Question PETTIT UNLIMITED + Race Gas
09-02-09, 04:21 PM
#3
I wouldnt go that high, for the price you will spend on 3-4 tanks of race fuel you have the difference between the pettit and PFC :why:
I think the pettit is the best ecu for anyone happy with 12psi or below, anything above that and it isnt worth the risk vs the rewards, I have purchased many of cars over the years with blown engines and a pettit ecu.
I think the pettit is the best ecu for anyone happy with 12psi or below, anything above that and it isnt worth the risk vs the rewards, I have purchased many of cars over the years with blown engines and a pettit ecu.
09-02-09, 04:31 PM
#4
FWIW, I've seen far more cars on this forum blow their engines using a PFC verses a Pettit ECU over the years I've been on here. Now, while I say that, I know it's not the fault of the ECU. Owners purchase the PFC expecting it to solve all their problems "as is". Any ECU is only as good as it's intended purpose. With that, the Pettit ECU is not really intended to be pushed that much. Then again, neither is a PFC on the base map.
Knowing the limits of anything that is used will go a long ways in saving some money and heartache. 
09-02-09, 08:14 PM
#6
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12 PSI is personally what I would run on it. I just don't like the idea of having a computer I cant monitor and tune. There is no piece of mind.
PFC's are pretty cheap these days and they are a damn well good investment.
PFC's are pretty cheap these days and they are a damn well good investment.
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09-02-09, 10:00 PM
#8
Timing is too aggressive on that ecu in my opinion for that level of boost. You are also limited by the stock fuel injectors, which will be nearly maxed out. I recommend to keep it in the 12-13 psi range max. And yes I would definitely recommend the higher octane if you are intent on running that boost with that ecu.
Last edited by IRPerformance; 09-02-09 at 10:29 PM.
09-03-09, 02:29 PM
#9
I dont have a wideband sensor yet. I do want to go to the dyno and monitor everything. Turning boost up by 1 psi. However I'm still running insanely rich...ported wastegate....etc. A friend ran at the track on a regular basis with the exact same setup as me for months...and then went meth injection. But he was running 14psi on the track all day long... when he went with meth stayed at 14psi i believe. or maybe went to 16.
Long story short...turn it back down to 12-13psi for pump gas (91)...and running race (110) 14-16?
Long story short...turn it back down to 12-13psi for pump gas (91)...and running race (110) 14-16?
09-03-09, 02:38 PM
#10
As far as 15 or higher, I had a buddy make 359rwhp at 15 PSI with a Pettit ECU. He did use race gas for the dyno run. I don't' know if I'd recommend anything above that unless you have a RRFPR running higher than 1:1 or AI; either of them in conjunction with a wideband to monitor what's going on.
09-03-09, 06:42 PM
#12
IIRC, Pettit recommends race gas with their ECU anything over 13 PSI. However, I have done and seen others run 14 PSI on pump gas without issues. I'm not suggesting you do it, but make an informed decision as to what you do with your car.
As far as 15 or higher, I had a buddy make 359rwhp at 15 PSI with a Pettit ECU. He did use race gas for the dyno run. I don't' know if I'd recommend anything above that unless you have a RRFPR running higher than 1:1 or AI; either of them in conjunction with a wideband to monitor what's going on.
As far as 15 or higher, I had a buddy make 359rwhp at 15 PSI with a Pettit ECU. He did use race gas for the dyno run. I don't' know if I'd recommend anything above that unless you have a RRFPR running higher than 1:1 or AI; either of them in conjunction with a wideband to monitor what's going on.
09-03-09, 08:02 PM
#13
Honestly, if you are going this route you'd be better off just getting a PFC and run 4x850's. That would be an inexpensive way to get more fuel as you'll still want/need a wideband for either setup.
09-04-09, 11:12 AM
#14
Using an RRFPR is basically one old school way of getting more fuel. The stock FPR is a 1:1 (i.e. as boost goes up 1 PSI, so does the fuel). The idea of the RRFPR is to increase the boost to fuel ratio therefore providing more fuel as the boost rises for combustion. However, you need to make sure you have a fuel pump which can supply the increased fuel pressure. There is no "tuning" with this method, just more fuel.
Honestly, if you are going this route you'd be better off just getting a PFC and run 4x850's. That would be an inexpensive way to get more fuel as you'll still want/need a wideband for either setup.
Honestly, if you are going this route you'd be better off just getting a PFC and run 4x850's. That would be an inexpensive way to get more fuel as you'll still want/need a wideband for either setup.
09-04-09, 11:19 AM
#15
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i run 11psi and it runs really strong the power gains from a couple of psi are not worth the duty cycles when you can have piece of mind that your car will run good with out blowing stuff up.
09-04-09, 03:09 PM
#18
Having a smelly exhaust (if you have a midpipe) doesn't automatically mean you are running rich. Even then, running rich at idle doesn't mean much if you are lean at full boost. You need to take a look at it through a wideband to truly know if you are *safe* or not.
09-04-09, 04:05 PM
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not to thread jack you but i was wondering, i can only get 91 octane, but have access to 110. I wanted to mix to bring it up to about 98 or 95. How would i go about running the numbers on that any ideas...
