Our V6 Miata’s debut: really fast but …. | Project Endurance Race Miata

Glad to hear that the car's first outing went pretty well, all things considered. Looking forward to seeing it compete more in the future.

The wrap photographs so nicely. (Says the editor who needs to be aware of these things. )

How many horsepower is this thing putting down?

Iirc, a 1.8 miata put down a similar lap during this year's or last year's champcar race.  Right around a 1:46.

We put down a 1:48 in a gm 3.5 swapped 2nd gen rx7 with 180rwhp.

I guess what I'm saying is...  I thought it would be faster.  Is there more performance left somewhere?

I assume they're aftermarket halfshafts (probably from DSS via V8R). Interested to hear if it was the inner or outer CV, and if you're using the stock Miata drive flanges or an aftermarket one (and thus which spec of CV it has).

In reply to wvumtnbkr :

IIRC, the Spec Miata lap record is something like a 1:49 at CMP, and probably wasn't set on an 85-degree day. Don't forget we're also running street tires. 

With tuning, we think the car has a 1:42 in it. But we were happy with a 1:45:00 fresh off the trailer after a few years under the knife. 

In reply to Keith Tanner :

Aftermarket DSS halfshafts via V8R. Outer CV, with aftermarket outer flanges. The internal CV spline (connecting halfshaft to CV joint balls) is what stripped. 

In reply to wvumtnbkr :

They did take pole. The track may not have been all that fast at the time.

Tom Suddard said:

In reply to Keith Tanner :

Aftermarket DSS halfshafts via V8R. Outer CV, with aftermarket outer flanges. The internal CV spline (connecting halfshaft to CV joint balls) is what stripped. 

I have had problems with DSS driveshaft lengths being not quite right, which leaves you running on a very small length of spline if they're too short. The spline then strips.

It's possible there's a long and a short halfshaft if the diff is slightly offset, and if you get them backwards you can get this failure as well.

Tom Suddard said:

In reply to wvumtnbkr :

IIRC, the Spec Miata lap record is something like a 1:49 at CMP, and probably wasn't set on an 85-degree day. Don't forget we're also running street tires. 

With tuning, we think the car has a 1:42 in it. But we were happy with a 1:45:00 fresh off the trailer after a few years under the knife. 

He'll yes.  That IS fast.  

Champcar is also on street tires BTW.  So it's fairly apples to apples.  Also, the race is in June usually so temps the same or higher.

A 142 would be smoking on street tires.

Tom Suddard said:

In reply to Keith Tanner :

Aftermarket DSS halfshafts via V8R. Outer CV, with aftermarket outer flanges. The internal CV spline (connecting halfshaft to CV joint balls) is what stripped. 

M300 shafts may solve that issue, but then what's the next weakest link?