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Second dyno session!

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NickS

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Discussion starter · #1 ·
As some of you may remember after my stage3 install I went to have it dyno'd. The results weren't impressive...243 @ the wheels. Since then I have added a K&N and made sure I had good fuel in the tank. This Saturday was session #2 and I was hoping to get into the 250 WHP range to meet APR's advertised 290HP claims!
After 4 runs the best I got was 246 @ the wheels!
Image
I'm 10-18 HP less than any other stage3 in Houston on 93 octane. WTF?!?
My A/F readings were spot on, my requested vs actual boost was spot on and I had no timing being pulled out. The ambient air temps were in the 40's with HUGE fans blowing COLD air into the air intake and onto the IC. So no heat soak issues to speak of.
So not only am I NOT getting the advertised HP I am at a loss as to why my car is not putting down numbers that better reflect other stage3 guys?!
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BTW...on the same day 2 other stage3 cars ran...one was 258WHP and the other was 265WHP.
 
#4 ·
Re: Second dyno session! (337`drew)

Nick,
The other APR STG 3 guys... Are they running full 3 inch exhaust? Correct me if I'm wrong but it looks like you're running a 2.5 inch seeing as Milltek does not yet make a 3 inch application for our car, right? Could that possibly be the problem, or have you covered that already?
 
#5 ·
Re: Second dyno session! (RonN)

Dude, that really sucks and I fell for you! I would not be happy with 246fwhp if others are getting more and APR is claiming that you should have more hp. HMMM, what type of engine was the other STG3, AWW? Good luck and hopefully you or APR will figure it out. Peace
Image
 
#8 ·
Or simply that you just are on the bottom of the error margin. I know it sucks when you shell out top $$ and get results that are below the advertised gains(I know this too well), but in the end not all cars are equal and not all setups are absolutely equal. I hope that this is not the case for you and you'll be able to pull those advertised numbers.
Hey who knows, maybe at your regular gas station they are conning the costumers and selling 87 and the 93 pump.


[Modified by Reflex5.5, 1:09 PM 1-20-2003]
 
Discussion starter · #9 ·
Re: Second dyno session! (Reflex5.5)

To answer some questions....I think everyone is using a 2.5" exhaust. The one stage3 is using a Milltek too so I do not believe it's the exhaust.
All the pulls were done in 4th gear. One was done in 3rd but I got LESS HP for some reason.
Yes, I'm on the 93 octane program and using Chevron 93. I had Shell 93 in the tank last time and I was getting timing pulled.
As far as what other mods everyone has...I believe that the 2 from Saturday both have a clutch and flywheel setup. One has a stock IC and the other an aftermarket SMIC like I do. Although it's not a Forge. Both also have an LSD...not that, that matters but just listing what they have. Oh yeah...Jorge also has some hard piping from the IC versus I have the Samco. He said he showed 10HP gain with those!
Image
The other is using hte OEM pipes.


[Modified by NickS, 7:43 AM 1-20-2003]
 
#10 ·
Re: Second dyno session! (NickS)

your obviously upset with your HP rating, but didn't you mention you had run in the 12's when you took it to the track? also, was that with slicks? (i would have to assume so, i doubt Pilots are that sticky!)
i would still be upset regardless of what i ran at the track if my HP was far below what it should've been.
 
Discussion starter · #11 ·
Re: Second dyno session! (Mk2Scirocco16v)

quote:[HR][/HR]your obviously upset with your HP rating, but didn't you mention you had run in the 12's when you took it to the track? also, was that with slicks? (i would have to assume so, i doubt Pilots are that sticky!)
i would still be upset regardless of what i ran at the track if my HP was far below what it should've been.[HR][/HR]​
No, I wanted to get into the 12's. I ran a 13.00 with a 109mph trap speed. I didn't have slicks, I had my road racing tires on the front. They are still DOT street tires...just a tad stickier but I was still getting a lot of wheel spin...even with 23psi in them!
That's just it...my 1/4 mile times and trap speeds don't jive with what the dyno is showing. I'm running faster times than any other stage3 in town. Doesn't make sense.
 
#12 ·
Re: Second dyno session! (NickS)

oh, must've read your post wrong, i thought you broke into 12... still though, you should be pleased with those 1/4 mile times since you didn't have slicks.
did you ever consider the dyno being off? i know it sounds like an excuse, but dyno's do have a margin of error. i'd still be a quite upset though... good luck rectifying the situation.
(wish i had the coin to APR-3 my car! then again, i'd probably be scared of it with all that power!)
 
#15 ·
Re: Second dyno session! (NickS)

The driver has a lot to do with 1/4 times and not just HP/TQ. Have you a tried a different dyno? Were u able to compare your chart with the other S3 charts? Did u VAG also in the dyno run? Why don't you do a compression test or a leak down test just to make sure your motor is not the one robbing power.
Mau


[Modified by SilverMG, 6:00 PM 1-20-2003]
 
Discussion starter · #16 ·
Re: Second dyno session! (SilverMG)

quote:[HR][/HR]Have you a tried a different dyno? Were u able to compare your chart with the other S3 charts? Did u VAG also in the dyno run? Why don't you do a compression test or a leak down test just to make sure your motor is not the one robbing power.
[HR][/HR]​
I haven't tried a different dyno. If you check my original post, you'll see what was done, recorded....I haven't done a leakdown test.
 
#17 ·
Re: Second dyno session! (NickS)

I think the 6-speed should be doing pulls in 5th personally. From what I have seen with my own personal experience, the 5th gear is closer in gearing to the 4th in the 5-speed. Your supposed to do the dyno pull in the gear that is closest to a 1:1 ratio. People say doing it in 4th, but isn't 5th closer to the 1:1 ratio in the 6-speed? That is why I was asking what gear you did the pull in above. You are on the low side of the margin, but you trap and run a low 13 with traction. I would try doing some dyno pulls in 5th.
What gear do you other guys that have dynoed the 337 do your pulls in?
 
#19 ·
Re: Second dyno session! (NickS)

4th is 1.15 x 3.88, 5th is 1.17 x 3.10, 4th is closer to 1:1
Dyno compensates for final drive since it records speed in MPH/RPM and Time it takes to do a pull.
The extra shaft in the tranny (more friction), plus large and heavy flywheel/clutch has to have more driveline losses than the 02J double shaft tranny.
 
#20 ·
Re: Second dyno session! (NickS)

I had a similar problem when putting my bike on a dyno (01' 929rr) I had done several mods and expected 140hp readings, however, it was pulling 128hp which is barely higher than a stock bike. Anyway, I was pissed and could not figure out why, after eliminating may theories, it came down to an overfilled crankcrase. too much oil the pan! It could be something you would never guess, it seems like you have checked most of the possiblities. If your bolt ons are all working properly and similar to the other stage III cars, I would check compression as someone else said. blowby or improper valve seating could be it. It could also be a balancing issue, as stated not all motors are created equally! Good luck, hope you get it.
 
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337`drew
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