jls288gto

I just installed the Glover rear diffuser on my C6, and wanted input before my next event (VIR full course). Think this will cause enough rear downforce to cause a balance issue at speed? I'm concerned about the uphill esses in particular. Any input would be appreciated!

Here is the rear diffuser on the car:

jlutherva

Nice looking diffuser!

Did the vendor do any wind tunnel testing that indicates you are going to improve your rear down force?

My guess would be that you would not even notice any difference, but that's nothing more than a WAG.

Start at the same entry speed and see if you can feel any difference.

Will you be there with TrackDaze this week?

Jim

Rob Willis

Cool. I always kinda wanted one of those. Just didn't think they blended the ends/side of it well enough.

Let me know if it feels any different!

VGLNTE1

how and where does it connect underneath? can air pack up inside of it?

RX-Ben

My understanding is that the center section for the exhaust really prohibits the setup from working well.
I doubt you will feel a difference (or at least nothing like running a wing w/o a splitter)

davidfarmer

I don't think it will make a difference, but worse case it will keep the rear settled as you crest turn 8 (the yump). Understeer is rarely a bad think from a safety/balance standpoint.

andy3101

I run that same diffuser with MTI front splitter and MTI rear spoiler, and zr1 styled side skirts. I can't say I noticed any differance on the track compared to a car I drove with zr1 front splitter and rear spoiler with stock diffuser..

You might want to check all the screws in the diffuser.. I an issue with the screws falling out at the track last weekend. Ended up zip tying the the diffuser to the bracket in on the one side as a band aid..

redtopz

You probably won't notice any difference. I bolted an APR wing on the back of my C5Z which provides a lot of rear downforce and it was noticeable and resulted in decreased lap times (for a couple laps). For example at Thunderhill I went from mid 1:55's with no aero to mid 1:53's with the wing. After a few laps, the front tires started getting hot and the car pushed. More rear down-force will make the car easier to drive and more confidence inspiring, but if you start to push you will have to lift off the gas to get the front end to bite and turn in.

0MTI RACING

I have seen that diffuser up close on a lift. It IS a nice cosmetic look.

Aero is a very, very scientific chain of events. One aero device affects another. You absolutely MUST go to the wind tunnel to verify what works, and why things don't work.

In order for a diffuser be effective, the diffuser airpath needs to start from at least from the middle of the car. Even then, the shape has a huge influence on the airflow path.

For example,
This is a diffuser that we made for our MTI Racing Track Package.
It is hardcore, but it helped us to cut a 1:54 laptime at VIR.
Grassroots Motorsports magazine upcoming Nov issue has a full writeup on the MTI Racing Track Package. It will be released on our website shortly.

RX-Ben

Which wing? No splitter?

redtopz

This one:



No front aero. It was basically a T1 car with a wing. It's not a bad setup for time trials, but no good for racing.

vette6aut0x

Plus 750hp more than likely didn't hurt.

RX-Ben

Is that a GTC-300 or GTC-500? The 5 looks like it has a ton of downforce (vs the Kognition and the Fulcrum), though obviously more drag.

Is another 200hp and full aero really only worth ~3sec @ VIR vs a C6Z with bolt-ons (Todd's car)??

Falcon

FWIW the GTC-500 has 345# downforce at 120 mph with 64# drag.

The 72" Kognition has 423# downforce at 120 mph with 39# drag.

RX-Ben

Thanks for that correction. I prefer the Kognition mounting setup as well. And they have a picture of an awesome corvette, so I am totally sold!!

Are you running a 4" splitter?

Falcon

Mine is ~3", but it's extendable up to 5". But at that extended length, it makes loading and unloading a lot harder because it'll drag.

varkwso

you sure about that