What is the FPR setting for Comptech SC?
06-07-2005, 02:03 PM
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What is the FPR setting for Comptech SC?
I changed to SARD fuel pressure regulator long ago for higher boost. I am now going back to 7lb boost. However, I don't have the Comptech unit anymore... So, I am wondering what is the pressure setting on Comptech unit? I will just twist it to the Comptech setting to make it work, whoever knows it or whoever has the pressure meter, would you please share, thanks..!!
06-07-2005, 04:55 PM
#3
IIRC the Comptech is stock static pressure (47-54psi). But unless you're using injectors and an E-manage or similar you need an FPR with a rising rate ratio the same as the Comptech.
I wouldn't be making changes without some A/F monitoring.
And someone had a Comptech RRFPR for sale recently in the For Sale section. Might be a better option.
I wouldn't be making changes without some A/F monitoring.
And someone had a Comptech RRFPR for sale recently in the For Sale section. Might be a better option.
06-07-2005, 10:24 PM
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AusS2000- Are you sure about that? Comptech was testing the Synchronic regulator I designed and their big gripe was that it wouldn't pull fuel pressure down to 35 at full vacuum at idle. They said that they needed to pull back that much fuel pressure to pass smog.
I think that their bypass orifice diameter is just too small for the Walbro 255.
I think that their bypass orifice diameter is just too small for the Walbro 255.
06-07-2005, 10:51 PM
#7
About the pressure, or the ratio?
The pressure I double checked with Joe Sierro at Comptech when I installed mine.
As for the regulator being rising rate, it most definitely is as it's the only form of tuning used on the Comptech kit. Once pressure gets to ambient the ESM hides the MAP signal from the ECU and additional fuel is delivered by upping the pressure in the fuel rail. It does this by using the boost pressure on the FPR with a ratio so that for every lb of boost fuel pressure rises proportionally. It's only the ratio I am unsure of.
The pressure I double checked with Joe Sierro at Comptech when I installed mine.
As for the regulator being rising rate, it most definitely is as it's the only form of tuning used on the Comptech kit. Once pressure gets to ambient the ESM hides the MAP signal from the ECU and additional fuel is delivered by upping the pressure in the fuel rail. It does this by using the boost pressure on the FPR with a ratio so that for every lb of boost fuel pressure rises proportionally. It's only the ratio I am unsure of.
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06-07-2005, 11:16 PM
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Originally Posted by AusS2000,Jun 7 2005, 07:55 PM
IIRC the Comptech is stock static pressure (47-54psi). But unless you're using injectors and an E-manage or similar you need an FPR with a rising rate ratio the same as the Comptech.
I wouldn't be making changes without some A/F monitoring.
And someone had a Comptech RRFPR for sale recently in the For Sale section. Might be a better option.
I wouldn't be making changes without some A/F monitoring.
And someone had a Comptech RRFPR for sale recently in the For Sale section. Might be a better option.
for the 47-54 psi, are you saying that pressure is when the car is in idle and rpm stays around 1000 rpm?
06-07-2005, 11:21 PM
#9
No, it's static pressure. You remove the vacuum line from the FPR so it is seeing ambient pressure and set it to that range. At idle (vacuum) it will actually be lower (I guess that is what synapse is referring to). In boost it will be higher.
As for economising by not buying the Comptech, there is no sense in saving $50 if it costs you an engine. But if you have a current solution using the SARD and a smaller pulley then I assume you will be able to have a safe solution with a bigger pulley.
As for economising by not buying the Comptech, there is no sense in saving $50 if it costs you an engine. But if you have a current solution using the SARD and a smaller pulley then I assume you will be able to have a safe solution with a bigger pulley.
06-07-2005, 11:26 PM
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correct me if I am wrong since my English ain't as good as you guys. are you saying that with same pressure setting, it might result in different story since they are 2 different units??
however, for Comptech FPR, will it change the pressure when I am in the neture-gear and try to rev it up? if it doesn't, I will try to find my original comptech FPR, cuz I thought it was broken since it didn't change the pressue.
however, for Comptech FPR, will it change the pressure when I am in the neture-gear and try to rev it up? if it doesn't, I will try to find my original comptech FPR, cuz I thought it was broken since it didn't change the pressue.