Max safe boost

Devair28 · 12-11-2012, 01:12 PM

Does anyone know what our stock piston can handle? Safely?

TomatoSoup · 12-11-2012, 01:18 PM

Asked many times and you can search the fora for more detail, but what I recall having been said is up to ~400hp (engine) for stock GXP. Of course, that statement is worth its cost

Or in other words YMMV!

40rty · 12-11-2012, 01:22 PM

Well, just to give you an idea....

Those are the stock pistons @ 26psi. If you look at the 1st ring you can see some combustion taking place passed the First ring. While a hair is expected, not a good deal of it is not good. Hope this gives you a good idea of what to expect. These pistons made 368whp 446wtrq on stock turbo.

rob the elder · 12-11-2012, 03:03 PM

While you are looking consider that GM went to sintered rods in I think 08 which are supposadly much more susceptible to failure due to knock.

Factory LE5 Connecting Rods - PLEASE READ

rob the elder · 12-11-2012, 03:13 PM

and this from KP forum
2008+ 2.4L weaker motor????? "YES"

Devair28 · 12-11-2012, 03:16 PM

Well right now the power is amazing. We are at 25 psi. Should we turn it down one or two? and about the connecting rods, i have an LNF so i dont know if that still applies.

40rty · 12-11-2012, 04:03 PM

I would do 22-23psi. Have you dyno'd?

Devair28 · 12-11-2012, 04:08 PM

Ok sweet and no we have not. I have another question for you. When you accelerate hard does load ticking happen sometimes then go away once you punch it once or twice?

40rty · 12-11-2012, 04:20 PM

Where are you hearing it come from?

Slik · 12-11-2012, 06:58 PM

@40rty so if those were the wiseco pistons would it be a different story? thinking about doing the pistons and connecting rods soon, im not tuned yet but im going to be and im at 65kmiles.

Devair28 · 12-11-2012, 10:28 PM

I think the fuel regulator. But once i have floored it a little and let the car run it goes away. and i guess my blow of valve or turbo sounds louder. also feels like i have more power. Its silver disk the connects to the rails

40rty · 12-11-2012, 11:57 PM

Quote:

Originally Posted by Slik

@40rty so if those were the wiseco pistons would it be a different story? thinking about doing the pistons and connecting rods soon, im not tuned yet but im going to be and im at 65kmiles.

regarding how they look...no matter what pistons you have you're going to have carbon buildup on the crowns. Now, the Forged Wiseco pistons are much more dense so they will be able to hold up to more horse power compared to the stock pistons. Rods are very import and the LNF's stock rods are pretty good but if you're going to be getting into the 400's then changing them out will be a good idea. I put the carillo rods in my engine.

Quote:

Originally Posted by Devair28

I think the fuel regulator. But once i have floored it a little and let the car run it goes away. and i guess my blow of valve or turbo sounds louder. also feels like i have more power. Its silver disk the connects to the rails

the Silver disk is the Fuel Pressure Reg. The ticking is the direct injection(HPFP) system. On the LNF its a noticeable sound but normal. If it bothers you, you can purchase from Crate Engine Depot a molding that goes right over the HPFP to help dampen the sound a little( I think it's like $6 or so).

Slik · 12-12-2012, 12:02 AM

thanks 40rty!

oldskool · 12-13-2012, 08:11 AM

How much boost depends on what turbocharger as well. The stock turbo is going to make more torque and "hit" harder at lower RPM, which IMO is harder on the pistons ultimately than making steady power to redline. Running it above 22psi or so is going to generation higher IATs too, and that is definitely harder on the pistons. These are really strong motors as tested by companies like ZZP, but there's only to much real abuse it is going to take. If you want more power than the stock turbo can generate at an efficient boost, get a bigger turbo and run the same or slightly more boost, and have it professionally tuned. Delta LNF guys are running 400+whp daily, the weak link for them being the clutch and transmission. We seem to be blessed with a pretty strong drivetrain overall.

I should note that I'm not just making conversation lol, i'm putting my money where my mouth is. I'm trying to wrap up an EFR turbo install now with intentions to make high 300s/low 400s on a completely stock engine/drivetrain. I'm pretty confident with a little respect for the hardware that it will take it. It's not a race car, drag car or anything like that. It's a fun weekend car FWIW.

Slik · 12-13-2012, 08:04 PM

Quote:

Originally Posted by oldskool

How much boost depends on what turbocharger as well. The stock turbo is going to make more torque and "hit" harder at lower RPM, which IMO is harder on the pistons ultimately than making steady power to redline. Running it above 22psi or so is going to generation higher IATs too, and that is definitely harder on the pistons. These are really strong motors as tested by companies like ZZP, but there's only to much real abuse it is going to take. If you want more power than the stock turbo can generate at an efficient boost, get a bigger turbo and run the same or slightly more boost, and have it professionally tuned. Delta LNF guys are running 400+whp daily, the weak link for them being the clutch and transmission. We seem to be blessed with a pretty strong drivetrain overall.

I should note that I'm not just making conversation lol, i'm putting my money where my mouth is. I'm trying to wrap up an EFR turbo install now with intentions to make high 300s/low 400s on a completely stock engine/drivetrain. I'm pretty confident with a little respect for the hardware that it will take it. It's not a race car, drag car or anything like that. It's a fun weekend car FWIW.

i hope everything works out, i would too like to be in that power range for a daily car, i just have to keep researching lol oh and yea the money