IROC bumper style modifications
 

I'm going be be fitting an IROC bumper to my 76 narrow body car. For technical reasons, I need a pretty big air intake.

But I'm not super keen on how 'pronounced' it looks. I'd like the look of my car to be as early 70's period correct as possible, and have a very factory look. Basically, I’d like a more subtle look than the standard IROC bumpers.

This Gemini Blue 911 I think is just about absolutely perfect, this is the style I love. That classy chrome trim and the clean narrow body lines.

So, anyone here got some ideas on how I can mod the bumper to make it look a bit more subtle?

A few ideas I have are:

(1) shave the outer corners to give it more of a stock look.
(2) round the air intake to give it more of a Singer look.

Notes:

* I already have the bumper, bought a used one off of a 911 SC, I think it’s originally from GT racing.

* I've previously looked at the 911 SC/RS bumper from EB Motorsports, that was a candidate. However I recently picked up a used IROC bumper, so that's what I'm using.

* there are technical reasons why I need an intake, I've calculated the air flow requirements in Autodesk Inventor.

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Check the following. There may be others.

-GT racing
-TRE
-Rennspeed
- MA Shaw

Check what Accumoto has. Mark White has his front nose pieces custom made to his specs to they're tighter to the car more like the looks of an earlier car. Will still have a fairly large cooler opening but more rounded contours. Not sure what is appetite is to sell individual pieces since he mostly builds complete customer cars.
Accumoto.com

Not sure how it would fit with the rest of your project or even how available originals or reproductions are but what about a slant nose spoiler?

https://bringatrailer.com/listing/1987-porsche-911-turbo-33/


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The 80’s style Porsche’s are not my thing. I’m into the early 70’s style. That’s why I’m thinking a few tweaks to the IROC style would fit best.


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I don't think you can modify that lower valence in the areas indicated in orange. My similar lower front spoiler has a 1/2" edge. I am sure this was done for strength and to provide a finish transition.

While opening up the center is possible you will have to get creative with some fiberglass if you choose to take the saw to the lower corners.

Yep, would love to get a copy of their bumper...
https://i.imgur.com/Lskyhur.jpg

I just checked out Accumoto, they’ve got some fantastic styling ideas, I’m totally going to steal some style queues from them.

It looks like the just shortened an IROC bumper, basically tucked the stick out part in.

It’s fiberglass , so it’s easy to deal with. To get that kind of effect, I think you could cut the front face off, trim about 20-30mm and glass it back on.







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That’s the “pink pig”, belongs to a good friend of mine. 100% Accumoto build, very fast car and fun to drive. Also shows the custom wheels- 15x8 front, 15x9 rear.

You might take a look at the Ruf style front bumper as well. It tapers down like you want and it has an oil cooler slot.

Another option would be find a metalworker to graft an IROC-style opening into a non-foglight front valence. Not going to be cheap, but neither is messing with the lines of a fiberglass IROC bumper (at least in terms of time)

I had to chop 3/4" out of the center of an IROC front bumper and stick it back together because it stuck out on the sides. Just doing that and fixing all the manufacturing flaws took me 6-7 hrs.

I originally thought about modifying my existing bumper. I was going to use my English wheel to curve an aluminum sheet for the top of the bumper, and weld that in. And roll a pair of side extensions out of aluminum to get rid of the accordions and weld those in, and metal finish everything.

But then I realized the IROC is pretty close to what I want. So, now what I’m doing is rolling a pair of cro-molly tubes to go behind the IROC bumper and use those as an impact bar, like modern cars so.

I made a few quick autodesk inventor simulations of impact, and the cro-molly tube is stronger than the existing aluminum bumper.

Engineering and fabrication wise, I got this, just trying to get some ideas on the styling elements


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To move the bumper tighter to the car , you may need to section the bumper so the fender lines up -

http://forums.pelicanparts.com/uploa...1549025619.jpg

I ended up cutting mine into several pieces and glassing it back together.

Mike

:D:D:D
Vorhaut on the front lid...:D:D:D
Vorhaut.... means foreskin.

imagine driving round with foreskin on your car..
Pretty awesome:D:D

Just something strategic to consider, the 964 nose allows more air flow room between the tub and the rear surface of the oil cooler than a IROC nose can allow.

he’s not putting in an oil cooler... :)

Actually Accumoto's bumper recognizes the space limitation for a front oil cooler. That's why their oil cooler "box" in the bumper is pushed forward and the bumper area is shortened. You can see the top of the oil cooler box aligns with the bottom of the bumper area. Other IROC bumpers have the box set back a little bit from the bumper

Still, neither the 964 or the IROC or the Ruf gives you all the room you need for good oil cooler airflow. Best thing to do is duct the chassis tub behind the oil cooler to dump it under the car, or into the trunk. If it goes into the trunk, you fabricate even more ducting in there that either dumps it to the sides of the tub into the wheel wells or above the hood

EB Motorsport?https://www.eb-motorsport.co.uk/products.asp?type=14&sub=26

I love trunk lid vents

http://forums.pelicanparts.com/uploa...1549049337.jpg

I’m actually fitting a radiator here. I’ll be cutting a duct behind it that will exit in front of the gas tank down, similar to an RSR duct.



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