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Old 12-08-2007, 10:19 AM   #1
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just bought set of psi twin pipes what all modifacations need to be done before running these do i need to reflash my chip since it being a efi sled? clutch weights? and helix? I dont want to burn this sled down like i did with my 96 mxz 583 that i had with twins
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Old 12-08-2007, 10:58 AM   #2
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If you don't want to burn it down, I would stick with a single pipe. That 500 is an extremely impressive power plant as it is. I bought a 98 new and looked into the same stuff. Suzuki did a real good job with the design of that mill, getting more out of that than the 600.

I was told by several different shops this: If you port and pipe it, it will become very fragile. Once I heard that the third time frmo a reputeable shop, I looked into other mods (made it lighter).

If you want more power, upgrade to a 600 and mod that. There are more aftermarket parts out there and they are not quite as high strung to start with.

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Old 12-08-2007, 01:07 PM   #3
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The 99 motor is not "re-flashable" you will need the correct efi chip for that motor and ecu that match the pipes. You will also have to reclutch to match the power band. I suggest you contact psi and see what they suggest for changes.
If you do not increase the fuel delivery (thus the chip) you WILL burn it down. Also, I am pretty sure that pipe set requires a minimum of 93 octane. If the motor has any real miles on it I heavily suggest replacing pistons with forged units before doing any real mods.

I kind of have to agree w/ uncle wally - the 500 non-apv motor is already a high strung and finicky motor, but it produces great power for a 500 in stock form. I have the same motor in my back-up sled (98 ZL500) and I have already burned two pistons over the years playing with getting clutching just right.

good luck,

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Old 12-08-2007, 03:39 PM   #4
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I had already bought the pipes I figured for $170 for almost brand new pipes I couldnt go wrong they came off a 99 zr 600 and they guy told me he went to black magic got a chip from them but they are psi pipes and psi had told me they are pretty much like plug and play.. would a 600 chip work with my 500 with delivering more fuel?
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Old 12-10-2007, 12:29 PM   #5
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I contacted psi about what i need to do they told me they had changed policy for any information they now charge 19.99 for any information on specs I really think its a rip off for even being a customer having to pay an additional amount just for them to tell me what i need to do... anyone have any insight on what weights and helix i should run
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Old 12-13-2007, 08:07 AM   #6
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you will need to find a twin pipe chip to match your ECU, as for the helix...60/40 always works well with cats, probably red/white sec spring and a yellow/white pri...weight to max rpm
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