Jump to content
SAU Community

Recommended Posts

Have just done the first test session on semis i felt the car was a little loose in the back end any ideas on how to best make it stick just a little more.

I think that the spring rating maybe just a bit to firm and is picking up the inside rear enough to allow to brake traction.

Any comments will be well recieved. And i will pass the 997 turbo next time i swear.

regards

Link to comment
https://www.sau.com.au/forums/topic/131749-comment-please/
Share on other sites

Have just done the first test session on semis i felt the car was a little loose in the back end any ideas on how to best make it stick just a little more.

I think that the spring rating maybe just a bit to firm and is picking up the inside rear enough to allow to brake traction.

Any comments will be well recieved. And i will pass the 997 turbo next time i swear.

regards

I need to know a few details before I can really make any meaningful suggestions;

1. Spring rates?

2. Shock brand?

3. Stabiliser bar size?

4. Stabiliser bar settings, if adjustable?

5. Wheel alignment settings?

6. HICAS or not?

7. Engine power?

8. LSD type and condition

That'll do for a start.

:) cheers :)

Link to comment
https://www.sau.com.au/forums/topic/131749-comment-please/#findComment-2440746
Share on other sites

I need to know a few details before I can really make any meaningful suggestions;

1. Spring rates?

2. Shock brand?

3. Stabiliser bar size?

4. Stabiliser bar settings, if adjustable?

5. Wheel alignment settings?

6. HICAS or not?

7. Engine power?

8. LSD type and condition

That'll do for a start.

:) cheers :O

Ok in answer to the replies yes i think the rear is far to hard and the spring rate will need to be lowered but i will follow due course as you guys have years more experience with these cars.

1. Hard, :( thats all i know they were on the car when purchased or rescued from scrap yard is a better term.

2. Ohlins all round non adjustable

3. standard front and back

4. N/A

5. Neutral toe settings front and rear, and 1mm neg camber on front and back and no caster adjust as standard items used.

6. Lock bar in use removed the HICAS

7. about 400 hp at fly guess though but would be close.

8. I dont know to be honest be i would assume factory.

Also i need to mention i am running semi's as mentioned but the car was not handle like this on the track day i ran a few months ago. I have installed a 7 point cage ( as mention in another forum ) could this have stiffened the car?

Edited by tacker
Link to comment
https://www.sau.com.au/forums/topic/131749-comment-please/#findComment-2441108
Share on other sites

As well as the spring rates, you might want to experiment with different turn in points (try later compared to other cars) and get an attesa controller and dial in more front drive than standard (they are pretty taily stock, later models addressed this with more front drive to some extent)

Link to comment
https://www.sau.com.au/forums/topic/131749-comment-please/#findComment-2441430
Share on other sites

Ok i should have been a bit more imformative with my request.

Car was good coming out of corners as there are only 2 second gear corners the rest are either 3rd or one very quick 4th. The car was turning in well but would become loose in the rear mid corner with a nice consistant throttle and not just pushing it straight to the floor. And this was a constant right through out the 4 x 20 minute sessions no matter what lines i tried. I am sure it is either the swaybar or springs or even both. As it was the car was nice and consistant it just needed a bit more rear traction and it would be a much better car to push around a track.

Regards

Link to comment
https://www.sau.com.au/forums/topic/131749-comment-please/#findComment-2441744
Share on other sites

Ok in answer to the replies yes i think the rear is far to hard and the spring rate will need to be lowered but i will follow due course as you guys have years more experience with these cars.

1. Hard, :rolleyes: thats all i know they were on the car when purchased or rescued from scrap yard is a better term.

2. Ohlins all round non adjustable

3. standard front and back

4. N/A

5. Neutral toe settings front and rear, and 1mm neg camber on front and back and no caster adjust as standard items used.

6. Lock bar in use removed the HICAS

7. about 400 hp at fly guess though but would be close.

8. I dont know to be honest be i would assume factory.

Also i need to mention i am running semi's as mentioned but the car was not handle like this on the track day i ran a few months ago. I have installed a 7 point cage ( as mention in another forum ) could this have stiffened the car?

Suggestions follow;

1. You really need to know the spring rates, this thread shows you how to get the dimensions, then send them to me and I will work out the spring rartes for you.

http://www.skylinesaustralia.com/forums/in...showtopic=79157

2. I have never seen non adjustable Ohlins. Are you sure they are Ohlins? Are you sure that they are non adjustable? No knobs or allen key adjusters on the shock tops?

3 & 4. For regular circuit work you really should look at upgrading to adjustable stabiliser bars, that will enable you to tune the handling balance

5. For regular circuit work you really need around 2.5 to 4.0 degrees negative camber at the front and 1.0 to 2.0 negative camber at the rear. More caster (than standard) is even more essential, do yourself a favour and spend ~$120 and get a caster adjusting kit.

