Harrop twin screw sc for s65

[kitw]

Originally Posted by saxonb

My understanding is that there is a blow off valve operating in the Harrop kit:

One throttle = closed
Off throttle = open

Blow off valves are not boost control.

[DLSJ5]

Originally Posted by Hujan

625 kit making 660 whp? Hmmmm.

Yep, Dynapak's are known to read higher than DJ's, that's my car, and plenty of other cars have used that Dynapak in our area, it does read high IMHO.

Originally Posted by Jonjt

+1

I do believe the VT2 graphs are of crank hp, whereas the Harrop graphs are of wheel HP. I think the VT2 650 kit makes around 570whp, peak.

Nope that is WHP, FWIW my VT2 made ~590whp SAE and 600WHP STD on a well known DJ, "Specialty Z" in our area so they can and do make more than 570, take a look in the dyno data base, plenty there.

[kitw]

Originally Posted by Soorena

It only "bleeds" boost when you go off throttle.
With a single or twin throttle bodies, a positive displacement application is like this: Throttle body(s)=> Supercharger=> Intake ports
In our cars with ITBs it's like this: Supercharger=> Velocity stacks => Intake ports

The wastegate-like valvetronic system in Harrop's design (similar to Audi's) is what that enables us to run a positive supercharger, it releases boost off throttle. Otherwise we would blow the manifold or velocity stacks.

Again, that's not boost control

Audi's sueprcharged 3.0t motor (both the lower power one and the S4 motor) actively bleeds off boost ~4700rpm on up, even with the throttle closed. That's why you can make power with just a tune on those cars.

Do you have a bypass as well, for light throttle applications? Seems that fuel economy would suffer badly without.

[sales@ESSTuning]

Originally Posted by Jonjt

+1

I do believe the VT2 graphs are of crank hp, whereas the Harrop graphs are of wheel HP. I think the VT2 650 kit makes around 570whp, peak.

The VT2-625 dyno is wheel also. It is the same dyno "dynopak" and correction as the other. It was used for comparison I'm sure to show the difference using the same testing method.

[Hujan]

Originally Posted by DLSJ5

Yep, Dynapak's are known to read higher than DJ's, that's my car, and plenty of other cars have used that Dynapak in our area, it does read high IMHO.



Nope that is WHP, FWIW my VT2 made ~590whp SAE and 600WHP STD on a well known DJ, "Specialty Z" in our area so they can and do make more than 570, take a look in the dyno data base, plenty there.

Thanks for that. I always remembered your VT3 kit dynoing in the very high 600s, which is why I was shocked to see a VT2 kit at 660 whp. It always amazes me how much things vary from dyno to dyno.

[DLSJ5]

Originally Posted by Mike Benvo

I think using an unreleased, unofficial dyno chart for comparison is premature to say the least.

So it's okay for you and others to comment on how good the graph looks, but it's not okay to compare it? Especially when others want and have asked and are waiting to see some kind of comparison to the Vortech? If anything it makes it look good in comparison to the same psi, the VT625 is the ONLY dynapak Vortech result we have and my car was running 2.5 psi more that day (8psi), it makes sense and there is nothing wrong with comparing things as long as they are put in the proper context, which I believe RG always tries to do. I think it's fair to point out that Dynapak's to tend to read high as well.

[DLSJ5]

Originally Posted by Hujan

Thanks for that. I always remembered your VT3 kit dynoing in the very high 600s, which is why I was shocked to see a VT2 kit at 660 whp. It always amazes me how much things vary from dyno to dyno.

No problem, I think your skepticism was warranted! Totally agree on the varying #'s from different dyno's as well, the VT3 probably would make 730+ on that Dynapak, lol. The VT3 kit has always been a progression of power, I wanted to take it slowly, now it is up to around 700whp STD, and 690WHP SAE.

[regular guy]

Originally Posted by Mike Benvo

I think using an unreleased, unofficial dyno chart for comparison is premature to say the least.

