924Board.org

Dealer did write back and confirmed the fitment is correct for part # PCG109623 - but I forgot to ask if that covers one valve or one motor! It's listed as a "set" - have written back to try ...

In the tuned n/a engine I put valvesprings from the group buy 10-15 years ago.

That sounds about the right timeline for the ones I have...

So I heard back from Dema (Dmitri) Elgin late yesterday; he confirmed what we might think, that for his cam we'd want to stick with the stock springs (though get new) and probably shim them up to 90-1 ...

Interesting; I measured a rate of 333 lbs/in on my fresher set of stock springs... lower seat pressure, but could address that with shims...

Another post to tie in Mike J's posts...
https://www.924board.org/viewtopic.php?t=45261

Note that he's referencing a closed pressure target of around 110-120 lbs for a race motor vs. stock around ...

As noted, I had to add some shims to get the same free height with the aftermarket springs I tested; difference was about 0.100".

To accomplish this, I was able to find a very nice set of shim ...

OK, here's what I've found... first the raw data, please check my work as I've not done this before, could easily have screwed this up.

Units are US/Imperial: inches lift and pounds of force.

Ne ...

Measured three different 924 valve springs last night; still have to hash out the numbers and will post back with a summary.

The three springs tested were old stock springs (used, unknown miles on ...

Just talked to Hayes; car is going well, driver has much to learn but the lessons are going well!

Race this afternoon is 3:45 EST; timing and scoring, video, and announcing can all be found online ...

Oh, that would look nicer in the 931... doh.

Good luck! Wish we could be there too, we'll be watching live...

www.scca.com

The important part is what lead wire on the cap it's pointing to, and where on the distributor body. Which is what the picture you shared references also.

Firewall location is incidental.

Also.. ...

Pretty weak that the controller doesn't detect the failed sensor and throw a fault, just keeps showing a garbage number you can misuse. That's the sign of bad SW design. So maybe what we're hearing he ...

Re-cal is definitely a wise place to start.

I've been using the Innovate sensors, have 'em in 3 of my cars now, quite happy.

Yeah, +1 to Wiseco pistons too, have those in the race motor in my other (non-924) racecar, working great, and very pretty besides!

I would not bother even putting in pistons lower than 9.0:1 in a ...