Time Trial Build Thread (aero, widebody, any other nonsense)

[truegearhead]

The throw-back IMSA wing is done! I’m super happy with it, the wing blade is off of a 911 Cup car that just happened to be the right length. I still need to cut the center attachment points off

[Quadcammer]

well you certainly win the award for the least conventional 986 ever made. cool stuff.

have you run it at the track yet?

[truegearhead]

Originally Posted by Quadcammer

well you certainly win the award for the least conventional 986 ever made. cool stuff.

have you run it at the track yet?

Not yet…two weeks until the first event. Still a long way to go.

[truegearhead]

Not too much of an update but the car is finally fully assembled, its so good to see it back together. What a LOOONNGG road its been.

[1thenaton1]

BUMP - did you ever get to drive this beast? Report back to your internet fans

[ike84]

How did the tranny handle? You still have the stock 5 speed in place right?

Sent from my 100003562 using Tapatalk

[truegearhead]

Originally Posted by ike84

How did the tranny handle? You still have the stock 5 speed in place right?

Sent from my 100003562 using Tapatalk

Yep still the stock 5 speed. It really didn’t take a beating though, it was 30 degrees out, I was running Hoosiers (which could not warm up) and the diff is open. So it just spun one wheel the whole time.

[Gilles]

Originally Posted by truegearhead

Yep still the stock 5 speed. It really didn’t take a beating though, it was 30 degrees out, I was running Hoosiers (which could not warm up) and the diff is open. So it just spun one wheel the whole time.

Perhaps is time for a OS Giken LSD..?
.

[j.fro]

Christ Stuart that thing is effing amazing!!! Hope to see you at some events later this year.
Rennzenn Jeffro

[truegearhead]

Test and tune round 2, this time at VIR. I was super nervous about driving this car at speed. It has so many unknowns, so many back yard engineering solutions I had no idea what to expect. I found an event that only had less than 15 people at theme (5 or so on track at the same time) so I thought it would be the perfect way to test the car out without running anyone else’s day. I had a few buddies come along as well, which you can see in the 11 second long video below. The car did perfectly with the exception of the clutch which you can hear in the video slipping constantly. Even with the slipping clutch is was able to walk away from my buddies 600hp M4.

Teaser of the Boxster (with heavy slipping clutch) vs M4
https://youtu.be/X_dGEOgq0Q4

[ike84]

Lol, I'm sure you're gonna go through a lot of tires.

Sent from my SM-G970U1 using Tapatalk

[ike84]

Question for you -

What did you end up doing to the fuel system to run e85? I remember you said that you were installing a second pump - can you give details on that? Also, Did you switch out all the fuel lines?

Sent from my SM-G970U1 using Tapatalk

[truegearhead]

Originally Posted by ike84

Question for you -

What did you end up doing to the fuel system to run e85? I remember you said that you were installing a second pump - can you give details on that? Also, Did you switch out all the fuel lines?

Sent from my SM-G970U1 using Tapatalk

The most expensive and complex thing was installing 1,100cc injectors that are required for the amount of fuel you need with e85. The injectors were more expensive than both turbos combined and their size made tuning very challenging since even small changes made big changes in air to fuel ratios. I also have a flex fuel sensor in the gas line that is talking to my stand alone and adjusts A/F, timing, etc for e85 and octane levels, e85 friendly lines and of course a stand alone system that has the fuel and ignition maps.

[ike84]

Originally Posted by truegearhead

The most expensive and complex thing was installing 1,100cc injectors that are required for the amount of fuel you need with e85. The injectors were more expensive than both turbos combined and their size made tuning very challenging since even small changes made big changes in air to fuel ratios. I also have a flex fuel sensor in the gas line that is talking to my stand alone and adjusts A/F, timing, etc for e85 and octane levels, e85 friendly lines and of course a stand alone system that has the fuel and ignition maps.

Thanks for all that info! What did you do with the OEM tank and pump setup? Did you leave them both in place and add a second stage pump to up the pressure? Or did you scrap it all and go with a totally new system?

Sent from my SM-G970U1 using Tapatalk

[truegearhead]

Originally Posted by ike84

Thanks for all that info! What did you do with the OEM tank and pump setup? Did you leave them both in place and add a second stage pump to up the pressure? Or did you scrap it all and go with a totally new system?

Sent from my SM-G970U1 using Tapatalk

I used the OEM pump and tank (I added a second inline pump to get the fuel capacity up). I basically followed what the 996TT guys did. If you want to get fancy there are 996TT E85 conversion kits out there, just make sure you select one with a return line or no return line depending on your setup.

[truegearhead]

To everyone's surprise the car survived Hyperfest last week! I'm shocked, I actually drove it back onto the trailer at the end of the weekend. I admit I had so little faith I even rented a garage at track. Overall the car did really well, but I did have some problems. At a 140mph the roof lifted about 8"s up and forward, fortunately the hinges held and I was able to hold the roof down with my hand until I could into the pits (the flaggers were not impressed with one handed driving but I was allowed back out). The second time out the rear fenders were sucked into the pavement but a few rivets later that was resolved. The only real problem I had was over around 4,800rpm the car would misfire badly at full throttle (anything under that, or just off full throttle it was perfect). I was adjusting the fuel table all day (it was running rich) but I don't think it ended up being a mixture problem. I pulled the plugs and they were perfect, I think the problem may be related to the stock weak coils I have.

[ike84]

Originally Posted by truegearhead

I used the OEM pump and tank (I added a second inline pump to get the fuel capacity up). I basically followed what the 996TT guys did. If you want to get fancy there are 996TT E85 conversion kits out there, just make sure you select one with a return line or no return line depending on your setup.

That's good to know.

I'm thinking about an e85 conversion when I go twin turbo. My plan was to keep the tank, pump and rails but to replace the mild steel lines with e85 compliant an6 tubing, adding a Bosch 044 inline to boost flow, going with 40% larger injectors, and faking nb02 input from a WB so that I can dial in 9.7 for stoich.

It's good to know that everything is running well for you! For the misfires at wot - what are your afr and fuel pressure at that point? Maybe you're leaning out?

Sent from my SM-G970U1 using Tapatalk

[Outkasted]

I envy your skill. I tried to make a fiberglass part last week, turned out horrible and it was a quarter of the size you are doing.

[truegearhead]

So I'll admit I was feeling pretty cocky when I posted that first fiberglasss photo. 10 hours, 2 coats of fiberglass, one coat of bondo, and untold amounts of drywall plaster later I'm feeling back to my normal self. This. ins't. east. Its getting close, but this is only the mold..for the mold, which I'll make the actual fenders out of.



If you're thinking of trying this here are some take-aways I've had.

1) packaging tape is an excellent "realese agent", fiberglass doesn't even think about sticking to it

2) if you're making a mold there is no reason to use bondo, bondo is hard to work with. Quick dry wall spackle is the way to go. The slow drying stuff that everyone is used to can't go on thick or it will crack. The fast dry stuff can go on thick and can be sanded in hours (as apposed to days). It also begins to dry after about 5 minutes which allows you smooth it out like clay. Really neat stuff.

Yes thats right, packaging tape and drywall spackle are my advice. What were you expecting?

[truegearhead]

Still needs top coats and some trimming but I CAN MAKE CARBONFIBER PARTS YOUALL!