MAF Size, Part #s And WHP Output - Page 6

sr20aaron · 05-24-2009, 09:13 AM

Quote:

SR20DE MAF 91-94 Sentra SER, part # 53J00
50mm 250 WHP-----------Bored 54mm 290 WHP

I have dyno proven 13 more hp than the non bored limit,

Senora · 06-07-2009, 10:54 AM

what about a z33 maf??

Howie da dread · 07-21-2009, 02:36 AM

need help checking my z32 maf, cant get my gtir motor to make power,breaks up on boost, have fuel psi 37 off vacum,please help. have jim wolf ecu which was programed for z32 maf and 444 injectors

dfddfd2 · 11-14-2009, 09:52 PM

In the OP, it says:
SR20DE MAF 91-94 Sentra SER, part # 53J00
50mm 250 WHP-----------Bored 54mm 290 WHP

My question is, does the stock 53J00 MAF max out at 250whp because the output voltage is 5V at 250whp, or because the 50mm opening is at choked flow and will not physically flow more air than 250whp worth?

Edit:
I did some calculations and the flow velocity of air through a 50mm opening of a 2 liter engine at 100% VE and 8000 rpm is ~152mph, which is well below the speed of sound where choked flow occurs.

Dave

dfddfd2 · 12-04-2009, 05:21 PM

So is it the voltage, or the size that limits the HP?

Dave