vioilio

Just got the car on the dyno today.
Brabus K8 Package
Evosport Cooling Package
Evosport Plugs + Wires
S/C Phenolic Spacers

Car is running very very rich. Not sure what is wrong here. We got it lunched at 4th gear 1700-1800 rpms. Any ideas, comments or suggestions?

Yes she was in Dyno Mode!

EcruisinUSA

dirty injector stuck open? dunno. maybe just the tune.

e55amgrocket

What tune does it have? Was it heat soaked when the runs we're done? Most pulls are made in 3rd gear with these cars to help with heat soak and I think it's closer to 1.1 ratio

ahmad0658

Is the car tuned? Who tuned it? is it standard tune or custom? You need to tune while on Dyno.

vioilio

Car does have brabus tune from the k8 package

gaspam

it says its a brabus k8 so i would assume the tune that came with the brabus k8 package which as far as performance only adds a i/c pump and underdrive pulley ? tune is probably nada

chawkins2001

Your problem is you had the car in the wrong gear on the dyno. You should have done the pull in 3rd gear bro. 4th gear is way to long of a pull, engine gets severely heat soaked, ecu tries to compensate and cools things down by dumping a **** load of fuel, and the results are a super rich condition. 3rd gear will also ready much higher.

vioilio

I think the guy at the dyno had no idea how to properly dyno this specific car. They do American muscle cars only. Any specific recommendations as how exactly to do the pull again? What rpms should I launch it, etc....???

My car runs great! Pulls very very hard and there are no hesitations of any sorts.

EcruisinUSA

Not to speak negative about this shop or the guy who runs it since he's not here to defend himself, but...

I would find a new shop.

Thericker

4th gear on the 5 speed slush box is the Correct 1:1 ratio for Dyno runs, 3rd gear results in false higher #'s...
Just ask Jeremy of OE Tuning or Marcin of Speedriven they both know far more than ALL of us on these matters & mirror my statements..

Hammer Down

When are you bringing that beast up to Sac?

skratch77

the video in my sig is a 4th gear pull on a cold engine.

I would log intake temps to see if you pump is working and go from there.Did they put the car into dyno mode? was it a 4wd dyno?

Maybe the dealer flashed the stock software back on the car at some point.I would check out your intake temps first and see how those look.

vioilio

Car was not cold when they did the pulls. I drove it to the shop and it went straight on the dyno. Dyno was Dynojet 224xLC 2WD. Correction Factor was SAE Smoothing 5. They let it cool down for about 10min between the 2 runs. Is there any way I can test my pump and see if it is working? I have a faulty SBC but the car was IN Dyno mode so that should not matter?

GT-ER

Dear Lord, it will not give "false higher numbers". I've done 4th gear runs before and the power was slightly HIGHER in 4th than in 3rd. The problem with a 4th gear pull is that it takes FOREVER and without a good cool down the IAT's will get pretty high since my dyno has very poor air flow ( almost none to be precise ). Now, a HOT 4th gear pull will read lower since the IAT's will sky rocket and dump fuel...it's not that the dyno will read more accurately, it's the car dumping fuel and timing that makes read lower on a hot run.

I posted various dynos in a thread a while back discussing this same thing showing various 3rd and 4th gear pulls on various cars I've owned and they all posted the same numbers regardless of gear.

vioilio

Now I'm confused. So what would be the proper way to do the dyno pull. 3rd or 4th. Again the car was not cold and i drove it to there about 25 miles.

Yacht Master

4th= 1:1 least loss in fourth gear, but this can overspeed some dynos.
Your numbers are normal 380-420 is normal on a stock E55
Next pull, put the car on dyno over night, and try a run on a cool engine in the morning.
I don't think anything is wrong with your car, other than heatsoak.

GT-ER

Unless the dyno has some bad *** fans and do a cool run, then 3rd. If not you'll get fuel dump due to IAT's.

BlkE55K

Except he's not stock. I don't know what's in a K8 package though.

skratch77

you can log your intake temps with a scan tool that plugs into the port under the steering wheel near the handle to open the hood.

Gtr i made like 50 more ftlbs of torque dynoing in 4th gear and yeah it losses top end because its a long dyno pull but on a dynojet its cake for our cars since its no big load on the car.

I would not run 4th on a loading dyno since that run strains the heck out of the car and takes like a min to do a full pull.

ahmad0658

I don't think the biggest problem here is 3rd or 4th gear. The problem is the tune itself, he is running super rich and he needs to re tune the car (go back to the tuner he did the tune recently, could be Brabus) and show them the dyno graph and they will know what is wrong.

I encourage you to email them (brabus or whoever tuned your car) the graph + excel file of AFR vs rpm vs time vs HP vs TQ

skratch77

so you think because of this dyno its the tunes fault?

what if the car has junk plugs/wires and is knocking and the ecu is pulling timing and dumping fuel.

what if the car has a dead supercharger pump and the intake temps are in the 180 during the pull and the car is dumping fuel?

ahhh send the ecu to a new tuner to get better numbers without finding out if the car has an issue is always the best things to do.

so you would ask a tuner to lean it out and add timing to make more power before going over your car

vioilio

The car does have the evosport plugs and wires. It runs great with no hesitation at all. there are no check engine lights of any sort. power delivery is smoth.

GT-ER

I don't know why you made so much more torque. My car put down pretty much the same torque. Maybe you syarted lower in the rpm range? All I know is that I almost fell asleep with how long it took to complete the 4th gear run...lol

Thericker

Agree to disagree... I've had every car I've ever owned either Dyno Tuned or ran Before & After mods etc, when I DIDN'T use true 1:1 gear on Dyno, I saw between 10-20 MORE rwhp across entire curve NOT just peak HP/TQ it makes a difference.
There are further differences when using a "Load Bearing" Dyno VS "Inertia" Dyno...

skratch77

you can buy an obd2 scanner that can show live data and use that to look at your intake air temps.

Once you tell us those temps we can rule out if your supercharger pump is dead or not.

Having a basic scan tool that can do some live data is a must for cars like ours.