redpriest HPDE journal

[gmx]

Then you have to make sure the trans, propshaft and diff angles are all correct.

[redpriest]

Originally Posted by ///Mobbin

Thought y'all might enjoy this, Steve Dinan discussing dry sumps (starts about 19 minutes in), granted this may be a different setup he is talking about:

https://youtu.be/EoRTlS19w6k?t=1135

That's a lot of gain from parasitic losses :O

One thing I'm worried about then is if the engine is designed for dry sump use with all this extra stuff they've done ... am I ruining its reliability by running it with a wet sump even if only temporarily? Something I'll have to ask.

[redpriest]

New updates to the car incoming:

SSP Performance clutches (hopefully to solve transmission issues)
Carbon fiber v3 driveshaft from MFactory
15k/13k springs (up from 13k and 11k)
HGK Fiberglass doors with carbon window frames w/removable Lexan (10lbs vs 8lbs for carbon fiber)
Bimmerworld Carbon Fiber blanks for headlights (these are unfortunately backordered)
Dry sump install

[redpriest]

I should mention I bought bigjae1976 's carbon replacement oil pan tray/shield. Trying to get the weight down as much as I can haha.

Driveshaft arrived.

[omgzirra_exe]

Originally Posted by redpriest

That's a lot of gain from parasitic losses :O

One thing I'm worried about then is if the engine is designed for dry sump use with all this extra stuff they've done ... am I ruining its reliability by running it with a wet sump even if only temporarily? Something I'll have to ask.

wasnt your engine built by carbahn steven dinan anyways lol

[redpriest]

Originally Posted by omgzirra_exe

wasnt your engine built by carbahn steven dinan anyways lol

Yeah it was lol so I know it must add something now.

[omgzirra_exe]

Originally Posted by redpriest

Yeah it was lol so I know it must add something now.

more money :<

im on the edge of buyign the Schrick 292s... but waiting to see how you like your motor before i dive deeper.

[redpriest]

Getting ready to make the journey to Chuckwalla. We didn't have time to get the dry sump or the doors sorted unfortunately.

The weight savings we achieved though with this pass of upgrades:

V3 Driveshaft weight savings:
- stock 26lbs with Guibo and bolts
- Carbon 1 piece : 16lbs with Guibo and bolts
-10 lbs

Stock undertray 9lbs; bigjae1976 Carbon undertray: 5lbs
- 4 lbs

Removed idrive - 10lbs
- 10 lbs

So another 24 lbs saved, some of it in rotational mass.

SSP clutches are in and they need a 500 mile break in with no full throttle. I'll be sure to respect that.

Brand new set of DHC 305 slicks all around are mounted, I have a set of DHB practice scrubs that I broke in myself. New springs, increased front splitter angle (-2 degrees, from -1.6). Would like to get to -3+ degrees but Zebulon says to sort the spring rate first before attacking the aero. Hopefully this does the trick!

[DRLane]

What’s are the spring rates at? And what are you testing?

[redpriest]

Originally Posted by DRLane

What’s are the spring rates at? And what are you testing?

15k and 13k on rear, true coilovers.

[redpriest]

Happy 100th track day in the E92 M3. What a journey it has been both personally and for the car. This weekend, we went to Chuckwalla with a fresh set of Pirelli DHF 305/645 tires and reliability improvements to the car:

- SSP clutches
- V3 MFactory carbon fiber driveshaft
- 15k/13k springs
- -2.0 degree splitter angle
- bigjae1976 carbon undertray

I haven't been to Chuckwalla in a long time. It's quite a haul for me, being 9 hours of straight shot driving, but in this case, I had to pick up the car first which adds another 3 hours to the trip. I took a 4 day weekend off and I needed it. After arriving late Friday night, the next day we just settled into learning how the car behaved.

Unfortunately or fortunately, Bimmer Challenge is on a Sunday - but it's also a different configuration. I didn't do any homework or look at any one else's fast laps so I was just figuring stuff out on the fly again.

The car felt much better, a lot of the entry understeer is gone thanks to the springs. Upshifts were violent AF and the car had amazing power and traction in every corner. I did 2 sessions on the fresh Pirellis, then swapped to a scrub set. The scrub set is a set of DHB that I had taken off the car in January and actually had been too lazy to take them off the trailer.

