steve260z Posted February 4, 2010 Share Posted February 4, 2010 Using a p90 with Su carbs, sm needles,stage 2 schneider cam,header and exhaust. If I recall correctly the p90 will not accept a mechanical fuel pump. Either way what specific pump should I use? Currently have a 260 with the electronic and mechanical pump on the car. Quote Link to comment Share on other sites More sharing options...
T-Bone028 Posted February 4, 2010 Share Posted February 4, 2010 I have the same set-up P90 head with SU's, cam with 480 lift/274 duration, 6-2-1 header/2.5 exhaust. Using a Holley blue fuel pump (loud as hell) with a Fuel pressure regulator set at about 4 psi. Quote Link to comment Share on other sites More sharing options...
steve260z Posted February 4, 2010 Author Share Posted February 4, 2010 Did you try any other needles? SMs are good? Figuring I'll have to tune a fair bit. Loud as hell?? The pump? Air intake? Exhaust? Quote Link to comment Share on other sites More sharing options...
T-Bone028 Posted February 4, 2010 Share Posted February 4, 2010 SM needles should be just fine. A lot of folks have said they are too rich for a stock motor...but this wont be stock will it! SU carbs are great, simple, and they work just fine for a street driven 3.1L. And as far as loud, I meant the fuel pump. Well the car itself is loud, I have a resonator and a supertrapp with no discs so thats my fault...its still pretty darn loud even at idle. Under acceleration I cant even hear the fuel pump . My holley fuel pump is rubber mounted, but again, its still pretty loud. I'll be getting back under the car this spring to see if I cant quiet it down some more, but I doubt it. A lot of folks recommend the carter pumps for a quiet electrical fuel pump. I might go with one myself if the fuel pump noise keeps bugging me. Quote Link to comment Share on other sites More sharing options...
Zmanco Posted February 4, 2010 Share Posted February 4, 2010 You could try a Walbro. I have the GSL394 190 LpH and at your low pressures for carbs it will have no problem keeping up at those power levels. Once the engine is running I can't hear it at all. It's mounted in front of the fuel tank where the factory pump would go. Get their mount kit which includes a foam rubber sleeve and straps to isolate the vibrations. Quote Link to comment Share on other sites More sharing options...
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