FIA -How fast

[ERA Chas]

Originally Posted by ERA2076

I have a 3.54 rear - not sure how that is going to work - we may need to regear - I am trying to build a bit of a winder, but should end up in the low to mid 400hp.

What is considered a light (ERA) FIA. i.e how much does a well running track FIA weigh? What is the lightest anyone has built?

I think you're good with a 3:54-I did that with a 3:31 and 6200RPM.
I don't know how light they've been built-I can't recall anyone doing an all out track ERA except Don Durner. And that was BB.
I saw Rodameister's car but I don't think it was gutted to any degree.
All the weight in an ERA is the chassis steel-good because it's near the CG. The ERA rear is good for 50 less pounds. The body glass is plenty thick too so that fights the CG a bit.
The real problem is the aero-there is none. The car just kites above 130. That's why I'd lower it big time and run G-7 slicks for the shallow sidewalls.

[ERA2076]

Originally Posted by ERA Chas

The real problem is the aero-there is none. The car just kites above 130. That's why I'd lower it big time and run G-7 slicks for the shallow sidewalls.

On lowering the car. We were working on this when I blew it up. How much can you lower while maintaining suspension geometry? I set the height by sight and then checked the geometry and it was surprisingly close to having the front lower control arms parallel with the ground. This was with Dunlop 235 60. I am pretty sure the Avons are going to have them exactly parallel if we make no other changes because of the increase in the diameter of the tire.

When you lower them do you run the stock suspension and steering components?

How much can you lower without inducing bump steer, running out of shock, etc.? Anythings special to look out for here?

I am not building a race car. I will still run it on the street, but I would like it to handle the best we can get it without re-invent of the the wheel. That said - track performance is of higher priority than street manners. Once I get tired of throwing money down the drain we can de-tune it, bolt the windshield on, put the carpet back in, and take it to Sunday breakfast.

G-7 Slicks - 15" rim? Not familiar.

x-chr

[ERA Chas]

I have only seen FIA's with ERA suspension components-no custom track-only parts.
Since he designed that suspension, Bob is the best one to advise you about lowering and modification. A call might be best.
If you dry-sump it, you can lower it without oil pan fear. Jus sayin'...
Here is the G-7 information. They are actually called 'semi-treaded' tires. I think you can have them shaved into slicks but check with Krauss. These are the hot vintage race tire:
Roger Kraus Racing - Pricing
Click on 'Cobra tires' and a PDF will list the G-7's with price and specs.
I like your plans for the car.