Define "unreleased, unofficial dyno chart?" I've seen plenty of guys reviewing tunes and new supercharges by saying things like this: "I just flashed the 20th tune from the vendor, and MAN it's so much better..." When I see that, I immediately ask the same question: "does that mean the first 19 tuning files are unreleased, untested, and unofficial? Does this tuner even know what they're doing?" Same thing with these "dev tunes." If they're not released and unofficial, then why are people talking and promoting them? See where that discussion goes?

As for comparing...that's what people do. You already saw the first comments comparing before I even posted the first graph (without comparison). The purpose of the comparison (as stated) was to compare graph shapes, not output. I don't see anything wrong with that. If the vendor didn't want them posted and compared, they shouldn't have made them public. Pretty basic.

[DLSJ5]

Originally Posted by regular guy

Define "unreleased, unofficial dyno chart?" I've seen plenty of guys reviewing tunes and new supercharges by saying things like this: "I just flashed the 20th tune from the vendor, and MAN it's so much better..." When I see that, I immediately ask the same question: "does that mean the first 19 tuning files are unreleased, untested, and unofficial? Does this tuner even know what they're doing?" Same thing with these "dev tunes." If they're not released and unofficial, then why are people talking and promoting them? See where that discussion goes?

As for comparing...that's what people do. You already saw the first comments comparing before I even posted the first graph (without comparison). The purpose of the comparison (as stated) was to compare graph shapes, not output. I don't see anything wrong with that. If the vendor didn't want them posted and compared, they shouldn't have made them public. Pretty basic.

Well said.

[BPMSport]

Don't have the time or energy to debate with you. Looking forward to seeing official charts released by Harrop themselves. This is going to be a killer kit.

[M.Hagen]

Any idea what the blower RPM was?

[Longboarder]

Originally Posted by biglare

You always have the time and energy to stir the pot though!


I and tons of other folks love to see comparisons of different S/C kits, tunes, etc. when dynos are provided for them. There is nothing wrong with this at all IMO.

I'm thinking about getting another M3 and installing this twin screw blower so I can use it to tow my ESS/Vortech blown M3 to the race track.

[Verify]

That twq has to feel great..

still skeptical about finally getting a dyno graph, thats old, with no boost or AFR, and a claimed "only 5.5 Psi"

So ill wait until one of these hits the streets and we get some 3rd party feedback.

I also heard BPM has a vested interest, as he is doing the tuning..

[BPMSport]

Originally Posted by SickeM3

I also heard BPM has a vested interest, as he is doing the tuning..

Not really accurate, but looking forward to the results and putting this bad boy on my M3. I'm not at liberty to discuss any involvement.

[///M Power-Belgium]

Jesus...man !... I realy love the whistling sound of the Harrop in combination with our S65 ,actualy it's the sound of power and makes me think of this ...
The whistling sound of a legend, " The Spitfire " !

[regular guy]

Originally Posted by biglare

Please tell me I'm in a dream.

[BPMSport]

They are doing the tuning in house in Australia as far as I know.

[Verify]

Originally Posted by Mike Benvo

Not really accurate, but looking forward to the results and putting this bad boy on my M3. I'm not at liberty to discuss any involvement.

So you are, otherwise you would not have taken the time to say that your not at liberty to discuss something you have no part of.

Regardless, goodluck, we are all awaiting feedback

[BPMSport]

Originally Posted by SickeM3

So you are, otherwise you would not have taken the time to say that your not at liberty to discuss something you have no part of.

Regardless, goodluck, we are all awaiting feedback

Please don't spread rumors.

[Hujan]

Originally Posted by SickeM3

So you are, otherwise you would not have taken the time to say that your not at liberty to discuss something you have no part of.

Regardless, goodluck, we are all awaiting feedback

I thought you already had the answer? You said as much on the last page. Or were you just talking out of your ass as usual?

[IMG]

Nice,cant wait to see the final tune !

[Nugget]

Originally Posted by Soorena

Otherwise we would blow the manifold or velocity stacks.