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S2 931 EFI Conversion DIY
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kondzi  



Joined: 02 Jul 2018
Posts: 134
Location: MZ/Poland/EU

PostPosted: Wed Sep 02, 2020 1:01 am    Post subject: Reply with quote

I really love these WS coil towers. I've converted almost all of my (classic) cars to these. You'll enjoy that mod as well.
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Konrad
'89 951 US
'88 Mustang 5.0 LX Convertible (factory specs)
'84 911 Carrera 3.2 RoW (factory specs)
'81 931 RoW (TBD)
'81 Ford Capri 2.8i (factory specs)
'79 Ford Capri 2.9 (heavily modded)
'74 Ford Capri 1.3 (factory specs)
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924RACR  



Joined: 29 Jul 2001
Posts: 8353
Location: Royal Oak, MI, USA

PostPosted: Sun Oct 04, 2020 2:28 am    Post subject: Moar BOOST - more tuning Reply with quote

Another round of boost tuning in the cool weather. Have bumped it up to just a hair over 11psi right now; with the cool weather and the IC, WOW is this thing a party! Almost useless levels of power for 2nd gear - not spinning wheels yet, but fast enough to require substantial attention to not earn a ticket in no time flat. Of course, I live in the suburbs, not the sticks, so nowhere to misbehave without being noticed.

That's OK, as the highway is right nearby - and the highway manners of this car have improved immeasurably over stock. Between having a lot more power on tap in the high gears, and no more misfires whatsoever, it's much more comfortable in the 60-80mph range (highway speeds around Metro Detroit).

Of course, it can still throw some pretty good smoke up high - 5kRPM and on. Still needs work there, probably ring condition (turbo was recently rebuilt). Not sure if a lack of break-in miles with higher RPMs, or that the rings are funky and need purging. Switching to Mobil1 will help if there's funk in the ring lands, but it'll screw it up pretty good if it's a ring break-in issue. Running Valvoline VR1 20/50 at the moment, since it's perfect in the racecar. Probably will switch by the end of Oct.

Gotta take a video of some highway pulls, too, one of these days. Lots of entrance ramps for doing so legally...
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Vaughan Scott
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'79 924 #77 ITB racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype
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Fasteddie313  



Joined: 29 Sep 2013
Posts: 2079
Location: MI

PostPosted: Sun Oct 04, 2020 4:12 am    Post subject: Reply with quote

Iím not sure how your boost comes on but mine hits like a nitrous button so be careful spooling while youíre in a corner or anywhere really be ready to catch the tail if it breaks loose, especially if itís even just a little wet out..
Not to brag, but Iíve even broken loose in 4th with lsd going completely straight on good pavement after a slight drizzle..

Hold on, you are the racecar driver here not me
Iím sure you know what you are doing..

I found that only adding an intercooler, everything else being stock, was a very noticeable power improvement..
I see that you are up to 11psi now so you have much to look forward to because I think something magic happens at right around 13 where that little bit of extra boost makes a big difference, on a 2664..
13-15 is a very nice place to be imo ime..


Smoke only at high rpm? Idk..
Could check the intake to see if itís coming from the comp side and the progression of plugs and hot side, breather etc..
I like your thought that it just needs more thrashing though..

I too want to log and take video of a couple more pulls while itís cold and before I put it away for the winter..
My heater core leaked so I bypassed it which makes my poor car even less suitable now that is getting cold and wet out.. Defrost would be very nice right about now, heh..

But yeah, Iím gonna thrash it a couple more times as much as sheíll thrash and see what happens..


I also found my 36 tooth saw blade for my jig to drill out a crank pulley for a crank sensor, but Iíd like to get my hands on another dual pulley crank pulley to work on instead of removing mine and putting my car down to do the job..
I like to keep my toys operational the most I can during projects so I can move them around and such.. donít like to have things sitting in not running states if I can help it.. I know too many people with a bunch of projects sitting around and none of them are ready to run..
Right now ALL of my machines run, and I like it that way

I think I like the bolts in the pulley idea so maybe I can shoot the sensor at it from the side instead of from the back.. Or maybe slice it into 36 tabs, and even bend the tabs to whatever angle I want to shoot it from.. Not sure yet, really need to stare at it for a while and think but I have been very busy otherwise and have just been putting a lot of miles on my 931 and not tinkering with it much.. My 931 has been on quite a few long trips out of town and staying out of town with me recently doing work..

