XKR Super G... Going for Mach 1
everyone wants to see this bad boy
05-07-2009, 10:59 PM
#424
OK, here are the pics:
A couple of notes:
The quality of the MasterGrades rear diffuser appears very good and it includes the side vortex generators, which is cool. Also, the sides of the center air channel curve out, which should help to provide a nice transition to slow the velocity of the air coming from underneath the vehicles.
The height difference between the center channel and the left and right sides is about 5". To opine as to weather this is adequate would be mere speculation at this point, but it might be.
Also, we definitely will need to add some vanes (probably 2 or 3) to better control the vorticies.
The depth from front to rear measured in the middle of the center portion is 21". As Eric noted, we will need to extend the depth of it so that it extends further under the car. Eric said that this would not be difficult to do.
The next step is to determine whether it would be prudent to modify the center portion of the CS style rear bumper to allow the center portion to tuck up higher under the bumper. This could help to improve performance by allowing a more optimal angle between the rear diffuser and the ground. I'll take the diffuser to my body shop, have them mount the rear bumper and the diffuser, and then take a look at it.
After that, I'll speak with Eric to determine the next step for extending the depth of the diffuser and any other modifications we want to make.
A couple of notes:
The quality of the MasterGrades rear diffuser appears very good and it includes the side vortex generators, which is cool. Also, the sides of the center air channel curve out, which should help to provide a nice transition to slow the velocity of the air coming from underneath the vehicles.
The height difference between the center channel and the left and right sides is about 5". To opine as to weather this is adequate would be mere speculation at this point, but it might be.
Also, we definitely will need to add some vanes (probably 2 or 3) to better control the vorticies.
The depth from front to rear measured in the middle of the center portion is 21". As Eric noted, we will need to extend the depth of it so that it extends further under the car. Eric said that this would not be difficult to do.
The next step is to determine whether it would be prudent to modify the center portion of the CS style rear bumper to allow the center portion to tuck up higher under the bumper. This could help to improve performance by allowing a more optimal angle between the rear diffuser and the ground. I'll take the diffuser to my body shop, have them mount the rear bumper and the diffuser, and then take a look at it.
After that, I'll speak with Eric to determine the next step for extending the depth of the diffuser and any other modifications we want to make.
05-08-2009, 07:09 AM
#430
Update:
I just spoke with my body shop, Wellington Auto Collision. They are going to put on my CS style rear bumper next week (they will try for Monday, but it may slip to later in the week). After they have that on, I'll take the rear diffuser to see whether we will want to make any modifications to the bumper.
I'll snap some pictures. The rear bumper won't be modified or painted yet, but it will give an idea of how it will look.
I want to thank Eric (EricisKlumzyee) for working on this project with us. Even though he was out of the country and not able to respond to us for a couple of weeks, the diffuser shipped out on April 30 and arrived yesterday in good condition.
Mike and I were sweating it, though, Mike probably more so than I.
GreenGoblin, PM me your telephone number. I'll give you a call after the bumper is on to let you know when I am headed over there. It will be nice to get your opinion too on this.
I just spoke with my body shop, Wellington Auto Collision. They are going to put on my CS style rear bumper next week (they will try for Monday, but it may slip to later in the week). After they have that on, I'll take the rear diffuser to see whether we will want to make any modifications to the bumper.
I'll snap some pictures. The rear bumper won't be modified or painted yet, but it will give an idea of how it will look.
I want to thank Eric (EricisKlumzyee) for working on this project with us. Even though he was out of the country and not able to respond to us for a couple of weeks, the diffuser shipped out on April 30 and arrived yesterday in good condition.
Mike and I were sweating it, though, Mike probably more so than I.
GreenGoblin, PM me your telephone number. I'll give you a call after the bumper is on to let you know when I am headed over there. It will be nice to get your opinion too on this.