The tires were literally sitting there in the rain. They were shaded by trees so don't have much direct sunlight, but I didn't do anything to protect them. They looked really grody too when I went to drive. They felt that way for about two laps as I worked the surface grime out of them. Brake pedal was hard as a rock too for those first two laps. Absolutely no temperature or grip in them.

But after the third lap they were magical again. Hah! They were only a second off the pace of the fresh DHF, but I was also more familiar with the track then too.

Sunday morning comes, and it's cloudy. I'm fresh thanks to the cabin and lots of sleep the night before, so I swap the DHF back on. After one pretty decent session, my heart sinks when I see a frigging metal fastening screw embedded deep into the tire.



Elie got a screwdriver out and we tried to back it out but heard immediate hissing. Crap! Keep in mind this is a 3 heat cycle tire and should last me a good 10 sessions. They also cost $700 a tire. Just great. So we screwed it all the way back in and hoped for the best. Refilled the tire and went out for the 2nd session. There wasn't any time to find a plug kit before the session started.

Since I had set the fastest time of the session, I was able to pregrid first. This is actually a new experience for me, since I have never been able to grid first ever since I moved up from intermediate to advanced. There's always been faster car/drivers. It's been a magical weekend though, and I've literally been first to grid in every session I ran (except for the very first one, and I was second).

I decided I would take it easy and the moment I felt the car get any sort of squirrely I would come in. Every lap I drove I pushed a little harder and started building a longer gap to P2. The car held every lap. After going through some back marker traffic I cleaned it up a little bit and set the best time of the day.

When I came in, the tire pressure was at 14 PSI! Unbelievable. I never felt it the entire time. The sidewall on DHF must be in credibly strong. I'm having the shop dismount and inspect it, and hopefully it's patchable, but man! What a hero.

I decided not to risk it in the 3rd and last timed session for Bimmer Challenge, so I swapped my super grody set of 8+ HC DHB on the front axle. Was a second slower, but so was most every one else. Some people improved but not enough to close the gap. Success!



As an amusing aside, I had forgotten that I had left a zip tie on the front splitter. Amazingly, through the entire day and 3 sessions of many laps, the zip tie didn't move an inch off the splitter. The power of Zebulon aero!



All in all, an amazingly successful weekend.



dogbone is the fastest I know driving our car at Chuckwalla so after the weekend was over I benchmarked my car against his to see where I could improve. I turns out, a lot! Could use a lot more bravery in corners, but the car's power is there. Only a touch slower on the straights which could come down to bravery and later breaking, or power/weight ratio. But only a hair.

Official weight so far, with me in the car and 3/4 tank of 101 fuel. Car is corner balanced with a passenger btw, so pay no heed to the imbalance. So much weight still on the front and I'm hoping that the next round of improvements we make will take that down further.



3439 lbs.

For Vegas, we will be swapping the doors and windows and I'm hoping we can get the dry sump in for more power. I have a fresh set of Pirellis on order, and if needed I'll get another set of Bridgestone RE71RS as a backup.

After seeing Bailey run with no mirrors I might do the same or pick up the Bimmerworld mirrors.

[redpriest]

It's been a while since I updated this!

Since Chuckwalla, we made some fanatical efforts to lose weight. I got rid of the headlights, the windshield wipers and motors, the horn, the mirrors, the doors, the windows.

The HGK kevlar doors were mounted and saved us a ton of weight - the stock door with glass was 68 lbs, even in its "stripped" form - this is missing the leather door card and speaker! The final door weight comes to 10 lbs. 5 lbs from the lexan + carbon fiber window frame. I really like this solution because it lets me mount the lexan window in the door frame for transport to keep the elements and riff-raff out.

The windows are held to the door by 5 bolts that can easily be removed once you get to the track in about 5 minutes.



I have Bimmerworld carbon-fiber headlight blanks on the way but they are on back order for the forseeable future. Well, what we did was baked the lens covers off the headlights and spraypainted them black. Added some gold and blue flake, and voila:



Bimmerworld GT mirrors came in and those got put on, and here's the final result:



We managed to get the weight down to 3110 lbs! This is still with glass for windshield and rear, and stock hood with vent cutouts. Those are targets of opportunity, and we're pursuing them. With me in the car, this comes out to about 3280 lbs, which is 155lbs down from the last time I measured the car. We still have a long ways to go.

