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87.5mm pistons on stock K24 sleeves

5707 Views 14 Replies 7 Participants Last post by  cranny
Hi guys so the K24 will need to be bored out to at least 87.25 from what I was told. I'm going to me making over 300+whp k24/k20 turbo setup under low boost for a some what of a daily car. I was told it would be pushing it if I was going to bore the stock k24a4 sleeves to 87.5mm with forced induction . Is it safe enough to do because I could not really locate a correct answer to my question after searching online. The other thing I'm thinking of doing is just picking up new TSX over sized 87.25mm pistons and new rods and calling it a day. CP can't make me the 87.25 pistons and not sure Wiseco can I'm waiting to hear back from them but I'm worried going 87.5mm with shelf piston is pushing unless I'm wrong.
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Thanks for the helpful info guys it reall helps. Before reading this I placed my order for Wiseco 10:2.1cr pistons and Blueprint Racing H-Beam Rods and headstud kit along with upgraded wrist pins. 1. Do you think it's a must for me to do the type-s oil pump swap? I was just going to keep the k24 pump and pan. I'll look in to new valve seals also. 2. The car will be NA for the first 1000 miles or so I would say before I go turbo. I don't plan on pushing 15psi but having the option always helps thanks for the tips everyone. I'll hopefully have tempest racing do the tuning local or Innovative MotorWorks.
1. It's not a must but a highly highly recommended thing to do. It's not expensive and so very much worth it. Do it... Consider it a must...

2. Why not just hook it all up together at once the first time. You don't have to push the car. Just make sure that it stays in vacuum during your break in time. Or you can break it in on the dyno and boost it.
I may just do the type s oil pump now then :D. I don't think I will have all the parts on hand for the turbo setup but if I do I may listen to what you said and do everything at one time. I just thought it would be safer to break in the motor NA.
A turbo'd car will always be NA until you decide to get happy with your foot on the gas pedal. Do everything one time with the turbo and go from there. Just be patient, gather all the parts you need and set it up.
Np... GL
i run CP 87.5mm pistons in my setup k24a1 bottom , k20a2 head(and oil pump , lol) , blueprint rods , stock sleeves. peakboost SW manny , gt3582r. got a 3lb spring in the gate , creeps to about 9 psi at 8k rpm , lol. car is an animal , lol. dyno results comming friday , i have 2 cars to tune , mine and a buddys rsx-s which im putting together this week. id like to hit 500 whp, well see what happens.

thanks to whtrex for his insight on my build , had similar questions when deciding on my build. shes together now whtrex , works like a champ so far. hopefully will have some vids friday as well.
Sounds good man :up: Glad to hear that.. I might have some vids as well this week :rolleyes:
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