Have a job interview Monday for Clean Harbors too so that could make me extremely busy if they make me a good enough offer..
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jazz guy  



Joined: 26 Nov 2002
Posts: 417
Location: Colorado

PostPosted: Sun Oct 04, 2020 5:32 am    Post subject: Reply with quote

Fasteddie313 wrote:
...I think something magic happens at right around 13 where that little bit of extra boost makes a big difference...

That's funny, I've always thought the same around 12psi. The car really seems to come alive and is really fun in 12-16psi range.
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924RACR  



Joined: 29 Jul 2001
Posts: 8353
Location: Royal Oak, MI, USA

PostPosted: Sun Oct 04, 2020 11:44 pm    Post subject: Reply with quote

Augh, you guys are killing me!!! Just a tease!!

OK, OK, drive a bit more, and a little more twist of the knob...

Yeah, this car literally cannot make enough power to truly scare me; am used to running at and beyond the grip limit in RWD cars with well north of 500hp. Not the racecars; the day job, things with blown V8s etc: Corvette, Camaro, and Caddy Vs. Have worked on Corvette since the 2010 C6, first intro to them was the first modern ZR1... for which we (I) developed the PTM racetrack TCS... good fun, still doing it, only the engine's in the right place now.

...and then the ZL1 and 1LE 6th Gen Camaros... ATS-V and CTS-V... this poor little 2L will NEVER come close to matching those, so I long ago gave up trying to get there. Better off buying a C7 GS or Z06, cheaper faster and easier.

Rather, the 931 is giggles and fun for a nice-driving street car. If only it looked as good as it runs... some day...
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Vaughan Scott
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'79 924 #77 ITB racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype
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924RACR  



Joined: 29 Jul 2001
Posts: 8353
Location: Royal Oak, MI, USA

PostPosted: Tue Oct 13, 2020 11:09 pm    Post subject: Commuting!! Reply with quote

First drive to the office today - about 40mi one way. Dark out, about 40F, but lovely and exciting drive. Still waiting for my pulse to come back down - pretty thrilling and also a bit nerve-wracking!

Runs just beautifully, though I'm still fine-honing the tune (honing, not hooning!!!). Did notice my WBO2 is reading a bit different in the ECU than at the gauge, have to adjust that and keep tuning. But it's on the safe side yet, ECU is seeing a leaner mix, so actual will be on the rich side.

Only real problem now is the rings. Still smoking. Hoping I can drive it a lot and make a dent on that, but there is admittedly a very real possibility I have to pull the motor, deglaze, and replace the rings. Just don't have space to pull another car apart...
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Vaughan Scott
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'79 924 #77 ITB racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype
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kondzi  



Joined: 02 Jul 2018
Posts: 134
Location: MZ/Poland/EU

PostPosted: Wed Oct 14, 2020 2:35 am    Post subject: Reply with quote

Glad you don’t have any misfires. A stable programmable ignition is something priceless, I will need to work on my ignition table in my green 931 as well. But winter is just around the corner, so probably next year. And yes, it’s fun to drive these cars, so much different from heavy modern ones.
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Konrad
'89 951 US
'88 Mustang 5.0 LX Convertible (factory specs)
'84 911 Carrera 3.2 RoW (factory specs)
'81 931 RoW (TBD)
'81 Ford Capri 2.8i (factory specs)
'79 Ford Capri 2.9 (heavily modded)
'74 Ford Capri 1.3 (factory specs)
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924RACR  



Joined: 29 Jul 2001
Posts: 8353
Location: Royal Oak, MI, USA

PostPosted: Wed Oct 14, 2020 11:03 pm    Post subject: Reply with quote

Happy to share my ignition table - just don't have pic hosting to share here. FB would be easiest.

Meanwhile - great day of driving yesterday, around town, and more expected today, but the smoking rings just isn't going away; facing two options, give Mobil1 a try (in the thought that the rings are full of crud, instead of improperly sealed), or just suck it up and pull the motor to redo the rings.

Probably gonna have to park it after today, just goes through too much oil...
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Vaughan Scott
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'79 924 #77 ITB racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype
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