Official Harrop TVS1740 Supercharger Thread

[DrFerry]

Originally Posted by drwankel

Keep in mind, I am on test pipes, so the main cats are out, only the secondaries remain. Most of the comparisons I've seen between test pipes and a high flow cat x pipe were pretty minimal, but I'm sure you're right, supercharging does change things. Never seen a Harrop test pipes vs high flow cat x pipe before/after dyno either. Already been talking to a shop as nobody seems to make the x pipe setup I want, so I may go custom:

forward x
high quality high flow cats after the x
high quality resonators
OEM catback connection.

The OEM secondaries are still fairly restrictive in a boosted application. It means you still have ponies trying to escape. The secondary cats need to be at least <= 200 cells per square inch [CPSI] in order to reduce back pressure. I found a good stainless steel X-Pipe I've been very happy with years ago, and the company (M3 World) is owned by a forum member DaveDee

The price listed is AU$. 1$US = $1.45AU. Also AU is a free trade zone with the USA, so no import taxes, or sales tax levied. Here's the link:
https://m3world.com.au/shop/exhaust-...catsresonator/
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[drwankel]

Originally Posted by DrFerry

The OEM secondaries are still fairly restrictive in a boosted application. It means you still have ponies trying to escape. The secondary cats need to be at least <= 200 cells per square inch [CPSI] in order to reduce back pressure. I found a good stainless steel X-Pipe I've been very happy with years ago, and the company (M3 World) is owned by a forum member DaveDee

The price listed is AU$. 1$US = $1.45AU. Also AU is a free trade zone with the USA, so no import taxes, or sales tax levied. Here's the link:
https://m3world.com.au/shop/exhaust-...catsresonator/
.

Interesting option. Do you happen to know what high flow cats are in that specifically?

This bit was interesting from the description:

"This is the most streetable and is more suited to daily driving without producing a significantly higher volume than an OE X pipe fitted with track pipes"

Close to what I am after, don't really want any more volume than I have now which is plenty IMHO, especially after watching it get dynoed. Wish it had the forward X, but its a tough ask.

[DrFerry]

Originally Posted by drwankel

Interesting option. Do you happen to know what high flow cats are in that specifically?

This bit was interesting from the description:

"This is the most streetable and is more suited to daily driving without producing a significantly higher volume than an OE X pipe fitted with track pipes"

Close to what I am after, don't really want any more volume than I have now which is plenty IMHO, especially after watching it get dynoed. Wish it had the forward X, but its a tough ask.

Yes, = 200 CPSI. I use it with the OEM back box. I posted some soundcloud links with sound clips somewhere on this thread or elsewhere on the forum. Search keywords soundcloud and Harrop.
Edit: Found the sound clips here: https://www.bimmerpost.com/forums/sh...php?p=27279570
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[BPMSport]

If anyone is looking for the setup above, let us know. we've probably done about 100 tunes for DaveDee's customers over in AU. He is one of the OG Harrop owners but now has an M240. Its a very nice setup and we will probably put one on our recently acquired E92.

[nycplumber]

Originally Posted by drwankel

Hit the dyno today. 458RWHP was the best run on a dynojet. Torque seems lower than I would have expected as well. Seems there is still some power hiding somewhere. Exhaust setup is the factory x pipe with test pipes, and a corsa rear. Tune is the 91 octane BPM harrop tune.

I suppose my next step will be to get a boost gauge on there to ensure I don't have any leaks.

Test pipes or not thats really low. Difference between test pipes and a catless BW x pipe is less than 20whp which would still put you well under 500 for a catless set up. Not good

[DaveDee]

Originally Posted by BPMSport

If anyone is looking for the setup above, let us know. we've probably done about 100 tunes for DaveDee's customers over in AU. He is one of the OG Harrop owners but now has an M240. It's a very nice setup and we will probably put one on our recently acquired E92.

