TonyG

900/1100 won't cause oversteer. The effective wheel rate is around 810/616.

If anything, the car is probably pushing.

I run 750/1000 on 315 square R specs and the car pushes still. I had to go back to using the rear sway bar and am going up on the rear spring rates again.

Patrick... what are the weights at each wheel?

TonyG

TonyG

What is the weight at each wheel?

That's the stock wastegate with a custom made diaphragm. They never really work like a good aftermarket wastegate.


TonyG

Paulyy

We used a Comp-Gate 40mm, DualPort BOV & an eBoost2 on my mates boosted VY berlina LS1 with a GT4202 turbo. exceptional products!

333pg333

Don't have enough time on it yet to tell if it's over or understeering. Literally had a handful of laps without any proper shock settings. In fact thought they were all on full soft the other day but it turns out that they were except for the rear RHS...which was on full hard! So that wasn't helping any. To add, we only had 10" wheels all round with 265 / 285 older slicks on. So no real test. More just to see that nothing fell off or any leaks. As it turned out we had an electronic glitch for most of the day, hence the lack of laps / feedback.

Now switched to 10.5"/11.5" wheels and 285 / 305 new slicks and set the suspension up half decently with a corner balance, so things should improve drastically from the last outing. Just hoping we have a clear day on the weekend. Tony, I don't have the corner weights to hand. It only got done late yesterday. I'll post when I have them.

MC 968CS

Hi, Pat, I just sent you the form. You may want to edit your email off that page asap. MC968CS

Dubai944

Every setup is different of course. It depends on what else is going on, corner weights as you say, type of bars, type of diff, types of tires, types of shocks etc etc. Your rear wing will be making a big difference to the equation compared to a car that doesn't run one.

I used to run 700/900 and 900/1100 when I ran a typical tire stagger and it worked well, but once I went to the big fronts they needed to be made to work a lot harder. Went from 900/1100 to 900/1000 to 1000/1000 to 1100/1000 to 1200/1000 to find the balance I have now and my car still tends slightly toward the oversteer side of neutral. I could disconnect the rear bar of course, and when I get my wing on I expect it will need more relative rear spring, but the way Pat's car is setup now with Tarrets, Motons and no rear wing on is very similar to mine and I suspect those spring rates will tend to cause oversteer.

333pg333

Got it Mark. I'm entered as of this morning. Hope the rain holds off. I edited my email address off my post but can't edit it off yours using it as a quote lol. Don't care so much.

That's interesting Steve. I ran a staggered spring setup previously with square or square-ish wheel/tyre combos and didn't suffer too much oversteer. As you say, there is sooooo much to take into consideration. Even the size of your s/c pulley will have an effect. We can only try these ones as supplied by Moton.
Interestingly, the engineer knew of the Motons even though they're hardly heard of out here. He said that while they were favoured in the U.S. he found them only 'ok' and that they'd take a little longer to setup. I've had them put on a dyno and while not totally conclusive, he did say that they had some good and not so good results...but all could be worked with. He is not a vendor for suspension.

MC 968CS

Cool. Edit sorted too, missed it got copied! See you Sunday.

Steve113

Also consider where it has over steer or under steer. Beginning ,middle ,exit of a turn. The solutions are different depending on this information.

95ONE

Handling explanations can be so subjective. Is it really understeering going into the corner, or Is it handling that way because you were accelerating/decelerating, and or just instantly turning the wheel as hard as you can at the last second? Many people don't understand why a car is handling the way it is. They think that's what it just does, and has nothing to do with their driving style. I can make a bad understeering front drive car oversteer no problem. Trail brake weight transfer cures that right up. Downshifting and clutch dumping does too. Too many ways to skin this cat. Sure, there are definite characteristics of a set up. But is it being described without driver confusion? Advisee or advisor can be liable in this.

So, desktop suspension tuning is fairly worthless for most. I'm sure Patrick understands handling dynamics and all, but He'll find out on his own while driving the car, and while listening to Paul.

333pg333

They don't describe it as a Black Art for no reason! Of course it can start to get very technical very quickly and start to swamp simpletons like me who'd prefer to just get in and drive but learning is good for the grey matter (not the ever thinning thatch of hair on top either) and I've got some good heads around me so we should see some progress in the coming months.

As Steve rightly points out, this is all without the wing so far. The engineer, Mark, is of the opinion that on sticky slicks I might almost not need the wing, especially with the current motor. When we switch over to R specs for SuperLap the wing will be of more benefit extracting more grip out of those tyres. The added drag will be something else to negotiate. At least we have some data measuring devices hooked up now so perhaps amid the added confusion that the squiggly lines will present me, the smart guys can progress at a faster rate...well that's the plan anyway.

333pg333

So went to the dyno again with the new wastegate. Got some basic charts back. Included is a back to back run with the ramp rates changed just to show how you can pick up instant hp without doing a thing. This is still on a conservative brand dyno compared to others so we could bump 400whp if we wanted to post a number.

That's it for this motor. No more mechanical changes now.

95ONE

I hear you Patrick. After so much messing, it is insane to not just go drive it. I'd love to see what the stock cam would look like though. Maybe next season.

P.S. You guys spell Tire funny.

333pg333

Got a weekend track event starting tomorrow Bruce, so drive it I shall!!
Yes, stock cam could be interesting but when driving this car on track it gets up after 4000rpm anyway so it's never anywhere near that low so it's not bad in reality. It's still seeing 1bar at about 3600rpm which is really not much higher than my old k26/8. All the guys who say they're hitting 1 bar at 3k or lower have my admiration, but I'm not sure that they're not running out of puff before I am at 7000rpm. I have a feeling that my old 3" exhaust might have given a different curve too.

ps...so do you hehehe

blown 944

What are the specs on this engine? I havnt kept up on your power plant