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SVTPerformance's Chain of Restaurants
Tuning À la carte
Tuning out hot start issues
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<blockquote data-quote="cj428mach" data-source="post: 15379629" data-attributes="member: 142081"><p>Don't go chasing your tail thinking its pressure not being held by the regulator. </p><p></p><p>When I first went return I swore this was the problem as my car would go from 40 psi to 0 in probably 10-15 seconds after shutting it off. I called Justin at Fore and he explained that lots of OEM systems have no check valves and they fire up first crank of the key. I ended up sending him my regulator to test and he said it was fine, I then inquired about buying a check valve as apparently my pumps weren't holding pressure. Justin said he could sell me one but he was 99.99% sure it was a tuning issue and that I would be better off not buying the valve. I ended up buying the valve just to satisfy myself and that wasn't the issue, it ended up taking more tweaking of my tune in order to get the car to start better.</p><p></p><p> My setup has changed to dead head and I'm now on e85 and I have an issue on restart sometimes that I haven't gotten tweaked out. It usually occurs once the car has been up to operating temperature and is shut off and allowed to cool part way. Upon cranking it the car will start, sputter and then die, like its barely getting any fuel. It'll take a second or two of cranking and then the car will fire up and run fine. If I try to restart the car immediately after shutting the car off it'll start just fine, it just has to sit for a 15-30 mins and the problem arises, cold starts are like factory. </p><p></p><p>Me and Malcolmv8 have discussed this and he thinks it has something to do with deadhead allowing warm fuel to sit in the rails and thats where the issue arises. He even went back to a conventional return system and the problem went away. I just can't say I buy that because with the stock PPRV system the fuel sits in the rails just like a dead head, but since I don't have a better answer I can't argue with him.</p></blockquote><p></p>
[QUOTE="cj428mach, post: 15379629, member: 142081"] Don't go chasing your tail thinking its pressure not being held by the regulator. When I first went return I swore this was the problem as my car would go from 40 psi to 0 in probably 10-15 seconds after shutting it off. I called Justin at Fore and he explained that lots of OEM systems have no check valves and they fire up first crank of the key. I ended up sending him my regulator to test and he said it was fine, I then inquired about buying a check valve as apparently my pumps weren't holding pressure. Justin said he could sell me one but he was 99.99% sure it was a tuning issue and that I would be better off not buying the valve. I ended up buying the valve just to satisfy myself and that wasn't the issue, it ended up taking more tweaking of my tune in order to get the car to start better. My setup has changed to dead head and I'm now on e85 and I have an issue on restart sometimes that I haven't gotten tweaked out. It usually occurs once the car has been up to operating temperature and is shut off and allowed to cool part way. Upon cranking it the car will start, sputter and then die, like its barely getting any fuel. It'll take a second or two of cranking and then the car will fire up and run fine. If I try to restart the car immediately after shutting the car off it'll start just fine, it just has to sit for a 15-30 mins and the problem arises, cold starts are like factory. Me and Malcolmv8 have discussed this and he thinks it has something to do with deadhead allowing warm fuel to sit in the rails and thats where the issue arises. He even went back to a conventional return system and the problem went away. I just can't say I buy that because with the stock PPRV system the fuel sits in the rails just like a dead head, but since I don't have a better answer I can't argue with him. [/QUOTE]
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SVTPerformance's Chain of Restaurants
Tuning À la carte
Tuning out hot start issues
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