54/1451 2GR swap

[Clifton]

Another month, another autocross.

The only change was a reduction of rear camber. 1.9* to 1.5*. After 3 runs, I could still run less. The A052's on the front could use more comparred to what the CR-1's needed but I am maxed out there.

Everything was great until run 3 and 4 was the worst. I spun the car much easier than normal and then it just got worse. My rear was getting looser. The clouds rolled in before time only runs and I wasn't having to drop rear pressure each run but that wasn't it. 

On the way home it didn't feel right. 85 in the fast lane dropped to 80, then a wiggle, then the slow lane and then off the freeway. My left rear toe adjuster lock nut had comer loose. It won't allow more to in, just toe out. I stopped an my sisters that was close.  It was so loose that once jacked up, I could move the wheel toe it to toe out almost an 1". 

First vid is my fast run. The cone stayed in the box and I was 15th fastest out of 142 drivers.   During the afternoon time only runs the car was a hand full and I was 66 fastest of 68 drivers.

Fast run

https://youtu.be/9ye4W0vbCy4?si=0ZiVJw3eDxqTRVgQ


Spin

https://youtu.be/QB2VeMwDLQM?si=ZKLl2jMql-wc06NP

[TurboFource]

 

[Clifton]

Rear toe adjuster washers are upgraded. I was using two SAE washers stacked but found some hardened machine washers that are .187" thick. These will not have any flex. 

If anyone ever wants on car adjustment for some arms, these are easy to make. 1", .065" tube and a pre made 1/2-20 threaded piece.  I welded a flanged bolt to one end and the rod end goes in the other. This attached to the bottom front of my rear upright.

[Clifton]

We had a SCCA weigh/tech day last Saturday. I had my front ARB off as I was making a new, lighter one. It came to 1685lbs.

[Clifton]

I finished the new arb this morning.  1" OD, .065 wall.

Old 7/8" bar was 11lbs 4.4oz, new 1" bar is 4lbs 10.1oz. Even with end links it's a pound lighter than my extra TC bar.

This puts me at 1690lbs.

[BDA]

Nice! 

[TurboFource]

How's it mounted Clifton?

[Clifton]

Same as the stock one. I used thin wall tube with a 1/2-20 bolt welded to the end. It's the same ones I was running with the 7/8" bar except I added aluminum rod ends and jam nuts. To do again, I would run a bent tube arb above. I think you did yours that way.

[TurboFource]

I did, thanx for the pic!

[Clifton]

 Another Lotus guy at the weigh day asked if I was running a lithium battery and said they are 3.5lbs. They use Lithium iron phosphate (Lifep04). Same as I use for my house. I've read all the charge, cycle, longevity, temp v. life data. They easily last 10 years with a full disharge/charge.

On these Anti Gravity brand batteries, if the bms senses a low current draw that is draining the battery, say from being parked for weeks with an alarm or ecu killing it, it shuts off the battery while leaving enough in reserve to start the car. Push the button on top and it turns back on. I killed my first Deka by leaving the key on over night.

I went with an ATX-20. I only did a few test starts and it cranked faster than with my Deka ETX20. They seem expensive but given Lifep04's longevity compared to lead acid, they cost about the same, just lighter. I found one here on sale.
https://biohazardcycles.com/antigravity-atx20-re-start-lithium-battery-atx-20-ytx-20-ag-atx20-rs/

Another 10lbs lighter

[Clifton]

I have been slowly pulling rear camber out trying to get the temps equal. I was down to 1.3* . On Saturday, I had 4 spins in 3 runs. The car was a mess. I stiffened up the new bar and got a clean run but it was hard to drive. That night I put all the rear camber in from my previous best set up put my old front bar on as Monday was the road coarse and 4 tires off, you are done.

It felt good but I was slowly pushing to make sure I didn't have an off. After lunch, I had a warm up, fast run that timing didn't get, next run was a +1 cone (5 seconds) and I got a cylinder 6 misfire that went into limp mode, killing my last run.

This was my fastest non timed, no penalty run. Not the fastest though.

https://youtu.be/qcJAGANDp0s?si=FUZMDS3rGlCIIHQW

[Clifton]

Pic from grid on Sunday, the bad day.

[Clifton]

Tires were hot on my back to back re run. I had a few 1.5+ G so I figured I would add this one too.



https://youtu.be/Jj3UvK7MLrw?si=FYEpxIapxVjNKR-N

[Clifton]

I'm swapping traction control systems from Race Logic to RaceTCS. My lifting of the inner front wheel on tight corner exit turns kills my acceleration until the car is staright enough for the wheel to get up to proper speed. I have to add too much slip to compensate that then is too much slip everywhere else. RaceTCS can be set to use outside wheel speed verses all wheels so it will ignore the airborne, slow wheel. Race Logic was better than no TC but it has been limiting me too much.