Guess what....

[CrosscheckFreak]

Woo Hoo! Just picked it up. Also got some Kooks headers and Corsa (sport) Exhaust. The dyno numbers don't seem right though...just barely over 400 on HP and Torque at the rear wheels. Does that make sense? I definitely feel a big difference. I don't have the exact numbers on me because the sheet is in my car (which I left at the shop when I picked up the SSR). I'll post them later.

I'm goin' to play...

[RSSRTOY]

Put In Your Order For Tires

[FlashBack]

With the magnuson it sounds at least 50 hp/tq low. Have you measured the boost psi?

[2005SSR6Speed]

Each dyno is different. Did you get a before dyno done on your SSR?

[CrosscheckFreak]

Originally Posted by 2005SSR6Speed

Each dyno is different. Did you get a before dyno done on your SSR?

I kinda figured that might be the case, because I do feel a difference. I asked them to do a before, but they must have forgotten and I didn't bust their balls about it.

I'm happy with the performance. Maybe in Springfield someone with a Magnuson can take it for a spin and see if it's performing like it's supposed to.

Here's the Dyno from ECS.

[FlashBack]

[quote=CrosscheckFreak;254224]I kinda figured that might be the case, because I do feel a difference.

"I do feel a difference" doesn't ring right. It sounds like something someone would say after the put on a K&N air filter or a new muffler. The difference you feel should be more like holy ---t, this thing flys. So I have to wonder if all is right on your set up. The difference should be spectacular.

[poppa]

Originally Posted by CrosscheckFreak

Woo Hoo! Just picked it up. Also got some Kooks headers and Corsa (sport) Exhaust. The dyno numbers don't seem right though...just barely over 400 on HP and Torque at the rear wheels. Does that make sense? I definitely feel a big difference. I don't have the exact numbers on me because the sheet is in my car (which I left at the shop when I picked up the SSR). I'll post them later.

I'm goin' to play...

Steve
Your install looks great very clean, every thing looks very well done. I do agree with others here that the results should take your breath away. But you may have a higher scream threshold than most. At any rate, Good luck it really looks beautiful. I want a ride during the fall bridge tour :^)
Dan

[CrosscheckFreak]

Originally Posted by poppa

I want a ride during the fall bridge tour :^)
Dan

You sir, are more than welcome to a ride! If you're up for it....we can swap for a bit.

[WOW_FCTR]

You may have to tweak your tune.....

[CrosscheckFreak]

I guess the only way I'll know for sure is if someone who knows the difference takes it for a spin...or if I take one that's running right for a spin. Poppa may be right...My scream threshold might be higher than others. Although, I was giggling like a school girl when I punched it and heard that Corsa exhaust.

It's also possible that I was expecting more than what's realistic. I'm new to this performance stuff...just learning as I go.

Don't get me wrong...I'm happy with the performance, but If I can get more out of it...I'll take it.

Thanks everyone, for your input!

[CrosscheckFreak]

I just got back from ECS because I had to have the exhaust fixed (the passenger side pipe was hanging off...Ack!..all better now). Anyway....I told them I wasn't entirely happy with the power I was getting with the Magnuson. This is what I was told:

Because I got the powertrain warranty from Magnuson, the tune I was given was just the stock Magnuson tune. They said they can get a great deal more out of it if they do a custom tune (just to clarify...no numbers were specified...just 'great deal more'). They offered to do it, but It would void my warranty.

I have no problem voiding my warranty if it's going to make that much difference. But, does that sound like why my numbers could be so low? Could the tune be that much of a difference (from the numbers on my dyno to what I should be getting)?

As always, all input is greatly appreciated!

[FlashBack]

Yes, it's true that a custom tune will get you more power, But I think your dyno numbers are low even for the stock Magnason tune.
The Magnuson powertrain warrantee has so many restrictions that it's hardly worth the paper it's on(sorry) If you read it you will see what I mean. I't comes from an insurance co, not from magnuson. I returned mine for full credit, and so have a few other guys.
Before you get the tune, consider the corvette throttle body, and a 2.9 or 2.8 pulley change and a more slip resistant belt. Fairly inexpensive mods. There are lots of posts on these items.

[WOW_FCTR]

Flashback is right...if you changed your exhaust, you've already voided your Magnuson warranty. If you paid for an extended warranty, get a refund.

[big-daddy]

A stock LS2 turns about 300 RWHP, so you'ved added 100 to that. I'm told the gain with the addition of headers is smaller than one would normally expect as the stock manifolds flow pretty good. The custom tune would likely add around 20 more.

my .02

[FlashBack]

Originally Posted by big-daddy

A stock LS2 turns about 300 RWHP, so you'ved added 100 to that. I'm told the gain with the addition of headers is smaller than one would normally expect as the stock manifolds flow pretty good. The custom tune would likely add around 20 more.

my .02

I have been under the impression that the LS2 is more like 340+ rwhp. At least the dynos I have seen. Also at an advertise engine HP of 400, you would talking about a full 25% drive train loss to come upwith only 300.