Thanks Mike
That X pipe was designed initially for your E9x tuning file and later tested with the Harrop SC. Results always brought smiles

I think your DCT tune is essential for the Harrop kit, the X pipe certainly helps but often the forgotten plug change (and coil pack check) can make a significant difference

[drwankel]

Originally Posted by nycplumber

Test pipes or not thats really low. Difference between test pipes and a catless BW x pipe is less than 20whp which would still put you well under 500 for a catless set up. Not good

I agree here. I have no doubt that a proper x pipe will yield some more HP, but I doubt its going to make up 40HP vs test pipes even on a supercharged car. But hey- we can answer this question with data now that I have a baseline dyno.
None the less, it's been a back burner item for a while that I know I eventually want to tackle. Maybe this is the kick in the ass I need to get it done after that valvetronic x pipe ordeal.

First order of business is to get a boost gauge connected and verify I don't have a boost leak. Check the small stuff first.

[DaveDee]

Originally Posted by drwankel

Interesting option. Do you happen to know what high flow cats are in that specifically?

This bit was interesting from the description:

"This is the most streetable and is more suited to daily driving without producing a significantly higher volume than an OE X pipe fitted with track pipes"

Close to what I am after, don't really want any more volume than I have now which is plenty IMHO, especially after watching it get dynoed. Wish it had the forward X, but its a tough ask.

I should read these posts more often, but for what it's worth a belated reply.
The X pipe uses magnaflow 200 CPSI High flow cats, the resonators are designed to compensate for the removal of the 400 CPSI front cats and have internal designs to reduce drone and actually drones less than the OE X pipe
It's much quieter cruising but quite a bit louder and aggressive under throttle. The setup was originally designed around 10 years ago for post members here but over the years quite a few have shipped to The US. It's still popular and is still made here locally by a friend who has his own custom exhaust shop. He specialises in header design and builds for hot rods and other custom cars. Quality is good and I'm always happy to organise these through the forum or Mike Benvo. BTW the first testing was done bringing the X further forward but it actually resulted in poorer performance which came as a surprise. The upside is it allows the kit to ship in 3 parts with the current setup. This significantly. reduces shipping costs.

[drwankel]

Originally Posted by DaveDee

I should read these posts more often, but for what it’s worth a belated reply.
The X pipe uses magnaflow 200 CPSI High flow cats, the resonators are designed to compensate for the removal of the 400 CPSI front cats and have internal designs to reduce drone and actually drones less than the OE X pipe
It's much quieter cruising but quite a bit louder and aggressive under throttle. The setup was originally designed around 10 years ago for post members here but over the years quite a few have shipped to The US. It’s still popular and is still made here locally by a friend who has his own custom exhaust shop who specialises in header design and build for hot rods and other custom cars. Quality is good and I’m always happy to organise these through the forum or Mike Benvo. BTW the first testing was done brining the X further forward but it actually resulted in poorer performance which came as a surprise and it allows the kit to ship in 3 parts with the current setup

This is really great information. Interesting that the forward x resulted in worse performance.

When you say its quite a bit louder under throttle do you mean compared to an uncut factory x pipe, or compared to test pipes?

[DaveDee]

Originally Posted by drwankel

This is really great information. Interesting that the forward x resulted in worse performance.

When you say its quite a bit louder under throttle do you mean compared to an uncut factory x pipe, or compared to test pipes?

The volume is quieter than the factory X pipe with deleted front cats cruising but louder under throttle
The factory X has quite a few crush bends and the mid 200 CPSI cats are not exactly high flow but the factory X has very small resonators and don’t do much.
This is why quite a bit of time went into getting the resonators right as they are larger and just fit without causing clearance issues where the factory resonators are located.

[M3 hacker]

I have the M3 world x-pipe and it’s quality, fitment and sound is awesome - I love it!

Just wish I had the money for a Harrop s/c - maybe one day…

[BP709]

Originally Posted by drwankel

Hit the dyno today. 458RWHP was the best run on a dynojet. Torque seems lower than I would have expected as well. Seems there is still some power hiding somewhere. Exhaust setup is the factory x pipe with test pipes, and a corsa rear. Tune is the 91 octane BPM harrop tune.

I suppose my next step will be to get a boost gauge on there to ensure I don't have any leaks.

What were the ambient temps in the dyno room? I had mine on a dyno jet a couple weeks ago here in Houston and it was pretty damn hot with iat in the mid to high 120's. It put down 465whp 369tq. Excuse the trash all over the graph from the dyno operator doing a pull through the gears.
[IMG][/IMG]

[drwankel]

Originally Posted by BP709

What were the ambient temps in the dyno room? I had mine on a dyno jet a couple weeks ago here in Houston and it was pretty damn hot with iat in the mid to high 120's. It put down 465whp 369tq. Excuse the trash all over the graph from the dyno operator doing a pull through the gears.
[IMG][/IMG]

About 58 degrees. Lovely Seattle in June....