6. Good move

7. That's enough to get some power oversteer

8. OK

On to your observations. For mid corner oversteer, my first guess is the rear spring rate is too high, not unusual for a Japanese kit. Hence why you need to spend a few minutes and get those coil spring dimensions. If you had adjustable stabiliser bars you could have wound on a bit more front bar, that would have overcome the oversteer. Or wound off the rear bar, if it wasn't already at its softest setting.

You could try a little rear toe in, say 2 mm. That will help with the midcorner oversteer, but the downside might be poorer turn in response. It's simply a matter of trying it.

For driving technique, I would try a slightly slower corner entry and then use a little power at mid corner. This gives the front wheels a little torque which tends to pull the car straight. Not large lump of throttle, just a progressive squeeze, which will them give you a higher entry speed to the next straight.

Hope that has been of some help

:thumbsup: cheers :(

Edited by Sydneykid
Link to comment
https://www.sau.com.au/forums/topic/131749-comment-please/#findComment-2441837
Share on other sites

Cheers SK,

I am just about to get on a plane for Angola ( Lucky huh ) but i will do as you say as soon as i get back into Dubai.

I have read your thread on the sprind rates and i will post them to you ASAP. The shocks are ohlins but i will have to check the allen key bit.

Angain thanks for the help and i will order the castor adjust kit.

Regards

Link to comment
https://www.sau.com.au/forums/topic/131749-comment-please/#findComment-2442019
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • Hi guys, has anyone either purchased or built themselves a rotisserie for their car before? I can only just justify the need for one hence why I should just make one but at the same time, if I make one I can kiss another 4 weeks of potentially productive car working time goodbye because I'm building a bloody rotisserie....  I mainly want it for the application of the body deadener.  Cleaning the old stuff off, priming and then colour over the deadener doesn't worry me, it's just the application using the Schutz Gun that I feel would achieve a significantly better finish painting it side on and keeping the Schutz Gun upright.  I don't think they would work well on the side let alone almost upside down for some areas.  If the product I use (Terosun, etc) could work through a HVLP ok then it might be ok to apply without the rotisserie.   I can get one of these style ones for about $1200 which is pretty good value-     I reckon if I made one it would cost around $500 but it's more the time that it would take is more of a killer than the cost.  They look to hold their value pretty well second hand so I could always sell it after using it and realistically only lose $200-$300 at worst.  Or keep it and buy another project when this one finally sees the light of day... Anyone selling one...? Cheers!  
    • While it is a very nice idea to put card style AFMs into the charge pipe (post intercooler, obviously), the position of the AFM and the recirc valve relative to each other starts to become something that you really have to consider. The situation: The stock AFM is located upstream the turbo, and the recirc valve return is located between the AFM and the turbo inlet, aimed at the turbo inlet, so that it flows away from and not through the AFM. Thus, once metered air is not metered again, neither flowing forwards, or backwards, when vented out of the charge pipe. When you put the AFM between the turbo outlet and the TB, there is a volume of pressurised charge pipe upstream of the AFM and there is a volume of pressurised pipe downstream of the AFM. When the recirc valve opens and vents the charge pipe, air is going to flow from both ends of the charge pipe towards the recirc valve. If the recirc valve is in the stock location, then the section between it and the TB doesn't really matter here - you're not going to try to put the AFM in that piece of pipe. But the AFM will likely be somewhere between the intercooler and the recirc valve, So the entire charge pipe volume from that position (upstream of the AFM, back through the intercooler, to the turbo outlet) is going to flow through the AFM, get registered as combustion air, cause the ECU to fuel for it, but get dumped out of the recirc valve and you will end up with a typical BOV related rich spike. So ideally you want to put the AFM as close to the TB as possible (so, just upstream of the crossover pipe, assuming that the stock crossover is still in use, or, just before the TB if an FFP is being used) and locate the recirc valve at the turbo outlet. Recirc valve at the turbo outlet is the new normal for things like EFRs anyway. In the even of a recirc valve opening dumping all the air in the charge pipe, pretty much all of it is going to go backwards, from the TB to the recirc valve near the turbo outlet. But only a small portion of it (that between the TB and the AFM) will pass through the AFM, and it will pass through going backwards. The card style AFMs are somewhat more immune to reading flow that passes through them in reverse than older AFMs are, so you should absolutely minimise the rich pulse behaviour associated with the unavoidable outcome of having both a recirc valve and an AFM in the charge pipe.
    • Yep, in my case as soon as I started hearing weird noises I backed off the tension until it sounded normal again. Delicate balance between enough tension to avoid that cold start slip and too much damaging things.
    • I'm almost at a point where I feel like changing the alternator. Need to check the stuff you mentioned first though.
×
×
  • Create New...