560's or 650's with alky injection??

[DJ23GSX]

First off i am not trying to run insane amounts of boost. I am mearly tyring to battle heatsoak (supra smic) with the alky injection. My question is which fuel injectors should i stick with?

Right now (no alky) i can get 2-3 good pulls at 20psi with 0 knock and timing around 18* on the 560's but my idc's are nearing 90% at 48psi bfp. One the other hand i can get the same 2-3 pulls at 20psi with 0 knock and timing around 20-22* on my 650's and my idc's are around 70-75% at 37psi bfp. If don't intend to raise the boost past say 21-22psi with the alky injection how much will that affect my idc's and timing if i stay with the 650's? I don't want to run into timing issue that create knock with the 650's but i don't want to run the 560's idc's that high either.

Thanks

 

[spyderturbo007]

Well, according to your post, you are only looking to battle heat soak, so injecting straight water would be the best thing for you. Either way, it looks like the 650's are going to work out better than the 550's. 2 extra degrees of timing and no knock......sounds good to me.