370z Camber Arms and needed Track Settings

nismo09

If you want to see pictures go to the first page of this thread. They are pictures of the proto II's but the proto III's look identical.

cv129

I was gonna bump this thread last night but decided to stop stalking this for once, glad that there's progress.

Rusty

I see you went from 5deg caster to 7deg caster. Why the big change?

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nismo09

As far as I am concerned we are definitely in the home stretch.

wstar

I don't know enough about the exact numbers (or suspension in general, probably), but my general feeling has been that my car's going to need some more caster as well. Supposedly more caster = more dynamic camber, so that your static, straight-line camber can be a little less aggressive (= better accel/brake performance on straights) and dynamically increases by a greater percentage when you lay into a corner.

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Rusty

More positive caster gives you more hight speed stability. Less positive caster gives you more agility, quicker turn in. In a nut shell.

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nismo09

Disregard the before measurements – we had been doing a lot of testing before we hooked up the alignment machine. We actually could only get 4.3 caster (which was the setup I tested) in the proto II’s. That is one reason SPL wanted to redesign/refine the arms one more time. Now I am up to 7.0 and can go higher if I want to. I am curious to find out if I have any snap over steer issues with this setup. We shall see.

We also could only get -3.5 of camber on the proto II’s (which was a major issue) and now we stopped measuring after -6.0 degrees. I mean, come on, who would run more than that amount of camber? I kept the camber setting at -3.0 since I still have a total stock Nismo suspension system. When I get around to upgrading, I am sure I will move to -3.5 degrees - and add more caster as well.

To answer Rusty’s question, wstar is spot on - I want more caster for turn in and with having more caster it will actually increase my camber on turn in (another reason to leave the initial setup at -3.0). As you know, the faster you get into and out of a corner the faster your lap times are. I just hope the car doesn’t turn into a snap over steer pig like it was with the OEM staggered Advant Sport tire setup.

To answer RN SHRRK – these bad boys are installed and ready to go. Read my earlier post above. I will be tracking them at TWS this weekend. We will be going CW so I should get a really good feel on how they respond. I want to try to get x10 30 minute sessions in but since I will be instructing, that might not be possible. The good news is the weather looks to be great so it should be a dry sticky track. I am stoked.

I truly believe these arms are ready for prime time and I told Sean at SPL that 2 weeks ago but he is waiting on my report back after this weekend to decide if that is true or not.

Don’t kill the messenger here. It is not my decision. Remember, I have been pushing these folks for 3 years to produce these and I am just glad I am the guinea pig testing them. I am just the tester here!!!!! I would like to think I had a part in them finally making them.

Will let you all know next week how it went. I have my fingers crossed.

wstar

This guy would: Crazy Insane VIP car in Japan

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nismo09

Well there is always one crazy Mo Fo out there!!!!!!! lol

wstar

Even going by that rule of thumb, it still seems like more caster would be nice. The car turns in amazingly, but sometimes high-speed braking is slightly squirmy (very minor steering corrections to keep it straight).

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RN SHARK

Are these things done yet?????? Aaagghhhh!!!!!

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nismo09

Alright boys and girls, the proto III’s have been tested and as far as I am concerned they are ready for prime time. They performed even better than expected – maybe waiting for them for 3+ years clouds my judgment – and were wonderful on the track. I got x8 30 minute sessions in this weekend at TWS and actually being able to keep turning into on a corner was a total trip. I definitely had to watch out for the snap-over steer monster - I just was not used to a car being able to turn in fully without using the throttle to rotate the bad boy. It took a couple of sessions to get used to the new setup (and get my head around the new feelings) but once I got the hang of it, the party started – and never stopped. I turned my fastest laps ever. Not too shabby.

I talked to Sean at SPL Parts today and told him they are ready for “Prime Time” in my humble opinion, so anyone who wants a pair needs to contact him. Here is their web link. SPL PRO SUSPENSION | Contact

Do let him know that you heard it from me and he should cut you a break off the retail price. At least I told him too and he said he would.

Thank god this ordeal is over and I get to party with the Nismo on track forever more. Happy days are here again!!!!!

nismo09

I know AK wanted some video of the new camber arms in action so here is the Nismo on track with the new camber arms. It is a long video (warm up lap to fuel starvation – that’s when I usually exit stage left because I can’t perform at top speed anymore) but I made this one first (of the weekend) for my green students father – he was in the car with me on this session for a father’s day gift on Sunday. If you can bare to watch it to the end, you will see/hear my fuel starvation coming through turns 2 – 1 (a big big right hand sweeper). Thank god it happened on the flat portion of the track (which it usually does but usually not this far down the turn) and not on the 8 degree banking (20 feet away). It was all I could do to control the car from snap over steering to the left when the rear end lifted up. If I had been on the bank – well the wall sure as **** could have come into play. Damn Nissan!!!!!

I will tell you this session was run with the temps at 98 degrees (with the humidity, weather bug said it felt like 107 – and trust me it did) and the track was definitely slippery. No excuses just the facts. Dad had a wonderful time. Dad is an old drag strip racer and I showed him what road racing (and why his son loves it) is all about. Glad to be of service. ;-) It was a good time had by all!!!!! It doesn't get any better than this as an instructor.

06.16.13 TWS CW The Nismo Having Fun on Father Day - YouTube

takjak2

I sent them an e-mail and got a reply back almost immediately.

"Sales@SPLParts

5:10 PM (2 minutes ago)

to me
Hi takjak2, the design is finalized, we just have to wait for the machine shop to complete them. Looking at 2-3 months ETA.

Thanks,
Sean Farrah"


2-3 months, just like 2-3 years ago

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Rusty

Just in time for Christmas. My new winter project. Arms and bushings in the front.

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浪人 - 殺し屋
"The Difficult Anytime, The Impossible By Appointment Only"
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