Rx7 alignment...calling Peter H.

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boosted
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Rx7 alignment...calling Peter H.

Post by boosted » Sun Feb 17, 2019 10:13 am

Id appreciate your views on these alignment settings pls and any others with indepth understanding of geo.
History.
Car has always handled great and put to the limit on track by me but its always had significant roll..from the back which on occasion has lend to the rear breaking away that is fairly easily caught with some opposite lock.
On the quest for improving laptimes...last year i fitted uprated anti rollbars front and rear Racing Beat and swapped out bc coilover springs from 10fr 8 rr to 12fr to 10 rr...
But alas set up tweak day it was raining and crashed....so moving forward...car has been repaired and went for alignment and nothing on suspension found to be bent.
The settings below are what were put in...by a very competent racer. I think there ok but my car is very loose at the rear now....i chose 22 hard of 30 and driving home i had to pull over and soften to 5 all round as it literally felt like driving a plank of wood.
The set up ive gone for is nothing crazy i spent a fairbit of time researching.
At present i cant attack the corners like i used to. Ive lost confidence in the rear grip the Tyres are a048 but they look like theyve gone hard...they should have rescuffed in 5 laps like the front but no they have not.
The tyre issue was confirmed the next day as she spun up in 3rd on the road with little provacation. So new rear tyres are gonna be order...
What do you think on these settings....i asked for a Motorsport alignment
Thanks.

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Last edited by boosted on Sun Feb 17, 2019 10:13 am, edited 1 time in total.
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Re: Rx7 alignment...calling Peter H.

Post by boosted » Sun Feb 17, 2019 10:59 am

Here the settings...Image

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Re: Rx7 alignment...calling Peter H.

Post by warpc0il » Sun Feb 17, 2019 11:24 am

For those with a stiff neck
1cf0dbbb51e45003373f025b3b9b0283.jpg
1cf0dbbb51e45003373f025b3b9b0283.jpg (124.43 KiB) Viewed 372 times
Did they just adjust front/rear toe angles?
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Re: Rx7 alignment...calling Peter H.

Post by boosted » Sun Feb 17, 2019 11:27 am

I have original geo sheet ill post in amo...he did toe and camber...i think he forgot to record the b4 readings..

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Re: Rx7 alignment...calling Peter H.

Post by boosted » Sun Feb 17, 2019 11:34 am

First piccy is alignment just after i bought it.
2nd piccy is alignment now. ImageImage

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Re: Rx7 alignment...calling Peter H.

Post by boosted » Sun Feb 17, 2019 11:38 am

The way ive interpreted it is that the cars had some mild camber introduced and the toe reset afterwards...
And where the car was to soft b4 ive now gone to hard...should have just done the arbs not the springs...and the rear tyres....

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Re: Rx7 alignment...calling Peter H.

Post by 350matt » Sun Feb 17, 2019 12:19 pm

thats quite a bit of camber on the front? as your spec calls for 0.8 degrees and you have 2.4 ?

that said I've just measured 2.0 on my rexi so what do I know

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Re: Rx7 alignment...calling Peter H.

Post by boosted » Sun Feb 17, 2019 12:22 pm

Turn in is fantastic!!

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Re: Rx7 alignment...calling Peter H.

Post by PeteH » Sun Feb 17, 2019 12:40 pm

Here's my views. And please remember when reading this lot. That setting car up remotely is impossible.....

CAMBERS: Your front camber has been set to a very high negative value, but the rear hasn't changed from standard. This is a very imbalanced setup, and will promote oversteer. The rear end of a 7 isn't the best from a geometry perspective, and it really needs as much negative camber as it can. I'm not sure how much more camber you can get on the rear, but if it was me I'd be targeting -2.5 on the rear, and no more than -1.5 on the front.

TOES: Your toes are too conventional for a track car. The front is OK, but I'd be setting the rear to a fair bit more toe in. The 7 has an unfortunate tendency to toe out all by itself, so you need plenty of toe in to counteract it (this is the main reason Mazda went to a multi-link rear on the 8. I'd be aiming for +0.15 on each rear wheel (+0.3 total).

CASTER: This is the most worrying setting. You have a very small caster setting. On the 8 you can adjust the caster independently from the camber, but I don't know if you can on the 7. Your small caster may be because of the very large front camber setting. If you can you should add a lot of caster. You should be aiming for +8deg if you can. The reason this is so important is that with such a small caster setting your steering will be light and vague, and it will feel like it's turning itself into corners (it will feel like it's oversteering). If you can achieve front settings of -1.5deg camber, and +8deg caster at the same time then your car will feel so much better.

SPRINGS: It's hard to be specific without knowing all the other values (arb rates, lever ratios etc). But I'd be pretty certain that your rear springs are far too stiff. Pop your 8s back on the rear, and I guarantee it will feel ten times better.

TYRES: You already know the answer to this. Make sure your tyres are in good condition, and similar on all four corners. You need even better tyres on a 7 than you do on an 8, because the suspension isn't as capable.

PRESSURES: What are you running?

DAMPERS: Track settings will feel solid on the road. Going softer for the road is fine, but wind them back up on the track. As a general rule, start with the front at about 2/3 hard, and the rear at about 1/3 to 1/2 hard. You might need more rear if the rear end moves too much, but it's a safe starting point.

Try that lot. Then give me a drive in it..... ;) :D
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Re: Rx7 alignment...calling Peter H.

Post by boosted » Sun Feb 17, 2019 12:51 pm

Thanks mate alot!!!...spot on with the front its very uncertain going straight ahead...feels like its tramlining and steering very light even though the rack is manual! Turned in lovely on track but felt like the rear on nylon tyres...Ill be getting geo done again and after refitting 8kg springs...dont wanna smash up my baby again after fresh paint...
Big thanks from me!


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Re: Rx7 alignment...calling Peter H.

Post by 13Black » Mon Feb 18, 2019 11:16 pm

Useless post alert:

Here be what not enough toe-in at the rear produces. IDK about you but it actually looks quite fun.


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Re: Rx7 alignment...calling Peter H.

Post by warpc0il » Mon Feb 18, 2019 11:20 pm

Shirely that's toe-out ;)
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Re: Rx7 alignment...calling Peter H.

Post by Phil Bate » Mon Feb 18, 2019 11:26 pm

I like it. The whole drive to work could feel like one gigantic burnout =D>
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Re: Rx7 alignment...calling Peter H.

Post by 13Black » Mon Feb 18, 2019 11:52 pm

It is indeed toe out, and don't call me Shirley :P
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