Stop going by PSI! A Greddy turbo is not going to flow anywhere near the same as a base InlinePro kit! Go by horsepower if you want to work out the fueling limitations of injectors, not the PSI. The V/E of a system will define how the motor will react to increases in timing, fueling etc... So to bring up results from MASE with different setups, different turbos, manifolds etc... mean nothing in this situation.

Meth does (Octane) allow you to run more PSI and timing, and the cooling part (water) drops the IAT's from the turbo. These both allow you to make more power out of the system, but i wouldn't expect the results to be MIND blowing, especially if the tuner doesn't want to add crazy amounts of timing and the turbo is already basically maxed out on pump gas!

 

Yes it would. You have less backpressure behind the exhaust valves due to the more efficient manifold. Thats why your PSI is lower and your making more power!

I just recently bought a Full-Race manifold. My old high boost was 415whp@18Psi (ultimate Racing log manifold). I now make 425whp@11 Psi with my full-race manifold, so all PSI is telling you is that i had alot more back pressure with my old setup but was making basically the same power.

 

so..i just need a more efficient turbo like revenge's conversion if I want to make more power?

Would going from our 2.5" DP to a 3" help at all?

 

Dont forget the Greddy downpipe isnt even 2.5 inches. Its 2 inches (or less) off the turbo opening up to two and a quarter where the wastegate tube dumps into it.
IMO its a POS. (Thats why im replacing mine)
I'll get it done really soon and then have Jon tune my ride so we can see what difference it makes.

Sorry just been busy with the new house. Just bought 5K worth of appliances last night and I still need to buy the dishwasher, pay for tile and have the wood floors refinished. Glad I modded my S before I did all of this house stuff.

 

The pressure ratio between the intake and exhaust is very important to the output of a turbo car. The problem with the greddy kit and "the dip" is that the exhaust pressure momentarily exceeds the intake pressure. A properly designed system aims to achieve the opposite. It's not a deal breaker, but more of a hurdle.

 

my dip is gone

and just to clarify, so you're saying a bigger dp will help? lol sorry i'm noob.

 

Header, down pipe, exhaust, and hfc. Most of it isn't worth the small gain, as the turbo is still just an 18g. The problem with better exhaust flow on this kit is boost creep, due to the small internal wastegate. NFR had his creep tuned out by pulling timing. Everything is still kind of up in the air as to how to prevent creep. I'm porting my wastegate, installing a berk hfc, and running a ti-c. Hopefully it will turn out right. I have to get off of hurricane duty first though! I'd also like to see your first pull, and last pull. Some tunes remove the dip by lowering the tq curve right there. Not accusing, I'm just curious how your tuner did it.

 

I ordered the AEM Meth kit and the BERK HFC, I will keep it at 10PSI I want the Meth as more of a safety device then to extract more power, as far as the HFC I think it will allow just enough flow without causing creep, and if it does creep hopefully it will be tunable with the meth

 

We changed out my plugs for this tune and the dip was gone! Before I had a dip at 7K and the top end was not smooth at all.

NGK 7173's FTW.

 

7173's are not resistor plugs. I had very bad electrical problems w/them. Search the forums and you'll see much of the same.