CenWaSS Posted October 2, 2009 Report Share Posted October 2, 2009 Had my truck logged and my 42lb injectors are at 108% duty at WOT. Can I get away with just purchasing some 60lb injectors, if so which ones...looking for something that is plug and play. Would I have to upgrade the fuel pump? Also my IATs were very high, any recommendations to cure this or is a meth kit my only option? Quote Link to comment Share on other sites More sharing options...
misterp Posted October 2, 2009 Report Share Posted October 2, 2009 (edited) Had my truck logged and my 42lb injectors are at 108% duty at WOT. Can I get away with just purchasing some 60lb injectors, if so which ones...looking for something that is plug and play. Would I have to upgrade the fuel pump? Also my IATs were very high, any recommendations to cure this or is a meth kit my only option? A set of 60-lb injectors & in-tank Walbro 255 will work well with your combo; if I remember right, your Radix kit should have come with the Walbro 255 already, if so then yes just get a set of larger injectors & retune. The two most popular injector choices are the Siemens 60-pounders, but because the pigtails are different you need to also buy new connector ends ($60) and modify your existing wiring harness (2 hours soldering) -and- as these are taller you must also shim the injector rails with spacers; but they are proven and there is a lot of info available on modifying injector table values. The other injector choice is to get in touch with SRT10KILLER (James Verduccio) he sells a modified GM marine 8.1L injector that flows 70-pph and is plug-and-play, no adapters or shimming needed, but I am not sure as to the injector offset values etc to use when programming your PCM. Mr. P. PS if you need a Walbro 255, the cheapest/best place to get one is from Magnusson, we buy an entire kit from them for $140-ish if I remember right. Edited October 2, 2009 by Mr. P. (see edit history) Quote Link to comment Share on other sites More sharing options...
CenWaSS Posted October 3, 2009 Author Report Share Posted October 3, 2009 A set of 60-lb injectors & in-tank Walbro 255 will work well with your combo; if I remember right, your Radix kit should have come with the Walbro 255 already, if so then yes just get a set of larger injectors & retune. The two most popular injector choices are the Siemens 60-pounders, but because the pigtails are different you need to also buy new connector ends ($60) and modify your existing wiring harness (2 hours soldering) -and- as these are taller you must also shim the injector rails with spacers; but they are proven and there is a lot of info available on modifying injector table values. The other injector choice is to get in touch with SRT10KILLER (James Verduccio) he sells a modified GM marine 8.1L injector that flows 70-pph and is plug-and-play, no adapters or shimming needed, but I am not sure as to the injector offset values etc to use when programming your PCM. Mr. P. PS if you need a Walbro 255, the cheapest/best place to get one is from Magnusson, we buy an entire kit from them for $140-ish if I remember right. Thanks for feedback Mr.P. Ive already got the Walbro from Magna, looks like I be looking into the plug and play injectors from James. Quote Link to comment Share on other sites More sharing options...
RICE EATER Posted October 9, 2009 Report Share Posted October 9, 2009 hmm thats strange your dc is soo high? ive got 42lbs green tops.. i assuming the same ones as you...and my DC is must lower.. and im running a 2.9 pulley and a cam...maybe its got something to do with my truck being a 03 and yours is a 05.. which is a returnless fuel system? im still alil confused why your DC is that high for your setup..hmm Quote Link to comment Share on other sites More sharing options...
03_SS_22 Posted October 9, 2009 Report Share Posted October 9, 2009 the green tops flow more in our truck due to fuel pressure i think. im not 100% but i know they flow more. he probably has the 8.1 marine injectors. Quote Link to comment Share on other sites More sharing options...
RICE EATER Posted October 9, 2009 Report Share Posted October 9, 2009 ohhh duh.. that makes sence i forgot about the other 42lbs injectors.. Quote Link to comment Share on other sites More sharing options...
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