1BadBrd

I went to the dyno and got the A/F damn near perfect. I was wanting a bigger number but i also know that 9" rearend takes more power to turn over 10 bolt. Also i have 4:33 rear gears, that also takes more power.

What is the power loss of these mods. I dynoed 360Hp and 340tq.

What would it have been if i have 10 bolt with lets say 3:73gears.

What is my engine putting out at the flywheel?

Tring to make myself feel better or the cam selection

blkchevyz

i dont think the 9 inch looses as much as people think... i dynoed the same with the 10 bolt as i did with the 9 inch. the only thing i changed was i put an electric water pump on.
what are people gaining with those like 8 hp

what are your mods?

roughneck427

What do you have done to your car as far as engine mods im curious??

1BadBrd

just stock internals with large cam high lift and heads p&p, usual bolt ons exhaust.

Also my exhaust was not uncapped i was running late and forgot to do it.

9" with 4:33 gears steel DS....

MeanGreen97Z

Tell us cam specs and flow numbers on the heads. What all bolt ons. Be specific.

crAzy95z28

better than mine. I put down 316 and 315 trq with a 355 forged 236/242 cam, stock heads/intake and a faulty knock sensor through a 3200 stall and full bolts on, no cats and a cutout..

Havnet been back yet though.

1BadBrd

well the cam is 236-242 lobe 110 lift .595/.605 (close)
heads flow around 260 @ .525/.550
Flp exhaust borla rear with cutout plugged for the dyno
Comp 1.6 RR, Spring and shing dig with cromoly pushrods
Usual bolt on electric water pump, pulley A/C delete,

Honest i was in middle of wire change when the guy said he was holding dyno day at local shop, also i need to reconnect MSD setup.

Cant wait till track day. I also got done installing Hal Qa1 shocks and better sway bar new torque arm setup, just need to fid a slight vibration within the drivetrain, but.....

I think the engine HP is what i was looking for, i knew rwhp would be a little lower cause of rearend, but what should be the lost.

What do you think my flywheel HP is around?

Injuneer

Maybe I missed it somewhere in your 2 posts.... but what tranny are you running? That makes a large difference in drivetrain losses.

1BadBrd

Trans: M6

Fuels94TA

If i remember for M6 it's a 15%, 20% for A4. So you should be little over 400 at the flywheel.

Injuneer

I actually measured the losses with my setup, comparing the engine dyno numbers to the chassis dyno numbers.

-stock T56
-Street Twin/steel flywheel
-3" chrome moly DS
-Strange 12-bolt/3.73's
-17x9.5 wheels with street 275/40's

Actual drivetrain losses ranged from 12.6% at 500 flywheel HP to 12.1% at 765 flywheel HP.

Published numbers for various rear axle configurations alone are:

-Dana 60: 5%
-GM 12-bolt: 7%
-Ford 9": 10%

I doubt there would be much difference between a 10-bolt and a 12-bolt, because they use the same geometry for the relationship of the pinion shft centerline to the ring gear centerline, and that's where the major differences are found between the 3 different rears. The closer the pinion centerline is to the ring gear centerline, the lower the losses.