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  Topic: Valve spring upgrades
924RACR

Replies: 18
Views: 1007

PostForum: Performance Upgrades   Posted: Tue Jun 28, 2022 5:12 am   Subject: Valve spring upgrades
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 ...
  Topic: Valve spring upgrades
924RACR

Replies: 18
Views: 1007

PostForum: Performance Upgrades   Posted: Mon Jun 27, 2022 8:17 pm   Subject: Re: Valve spring upgrades

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...
  Topic: Valve spring upgrades
924RACR

Replies: 18
Views: 1007

PostForum: Performance Upgrades   Posted: Sat Jun 25, 2022 8:43 pm   Subject: Valve spring upgrades
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 ...
  Topic: Valve spring upgrades
924RACR

Replies: 18
Views: 1007

PostForum: Performance Upgrades   Posted: Sat Jun 25, 2022 5:52 am   Subject: Valve spring upgrades
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...
  Topic: Valve spring upgrades
924RACR

Replies: 18
Views: 1007

PostForum: Performance Upgrades   Posted: Sat Jun 25, 2022 12:32 am   Subject: Valve spring upgrades
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 ...
  Topic: Valve spring upgrades
924RACR

Replies: 18
Views: 1007

PostForum: Performance Upgrades   Posted: Sat Jun 25, 2022 12:04 am   Subject: valve spring shims for the 924
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 ...
  Topic: Valve spring upgrades
924RACR

Replies: 18
Views: 1007

PostForum: Performance Upgrades   Posted: Sat Jun 25, 2022 12:01 am   Subject: valve spring rates
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 ...
  Topic: Valve spring upgrades
924RACR

Replies: 18
Views: 1007

PostForum: Performance Upgrades   Posted: Fri Jun 24, 2022 8:30 pm   Subject: Now with measurements!
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 ...
  Topic: Headed to Road America this weekend
924RACR

Replies: 4
Views: 283

PostForum: 924 Racing Today   Posted: Sun Jun 19, 2022 2:26 am   Subject: Headed to Road America this weekend
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 ...
  Topic: Wideband air/fuel gauge
924RACR

Replies: 16
Views: 635

PostForum: Performance Upgrades   Posted: Sat Jun 18, 2022 10:25 pm   Subject: Wideband air/fuel gauge
Oh, that would look nicer in the 931... doh.
  Topic: Headed to Road America this weekend
924RACR

Replies: 4
Views: 283

PostForum: 924 Racing Today   Posted: Thu Jun 16, 2022 11:19 pm   Subject: Headed to Road America this weekend
Good luck! Wish we could be there too, we'll be watching live...

www.scca.com
  Topic: Wait...is my distributor backwards??
924RACR

Replies: 2
Views: 396

PostForum: 931 Tech.   Posted: Wed Jun 15, 2022 9:26 pm   Subject: Wait...is my distributor backwards??
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.. ...
  Topic: Wideband air/fuel gauge
924RACR

Replies: 16
Views: 635

PostForum: Performance Upgrades   Posted: Sat Jun 04, 2022 7:46 am   Subject: Wideband air/fuel gauge
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 ...
  Topic: Wideband air/fuel gauge
924RACR

Replies: 16
Views: 635

PostForum: Performance Upgrades   Posted: Fri Jun 03, 2022 8:26 pm   Subject: Wideband air/fuel gauge
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.
  Topic: Engine Rebuild - Need Advice
924RACR

Replies: 8
Views: 597

PostForum: General Discussions   Posted: Tue May 31, 2022 11:14 pm   Subject: Engine Rebuild - Need Advice
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 ...
 
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