Fit 964 bumper to impact bumper car

[Andy Somogyi]

Hey, has anyone here fit a 964 bumper to an impact bumper car?

How much room is there between the impact bar and the tub?

Is the impact bar pretty tight against the bumper itself?

Amy chance anyone has any pics underneath?






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[rattlsnak]

Doubt there is a way to do this without changing a lot of parts. (like the front latch panel, fenders, etc. they attach completely different..) Most of the 964 style bumpers you see on impact cars are specially made repos to fit those years and not a real 964 bumper.

[Andy Somogyi]

Originally Posted by rattlsnak

Doubt there is a way to do this without changing a lot of parts. (like the front latch panel, fenders, etc. they attach completely different..) Most of the 964 style bumpers you see on impact cars are specially made repos to fit those years and not a real 964 bumper.

It actually fits fine, just have to machine a few custom bumper brackets, and had to fab a support bar under the top of the bumper to attach the smile.


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[Canada Kev]

If you knew all that, why did you ask? Not trying to be a dick, but curious if there was a reason that everyone else might gain some insight from.

[Andy Somogyi]

Originally Posted by Canada Kev

If you knew all that, why did you ask? Not trying to be a dick, but curious if there was a reason that everyone else might gain some insight from.

I knew about the 964 bumper plastic part and how it’s attached, and I knew how to machine the mounting brackets. What I didn’t know about was how much clearance there is between the 964 bumper and tub.

After a lot of googling last few days, and looking at a lot of pics, I think I managed to come up with an estimate that there’s about 2” of clearance between the 964 impact bar and the G series tub.
These pics probably illustrate it the best.

Notice how the impact bar sits relative to the fenders and hood (which are identical on G series and 964). Also, there’s about an inch of clearance between the 964 impact bar, and the raised bumps on the 964 tub. These look about an inch thick, and the g series doesn’t have these. Hence, I’m estimating about 1.5-2 inch clearance, which should be just enough to clear my front center cooler.

Oh, and I already picked up a 964 smile, because I was originally going to go with an IROC bumper. But I didn’t like the looks of that, and decided to go with a modified 964 style. Don’t have the 964 bumper yet, as I wanted to get some measurements to see if it would fit first.





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[rattlsnak]

Like i said, you have to make/change a lot of stuff but how did you attach it underneath? Or did you just let the bottom corners hang free and flap in the wind?

[Andy Somogyi]

Originally Posted by rattlsnak

Like i said, you have to make/change a lot of stuff but how did you attach it underneath? Or did you just let the bottom corners hang free and flap in the wind?

I haven’t picked up one yet, I was trying to determine if it gives enough clearance.

Underneath will get aluminum sheet and molded fiberglass ducting that will create an sealed expansion chamber right behind the bumper and in front of the radiators. This is how a ducted radiator works, in that the high velocity inbound air stream goes into an expansion chamber. This decrease the velocity and increase the static pressure. And it’s this larger static pressure difference across the radiators that drives air flow though them.

Doing this for engineering reasons.

The cool thing I found with the 964 style is that the bottom is already enclosed which saves a lot of work. So need to make underside ducts that connect to these areas.


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[ian c2]

I have a front bumper , Usa style supports , euro/rs supports , and the air-block foam in the garage .
I think also the stock 3-piece underneath pieces , and definately the tech art version .
What dimensions do you need ?

[ian c2]

Bear in mind the 964 street cars had a fan assisted oil cooler in the right side that needed directed airflow .
The fan is attached to the oil cooler , so over a certain speed the assembly hinders cooling .
The track cars got rid of the fan and modified the airflow through the plastics , and later did the same again on the drivers side .
The street cars evolved to have a seperate front cooler added that made up for the loss of area at speed due to the fan assembly .

Depending on what you want to achieve will determine which of the many variations you choose to copy .

Do not think “ porsche did this on a later model with a 3.6 , so it will work for me “ ...