Exactly what what the topic says, my g35 made 251whp and 230wtq on a dynojet. Whats roughly the bhp and btq. My calculations are saying 315bhp and 295btq. Is that right?

Crank up has too many factors going for it, I stick to WHP Only.

Assuming an approximate 15% drive train loss;
295 x 15% = 44 so 44 - 295 = 251
270 x 15% = 40 so 40 - 270 = 230
You're making approx. 15 more hp & 0 more torque than stock. You need some mods son.

251 WHP with what mods? Also how many miles on the car?

It's 20% loss it's an auto

Test pipes, 5/16, Megan racing y pipe and single exit, stock intake🤷🏻‍♂️ I now have a cold air injen behind the bumper

Correct, bone stock non-revup G35's were making about 225whp/215 wheel torque (almost exactly 20% loss). Obviously it varies a little depending on the dyno but that's a good baseline for comparison.

Thanks for info. I have 180K on my 04' 5AT coupe with a few bolt ons from Z1 I'm looking to get tuned soon.
Z1 HFC
Z1 Y Pipe
Z1 M Spec Catback (dual)
Z1 Plenum Spacer
Z1 Highflow Intake w/ JWT heatshield.
Hopefully it'll do 250-260whp tuned.

Mine had at the time of the tune 130,xxx I could have passed 260 who my tuner said if I had headers and a CAI but yeah she's at least running healthy now. No lean A/F ratio now

Finally got the car tuned and it made 251 whp and 267 torque on the dynojet.

John at Z1 do it??

No. I went with another local tuner, Countersteer LLC. Dylan did a awesome
job.