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Discussion Starter #1
Im having the bottom of my motor redone [SGP racing ] and while Im at it..looking to upgrade the fuel injectors with out going to a return system . Wondering if any one on this forum has put in larger injector [380's or 440's ] and controled them with the R4program ? If not ...what would have to be done to get it to work ? I think lowering the FMU rate would be a must . Im looking at about 11 lb's boost at 7,000rpm with the 2.87 pulley , I think the 380's will work fine for the 11bl's ....Bill
 

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Discussion Starter #3
Well I talked to Split Second today . They said its no problem scaling back larger injectors...but you need to get a [scan tool] to know how far to adjust the numbers in the R4 fuel map .I've never used or seen a scan tool ....any one know what he might be talking about ?
 

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I feel confident they are referring to a basic Infiniti Diag tool. This would allow you to watch the AF ration. In our case we are going to dyno to tune so I don’t think such a tool would be necessary. Its official I get my car back on Wednesday after dyno and I will post how the R4 and RC550 work + Map examples.
 

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Discussion Starter #6
Im sure they had to do some thing with the FMU ...smaller washer I think...so it will be less of a rising rate of 8 to1 that it is now . Could you ask about the FMU ?
 

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GFWG35...hasnt posted so I will......They got the RC550 injectors to work by scaling them back with the R4 program . Thats great news for us Vortech guys that want to upgrade there fuel system . Or just add the bigger injectors and leave the FMU in place . He said no other alterations were made other than the fuel map . I havent made my mind up on which injectors I will go with...the RC's or the PE's....the PE's ......are a plug right in and the spray patern is better....but are quite a bit more money . I keep telling my self to do it right the first time , when it comes to rebuilding this motor...but its getting hard as the cost just keeps geting bigger and bigger . I just looked at metal gaskets for the heads....$190...compared to $35 [i think] for stock
 
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