Info: how much air flow does a stock charger flow
- Thread starter codyn
- Start date
Thanks Volker! I had seen that before, but I lost it. The IHI (LB7) map is floating around also.
I think it's about time to make a separate section for turbocharging.
I think it's about time to make a separate section for turbocharging.
i wouldnt try and run it past 3.0 PR or 45psi. thow it can make almost 60psi you are going to over speed the turbo as the engine RPM rise due to the airflow effeciency dropping on the right side of the map... flirting with 50-60% efeciency which bad
A lot of power is lost on the crappy LLY turbo inlet. Higher PR's could be realized if the inlet were better. Killerbee is doing a bunch of research with modified inlets for the LLY, his findings should be coming out shortly.
thanks for the turbo map Volker!
thanks for the turbo map Volker!
Thanks for info so at 40 psi i am not out of effenicy. I didnt think i was because it still cleans up pretty nice and has a nice mild haze to it. I guess its time to add a little more fuel and get right around 45 psi and play with downpipes and such to get it to be real effient
You're welcome, I try to find the LB7, LBZ, and LMM maps also but that takes me awile 
(bcause I go to vacation now)
PS: anybody got a serial/PN/Type .... number of them?
V
(bcause I go to vacation now)PS: anybody got a serial/PN/Type .... number of them?
V
d'pends. The PR (COP/CIP) on an LLY is over 3.0 on stock boost at sea level. The biggest mistaken assumption we make is that CIP is the same as ambient. It is a huge oversight. Subtract 4-5 psi from ambient pressure for stock boost, 8-9 psi at high augmentation. COP is affected also, there is 2-4 psi of CAC plumbing losses at stock levels, varying with compression efficiency and outlet temp.
I measured PR over 6 when i went to flagstaff (7000 ft and 11.8 psi ambient)
At sea level with new induction plumbing, near 75 lb/min is possible with low IAT. With the conditions stated above, choke occurs much sooner, about 45 lb/min, going from memory, that is with typical runaway IAT on stock LLY's.
The compressor map itself (the one linked above is valid) will only give characteristics of a compressor under standard conditions, and none of the deleterious plumbing considerations. It is a best case scenario.
IAT control and plumbing resistance reduction are the best ways to maximize flow. In theory also, pre compressor WI will elevate it.
There is a bunch of these types of discussions being featured on MaxxTorque. There is a calculator in my signature as well.
To get the GM P/N discard the first and last digit of the 10 digit supplier P/N.
In your case, it would be 98003366
In your case, it would be 98003366
