Terminator2

That would be an epic dynocom fail from the looks of that graph. When they had the dynocom I used set up like that my car showed a graph just like that except it did not fall off that hard up top.

Stamina

Incorrectly loaded dyno?

RyRidesMotox

That thing made nothing til 4k pm, weird.

Terminator2

That is another reason I think it was a dynocom calibration screw up.

Terminator2

Yep or incorrectly calibarted software to interpret the dyno's results. This happened me one time. The dynocom spit out 520 ft lbs at 4700 RPMs and 440 whp at 5700 RPMs LOL. They had to fix fix something in the calibration. It made 393 wrtq at 3600 RPMs and 363 whp at 5250 RPMs. Still read higher than the dynojet I used at 378 wrtq at 3500 RPMs and 342 whp at 5300 RPMs.

08SSTCRD

What is a dynocom??

Never heard of that, I've used Mustang Dynos and DynoJets though.

Terminator2

Load type dyno kinda like a mustang dyno. They can read anywhere from the same as a dynojet to up to 10% higher depending on operator error.

BYT*SS*TURBO

iTrader: (6)

Any of the load dyno's can be skewed to read eitherway really. This is why I like to street tune cars first then dyno. If the AFR or trims are way off, the load is way off. Another tell tale sign is the IAT or EGT (if you have a real EGT gauge) and sometimes the ECT will even rise way up.

Stamina

In layman's terms: He's talking about loading the dyno in such a fashion as to simulate road conditions with the car, which is important with cars that have turbos, because proper engine/dyno load is what helps spool and keep spooled.

A smaller roller means less rotational inertia, which means that small changes can affect the roller and be picked up by the dyno computer. A larger roller means more rotational inertia, which is better for helping cars with big turbos build boost as they would when off the dyno.

bphage

An easy way to think of it is how sensitive is the dyno. So a roller with less weight takes less effort to change its speed making it more sensitive to subtle changes in power; a roller with more weight or takes more effort so will be less sensitive to small changes in power.

So sensitivity is how little of a fluctuation that can be detected by the dyno; they are making the argument that they can get superior tuning because they can see changes in engine response that others can not.

ATLsilverSS

iTrader: (4)

no freggin crap


can you say....RETUNE

FF_ace

Put a breather filter on it

tglems

iTrader: (3)

I was just gonna do a breather. To be honest my line is still just dangling until I can find a small enough breather to fit as when I checked autozone they were all too big. I have to admit it's a little ugly right now but at least it works

1LowLS

your car?Ugly?NEVAR!!!!!!

hunter19707

What about a crack where it connects to the downpipe?

pbass

OK so what kind of dyno has this heavy roller everyone's buzzin' about?

Matt M

Actually, it sounds like he was saying the opposite. He was saying that by having lighter rollers, it is easier for them to change speeds which can show smaller changes in power output from the wheels. While that may be true to some extent, the load would be unrealistic, especially for a turbo car. Either way, the car that was dyno'd in the previous chart needs to be dyno'd somewhere else. I really doubt that he is losing 120whp by the time he hits 6500rpm. Since it looks the same with the stock turbo, at least you can tell it's not the turbo upgrade causing the issue.

tglems

iTrader: (3)

Every K04 has a crack there. No big deal.

09BlueBaltSS

Is the crack in the divider(normal) or on the flange area(not normal)

bphage

Spot on, the lighter it is the more sensitive it is and the argument is that they can tune better as a result... I don't know that the argument holds true or not.

For example: If a normal dyno is only sensitive enough to see +/- 5hp and the lighter roller dyno is able to see +/- 1 hp then is the tuner able to create a better tune? Maybe maybe not... maybe it takes 3 more pulls to program the care to get the benefits and they don't do it... or maybe to get that extra power would take a more aggressive tune that people are not willing to use on a daily driver... or it can simply be a limitation of the computer itself... point is there are a lot of assumptions being made in that argument.

BYT*SS*TURBO

iTrader: (6)

I don't see how you can tune better when it ISN'T simulating what the car will see on the road. I can certainly see how you can fudge numbers in your favor but that won't make the car run better...

bphage

I don't know enough about that dyno, and word has it you know your stuff. So I will only say that it is still possible to design a low inertia roller dyno that has the ability to simulate street load conditions... I don't know if this is the case or not; but all things being equal the argument being made was that they can better see the engine's response with the low inertia dyno.

elecblue06

iTrader: (1)

i thought the 2871 came with a new water line or something?

BYT*SS*TURBO

iTrader: (6)

Looks like a new Banjo Bolt.

elecblue06

iTrader: (1)

ahh i thought it was a whole new line / i couldnt see it on my small netbook screen lol