Quote:
Originally Posted by BURN-BROS
It's a spicy meatball for sure!
Interesting, why only 73my(and I assume all the euro mfi)?
Well thank you very much Johnny! It was a fun build and was an relatively easy tune. I am sure you will do brilliantly.
I'll give you anecdote about a 3.2SS build I did. MODS cams 10.5/1 twinplug, Euro ports. Client ran 1.625 headers and some sort of sport muffler. The car was nice but was underwhelming in performance. The power curve was done right around 6000 rpm. The client wanted to step up to the DC60(which I love). I told him if we were to go that route I wanted the Dansk/RSR setup with George's 1.625 headers. I suggested we install these prior to a cam change as I wanted to see how it would run...It turned into a proper beast. power to 7500 after a adjustment to tune for the reduced back pressure. The client was so satisfied that he no longer required the bigger cam. It's an absolute blast to drive! So I have found that once you start getting to the bigger displacement engine, it's almost all exhaust choice that will dictate the character of the engine.
I haven't done this yet, But its on my to do list. interested to see how it goes.
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Hey Aaron,
I'm not clear on why the restrictor only on 73 but read somewhere that perhaps it has to do with the relocation of the pump to the rear in 73? Regardless, it would seem it's a valid option (adding a restrictor) if it was felt a bit more pressure was required. From what I can see you don't actually need more than slightly positive pressure at the pump head to keep fuel flow to spec, the MFI pump is a positive flow device after all. Of course if you retained the cold start solenoid you'd want to make sure you have healthy pressure.
I might try tapping the tank inlet banjo to accept a carb fuel jet and see what affect it has - once I have the entire system in the car to verify pressure/flow. I think I have some mikuni jets on hand that go down to 1.15mm.
One question about the exhaust changes on your clients motor - did the headers change in any meaningful way (both 1-5/8" OD, or ID?) or would you attribute the exhaust flow increase to the Dansk RSR muffler entirely?
It's always struck me that pushing 275-300 hp through exhausts made for 2.4L motors is going to be a struggle. Dansk coming out with the 41mm (OD) SSI's should be a help.
Lastly, do you know if that 3.2SS that you describe used a 2.4L pump with a 2.7RS space cam? I know Magnus's STR used a 2.0"S" pump which I've read works ok when calibrated for a larger motor.