rx7club.com/attachment.p...1&d=1292428518 . my friends car has been doing this for probably close to 4 years, stock ecu, and its totally fine |
Originally Posted by arghx
(Post 10764489)
I'm not convinced that your engine is in danger from this. It's stock with a downpipe. There's plenty of fuel for that. It's not like you are running a 3 inch straight pipe here. If you were significantly overboosting you would have hit fuel cut, which on the stock ECU is past 12psi at most rpms.....
.....If you were planning to do a bunch of mods anyway then just go install everything but if you are wondering whether the car is safe as it sits, I strongly believe it's fine. |
Originally Posted by Speed of light
(Post 10764779)
I agree with arghx's post and assert that there's plenty of empirical evidence to back up the conclusion that there's no problem here. I would not bother installing the PFC as an antidote or repair for the condition you've described. Just drive it as is.
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^Since you already have the PFC and apparently have plans to add anymore performance modifictions ("more power")...bigger IC, cat-back, intake... and especially higher boost levels, then adding a PFC at this point is appropriate IMO.
Originally Posted by mkiv98
(Post 10764334)
.....(side note, does boost pressure change depending on external factors like the weather or how you are driving? ....
If you haven't already, read through the stickys for more info on BOOST SPIKE and BOOST CREEP and make sure you understand the differences. |
Originally Posted by mkiv98
(Post 10764837)
but I wanted to install a powerfc for more power =)
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Originally Posted by arghx
(Post 10764863)
What mods are you planning to add?
and will add intercooler later. right now I only have a boost gauge/turbo timer, so I may need a water temp gauge as well, but I believe the pfc commander has a reading for that. are injectors/fuel pump necessary at that point? I see that you wrote most of the PFC articles in the FAQs. very informative. I will run the base map according to your guide. I should be done with messing with the car after all this. Just want to keep it running reliably while maintaining a bit more power than stock. |
installed an apexi power intake and power fc. car actually runs even more rock solid and idles perfectly, does not buck, has much more power, and boost has a less erratic pattern that does not go past .80 kg/cm2.
a cop passing by stopped to take a look and tell me he had to stop and look at the fd. I believe he has similar toys on his STi :) how are is the accuracy on the gauges on the PFC commander? I was planning to get water temp an analog boost gauge but this seems to have everything I need already. |
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