Michael_D

I tried to get this information from Fast. Tech support didn't know, and could not promise that he could get it from engineering. I suppose I could pull the intake, figure out how to seal the ports, and fill it with water, but I'm hoping someone might already know the answer.

Thanks to Hib, I have become aware of a table in the ECM logic to adjust for the added volume, and it may improve transient fueling calculations.

I wanna mess with it.

atljar

Looking forward to your findings

ian08

i to have called for this and what there runner flows in cfm he told me he did not know and that they dont have that info ******** i said

Michael_D

No call back from FAST.... shocking....not.

Called a couple guys I know that are in the porting business yesterday. Also reached out to a couple tuners I happen to admire for their work. None could answer my question. Doesn't appear this particular parameter has gotten much attention. I may have to yank the f'er off and calculate volume myself.

Dan_the_C5_Man

Either that or SWAG it - I will say I was surprised at the volume delta between stock and the MSD.

olddragger

" I want to mess with it" lolololololol---now THAT is what I am talking about!
You go Michael D!
may as well tape/puddy it up, fill it and then do the math.

MikeOC

What's involved in calculating the volume?

AzMotorhead

Math

Michael_D

The easiest way, is to figure out how to seal the ports, stand it on end, and fill it up with water. Take note of the water temp, then measure the amount of water and run the conversion of water (at your elevation), into air volume. Might be able to run some long bolts through the hold down holes, through something flat and rigid with a gasket. Suck it up to the intake. Shouldn't be all that difficult, just time consuming, and I'm not in the mood to yank the intake off right now. I have to put the interior back together first.

I'm helping a friend re-cal his Z06, and he also has a FAST 102. We are at the transient tuning stage now, and having this data would be ideal, so I could plug it in before fussing with transient coefficients (which are all a mystery to begin with).

MikeOC

My Fast is off my car right now. Going to the shop to pick it up would be a two hour round trip. Other option would be paying them to measure it. I'll think on it.

MikeOC

I'm now considering moving to MSD depending on how a couple things play out with my new build. Won't know till next week.

MikeOC

Update: Gunna stick with the Fast intake. Just got off the phone with Kohle at AHP where my car is, I am going to pay him to take the volume of the stock Fast, and then again when after he ports it. Will have those numbers for you soon Michael

edit: although, let me know soon if you've already done it haha

Michael_D

Swwwweeeettttt!

And no, I have not done anything but fight with sound deadening crap for the past several weekends (lack of motivation).

Sébast19X

793 to 796 cu in.

Hard to be more precise. Runners not removed. Complete filled to the neck. Tip in seems alot better when I blip throttle in the garage floor. This intake are not ported. But I doubt it change alot from there.

Later,

Seb

wstaab

MSD LS7 manifold is 1000 Cubic inches per MSD.

Twistedpixels

can someone explain why inputting this value is important and how it changes things in the tuning? This is something that has to be added from HPtuner themselves I know. But how is it better than just letting the MAP and MAF sensor do their thing and tune it based on them and how much airmass the sensor is seeing? I really want to know a good answer to tell my tuner when I talk to him about tuning for my MSD intake soon.

Dan_the_C5_Man

The assumption is the manifold volume parameter impacts transitional fueling. There is always a fractional delay between the intake valve and the MAF sensor.

It's not something you can see on a dyno graph - more about drive-ability.

MikeOC

Thanks for the info!

Michael_D, let me know if this is what you're looking for, I asked Kohle to hold for now.

Twistedpixels

I figured it had something to do with transitional fueling and ya if it helps driving characteristics improve then I am all for that. I will hopefully be putting my MSD and new FIC 850 injectors on in the next couple weeks and tuned. GOing from my ported FAST and I am eager to see the results. My builder did a motor over the summer for a shop that races in the Optima series autocross events a lot and had bad luck with another builder. The MSD on the engine dyno with a ballpark quick tune showed about 30hp and 20tq more than the FAST. From bottom to top the MSD was better by a lot.