Q45 Dyno #s

[1qckser]

Im trying to figure out the % lost thru the driveline, I tried to do a search but no luck, any help would be appreciated, thanks.

[AZhitman]

Dennis knows.

[1qckser]

I just came from the dyno, but until I hear what the % loss is im keepn my mouth shut :rolleyes, I also have vid that maybe Sultan can host again, the Q sounded sick, everyone couldnt believe how it sounded, I used a DYNAPACK that my buddies purchased a few months ago.

[maxnix]

Dennis has estimated ~20%.

[Q45tech]

Depends on tires/wheels, and fluids Plus coolant and air temperature. ...............type of dyno,etc.

Most losses are from tires [to roller], diff, torque convertor, driveshaft, in that order.

217 RWHP is good, as is 236 lb/ft at 4,000 rpm. Have seen 200-241 HP SAE corrected at 60F dyno room temp in Florida.

I usually use 21.5%..........as a rough number.

The Torque convertor is optimized fror 2200 rpm stall to help mileage at cruise [60- 70 mph]..........ATF viscosity is critical.

When you do multiple runs the fluids get thinner helping the diff but hurting the TC efficiency [but the AT pump load decreases].

[1qckser]

Here are all the specs for the runs I did, the car has 192,900 miles, the oil has 2,200 Mobil 1 5-30, knock sensors have not been changed since 1998, the car overheated once and that when they had them changed, transmission fluid has 13,000 miles on it non syn, diff has same miles but with Amsoil, tank of non ethanol fuel from MA, temp was 61.3 and barometric pressure was 29.6, relative humidity was 41.9, we couldnt get a reading on the air fuel ratio because he didnt have a cover for my tailpipes and no one wanted to stand behind the car and hold the probe, now it tooka while to get all the pereimeters setup for the run, the car ran on the dyno for about 35 minutes making slighpulls to adjust the dyno for the gear ratio and for TC slippage, we eneded up doing the pulls in 3rd because it was 1.00 ratio, my fans did come on so I know the temp was at a minimum 176, any way the #s are 227.9 hp @ apprx 5450 rpms, and tq was 239 @4400 rpm, it had 2 peaks, the 1st @5150 and the 2nd @5400, also the hp curve shows the same odd lil peaks at close too the same rpms, im gonna do it again next week because now all my info is saved and we wont have to play around with it, all in all im pleased, $1500 bucks, 192,000 thou is not too bad, I have video and will see if Sultan or some one can host it:D

[Q45tech]

The plenum and runner length are tuned to create 2 peaks 5500 and 6,000 rpm which varies with air temperature.

Common to see 4,000;4,600; and 5100 rpm torque peaks.

Not having the TB, plenum and runners spotlessly clean will diminish the 6,000 rpm peak. And REALLY affect the 6,000-6,900-7,300 range!

228 RWHP is good......as is 239 lb/ft...........better than a G35c 6 speed RW numbers...........Best HP I ever made with JWT ECU/exhaust/tweeeeeeeeks: 246 RWHP/259 lb/ft..........haven't checked mine in 3 years since 200,000 miles

HP is just rpm ratio multiplied torque so all the peaks are the same just sloped upward seesawed around 5252 rpm.

What is important is the % slope from 4,000-5100 rpm downward to redline..........this shows the volumetric efficiency decline as the valve/cam restrictions start to matter.

Takes a lot of torque to move a 4,300 pound car!

Noticed that the LS430 now has a 6 speed automatic transmission and MB is working on a 7 SEVEN speed..........our 4 speed is showing its age but the engines are still state of the art in torque per liter [with JWT ecu]!

If you are in a warm climate [where the transmission never sees 32F] try Redline High Temp ATF it will bump the numbers 1.5/2.0/maybe 2.5% with Mobil 1 10w30.

Next time measure the differential case temperature: optimum is 180-200F.

[QShip]

1qkser called me from his cell phone and told me to add a few things.

He has a K&N drop in air filter, he removed the canisters in the airbox? and drilled a 2" in the bottom of the airbox and has it tapped into the fender.

[1qckser]

Quote »228 RWHP is good......as is 239 lb/ft...........better than a G35c 6 speed RW numbers.[/quote]

So Dennis what do you think the HP and tq is @ the flywheel? the slope of the tq curve looks really good, its a nice even decline, the tq @ 5100 was still about 225-230 roughly.

[Q45tech]

What does flywheel matter it doesn't mean anything.........rough guess 290 HP/303 lb/ft.

The only thing that is significant [more than 10 HP/10 lb/ft gain] is JWT ecu.

Since the maximum restriction from the in front of rad air horn to the MAF cone in air box thru the oem filter is less than 5-6" water column [5/28=0.1785714 x 6.6= 1.17%------1.414%...............4HP is the max posible gain from any fiddling in front of MAF.

As the mileage builds the chains stretch retarding the timing relationship between piston position and primarily exhaust valves [they open a few degrees later and close later........the idle gets more ragged but the above 6,000 rpm gets more exhaust relief, so the 6,000 and above power goes up............the torque peak doesn't change in rpm or amount.

Whether the rings have worn [from dirt air filters] reducing compression determines whether the power really goes up!

[sultan]

1qckser, i tried emailing you through the forum but i don't know if it works. if you still need hosting send me an email here.

[1qckser]

Thanks, I got your email this morning, im having trouble with Windows Movie maker saving my clip so I can email it to you, im gonna try another program, Thanks again:)