non-sequential on stock ECU
I've read a lot/searched about this. I'm in the process of tearing apart my car (mods in sig) to replace the notorious FPD (I had fuel pooling on the top of the engine) and my LIM gasket. Since I have to go through everything and its grandmother to get down there, I'm considering going non-sequential. My question is: While non-seq can apparently be run with the stock ECU with resistors in place of the solenoids, a lot of people say that its a bad idea. Why? If I run my current exhaust setup (I am aware of the lag ramifications) tuned with an MBC to 10 psi max and the fuel map is based on mean air pressure, shouldn't the AFR stay the same or am I missing something? Plus, who's had good or bad luck with non-seq on the stock ECU?
Thanks in advance. P7k. |
As long as you maintain 10 psi you should be fine. The car really doesn't care if it's sequential or not. Since your sig doesn't show I have no idea if you'll be able to keep the boost at that level.
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The engine doesn't care if you're non-sequential or not. The computer will figure it out. The 3k hesitation will make you want to shoot yourself though.
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Originally Posted by NissanConvert
(Post 7536156)
The engine doesn't care if you're non-sequential or not. The computer will figure it out. The 3k hesitation will make you want to shoot yourself though.
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Originally Posted by CantGoStraight
(Post 7533623)
As long as you maintain 10 psi you should be fine. The car really doesn't care if it's sequential or not. Since your sig doesn't show I have no idea if you'll be able to keep the boost at that level.
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Originally Posted by NissanConvert
(Post 7536156)
The 3k hesitation will make you want to shoot yourself though.
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the stock ecu is good up to 11.5-12 psi from what I am being told by very respected people in the rotary business. the stock maps have a lot of room built into them to avoid damage by the average Joe and low octane fuels. now that being said I would not run above 10 psi. this gives you room for cold days and spiking . I also would not run a midpipe on a stock ecu ( I know a lot of people do) I think you should have a stock cat or a highflow converter to prevent boost creep and always run good 91 or better fuel if you can get it to avoid detonation.
Jeff |
Originally Posted by Prophet7000
(Post 7536454)
Are you talking about turbo lag in general or the 3k hesitation? If the latter, why would switching to non-seq make it worse? I thought the cause of that problem was still up for debate (grounding issues etc etc etc). Thankfully that common problem hasn't plagued me. Not busting your chops, just curious.
When i punched it i'd half spool hit the hesitation (look like a retard) then take off like a bat out of hell until i hit about 10psi where i had to lift (and usually shift). Lag and 3k hesitation is not fun. I'm so happy i have a PFC. as for you: safe yes, fun no. |
@ jeff p - I've got no plans to go midpipe as I don't have the tools to port the wastegate or the money to buy a high flow (for now, I'm looking at getting an SMB) so I'll be sticking with the stock cat to prevent boost creep. As far as gas goes - 93 or better.
@ NissanConvert - Hmmmm. I wonder if that's a common problem. I haven't personally read about anybody complaining about 3k hesitation due to a non-seq conversion. Is it possible that the hesitation was a product of the shape of the car at the time (I'm sure you've got it squared away now) and not the poor man's? |
Originally Posted by Prophet7000
(Post 7536431)
Since the stock cat is still in place, I should have sufficient back pressure for the stock wastegates to regulate to the 7 psi set by the springs (without the pills). Then I'll just use the MBC I have sitting around to increase it to 10 psi. At least that's the plan.
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Originally Posted by jeff p
(Post 7537125)
the stock ecu is good up to 11.5-12 psi from what I am being told by very respected people in the rotary business. the stock maps have a lot of room built into them to avoid damage by the average Joe and low octane fuels. now that being said I would not run above 10 psi. this gives you room for cold days and spiking . I also would not run a midpipe on a stock ecu ( I know a lot of people do) I think you should have a stock cat or a highflow converter to prevent boost creep and always run good 91 or better fuel if you can get it to avoid detonation.
Jeff |
Originally Posted by CantGoStraight
(Post 7537689)
Should be a doable plan. I'm not sure why people are mentioning the 3k hesitation as this is typically things related to grounds, when the fuel pump goes from low to high voltage and the time the turbos go from primary to both. The going to non sequential should eliminate those issues since transition is gone (the reason most go to non-sequential) not to mention simplification and lag won't be that bad if you keep the car in a slightly higher rpm level, other wise a lower gear will be needed to over come this.
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Originally Posted by Prophet7000
(Post 7537643)
@ NissanConvert - Hmmmm. I wonder if that's a common problem. I haven't personally read about anybody complaining about 3k hesitation due to a non-seq conversion. Is it possible that the hesitation was a product of the shape of the car at the time (I'm sure you've got it squared away now) and not the poor man's?
Originally Posted by CantGoStraight
(Post 7537689)
Should be a doable plan. I'm not sure why people are mentioning the 3k hesitation as this is typically things related to grounds, when the fuel pump goes from low to high voltage and the time the turbos go from primary to both. The going to non sequential should eliminate those issues since transition is gone (the reason most go to non-sequential) not to mention simplification and lag won't be that bad if you keep the car in a slightly higher rpm level, other wise a lower gear will be needed to over come this.
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the stock ecu will support mods up 12 psi then you will hit fuel cut. anyone running higher boost 12 psi and up will need a re chipped ecu or stand alone. in california we can only get 91 octane so if you can get 93 in other states use it. a lot of people buy things they don't need because of hype and being in with the crowd. the 10 psi rule has been proven . if you set your boost at 10 psi the stock ecu will handle spikes up to 12 psi then you will hit fuel cut.
Jeff |
Originally Posted by NissanConvert
(Post 7538137)
every time i have money put away for block off plates i have to buy something else. I usually downshift to pass anyhow, i wasn't aware that there was a solution to 3k hes, other than buying a non-stock ecu.
Thanks for all the comments guys. I feel better about the whole process now. Hopefully this thread will help somebody else in the future. |
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