Oddly enough- you only put down 7 more HP, but almost 30 lb/ft of torque more. The torque level I got was something else that seemed abnormally low compared to other dynos I've seen.

[pskills]

Hi all, I recently had the Harrop supercharger installed and have had nothing but set backs. Thankfully none of them were due directly to the supercharger. After having the Harrop installed I proceeded with the 500 mile break In period due to the fact I also had the Rod bearings replaced. During that 500 mile beak in my car started throwing codes. Unfortunately one of my throttle actuators was bad even though I replaced both of them 3 years ago. I also was getting some type of crazy vibration during warm restarts. Never on cold starts but once the car was warm there was this weird vibration that lasted for about 3-4 seconds on restarts. I took the car in to get the throttle actuator issue resolved. But that crazy vibration was still there. I noticed it was getting more pronounced and when I would turn on the ac it would rear its ugly head. Once it became an every day occurrence I took it back to Rouge engineering for analysis. The trouble up until then was so sporadic they were unable to identify but this time the mechanic was able to experience the vibration and noticed it was caused by the deterioration of my cooling fan. So I ordered a new one and can't wait to get my baby back with all of the Demons exercised. I will keep you all posted now that I can finally drive her with hopefully no more issues.

[LTY1224]

While looking for boost leak, I noticed some interesting bypass valve behaviors.

It seems like my bypass valve would actuate to different positions(small difference but noticeable) depends on speed of my input.

And it got stuck at half opening position in my second clip. I've never seen that before.

[DrFerry]

Originally Posted by LTY1224

While looking for boost leak, I noticed some interesting bypass valve behaviors.

It seems like my bypass valve would actuate to different positions(small difference but noticeable) depends on speed of my input.

And it got stuck at half opening position in my second clip. I've never seen that before.

Thanks for sharing. I've not seen that before either. It seems that the valve in the plenum is binding and not allowing the actuator arm to return to its home position in the second video. Some lube in the form of silicon spray applied (sprayed) up around the valve in the plenum may help. It's all I can think of right now.

The small difference seen in the first video with reference to the vertical line could be from the momentum of the sudden movement of the actuator arm due to rapid WOT vs. slow. The arm itself is adjustable (see small threads on the arm) but in this case calibrating the actuator is probably needed. See post regarding actuator calibration made earlier in this thread.

Good luck. Keep us updated. Good find Sherlock.. Nice vids too.

[CamasM3e93]

Originally Posted by LTY1224

While looking for boost leak, I noticed some interesting bypass valve behaviors.

It seems like my bypass valve would actuate to different positions(small difference but noticeable) depends on speed of my input.

And it got stuck at half opening position in my second clip. I've never seen that before.

I think you've found it, or part of it. My valve actuates smoothly and silently. You've got something binding there

[DRLane]

Originally Posted by CamasM3e93

I think you've found it, or part of it. My valve actuates smoothly and silently. You've got something binding there

How are you actuating this?

[CamasM3e93]

Originally Posted by DRLane

How are you actuating this?

Ignition on with engine off. Press on accelerator

[BPMSport]

To the 5 that have been waiting patiently for their kit for the last couple months, they should be arriving any day now! Unfortunately a DHL mix up caused three to be delivered to one customer in Colorado, but we had those picked back up by UPS and sent to their proper new home.

There are a few people on the wait list for end of year delivery. We have an allotment of approx ten kits. We will be reaching out to each of you for a deposit to secure your kit. Those looking to acquire a kit in 2022, please reach out to us. The next batch after this will likely be 2nd quarter 2023.

Thanks!

[tbuck]

Originally Posted by BPMSport

To the 5 that have been waiting patiently for their kit for the last couple months, they should be arriving any day now! Unfortunately a DHL mix up caused three to be delivered to one customer in Colorado....

WOW, he must have thought it was his lucky day!!

[DrFerry]

Originally Posted by tbuck

WOW, he must have thought it was his lucky day!!

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