The Greddy Twin Turbo Kit is now being sold at autocarparts.com for $6552.00 plus $75.00 shipping. They estimate shipping around Thanksgiving. They quote 334.2 rwhp and 339.2 torque. Check out the link: http://www.autocarparts.com/part/1187/0

 

with 5.6 psi of boost , i thought the tt kit was going to put out atleast 350 whp.
this is sad.

 

thats acceptable..nice torque number though

 

low boost tho, isnt procharger at 7?

 

apples to oranges guys

 

how so? unless your referring to turbo lag, and exact power curve. pressurized air is pressurized air. and X psi at YRPM is Zpower requardless of what created the boost...

 

No, turbos are more efficient than superchargers so you net more power at lower boost. Not as much power robbed creating the boost. You also have to take intercooling into account. An efficient intercooler will significantly increase the inlet air density increasing power at the same boost level.

They are probably putting this kit out with low boost so they don't get into any reliability issues. It should be pretty simple to jack up the boost until you're happy or the engine blows, which ever comes first.

 

I think thats a good amount of power gain for 5.6 psi. The kit looks like it has alot for ppl to tweak with too. Im also willing to bet someone can easily crank up the boost for 400+ rwhp but Greddy just doesnt think its safe on stock internals so they wont advertise it.

 

Very nice tq number. I'm thinking maybe 1-2 more PSI would still be pretty safe and add plenty more power?

 

you guys are hilarious.. I love how all these people with little or no experience with FI can make comments like "1-2 more PSI would still be pretty safe."

If 1-2 PSI were really safe, GReddy would probably do it. Lord knows, they've been designing/tuning this kit for ages.

This engine isn't built for boost. If you ask me, even 5.6 PSI is taking a risk (albeit a small one).. you can't just crank up boost without regarding all the aspects of this engine that are designed for N/A..

 

Hence the "?" at the end of my question. I never said that 2 psi WILL be safe. From what I've heard though the VQ seems to be pretty stout... I don't see why 2 extra PSI with excellent tuning shouldn't be safe. GReddy kits always seem to be a little on the conservative side.

 

The VQ is built to be an NA engine.. I suppose it's stout for an NA engine, but it's just not built to take boost.

I'm sure people will buy the GReddy kit and boost 7 or 8 PSI, but they're putting themselves at a lot of risk. I'm sure you get your idea because the ATI kit runs at 7 PSI. Turbos create more heat than blowers, so that's an issue. The FMIC will cool it down.. but not as cool as the air an N/A engine breathes. Detonation will quickly go from 'possibility' to 'reality' as you start boosting higher and higher. The compression ratio is high enough (10.3:1) that running any boost at all is a risk, IMO.

If you want to run at 7 PSI, be my guest. I wouldn't do it, even with the best tuning in the world.

To make real power, you need to bite the bullet and build the motor. I've said it more than once, and the more people out there that start running 6, 7, 8 PSI, the more people you're going to see that are posting about cylinder scoring and other issues.
.

 

i think are motors can handle 7-9psi with no problem with proper tuning, theres has been RSX's runing 7-9psi with no problems what so ever, there compression is just as high as our if not I think a little higher, I've even seen 12psi on a RSX totally stock bottom end daily driven, the 12 psi only lasted 8000mi but that was for testing puposes, but our motor can handle more boost with proper tuning

 

last I checked, we have a VQ35DE in our cars, not a K20A2.

Just because the RSX can run 9 psi, doesn't mean the VQ can.

But hey, if you want to, just crank up the boost.. but don't be surprised when you have to call up the Nissan service department for a new short block.

I don't understand why everyone wants to take such a risk with their motor for a few extra horsepower. Maybe I'm the only person here that doesn't have the cash to buy a short block whenever I happen to blow one.

 

How about this. When I finish my other engine build, I'll see what the stock engine can take up to. I'll try 9psi, and move up. But you guys gotta pitch in for what I end up breaking tho! lol

Besides, I thought Top secret started blowing engines at 450whp or something like that, dunno if that's 100% confirmed or what, or another internet rumor!

 

I think you guys are goig to be mighty surprised at how few GReddy kits are actually going to be here ready to ship..........let's jsut say a little birdie told me

All these preorders makes me laugh

 

Wow, you sound like me on all those ATI threads!

Most of the aftermarket manufactures do not have the budget to do as extensive a job R&D and testing a product for release as lets say Nissan or Toyota does for releasing a new motor. Basically what happens is compromises in design or in the amount of testing that is done. We, the consumer becomes part of the testing process. With this said, I am not going to be the first one to purchase a FI product unless it comes with a full warranty on it and the motor.

Hindsight is 20/20, until then, it is speculation. We will see if 7,8, or 9 psi will last but when we do, it wont be at my expense because I am letting you guys go first (yep, I am a chicken!). Boost guys, go for it!

 

Got our orders in with Greddy, on the 1st day they started taking pre-orders.
So laugh at others

 

Not that'd I'd try upping the boost by 2
I agree though, strengthening the engine is the best way to go if you do up the boost. Even with the 5.6 psi the kit comes with, buildng the engine a little would be a good idea.

 

Agreed, GReddy has spent a lot of time with this, but 6500 bucks is a lot of cash for something thats not even gonna give you the power the ATI will at a fraction of the cost. Since superchargers are belt driven do they not spool up instantly along with the crank and other accessories? It seems as if that would give you better low end power/torque. Anywayz, i'm going the ATI route for several reasons: significantly cheaper, easier to maintain, more power than greddy, instantaneous power (i.e. no lag at all). But hey, this is one guys opinion and opinions are like buttholes....everybodies got one, some just stink worse than others.