High FLOW/Low Boost

[Turbojocky13]

Hey everybody! had a quick question. just finished my build (for info on it check it out here)

The build so far 700+

But I was wondering who else is getting 400+ Grams per sec on their Big turbo cars?

started tuning today for the millionth time PurpleDrank (the best) and saw I was making over 400 grams a sec on 21.9 psi (base Map) anyone else making this much and how much power are you making? I understand it's not a direct correlation, but curious. plugged the data into virtual dyno
which says I'm making...

With VVT 482hp
without VVT 447hp

Not sure if I can believe that in full until I put it on a real dyno. all the data I entered is indeed correct.

-22.97 circumference wheels
-90 degree outside air temp
-2800 lbs (100% gutted, i mean literally everything down to the steering lock) probably weighs more
-4th gear pull

[SSinstaller]

I hit 475+g/s at 25psi, but it's been a long while since my car has been on the road. IIRC VD also had me around 480hp. Never made it to a real dyno.

[torquemaniac]

I got 395g/s at 21.6psi on my 91 octane tune (0-60 test log)

Maxed my MAF at 29psi when the weather was cool last week while troubleshooting a faulty boost controller...(I didnt log g/s since my MAF curve is scaled to compensate for the meth injection, but my pre-scaled MAF curve shows 507g/s at 5V)

[zenit]

Originally Posted by Turbojocky13 But I was wondering who else is getting 400+ Grams per sec on their Big turbo cars? ...over 400 grams a sec on 21.9 psi

Sound familiar @xfeejayx;?

[xfeejayx]

I don't have the logs readily available right now, but it was something like 45 lbs/min (340 g/s) at 18 psi? That mani really does flow well, and engine speed going up will move you almost straight down on a compressor map (can't see your rpm on dyno).

But with that big custom intake on a base map, and added meth... who knows what everything is actually scaled to. You may never know what your real flow is with meth nozzles in the picture.

[Turbojocky13]

Thanks for the input guys! Was doing some research and like I thought there is no direct correlation between the two only guesstimates, there are a couple of formulas you can use but it's mostly for deciding on what size turbo you should be looking for depending on HP wanted.

One formula is ( G/s / .82) = desired hp. So (400 G/s / .82) = 487 hp and that's ball park but some say that's BHP and Not WHP

The other formula is (Lb/mn x 10) and that's way high at like 520hp

There's arguments on that one as well with some saying the following

-supercharger (Lb/mn * 1.1)(- % of driveline loss) = HP
-Turbo (Lb/mn * 1.25)(-% of driveline loss) = HP

The last one making the most since

52 Lb/mn * 1.25 -8% = 460
10% = 450 ( said 8% because Solid motor mounts and Raxles)

All very interesting stuff! Had no idea about any of this before looking into it. Can't wait to finish the tuning, put it on a dyno and see how close any of these formulas might be.

Thoughts??

[Turbojocky13]

Originally Posted by xfeejayx I don't have the logs readily available right now, but it was something like 45 lbs/min (340 g/s) at 18 psi? That mani really does flow well, and engine speed going up will move you almost straight down on a compressor map (can't see your rpm on dyno). But with that big custom intake on a base map, and added meth... who knows what everything is actually scaled to. You may never know what your real flow is with meth nozzles in the picture.

Yes I totally agree, not to mention that Giant Ram Air Headlight, the Maf is calibrated but who knows how accurate those numbers really are.