Convert a SP1 to an SP2

[Waldo]

What does it take to convert an SP1 throttle body to an SP2? Do the heads have different diameter bores in the intake side? What about the ECU? Fuel pump?

[06450F]

Its going to take quite a lot as the ECU is different (more memory) on the SP-2. That combined with the TB issue is a bit intensive. Unless you are racing for tenths of seconds the few HP you will gain are far out done by the likely cost to do the conversion.

[toptaz1000rr]

dont mean to thread jack but since the heading is relavent...

what does it take overall to convert an sp1 to an sp2..

i have a 2000 frame and both sp1 and 2 swingers... what are the benefits to using one over the other..

ps this bike will never be a track bike.. only a street weapon

[dstewart]

Originally Posted by Waldo

What does it take to convert an SP1 throttle body to an SP2? Do the heads have different diameter bores in the intake side? What about the ECU? Fuel pump?

You need SP2 throttle bodys and boots, a Thorsten/TurnOne style airbox and a Power Comander with a custom map. Thats it, the SP1 ECU will run the SP2 injectors just fine. Make sure the SP2 throttle body's include the sub harness for the SP2 injectors, it will plug in to the main harness with no problems.

The fuel pump is the same, the intake on the heads are the same just he rubber boots are different. The SP2 ECU has a different map (and a faster cpu but that really doesn't matter much) that can be easily corrected by a power commander and a custom map. The SP1 airbox wont fit with the SP2 t-bodies, but the Thorston/Durbahn style will work with either.

[TLRSKUNK]

I have heard that the SP2 TB's will gain on top but can loose some midrange Punch.

[06450F]

I would have to disagree that a PC can make up for the difference in ECU's.

Sure the PC can compensate for the overall fuel delivery but not for the general reaction of the computer(ecu).

The higher memory ECU's will have more input coordinated for both the timing and fuel delivery; plays a significant role in throttle reaction and overall smoothness of the motor.

If you were to ride a first generation GSXR750 and a second generation back to back, or a CBR929 then CBR954 the difference (not in power) but in throttle and reaction is clear. I personally feel as the FI systems have improved on more recent models the increase in ECU volume is likely not as apparent.

IMHO unless one were to have access to the required parts to do this mod extremely cheap I don't think its worth the hassle for the modest gains.

[dstewart]

The SP2 ECU is faster but you will never feel the difference, either ECU is faster then your hand or the ability for the engine to gain revs. As far as what you are calling memory, the SP2 map is more detailed with more look up points. A PC3USB if mapped per cell completely overrides the ECU map look up at every 250RPM and 10 % of throttle position. There could be slight ignition mapping differences between the two ECUs that only a PC3r could correct for.

In short everything else equal, you can not tell the difference between the SP1 or SP2 ECU with a properly mapped PC3.

That said, the question was how too not if it was worth it. Im my opinion it is not. I have both on the dyno and made more power with the SP1's.

[herrman]

Originally Posted by Waldo

What does it take to convert an SP1 throttle body to an SP2? Do the heads have different diameter bores in the intake side? What about the ECU? Fuel pump?

the sp2 get bigger bores in the intake side.maybe it will fit if you machine the sp1 rubbers.ecu and fullpump is'nt a problem.
i have good experience with an Motty AFR Tuner.works much faster than usb pc.maybe they bring the pc5 for the rc.

[jgos929]

Originally Posted by Waldo

What does it take to convert an SP1 throttle body to an SP2? Do the heads have different diameter bores in the intake side? What about the ECU? Fuel pump?

Dont do it you'll regret it. As said before you'll lose some down low where you need it and gain some up top where you dont. Also if you search there is a couple of people on here that have done it and one that I know of that provided dyno results and determined that its a worthless project.