Wiseco - Accelerated Performance Turbo Forged Piston Set

[Don@Accelerated]

Originally Posted by SpeedR

2JZ-GTE has 8.5 and can hit +30PSI with the right turbo. lower compression ratio will alow alow for a lot more power.

Thats not true at all. Our 2jz engines are 10-10.5:1 Flat top pistons. And we run 60-70psi!

The compression ratio does not dictate how much power you can make!

[Don@Accelerated]

Originally Posted by subatoy

makes sense. soo if you are not looking for crazy numbers you can stay with the stock pistons just fine?
I would be very happy with 250 WHP

I'll be testing 250 whp. My guess is that the engine won't fuss at 250whp at all.

Don

[20valvewynn83]

pistons are all fine and dandy but just because it lowers the compression doesn't make this safe will you guys make a heat chart of the piston when it fires and has compression in the cylinders because with the way the gas ignites the air fuel mixture this can become dangerous. i am sure you guys are all awear of this but i would really like to see some charts. One good rule of thumb is to drop compression by about one point for every 15 pounds of boost. However, keep in mind that dropping compression too far will reduce engine power when off of boost, increasing turbo lag and decreasing drive-ability. Small combustion chambers tend to do better with a deep piston dish, and larger ones do better with a shallow dish. Ideally, you want a fairly small, open combustion chamber with little to no quench (flat) area and a deeply dished piston. With the design of the top of the pistons im kind of worried about the mixture of the gas. just was hoping for a more of a semi flat style i guess.

http://www.jcmmachine.com/detonation_preignition.htm

that high spot on the piston is what im concerned about on the lower left of the picture

[Don@Accelerated]

The design needs to be that way for the direct injection. Its no coincidence that the nozzle design accomodates.

[rusty959]

Originally Posted by 20valvewynn83

pistons are all fine and dandy but just because it lowers the compression doesn't make this safe will you guys make a heat chart of the piston when it fires and has compression in the cylinders because with the way the gas ignites the air fuel mixture this can become dangerous. i am sure you guys are all awear of this but i would really like to see some charts. One good rule of thumb is to drop compression by about one point for every 15 pounds of boost. However, keep in mind that dropping compression too far will reduce engine power when off of boost, increasing turbo lag and decreasing drive-ability. Small combustion chambers tend to do better with a deep piston dish, and larger ones do better with a shallow dish. Ideally, you want a fairly small, open combustion chamber with little to no quench (flat) area and a deeply dished piston. With the design of the top of the pistons im kind of worried about the mixture of the gas. just was hoping for a more of a semi flat style i guess.

Read more: What Pistons to Use With a Turbo | eHow.com http://www.ehow.com/list_7682654_pis...#ixzz21rObHEPH


Read more: What Pistons to Use With a Turbo | eHow.com http://www.ehow.com/list_7682654_pis...#ixzz21rNqTJg0

http://www.jcmmachine.com/detonation_preignition.htm

I believe you forgot this engine is direct injection. The shape of the piston helps in this case.

Edit: got beat to the punch.

[serialk11r]

Just for curiosity's sake, how much power do you think the stock pistons could hold up to, say with ethanol? 12.5 + E85 + lots of boost usually get along fine

[20valvewynn83]

Originally Posted by rusty959

I believe you forgot this engine is direct injection. The shape of the piston helps in this case.

Edit: got beat to the punch.

yes this it true it helps the mixture but i was really conserned about the lower left part of the picture. i know on the toyota 20 valves when people would turbo them they were having this problem with the mixture. and that too is direct port

with that type of design on the 20valve they were causing hot spots in the pistons

[Don@Accelerated]

Originally Posted by serialk11r

Just for curiosity's sake, how much power do you think the stock pistons could hold up to, say with ethanol? 12.5 + E85 + lots of boost usually get along fine

By the time we throw E85 into the mix. I bet the rods will be a limiting factor!

[Don@Accelerated]

Originally Posted by kmbkk

Don, any word on pricing yet?

Don't know yet, but I would suspect pricing similar to the majority of other 4 cylinder kits.

Customs sets will be priced slightly higher.

[denkigrve]

Fantastic Don! Keep up the great work man.

[Coheed]

I hope the rods handle 350whp without issues. I've seen stock SR20 roller-rocker/VE rods pushed to damn near 600whp before failure. 500whp stock block.

But I'd be happy with a solid 350whp reliable unopened engine, if that's possible with just a few bolt ons and bigger injectors.

[noAE86]

Originally Posted by 20valvewynn83

yes this it true it helps the mixture but i was really conserned about the lower left part of the picture. i know on the toyota 20 valves when people would turbo them they were having this problem with the mixture. and that too is direct port

with that type of design on the 20valve they were causing hot spots in the pistons

FA20 is direct port and direct cylinder injection,
hence the reason for the piston top, if design is correct then piston cooling should be pretty even from the direct cylinder injection,

to solve the hot spot problem in the 20valve was only a matter of ceramic coating the top, we did this to our unlimited class racer,

don: do you think these pistons will need any coating on them?

[arghx7]

How was the piston bowl designed on these Wiseco parts?

[Don@Accelerated]

Originally Posted by noAE86

FA20 is direct port and direct cylinder injection,
hence the reason for the piston top, if design is correct then piston cooling should be pretty even from the direct cylinder injection,

to solve the hot spot problem in the 20valve was only a matter of ceramic coating the top, we did this to our unlimited class racer,

don: do you think these pistons will need any coating on them?

I believe the first set will have no coatings. The production pieces will have at a minimum skirt coatings.