Chassis stiffening - clarifications please, chassis stiffening questions Options

[TAV]

Hi everyone

I'me very new to the 914 world. I've bought myself a 914 that I have yet to get back to Australia. It has no engine, but I do have a rebuilt 3.0 from a 911sc that will I'll be using for this project.

It'll be a weekend car and 2-3 track days (solo) per month.

I've done a fair bit of reading into the chassis stiffening options, but some of the threads/resources date back to early 2000's so not sure if there's been any advances in this?

From my reading the options seem to be:
1) cage - of various designs and contact points
2) longitudinals:
a) inner - eg Mad dog and I note Engman has been mentioned, but can't find a site for Engman
b) outer - restoration design and Brad Mayeur
3) GT chassis stiffening kits
4) Tangerine "rear pickup points reinforcing kit"

Am I missing anything?

During my reading, some people mentioned that the GT kit was ineffective, but I wasn't sure whether this was in relation to the all "GT" list or to one particular GT kit
Can anyone clarify this for me, please?

The Tangerine kit (to me) seems like a strengthening kit, but I wasn't sure if this also offered and increase in torsional rigidity?

I'm aiming to stiffen the chassis as much as I can for my purposes s mentioned above, whilst avoiding unnecessary weight increase.

Thanks in advance

[Rand]

There has been a ton of discussion over all of this since the forum started. My takeaways...

Don't cage a street car

INNER long reinforcement is more effective than outer, so the "Engman" kit was the ticket. As Perry said, they are gone now, but look at Maddog to see if his is as good. Inner, not outer.

The GT plates (under/behind the inner rear fenders) are controversial. Added weight, originally done on the fly in the field at the race track, not so much worthwhile as it turns out.

[ClayPerrine]

INNER long reinforcement is more effective than outer, so the "Engman" kit was the ticket. As Perry said, they are gone now, but look at Maddog to see if his is as good. Inner, not outer.

How did you come by this data? Was it just the volume of sales? Or do you have evidence that the Engman kit worked better than the Mayuer kit that goes from the front of the car all the way to the rear suspension pickup?


I have the Mayuer kit on my car. It takes the outer long and puts a top on it so it is like corrugated cardboard. My car is so stiff I can jack it up anywhere on the side and both wheels on that side leave the ground at the same time.

I know the Engman kit is effective, and easier to install. But is it better?

Clay