Cast Pistons and boost???

[ViperRichRT10]

I was wanting to know who has cast pistons and is running more than 5lb. of boost on a Roe Supercharger? I have a 2001 with cast pistons and am running 5lb. of boost. After talking to Sean Roe, I ordered the water/**** kit and a 6.5lb. pulley. I have not yet installed it. Sean said that the 6.5lb. would be safe if I run the water/****. After going to the VCA zone meeting in Atlanta, several people told me I would be crazy to do this with cast pistons contrary to what Sean said. Is anyone doing this already and how is it going? Survey please.....

Thanks,

 

[Simms]

Pm Fuelman.

 

[plumcrazy]

dimitrios runs that setup

 

[Mark Red GTS Cooper]

I have pics of what 6lbs do to a cast piston if someone wants to host them,

Mark

 

[ViperRichRT10]

Mark,

Were you running water/**** with that boost?


All,

I spoke to fuelman and he also runs nitrous with his water/**** and 6.5lb. pulley. Does this cool things further? He was the only positive person I ran into on this subject in Atlanta. Who has the water/**** and 6.5lbs? I have the pulley and kit in the garage but some are making me have second thoughts about putting it on with cast pistons.

Thanks!

 

[Mark Red GTS Cooper]

Rich,

The big problem with the cast pistons is the ring land, they are under 1/4 inch below the top of the piston and can be hammered into submission. The Ross Pistons I had made have a much lower ring land.

No, the water/****, it was only 5.6 lbs of boost..

Mark

 

[viperkraz]

pull the timing back a little more and add a little more fuel. With 6.5lbs of boost, would not worry me.

 

[KenH]

I have an '01 with 6.5lb pulley and water/**** injection. Many genIIIs run 7lb Paxton setups with their cast pistons. The water/**** injection serves the same purpose as the intercooler on the Paxton setup. Personally, I feel better about running 6.5lb with water/**** than 5lb alone.

 

[ViperRichRT10]

Viperkraz and KenH,

A couple of more positive experiences...Thanks! Anyone else???

Thanks, Rich

 

[RedGTS]

If you aren't prepared to replace the pistons if/when they break, don't do it. But that also applied to putting the blower on the car to start with. I cracked the top off one with the basic 5 psi kit.

 

[KenH]

If you aren't prepared to replace the pistons if/when they break, don't do it. But that also applied to putting the blower on the car to start with. I cracked the top off one with the basic 5 psi kit.

Do you think there was anything wrong with the setup that lead to the problems like heavy detonation, or did the piston just let go for no apparent reason? What's a new set of forged pistons installed cost anyway?

 

[carl B]

There really isn't that much to changing the pistons and the rewards are real amazing!

Carl

 

[Simms]

I've seen some cream puffs experience a good bit of boost creep with just 5lbs. This could cause issues on some cars to the point a piston could let go.

Seems to differ from car to car.

If you have good tuner do it, they car check these kind of things for you so you are not running in the danger zone.

 

[SUN RA KAT]

I'm running the Roe water/methanol with my Roe Supercharger and now the 6.5 pound pulley. The air/fuel is programmed fat for extra safety. This is temporary since I plan to upgrade to the Roe forged pistons, and a whole bunch more (heads, cam, fuel system) over this winter.

 

[houstonT]

It's ALLLLLLL in the tuning, if you detonate on a cast piston, you're done. I'm doing the TT and AEM combo and will tune the car safely to make sure there are no chances of detonation. I'll also throw in some race gas mixed with pump gas to make sure I have the extra cushion of safety.
Peter