Off to Las Vegas we went, and on the first day, I was driving with the DHF scrubs we broke in last time out (the ones that got punctured). Luckily, the patch and plug has held, and I was able to progressively get faster, from 1:50s down to 1:49 at the end of the day, in the high heat and with 8 HC on the rear tires (7 in front).



On day 2, I saw my competition had mounted fresh Hoosier tires for the morning, and I couldn't let them close in on me, so I too mounted the fresh Pirelli DHC tires I had on my tire rack. It was quite a rush trying to get everything situated with the tire changeout, so I got to grid not quite in first position for the first session of the day.

Despite this, I was able to clear the 4-5 people in front of me, including my main competitor in his monster of a 2300 lb E36 S54 swapped car, and secure P1 for the weekend. Coincidentally, a local Vegas time attack group was running their "first annual Vegas cup" and I crashed it, taking the win there as well, 2 for the price of 1!





Here is the winning lap, you can see me chase down and pass Bailey. He is just extraordinarily quick and I could only catch him because of aero and better grip in corners....

[spxxx]

Car is really coming together, the seat time is paying dividends! Looks so aggressive! I'd love to see a Dyno session in current form and another after the dry sump. Feel like Bailey's car, while extremely light, still shouldn't pull that hard unless you're not seeing the full power of the 4.6L setup without the dry sump.

Stoked to see this thing running in anger at Sonoma on Sunday! Trying to make Saturday work but still TBD, currently signed up for T-Hill OnGrid shootout but might sell my spot.

[b4hand]

Loving this build. I need to put mine on a diet

[redpriest]

Originally Posted by spxxx

Car is really coming together, the seat time is paying dividends! Looks so aggressive! I'd love to see a Dyno session in current form and another after the dry sump. Feel like Bailey's car, while extremely light, still shouldn't pull that hard unless you're not seeing the full power of the 4.6L setup without the dry sump.

Stoked to see this thing running in anger at Sonoma on Sunday! Trying to make Saturday work but still TBD, currently signed up for T-Hill OnGrid shootout but might sell my spot.

The other thing I noticed is Bailey is basically brake for turn in, back on full throttle well before the apex - his car basically just stays planted through the turn, it's incredible.

I think we aren't seeing the full power yet of the stroker as well. We just need a good block of time to address it - hopefully soon.

[omgzirra_exe]

Originally Posted by redpriest

The other thing I noticed is Bailey is basically brake for turn in, back on full throttle well before the apex - his car basically just stays planted through the turn, it's incredible.

I think we aren't seeing the full power yet of the stroker as well. We just need a good block of time to address it - hopefully soon.

For what its worth, ive gone thru almost a dozen revisions of my tune before we finally woke the motor up properly.

i suggest getting one done if you haven't!

i also use the bosch green motorsport injectors (from a ess G1 supercharger) and the Rktunes upgraded oem pump.

[okusa]

Originally Posted by omgzirra_exe

Rktunes upgraded oem pump.

What exactly are the benefits of that unit? Is is a simple swap for OEM? Does having a supercharger change anything?

[omgzirra_exe]

Originally Posted by okusa

What exactly are the benefits of that unit? Is is a simple swap for OEM? Does having a supercharger change anything?

i run mainly on E85 and on oem LPFP and injectors im nearly at max duty cycle.

[slcook54]

Originally Posted by redpriest

The other thing I noticed is Bailey is basically brake for turn in, back on full throttle well before the apex - his car basically just stays planted through the turn, it's incredible.

I think we aren't seeing the full power yet of the stroker as well. We just need a good block of time to address it - hopefully soon.

I don't know, it looks like it's absolutely hauling in the acceleration department. It looks like the acceleration on Gabe's car.

[okusa]

Really great build. Excited to see where it goes from here.

[Cmassey3]

.

[leftfootbr8king]

There are a handful of important variables that will dictate what your temps are with different rubber and pads, but if your goal is to eventually push the limits of faster tires a bigger oil cooler is definitely going to help.

There is some anecdotal evidence that certain oils run a little cooler than others as well.