drecpt83

What's "kind of wierd" about it? The op didn't skimp out on his turbo selection the first time and had an issue with the unit. He found an alternative turbo that fits both his budget and needs for his "street car". If he's happy 👍

NicD

iTrader: (7)

I'm sorry you don't understand how this stuff works but to call it bizarre is funny and just because you think it should be the same doesn't make it so. When was the last time this dyno was calibrated? When was the last time the weather station sensors were cleaned out to make sure they were accurate? How do you even know that the settings were the same on this dyno from before to now? You do realize this is a user configurable dyno right? And all of that is ignoring the FACT that the dyno correction factors are not accurate on a boosted vehicle. My reasoning is bizarre? No, it's called real world experience of using multiple types of dynos every day.

Game ova

Ok, I concede.... I have no knowledge of how dynos operate, and you are absolutely correct. The end.

coltboostin

Props for posting up a fair comparison

callys

iTrader: (2)

I tried to read the thread and I don't think I saw it mentioned - is your car a 6 speed? Are you still on the stock rear? ( I think I saw you at least drove it to the track on the stock rear at one point)

Game ova

Thanks

Yes, it's a 6 speed....still on the 10 bolt. And I do drive to the track.

SpraydZ

iTrader: (2)

Thanks for the good comparison and info! Def a better comparison than the critics in here have ever posted.

Krom

My calculator shows 60.9 hp delta uncorrected, and 61.8 corrected.
Also shows that the correction factor is the same until the third place after the decimal point (1.07979 vs 1.07556) The difference in correction factor between the two days is less than 4 hp.

I know you've said that correction factor is useless on turbo cars, but it does show us that the weather was basically identical on the two days.

With the test on the same equipment, in the same weather, it really only leaves the operator purposely falsifying inputs on only one of the runs....

1bdbrd

iTrader: (12)

What I'm curious about is what brand and model of turbo is appropriate for a built ls2 in this case? Meaning his precision was obviously **** and he wanted to replace it with a like sized turbo and the only other one I can think of is the turbonetics 7875. Is that what would the two in here mentioning the on3 not being good enough would use instead?

Game ova

I can assure you that neither I nor the operator played any games with the inputs. I wanted to have everything as close as possible to the pulls with the precision, as to get accurate info. I'm doubtful that any info that you provided to nic d will be of any use.

turbohf

awesome, glad the china turbo is working out for you! i put in my order for a 7875 from VS racing last week. already seen many success stories/dynos, but always nice to see another!

Game ova

Thanks. Regardless as to what all of the nay sayers have to say....it's a solid performer, ESPECIALLY at its price point. Now just need to see how long it lives.

Nali6.2

Ill be curious to see how long it survives as well. a buddy of mine ran ebay turbos on his vw for a while and at low boost setting they would last but when he would crank it they would last a couple hundred miles before they ate themselves. he now runs a precision.

coltboostin

Which you cant do on a Dyno Jet. The only fields you could modify would skew the torque, and it would be very obvious.

NicD

iTrader: (7)

Maybe you should search some of my posts on here and on performancetrucks.net for some good comparisons and info. All I ever post up is helpful information and if you think I'm a critic because I pointed out this comparison is flawed so be it. Remember, I've done this same comparison albeit the other direction on a customer's car and it was done back to back and the precision picked up 100 horse in the exact same conditions in a VERY controlled environment unlike this comparison.

I didn't and wouldn't say that somebody purposefully falsified anything. There are plenty of things that come into play that can skew numbers outside of that like tire pressure, oil temp, coolant temp, etc. I have seen a car dyno 25 horsepower more/less on a regular street tire just because the pressure was different. I've seen slick tire cars change by 50 horsepower with tire pressure. I've watched a turbo car dyno 50 horsepower different from before with no changes just because it was a cold pull vs a warm pull. I'm not implying that somebody played dyno tricks, I'm saying there are A LOT of things that come into play when dynos are done months apart let alone a day apart. The fact that none of that was even monitored means any conclusion that could be drawn from it isn't accurate. I'm used to do comparisons in the most accurate way possible and I see how things skew results one way or another unintentionally.

No offense but did you even look at his graph? Obviously not a dynojet.

Drewstein

I've posted enough 1k rwhp plus dyno graphs that I don't need your approval.

I'm saying it's BS because it's not just 750 but how much less power there is across the band. If it's 750rwhp from 2k to 6500rpm flat then sweet! But it barely peaks there and dives off like it's in the Olympics. I'm saying it's BS because what was claimed is false based on the data. It's a cheaper turbo and produced significantly less power across the board, HP and TQ. Also the trap speeds don't back up the original HP claimed which makes me question the dyno used.

If he's happy with it then cool, just don't try and claim the turbo is something it's definitely not. If the power loss is worth $1k then cool. If not then upgrade. It's that simple.

Game ova

As we can clearly see, the precision stayed flat all the way to the end......oh and BTW, there in the upper rpms....end of the graph, there's little difference in hp...or torque. Not really sure what these so called professionals are looking at, but whatever. Just wanted to provide some data points for people looking to make decent power.....but don't have an unlimited budget. Take it or leave it.

SLOW SEDAN

iTrader: (13)

What's your 1000++ hp car trap? And with what turbo? Just curious to get an idea. Link to the dyno you posted?

Game ova

I have no idea if this guy is telling the truth or not, but don't be surprised if you never see a graph. You're likely to receive more evasive....vague claims as to his many accomplishments. I see it like this.....post up......or shut up. And I'm probably out of line, because this wasn't directed at me....but just needed to say it.

trilkb

iTrader: (4)

Man, lots of talking in here. I just want to say that car is completely badass to me! Job well done. People get lost in the glamour of crazy builds and fail to see a sweet street car here. Awesome ride.