DSE ACR Extreme Aero Splitter and Diffuser Extensions

**Simms** · 12-11-2016

Awesome stuff! If I get my extreme, I'm in as well.

**Gary Javo** · 12-11-2016

I would be in for testing the extreme extreme pieces. I have some pretty good baseline data at my home track that we can compare it to.

**docwviper** · 12-12-2016

Can't wait to get mine. Just make it perfect. We have till summer

**q8blueviper** · 12-13-2016

what a great job , nice work !

**SSGNRDZ_28** · 12-13-2016

Originally Posted by Gary Javo

I would be in for testing the extreme extreme pieces. I have some pretty good baseline data at my home track that we can compare it to.

Gary, sounds good. I'll be looking for warm climate test candidates in Jan-Feb who aren't hibernating for the winter.

Doug

**One Viper Bite** · 12-13-2016

Super excited about the non-ACR diffuser retro-fit! So in if I get back into a Gen V!

**SSGNRDZ_28** · 12-14-2016

Here are some renderings of the DSE extended splitter getting ready for production in addition to the OEM reproduction. Hopefully track testing will verify a forward balance shift and allow less understeer and more use of the rear wing. Contact me if you'll be on track this winter, have experienced understeer, and would like to test this extension.

DSE Extended vs. OEM (blue)
DSE ACR E Extended Splitter.jpg

3D
DSE ACR E Extended Splitter 3D_SM.jpg

**docwviper** · 12-14-2016

Wait a second, I thought that this was going to be an OEM replica? I didn't realize that this was different then the OEM piece in terms of size and length? I was one of the first to place an order when you had that deal going. Just want to verify its the OEM size and not the extended splitter that's being discussed here.

Originally Posted by SSGNRDZ_28

Here are some renderings of the DSE extended splitter getting ready for production. Hopefully track testing will verify a forward balance shift and allow less understeer and more use of the rear wing. Contact me if you'll be on track this winter, have experienced understeer, and would like to test this extension.

DSE Extended vs. OEM (blue)
DSE ACR E Extended Splitter.jpg

3D
DSE ACR E Extended Splitter 3D_SM.jpg

**SSGNRDZ_28** · 12-14-2016

Originally Posted by docwviper

Wait a second, I thought that this was going to be an OEM replica? I didn't realize that this was different then the OEM piece in terms of size and length? I was one of the first to place an order when you had that deal going. Just want to verify its the OEM size and not the extended splitter that's being discussed here.

Yes there are OEM replicas going into production (you have on order), but this is an additional product which I will have people test. Right now I plan to make a few for that purpose only. If they work these will be an option as well.

Thanks
Doug

**SSGNRDZ_28** · 12-14-2016

My take on the splitter strake support brackets. In billet aluminum... perhaps with a tow hook option?

This will complete hardware the kit allowing any ACR owner to add the ACR extreme splitter if desired. Any Viper already has the bolt/nut installed. As desired they could add these for either for splitter retrofit (would require other parts) or a tow hook that is out of the airflow of the grille.

Strake Support Bracket.jpg

**supertanch** · 12-15-2016

Would like to check if there's also any progress on the street version of the ACR-E rub stripe?

**SSGNRDZ_28** · 12-15-2016

Originally Posted by supertanch

Would like to check if there's also any progress on the street version of the ACR-E rub stripe?

Yep, scanned and being prepared to quote so I can finalize pricing.

Same on the Gen IV ACR items.

**SSGNRDZ_28** · 12-20-2016

I am now offering full 316 stainless steel (matte black) bolt kits for the diffuser and splitter extensions. These will be available in early January and can be ordered now on my website.

We are in the home stretch of production on the extensions, I am hopeful they will all ship the first or second week of January.

Doug

**SSGNRDZ_28** · 01-05-2017

For those who have placed your orders these extensions, struts, and bolts will be shipping next week.

Here are the installation instructions for the adjustable splitter strut:

http://nebula.wsimg.com/91d014bab9bd...&alloworigin=1

I will also have 2 extended splitters ready to go for testing purposes if there are any voulenteers.

Thanks!
Doug

**SSGNRDZ_28** · 01-10-2017

Now in stock, I will begin shipping these tomorrow. The extended version splitter is on the right.

IMG_0496.jpg

**Scott_in_fl** · 01-27-2017

All great looking stuff. Nice work.

The idea of an "extreme Extreme" is terrific. Remember that FCA needed to get the cars street legal and also knew that many would never see the track. Anyway, regarding the rear diffuser, I snapped these pics of the Ford GT race car at the Nascar finale in Homestead a couple of months ago. The rear diffuser caught my attention because of the distance that it extends back away from the car.

