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Question Help!!! Which IROC rear Bumper do you suggest?

I need to change my rear bumper because the present has just the wrong look for my car. From back view I like, but from other angles it terrible in my eyes





I just ordered a new muffler GT3-style from Brian (RarlyL8) and plan to buy a IROC or RSR bumper. There are a few on the market from around 300 to 1000 Bucks, depending on brand and construction. I know, one built using the chopper gun is not to compare in price and quality with a hand laminated using good fiber cloth, but are they worth the price difference. I mean, of course for the part itself, but for the application?

Which one do you mounted? Getty, Rennspeed, GT Racing or what

My goals are:

-Good fit
-No brackets for stock mounting and thus a certain firmness
-No cut-outs regarding the GT3 muffler
-Good surface quality regarding painting (no pinholes or bad gel coat)

maybe someone knows one available here in Europe to save shipping costs, but please no FVD, Cargraphic ore similar, they are nuts with their price policy!

Thanks in advance
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Roland

930 Turbo '81 Too many modifications to list
Old 07-29-2010, 11:48 PM
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TRE's
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Old 07-30-2010, 03:35 AM
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DP Motorsports, Germany
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Old 07-30-2010, 05:49 AM
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Quote:
Originally Posted by WERK I View Post
DP Motorsports, Germany
Nice, but 720Euros/940USD are a bit pricey for a bumper don't you think?
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Roland

930 Turbo '81 Too many modifications to list
Old 07-30-2010, 06:10 AM
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Quote:
Originally Posted by Turboo934 View Post
TRE's
TRE is good and Getty is good.

With anything else, quality declines in favor of lightness (GT RACING) and/or cost.

Call Dave at TRE and he might have some kind of clever mounting system like he does with front bumpers...

And yes, the real hand laid fiberglass bumpers are far superior to the heavy horsehair plaster ill-fitting mexican crap that BB sells.
Old 07-30-2010, 10:16 AM
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Roland,
I got mine for GT racing. It needed a little work here and there, but as I had planned on doing some customizing, I didn't care about that. I made my own mounting brackets and glassed them it. It's rock solid. Here's a couple of pics.
Good luck, Keith





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Old 07-30-2010, 10:41 AM
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If any fiberglass body parts are made with matt or choppergun it is easy to sand it thinner with a DA sander and 36 grit sandpaper from the backside and lay up 6 or 8oz fiberglass cloth in sections over it.
Then use a bondo squeegee over the cloth to squeegee out the excess resin pooled up between layers of glass cloth.

Kind of a similar result to vacuum bagging... it makes the layup stronger and lighter because the excess resin is squeezed out and removed

Most hand laid cloth fiberglass layups start with a layer or 2 of lightweight fiberglass matt first because it conforms to curved and angled surfaces really well when wet out with resin and acts as a bonding agent for layers of fiberglass cloth laid over it.

If you are glassing right angled pieces together then a layer of cabosil and resin mixed together as a fillet in the corners will glue the parts together and makes a concave rounded curved surface if you swipe it with a convex curved squeegee for the glass to lay on without air bubbles in the corners when wet out.
Old 07-30-2010, 10:50 AM
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The GT3 tailpipes exit center under the stock bumper, through the valance. It will adjust up and down to exit below the stock valance but that is not the best look. Whatever bumper you choose will look better with a cutout for the twin pipes.
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Old 07-30-2010, 06:32 PM
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GT Racing does make good stuff too, they have some unique front bumpers. They just go lighter on thickness but the quality is about the same.
Old 07-30-2010, 07:31 PM
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Quote:
Originally Posted by RarlyL8 View Post
The GT3 tailpipes exit center under the stock bumper, through the valance. It will adjust up and down to exit below the stock valance but that is not the best look. Whatever bumper you choose will look better with a cutout for the twin pipes.
Brian

I know, but it's easier to cut out and finish than close some cuts before... Ive never seen an IROC with center cuts for GT3 from any brand.
Don't forget, I've got the skills to make it fit, remember that I made a few parts on my own, wing for example

As far as I planned, I wanted to cut out the whole valance area, similar to my present bumper, or maybe like your example shown with stock bumper and only area around pipes cut

Thanks to all so far and feel free to post some more
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930 Turbo '81 Too many modifications to list

Last edited by proffighter; 07-31-2010 at 01:40 AM..
Old 07-31-2010, 01:36 AM
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Quote:
Originally Posted by proffighter View Post
Brian

I know, but it's easier to cut out and finish than close some cuts before... Ive never seen an IROC with center cuts for GT3 from any brand.
Don't forget, I've got the skills to make it fit, remember that I made a few parts on my own, wing for example

As far as I planned, I wanted to cut out the whole valance area, similar to my present bumper, or maybe like your example shown with stock bumper and only area around pipes cut

Thanks to all so far and feel free to post some more
If you use the ruf yellowbird style bumper than you already have slots cut and you can very easily remove them. They don't reach that far to each side however.
Old 07-31-2010, 08:44 AM
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Bumper does not fit!!!