05-08-2009, 09:59 AM
#432
Rather than extending the main rear diffuser, you could try to identify where the lift points are underneath the car and address those in an ad hoc fashion with strategically placed smaller pieces, similar to the optional aero kits that were available for the early model Gs.
05-08-2009, 11:03 AM
#433
Rather than extending the main rear diffuser, you could try to identify where the lift points are underneath the car and address those in an ad hoc fashion with strategically placed smaller pieces, similar to the optional aero kits that were available for the early model Gs.
05-08-2009, 11:46 AM
#434
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Update:
I just spoke with my body shop, Wellington Auto Collision. They are going to put on my CS style rear bumper next week (they will try for Monday, but it may slip to later in the week). After they have that on, I'll take the rear diffuser to see whether we will want to make any modifications to the bumper.
I'll snap some pictures. The rear bumper won't be modified or painted yet, but it will give an idea of how it will look.
I want to thank Eric (EricisKlumzyee) for working on this project with us. Even though he was out of the country and not able to respond to us for a couple of weeks, the diffuser shipped out on April 30 and arrived yesterday in good condition.
Mike and I were sweating it, though, Mike probably more so than I.
GreenGoblin, PM me your telephone number. I'll give you a call after the bumper is on to let you know when I am headed over there. It will be nice to get your opinion too on this.
I just spoke with my body shop, Wellington Auto Collision. They are going to put on my CS style rear bumper next week (they will try for Monday, but it may slip to later in the week). After they have that on, I'll take the rear diffuser to see whether we will want to make any modifications to the bumper.
I'll snap some pictures. The rear bumper won't be modified or painted yet, but it will give an idea of how it will look.
I want to thank Eric (EricisKlumzyee) for working on this project with us. Even though he was out of the country and not able to respond to us for a couple of weeks, the diffuser shipped out on April 30 and arrived yesterday in good condition.
Mike and I were sweating it, though, Mike probably more so than I.
GreenGoblin, PM me your telephone number. I'll give you a call after the bumper is on to let you know when I am headed over there. It will be nice to get your opinion too on this.
Sweating is not the word I would use
....It would have mess this up for sureWe were planning on adding additional underbody panels, but Mike was concerned about ensuring that the diffuser extends to the bracket that runs across the rear of the G's. That will make a good location to secure the diffuser. We'll see if it extends that far or if there is another suitable way to secure it so that it doesn't flop around when Mike is running at 200+ mph in the Silver State Classic.
Thats the area that I meant to say when I spoke to you.
Last edited by XKR; 05-08-2009 at 11:50 AM.
05-11-2009, 03:26 AM
#437
Here is an actual picture of the MasterGrades TS Style rear diffuser mounted on a car with a stock bumper:
Here is a pic of the diffuser:
Here is an actual picture of the CS Style rear bumper.
Here is a car with the CS Style Rear Bumper:
Here is how I thinking about modifying the CS style rear bumper to work with the diffuser to allow center part of the diffuser to tuck up into the bumper after the bumper is modified.:
IMO, assuming we can make everything fit together properly, the diffuser will look FAR better with the CS Style rear bumper than with the stock bumper.
Wellington Auto Collision is going to try to get my CS Style rear bumper mounted tomorrow. I'll take the diffuser over there and see how well it will work with the bumper and whether we will need to have Eric modify it to extend further under the car.
Here is a pic of the diffuser:
Here is an actual picture of the CS Style rear bumper.
Here is a car with the CS Style Rear Bumper:
Here is how I thinking about modifying the CS style rear bumper to work with the diffuser to allow center part of the diffuser to tuck up into the bumper after the bumper is modified.:
IMO, assuming we can make everything fit together properly, the diffuser will look FAR better with the CS Style rear bumper than with the stock bumper.
Wellington Auto Collision is going to try to get my CS Style rear bumper mounted tomorrow. I'll take the diffuser over there and see how well it will work with the bumper and whether we will need to have Eric modify it to extend further under the car.
