Tracking the 914 - Happy New Year!, Turning this into a regular thing... Options

[brant]

these have a 2 inch opening at the forward flange.

[infraredcalvin]

Thanks Brant!!!

[Justinp71]

Ok, back to our regularly scheduled content…

Last drive home on the uhaul trailer, my front spoiler broke off, I’ve been toying with going to a gt front valance and taking off the 5 inch? Rear spoiler from the deck lid.

Overall I’m looking for better top end speed to close the gap to the gt3s in the club. I’m headed to Chuckwalla raceway on the 7th…. Thoughts?

Also going to try no muffler. See if I feel any gains without. Pipes are about 10-12” short of the rear fascia, anyone see any problems with just running open vs getting some trumpets to extend beyond the fascia?

Nice to see this thread revived!

I have not heard of anything outperforming the magnaflow 2in / 2 out muffler. Came recommended from knight racing. I tried Ben's sport muffler for looks and it clearly lost some power, so eventually I put the magnaflow back on. I think it gave me 20hp.

A pic I have handy from a 911. This 3.2 car made 253hp at the wheels and it only had DC40 cams.

I drove a high compression 3.0 car once with dual supertrapps. It was quick but not as fast as I would have thought, I think the supertraps slowed it down. I have heard of straight up mega phones ripping for power though.

[campbellcj]

FWIW I've always run cookie-cutter type megaphones on track and my car seems to do very well with that setup but it was initially jetted/tuned for those. Would be interesting to test (dyno) an x-over open pipe setup like I've seen on some of the 911s.

[infraredcalvin]

Wow, I never felt that unprepared before. Saturday through Wednesday I was supposed to be prepping the car, organizing and packing tools and gear, then pre loading the car onto a trailer borrowed from a friend (first time). Didn’t get to do any of it, had a packed weekend and a list of honey dos before leaving. I took Thursday off in the hopes I could sleep in a bit, hook up the already loaded trailer and head to the track before traffic started.

Well Thursday was a bit of a cluster…. I woke up early to pack and left the house about 7 AM, halfway to the shop I realized I don’t pack my helmet… so back to the house (thankfully my shop is only 15 min away). I stopped to take a breath, checked all my gear once again to make sure I haven’t forgotten anything else.

I got to the shop, cleaned up the megaphones I got from Brant and installed them, started up, idle was ok, I was rich on the muffler, so idle basically got a bit leaner with the megaphones. No time (and nowhere) to test WOT so I loaded the car on the trailer only to realize the big box of hold-downs I had planned to use was nowhere to be found…. The only other car I had access to was my 930, so out she came, to be used as an errand car…

[infraredcalvin]

Finally got on the road around 1:30ish, made it to the track by 5:30. This is a pic from Friday, but it shows Brant’s megaphones on the car…

[Justinp71]

Tracking can be so time consuming, but so much fun! So how did it do?

[stownsen914]

Love the look of the megaphones

[infraredcalvin]

For the most part, car ran well. I started with putting 101 race gas in the tank and ran my first session with an eye on the afr gauge. At wot i kept seeing lean spikes into the 17/18s, after a few laps I brought her in for a main jet change.

46s we’re running 150 main jests, so I bumped up to 170s. I noticed a low rpm bog, but mid to high rpm were right on the 12s. So instead of fussing all day, I left it and ran it.

She ran nice and smooth all day, in the 100+ deg heat on track without a hitch until my 2nd to last session of the day. The low idle bog got worse, it seemed to drift into the low to mid rpm range. I checked fuel pressure and noticed I was only getting 1.5 psi, so I turned it up and got in a solid last few sessions. When I got back to the pits after my last run she was running funny, my fuel pressure was way back up. Adjusted back down to 3.5 and loaded her on the trailer for the ride home.

[infraredcalvin]

[infraredcalvin]

At home I tried to prep for the “pop up headlight” themed C&C at PECLA, so I needed to put the muffler back on and jet back to 150. Got it all done then realized number 3 bowl was flooding. So now I need to figure that mess out…. Ahhh it never ends…

[Justinp71]

Well at least you got the car out, how was the power? Did you ever figure out your low power issue?

Sounds like the carb needs to be cleaned. Or maybe need new fuel filters?

Years ago when I had a very low amount of fuel in the tank I took off the gas tank lid then used a wet/dry vac to suck out all the debri from the gas tank bottom (recommended by a friend). Then installed 3 new filters (pump, engine compartment, carbs). Haven't gotten any plugs in the carbs since. I also went to PMO's about 6-7 years ago. I am probably due for another cleaning though... hope this helps.

[infraredcalvin]

Yes it was fun to get her out, power was better, still not solving my overall power issue. I need to measure compression and check the cam specs, I’m not doing that till my next engine out.

I just changed the filters, but I need to drain and check the tank bladder and foam, I’ll bet I’ve got foam falling apart.

Too many projects and too many hobbies!

[campbellcj]

Can relate - I'm looking at some jetting changes now as well (new exhaust) and also have had plenty of issues with the fuel system & carbs - the tiniest bit of crud, foam, sealant, old gas...

[infraredcalvin]

Credit where credit is due… haven’t driven her for 2 months, she fired right up, so went for a leisurely drive in the canyon…

https://youtu.be/dN5wTdLEDlw


https://www.youtube.com/watch?v=dN5wTdLEDlw

[Justinp71]

Looks like a nice road! Great benefit of being street legal is you can dust off the cob webs before the track!

[Charles Freeborn]

Nice!
I'd love to be able to shake down my track car before all the logistics of hauling it to a track. But, alas, nowhere near legal. Fortunately my coaching positions give me free track time.
Your car sounds great.

[infraredcalvin]

Finally, first track day of the year this week! My friend got a provisional membership at The Thermal Club down past Palm Springs. We have a little vintage group heading out there Wed to run the track for the day Thursday. Finally got some new tires, R888Rs for the old girl. I was burning up 10 year old R888s I’m assuming were cycled out. I’m really curious to feel the difference. Did a quick alignment, wanted to bring the front toe out a hair more, I was previously running almost neutral.

[infraredcalvin]

She’s ready to go!



Locked and loaded!

[BillJ]

Love your trailer! And blackmis an awesome color on these.cars. of course i am biased