I recently installed a GT 3582r turbo and while running 29psi. I am have about the same 2 byte airflow reading as with my FP Red (within 50-100 htz). On a stock head will the the choke point become the cams? I have a Injen Intake/UCIP and buschur licp. I am running GSC S1 cams with stock springs. It seems strange to me that I would be flowing the same amount of air at the same PSI with a larger turbo. I have recently started tuning and it seems to make about the same power. It makes a little more (from 6,000+) but not as much as I had hoped. I am still tuning it and have not had enough time to iron it out.

Any ideas would be appriciated.

 

wont the MAF become a limiting factor?

 

I thought about it being the maf. I am only hitting about 2400hz though. I thought I had seen much higher numbers on a stock maf. I will have to pm melon as well and ask him about removing the honeycomb. I was thinking that maybe the duration/lift is the cams might be limiting it.

 

well S2 cams would probably be more appropriate...

but your getting into BIG turbo territory there.. poor little MAF can handle only so much...

maybe swap to SD to see if that helps..

of course the numbers will be meaningless - so use VirtualDyno to do comparisons..

 

I want to upgrade the cams for sure. I always wished I would have just gone bigger at first. GSC recommended them to me at the time for my setup. I have 112,000mi so am saving up for a engine rebuild and plan to do it all at once.

I have thought of going to SD but am haven't taken the time to fully read over what Jscbanks wrote up. It was a little over my head. It seems to have gotten easier since then. I just liked the way he was able to tie it all together.

I love Virtual Dyno. The latest version is awesome. It is very helpful when tuning. I need to find some free time to work on my tune and play with my cam gears.

 

Don't get hung up with the MAF Hz numbers. The Hz number is proportinal to a volumetric airflow. If your VE hadn't changed much from the Red to the 3582, then your volumetric airflow at a certain psi isn't going to change much either. If you're at an efficient psi for the Red compressor and turbine housing, then you should see pretty much identical numbers to a bigger turbo, especially if the turbo isn't the limiting VE factor at that psi.

It's the mass airflow that will change more and moreso at the limits of the smaller turbo, where the efficieny of the compressor will fall off and the VE of the setup will fall off.

 

So since the VE is the same. Basically the turbos would flow the same given the same setup, until I reached the limit of the efficiency of smaller turbo while larger would keep on shining?

Thank you for the responses.