Top Swap Pulley Size

[xcwilli11]

So I'm top swapping, i will be running sd headers, 1.9 rockers, a cai and 1 3/8 on radiator on a gen 3 supercharger. After i let my car get used to the boost what size pulley could i use? (i will be using the stock GTP injectors)

[REDCRAPGP]

Nobody knows every car is different you need something to measure KR and to make sure your timing is where it needs to be.. If zero knock and good timing then you start to pulley down


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[chrsmi1]

2.55......

[xcwilli11]

2.55 hahahahahahhahahahahahaha

[xcwilli11]

And okay thanks ill wait and see

[nos4blood70]

Start with stock.

[Slick2500]

3.5

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[The Guz]

Start with stock.

This.

[holyghost]

You may even wanna start with the 4.0 pulley and check for kr due to the higher compression ratio of the na pistons.

[sseilmnop]

Rockers and headers you can start with 3.8"

[GXPKILLER]

I have a top swapped 06 with a Gen V, stock gtp injectors, 2 bar map, headers, and a zzp gtp pcm and I have 0 kr with a 3.8.

[blueguy]

I have a top swapped 06 with a Gen V, stock gtp injectors, 2 bar map, headers, and a zzp gtp pcm and I have 0 kr with a 3.8.

And a fuel washing PCM, of course it doesn't have KR.

[nos4blood70]

Probably running rich as hell, but that's ZZP for you. You'd probably go faster with a bigger pulley and more timing.