[big-daddy]

I've only seen one that was done at the DynoMaxx power tour on a dyno, bone stock 06 ssr pulling 303RWHP. I'm sure someone here has baselined one under more controlled conditions.

[SSuRveyor]

Okay, I normally just let this stuff go, but since it is MY SSR being dissed, I'll have to join the conversation.

My 2006 Blue 6-speed was dyno'ed at the Dynomax competition on March 16, 2007, along with Alex05SSR and Big Daddy. We had a South East SSR meet that day at the Summit Retail Store in McDonough, GA. Lotsa fun.

My bone-stock SSR pulled a max power of 353.38 hp and 369.13 ft-lb torque.

This on a Dynojet 248-C portable chassis, with an ambient temperature of 54 deg. F.
SAE smoothing was "5". Taking this printout with a grain of salt, I mailed a copy to JimG for his analysis. Long story short is he gave the test his blessing. Hoorah! Now I can be quite proud of my LS2. I would scan this printout and post for all to see, but I am currently on a host wi-fi.

400hp or so after your above mentioned changes does sound a little weak. I would definitely do the tune.

Big Daddy is a gentleman and all around good guy. I'm sure he just meant to put in a 5 instead on an 0.

SSuRveyor

[FlashBack]

Ah, finally a voice of direct experience and reason. thank you SSuRveyor. Your HP shows a drive train loss of about 13% from our engine HP of 400. Pretty much as expected. Also if you check out Lingenfelter or Callaway information you will see dynos of around 480 Hp for a dyno tuned supercharged LS2. and thus their claimed engine HP of 560. Our own vendor and friend 2005SSR6Speed shows about 470 whp
on his SSR. That is with his own tune and possibly a corvette throttle body and 3.8 pulley, I'm not sure. The numbers reported at the beginning of this thread do seem a bit low, but as has been stated earlier, different dynos and different testing techniques can pull some widely variable results.

[ZsSSR]

One small note to this thread:

CrossCheckFreak's truck did very well (vs other supercharged SSRs) at the track here in Springfield. It was his wife Nancy's first time driving the truck since it was supercharged and I think her first time at the track. Either way, she posted at least second best of all SSRs, maybe even first (to my recollection, she or Broomer had the best time) All the time slip numbers (I don't have them) will probably be posted when everyone gets home.

[CrosscheckFreak]

Originally Posted by ZsSSR

One small note to this thread:

CrossCheckFreak's truck did very well (vs other supercharged SSRs) at the track here in Springfield. It was his wife Nancy's first time driving the truck since it was supercharged and I think her first time at the track. Either way, she posted at least second best of all SSRs, maybe even first (to my recollection, she or Broomer had the best time) All the time slip numbers (I don't have them) will probably be posted when everyone gets home.

I talked to Broomer....he said his best was 13.58. We bow to Broomer as the Springfield champ!

Nancy's was 13.60 @103. She did have a run where her 1000 ft time was just under .3 better than her 13.60 run, but she let up too soon not realizing where the finish was and ended up with a 13.68 @89. So I guess the performance issues were all in my head.

[JimGnitecki]

CrosscheckFreak: It's pretty inexcusable and un profressional for your dyno shop to NOT have done the before and after runs, after you asked them to. I'd have been pretty pissed.

As others have already pointed out, dyno calibrations seem to vary more greatly than dyno companies and dyno operatrs are comfortable with admitting.

All is not lost though.

Any dyno shop has to run a LARGE number of dyno tests each week in order to pay for the costs of keeping a dyno in the facility. Your dyno sho[p undoubtedly has a massive library of previosuly-dynoed cars and trucks. We can get a decent feel for this specific dyno's calibration by looking at 2 or 3 dyno runs on completely UNmodified, factory stock vehicles.

The models that are easiest to compare to other dyno calibrations include:

- any STOCK Corvette
- any STOCK Mustang

Since your dyno shop screwed up by not running the before and after runs for you, they owe you. If you can get them to give you the RAW "Win Pep" files for 2 or 3 other STOCK Corvettes or Mustangs, and then you email those to me, ALONG with the raw file for YOUR SSR, I can open them up and figure out their relative calibration (I have the same software they use).

In the meantime, don't be alarmed or disocuraged about the apaprent results. My own supercharged and otherwise modded 04 SSR showed "only" 418 rwhp or so on a local dyno, but that was more than a stock Corvette LS7 dynoed immediately after my SSR.

I also didn't notice, or maybe you did not say, but what gearing are you running? A supercharged SSR with 4.10 or 4.56 gearing will show lower results on an inertia dyno like your shop uses (I can tell that they use a Dynojet dyno from the software they used), since the entire run takes only about 4 seconds, so the inertia of the entire drivetrain is being accelerated artificially quickly versus street reality.

Jim G

[2005SSR6Speed]

If need be he could always go to another local dyno and have his run again. The do comparative data with the that dyno as discussed by Jim ab