Hi guys, Im new here and was wondering if the motors on the 2008 ss/tc are forged and how much boost can the handle? Whats the most whp anyone has gotten out of one of these to date? Thanks for any input.

 

Search is your friend Welcome to the site, these motors are partially forged...crank and rods yes, pistons no, just oil squirters. There's probably 20ish of us in the 300WHP/340WTQ range around 22-23PSI with just a tune and a drop-in air filter or simple bolt-ons. I've read the block can handle upwards of 500HP...stock turbo is about maxed out in the 330WHP range though.

 

The crank and rods are forged. The pistons are not. They are cast. I don't know if they are of the hypereutetic kind though either.

There seems to be a fuel injector window timing issue above 400HP due to the nature of direct injection, so right now there's a wall there no matter what size turbo you slap on until a way around it can be found.

 

Thanks for the replies. So is the boost being turned up through the tune or with a bleeder valve? How much boost are these turbo's good for? Are these cars rich(a/f) in stock form? Has anyone tried running meth injection? Sorry for all the questions but Im just trying to educate myself with these cars. I want to see what breaking point of these cars are. Thanks again for all the help.

 

The DI system is the breakig point for these cars. I have heard and not for sure that the stock DI system with the tuning capabilities out so far they can only handle 400 whp. The A/F ratio is around 14.1 I do believe but you must remember that a DI system is completly different than your regular fuel injected vehicle. Tunes are typically shooting for a 12.1 again I think so. With my trifecta tune, Dejon Intake, and Muffler delete (dosn't help with power) I am putting down 307/361.

 

u got a dyno for that? 361 seems quite off compared to everyone else, and I really doubt u have that much of a factory freak.

 

Sure do...here tis is.



Enjoy!

 

Thats a very bold and stupid statement...I would say 50% of this board is running that, not 20ish people

 

Chill buddy, sorry for making a "stupid statement" I'm just guesstimating off the number of people I've seen post...how many SS/TC owners are even on the board? Wasn't trying to undercut anyone... Your "50%" number is pure brilliance btw...the way you came up with that percentage MUST HAVE been very methodical and planned, otherwise in your own words it's a "very bold and stupid statement", right?

 

I would agree with you. There is more people on here that on ss/sc's than ss/tc's. I am one with a tune and I love it as you can see from my dyno numbers.

 

A/F is 14.1 at wot? That cant be right. Has anyone sprayed nitrous through these turbo motors? Also is boost being turned up via tune or can a bleeder valve just be used? Thanks again for all the help.

 

Yep it is correct. You have to remember DI engines run a whole lot cooler than a regular fuel injected car, read up on them.

 

once HP tuners cracks the tables for fuel pressure, and we get some forged pistons, things will get really nutz

 

I say the blocks can handle a **** ton of power, but we really don't know that much since the fuel system cuts at around 400 hp. As Max said once HP cracks the fuel pressure code things will become craziness.

 

To answer the OP's other question, the boost is being turned up via tune in our case, it's not even so much setting the boost at pre-set amount via tune. From what I understand the maximum/target air-flow tables are adjusted to a certain point, causing the turbo to produce more boost to reach that point...on average (with the Trifecta tune anyway) that amount is about 22-23PSI. That is a very simple explanation. This turbo begins to lose effiecency at anything past that though there are members spiking to 25PSI. I would definitly NOT recommend exceeding 25PSI on a regualr basis with the stock turbo.

I know Dejon sells a MBC kit for our cars to manually adjust boost but I've read bad things about going that route, I have no personal experience with it.

 

What kind of problems are they running into with the MBC?

 

It's old technology on a technologically advanced motor...it's not a 1990 4G63, the ECU is relatively complex as well as the fact that it's a DI motor with variable valve timing...that's just what I've read that has kept most tuners from going that route. Dejon had some success with it obviously and it IS possible but the parts and labor of doing that as opposed to just plugging into the OBD2 port doesn't make sense to a lot of people.

ALSO it's only a short-term performance gain without any tuning of the ECU, eventually the ECU will re-adjust the engines airflow to hit it's target tables (what's commonly referred to as the "learn-down" feature, somewhat of a misnomer) and put the car back at stock horsepower and torque levels. If you want permanent added performance out of this engine it needs to be tuned. Hope the info helps!

 

Sure did thanks for all the info. Im thinking about just spraying it with a 100 shot to see what happens.

 

One member was spraying on an otherwise stock LNF I believe, Choko was the name on here, had some sort of problem IIRC.

The other problem with going with higher boost, the factory MAP is only 2.5bar, so 23psi is the upper limit.

 

Yea, didn't he blow his engine? And I always forget about the factory MAP sensors, you'll throw overboost codes past that 23PSI mark or so and go into limp mode, good info. I know there's a way around it without upgrading the sensors for people who tune with HP Tuners, clamping the MAP or something like that and it allows you to go above and beyond but there's some risk of over-spooling the turbo or something, Terminator on here knows what I'm talking about.

 

Hey guys,


you know I was looking into the MBC that Dejon sells and thought that would be a great idea for helping launch, but damn Dejon once again is shot down with another product. I though it would be a good idea.