Obviously, something this extreme is unworkable but for a true track/race car. But, something a bit shorter (i.e. maybe ending flush with a plumb line off the back of the rear bumper cover) should not be out of the question.

In fact, I could see something like what I'm describing as perfect for the non-ACR's too if you make a retrofit kit of some sort. There seems to be a bunch of demand for that.

I guess my point is that if you're going to make a diffuser kit, I suggest making it as wild as you can (keeping in mind clearance on slopes, etc.). It really is an eye catching part on all of the current Lambos, Fcars, Pcars, etc. as they seem to be getting more extreme on their diffusers as well (bringing F1 aero ideas to even their street cars that have no use for it).

20161119_152905.jpg 20161119_152929.jpg

**SSGNRDZ_28** · 01-27-2017

Thank you Scott_in_FL

I probaly won't go as extreme as the Ford GT shown but hope to have updates soon on those diffusers. It would be more than a pure bolt on because the extensions do not have a top once they extend past the diffuser on the car.

In the meantime...

Splitter Support Bracket test fit.... (lighter than OEM and will allow tow hook attachment)

IMG_0554.jpg IMG_0557.jpg

Extended splitter test fit (track testing next month)

DSE ACR E Extended Splitter Test Fit.jpg

**stradman** · 01-27-2017

Can I ask Doug why is the front edge of these splitters cut just straight? Surely from an aerodynamic point of view they should be bevelled or curved, no?

**SSGNRDZ_28** · 01-27-2017

Originally Posted by stradman

Can I ask Doug why is the front edge of these splitters cut just straight? Surely from an aerodynamic point of view they should be bevelled or curved, no?

It would cost a lot more, it would require a secondary machining process, but it isn't absolutely necessary.

A splitter isn't an airfoil profile (like a wing) so it doesn't matter as much, especially being only 1/2" thick. The main purpose is to generate downforce by allowing air to push on it and also to prevent air from going under the car, which generates lift.

A a wing generates downforce by air flowing over it and the difference in pressure top to bottom because of the speed of the air passing over the airfoil shape. Sort of different principals.

**stradman** · 01-27-2017

Originally Posted by SSGNRDZ_28

It would cost a lot more, it would require a secondary machining process, but it isn't absolutely necessary.

A splitter isn't an airfoil profile (like a wing) so it doesn't matter as much, especially being only 1/2" thick. The main purpose is to generate downforce by allowing air to push on it and also to prevent air from going under the car, which generates lift.

A a wing generates downforce by air flowing over it and the difference in pressure top to bottom because of the speed of the air passing over the airfoil shape. Sort of different principals.

Ok Doug thanks for that. Can I also ask, what is the basis of the extended length of the splitter and diffusers in terms of the amount you have extended them by? i.e. why say 5 cm more or 6 or 7 and not 3? Just want to understand the thinking on the the amount of extension...

**SSGNRDZ_28** · 01-27-2017

Originally Posted by stradman

Ok Doug thanks for that. Can I also ask, what is the basis of the extended length of the splitter and diffusers in terms of the amount you have extended them by? i.e. why say 5 cm more or 6 or 7 and not 3? Just want to understand the thinking on the the amount of extension...

Splitter is 2", testing will determine if it is effective or not.

Diffuser strakes are extended about 3" at the top (to the rear of the plastic diffuser on the car) and tapered down slightly at the bottom to flow better with the side profile lines of the car.

**stradman** · 01-27-2017

So was it just a guess to make it 2" more? Its clear of course you do not own a personal windtunnel so I can understand that you wouldn't have tested it, but was wondering if you based it on something else that's all...Its just that aero adjustments I have heard are very tricky and one needs to be aware of where the thoughts are coming from...

**SSGNRDZ_28** · 01-27-2017

Originally Posted by stradman

So was it just a guess to make it 2" more? Its clear of course you do not own a personal windtunnel so I can understand that you wouldn't have tested it, but was wondering if you based it on something else that's all...Its just that aero adjustments I have heard are very tricky and one needs to be aware of where the thoughts are coming from...

Correct, just an educated guess. If the splitter does not produce the desired results on track it will not be for sale. In addition, if it does work, I would only recommend it to those who have experienced higher speed understeer and have tried to dial that out via other means. It is not a mod that is really intended for everyone, more an experiment at this stage based on some track feedback I've heard. The track / car / mods driving style / setup / etc. may vary handling balances. I have a theory that H&C cars might be the ones that experience more understeer at certain tracks but that isn't conclusive.