After comparing different offers for my bumper, I bought one at mrs-design in Germany. It's a small company specialized on Fiberglass parts, mainly Porsche. Because I found some good reputations and the contact was nice, I choosed this one, last but not least he was one the fews, how made a bumper without any muffler cuts.
Two weeks later I received the bumper for a reasonable price and it looked very well made. So far, so good...

Because I am in the middle of my EFI conversion, I had no time earlier and so mounting had to wait until this week. I had roll-out and first runs, thus It would be nice to have a bumper then, othterwise the Police here would not like

BUT it's simply useless. For better understanding I traced the contures of my fenders to compare with old and new bumper, so you can see the differences. Car is symmetric within one mm:














Here are the contures compared to the old bumper (Betterbodiesmotorsport), which fitted quitted well:







I mailed the pics to mrs-design too and wait now, what he means about...
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930 Turbo '81 Too many modifications to list
Old 05-10-2011, 12:39 AM
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Please read the whole thread. I want to change from my 965 like bumper to IROC bumper, so the Rarlyl8 part would not fit at all. Comparte the two first pics with an IROC and you will see the huge difference
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930 Turbo '81 Too many modifications to list
Old 05-10-2011, 05:29 AM
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Sorry you asked for suggestions leaving now
Old 05-10-2011, 08:21 AM
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Quote:
Originally Posted by gsmith660 View Post
Sorry you asked for suggestions leaving now
Did I misunderstood something???

You recommended the RarlyL8 valance, what is nice in principle, but as far as I know, it's made for the stock bumper and that's the reason for my reaction. It was not my intention to hurt anyones feelings...

Maybe I should have tell, that the new post was only show the bad fit, nothing more
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Roland

930 Turbo '81 Too many modifications to list

Last edited by proffighter; 05-10-2011 at 10:40 AM..
Old 05-10-2011, 10:37 AM
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I think AIR (American International Racing) has some decent fitting and cost effective body works. Any composite will inherently take some work to fit just right..the AIR stuff in my experience seems to fit up fairly decent to start. $450 range. There online images and examples could be better but here is the link:

AIR IROC:
Photo Album

Getty is the other recommendation but not sure if they have the IROC WB. I believe AIR product is sold by our sponsor. Made in USA! Hope this is helpful.
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Old 05-10-2011, 01:43 PM
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Brian

Thanks for suggestion. I have seen both before along with others from US, the problems are mainly three:

-I want one without cuts for exhaust because of my GT3 style central outlet

-Because of my way to attach (no more tubes/brackets) I prefer twill over mat, further it would be nice if the producer would make some extra layers where I want (under reflector panel to avoid sagging)

-Shipping and taxes are very expensive from US to Switzerland for such a big part, doubles the price easily

Of course I did not expect a fit that need no work, but this should be within a few mm in my opinion, but what I got needs almost centimeters!

The sad thing is, that the bumper was really nice made, exactly what I want, but his mold seems to be crap
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Roland

930 Turbo '81 Too many modifications to list
Old 05-10-2011, 02:50 PM
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Check out rennspeed, good prices and from what I've used thus far quality is well. if you want perfect, bite the bullet and pay for DP, I've never seen a better quality product!
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Old 05-10-2011, 07:48 PM
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Everything has it's downside...

Today I mounted the bumper with tape to get an idea, if I should adapt or throw
away:



long time ago, when I rebuilt the car I decided to lower the engine to decrease the center of gravity and improve handling (theory for some).

However, no I have found a drawback: The RarlyL8 muffler does not fit behind the bumper (not Brian's fault of course), it touches the bumper at the lower inner edge, where the valance beginns...

There are several solutions in my mind for this:

-Cut-off the Valance similar to my old bumper

-Turning the muffler counterclockwise would gain a few mm's but still close (and dislocate the drillings of flange is not a nice job)

-Buy a new bumper. This would probably save the fitting problem too, but it have to be different in measurements: The bumper face side should be extended to the back

I am still unsure, which way to go. Does someone with a IROC bumper can measure his at this point and tell me the brand of his bumper?

Here are two of mine (view is deceptive, no gap when measured)




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930 Turbo '81 Too many modifications to list
Old 05-12-2011, 12:06 PM
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Roland,
More or less I went thru all of the same struggles that you are going thru. Although the muffler that I had before my conversion still fit, I was going for the IROC look and wanted the exhaust to come straight out the back.



I had the same fitment issues with my rear bumber which was purchase from GT racing. From point to point, it lined up perfect, but just like your seeing the contour wasn't the same. I cut and re-glassed it to get it right. Good luck.

Keith
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Old 05-12-2011, 06:36 PM
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