hey everyone. on wednesday i dynoed my z for the first time and i was a bit disappointed with the results. my max. rwhp was 299.49. my torque did a crazy spike at the end at supposedly my max. torque is 582.28 (don't worry, i know that's not true). besides that crazy spike at the end, it appears my max. torque is around 310.

i seriously thought i would dyno higher with the mods i have. should i have dynoed higher? this was on a dynojet. the place i took it to specializes in supra's, 300z's, and import motorcycles. do you think there was a problem in the dynojet's setup?

my mods: slp lid, ftra, tb coolant by-pass, hpp3, k&n, slp 85mm maf, slp loudmouth.

 

Don't forget that the A4 robs more HP than the M6.

 

Do you have the Hypertech "Power Tuning" option selected, or are you running the stock program? Last summer I ran with it selected "on" and I found there was a slight SOTP power gain, but some guys have claimed that they actually lose HP (dyno proven apparently? ) when they dyno with the HPP3 "power tuning" selected on.

Other than that, while your numbers may be lower than some, they're not out of line, and especially for having an automatic. If you figure they rob at least ~15% engine power, then:

299.49 RWHP / (1 - .15) = 352.34 flywheel HP .

Now let's say the auto robs a little more, maybe ~18%, then:

299.49 / .82 = 365.23 HP .

That's probably very realistic, and knowing that the lid, MAF and exhaust are your primary power-adders, then an additional 15 flywheel HP over stock is probably about right. While you maybe don't have a "freak" car, I don't think that things are far off. Also, it could be that the dyno is calibrated a little different too?

 

on the very top of my printout it says: run conditions: 75.10 degrees F, 29.76 in-Hg, SAE: 0.99

and on the side it says: CF: SAE smoothing:4

i also noticed that on the bottom of the graph, it gives me the speed in mph. aren't the dyno charts supposed to have the rpm's on the bottom?

again, this was my first time dynoing my car so i don't know if any of this makes a difference.

one more thing, in an A4 what gear should the car be in when doing a dyno run?

thanks for all the help!

 

Your numbers are fine. 300rwhp with an A4 and your only power adding mods (at least that'll show up on a dyno) are a lid and a catback...that's not bad at all, IMO.


Pete, I could be wrong (has been the case once or twice ) but I would mutiply, not divide...like:

299.49 x 1.18 = 353.39


What you put to the ground is all that counts anyway.

 

Most dynos show RPMs (everyone I've seen has) but I guess some don't.

You want to dyno with a 1:1 ratio (tranny). In an A4, that'd be 3rd gear.

 

you know i thought that it had to be in 3rd gear. he said he was doing the runs in overdrive. i asked him to do one in drive "D" and when he did it he said that it didn't have a fourth gear and that it had to go through all the gears.

it just didn't seem like he ever did a dyno run on a camaro. while he was setting up, he was on the phone talking to someone like he was trying to figure something out about the camaro.

i think i'll feel better if i dynoed again somewhere else. if i get the same results then oh well.

 

AFAIK, the run should definitely be done in 3rd (drive) for the A4, or 4th for an M6. Those are the 1:1 gears.

Aaron, you don't multiply 299 X 1.18. When you talk about "drivetrain loss", 15% (or whatever the factor is) is lost from the original ~350 engine horsepower. So 299.49 / .85 = 352.34, which is the same as saying 352.34 X .85 = 299.49 .

 

Even being an A4 I would have expected you to dyno 310 RWHP. I'm gonna say your just a tad on the low side. But you should get the car dynoed again sometime and make sure it's done in third. You might be a little stronger then the first dyno reported.

Good Luck

 

That does suund a bit low for an 01 with those mods, my A4 did 322 RWHP with just the lid and LM and !TB. I agree with a second try and make sure it stays in 3rd. Did you only get one pull? I did 3, I got 312, 317, then 322. I have LT's and a Y pipe on now, getting teady to try again!

Ed

 

Well, I'll throw my $0.02 in here ...

I had a 2001 A4 Z28 with 2.73 rear. Bone stock, it laid down 284 RWHP. Talk about a downer. After the Hypertech tuning, it laid down 298.

 

Hey RicoZG don't worry about the dyno numbers...for one you have an automatic trans. LS1s with A4s generally dyno lower then the M6s. Also...you have 3.73 gears according to your sig. when you install lower gears(higher numerically)you lose RWHP on the dyno. Use the car's mph at the drag strip to judge it's power.

 

my 99 with just a borla catback dyno'ed 285 hood closed 295 hood up.

 

How does one loose HP on the dyno with 3.73's?

 

I don't know the particulars but lower gears(higher numerically)decrease the RWHP numbers. Hopefully someone that actually knows the reasoning can help us out!