Last edited by ttg35fort; 05-11-2009 at 04:24 AM.
05-11-2009, 04:56 AM
#438
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What Exhaust you guys running?
My biggest beef with the Mastergrade TS diffuser is that in their pics the exhaust can is skinnier than what most of us that are Fi are running.
I think I can safely say most of us that are Fi are running the Evo TT exhaust and the can is huge. I questioned Mastergrade on this and their response was "Oh well your just going to have to hack it" instead of offering some kind of spacer or alternative solution.
Hopefully you guys come through with this and the additional parts for the underbelly.
Once everything has been resolved I will definitely be interested in a GB or will contact Eric.
My biggest beef with the Mastergrade TS diffuser is that in their pics the exhaust can is skinnier than what most of us that are Fi are running.
I think I can safely say most of us that are Fi are running the Evo TT exhaust and the can is huge. I questioned Mastergrade on this and their response was "Oh well your just going to have to hack it" instead of offering some kind of spacer or alternative solution.
Hopefully you guys come through with this and the additional parts for the underbelly.
Once everything has been resolved I will definitely be interested in a GB or will contact Eric.
05-11-2009, 05:26 AM
#439
^^^^^^
I also have an Evo TT Exhaust.
XKR has a 3" exhaust, but I don't remember which one.
The canisters on the Greddy Evo TT are offset to tuck up under the car. Below is a picture of mine. I'll measure how far they hang down and how far in toward the center they protrude.
EDIT: My exhaust isn't on right now, but I have taken some measurements from the picture of the underside of my car. I think the Greddy Evo TT canistors may just fit, but it is close.
The diffuser definitely will need to be modified to extend much further under the car. The closest structure to the rear of the car that we can attach to is the GTSpec rear tie brace, and to get to that we need to make sure we clear the rear suspension components.
I'll see what else needs to be modified and get with Eric. I have been studying these pictures. If we extend the diffuser and attach it to the rear tie brace, it will put the diffuser on an angle. That may give us enough clearence to clear the Evo TT mufflers. If not, this setup may be limited to APS or similar sized mufflers. I'll ask Eric if he is interested in making a custom diffuser that will be more universally applicable and which extends to the rear tie brace.
Eric better give me mine for free (or in exchange for the MasterGrade), though, since I already paid for the MasterGrade and I am doing all the engineering on it.
I think he'll be able to sell the **** out of the diffuser once we have the design worked out.
We'll probably need to get a custom rear tie brace made that gives us a linear surface to attach to.
I also have an Evo TT Exhaust.
XKR has a 3" exhaust, but I don't remember which one.
The canisters on the Greddy Evo TT are offset to tuck up under the car. Below is a picture of mine. I'll measure how far they hang down and how far in toward the center they protrude.
EDIT: My exhaust isn't on right now, but I have taken some measurements from the picture of the underside of my car. I think the Greddy Evo TT canistors may just fit, but it is close.
The diffuser definitely will need to be modified to extend much further under the car. The closest structure to the rear of the car that we can attach to is the GTSpec rear tie brace, and to get to that we need to make sure we clear the rear suspension components.
I'll see what else needs to be modified and get with Eric. I have been studying these pictures. If we extend the diffuser and attach it to the rear tie brace, it will put the diffuser on an angle. That may give us enough clearence to clear the Evo TT mufflers. If not, this setup may be limited to APS or similar sized mufflers. I'll ask Eric if he is interested in making a custom diffuser that will be more universally applicable and which extends to the rear tie brace.
Eric better give me mine for free (or in exchange for the MasterGrade), though, since I already paid for the MasterGrade and I am doing all the engineering on it.
I think he'll be able to sell the **** out of the diffuser once we have the design worked out.We'll probably need to get a custom rear tie brace made that gives us a linear surface to attach to.
Last edited by ttg35fort; 05-11-2009 at 08:08 AM.
