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11 second mk6 escort
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kiwicar
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Joined: 18 Nov 2006
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Location: Milton Keynes


PostPosted: Thu May 24, 2012 9:47 am    Post subject: Reply with quote

Hi
There is also a suspension issue here aswell
I think a quick glance at that photo as they leave the line tells quite a tale, Jays car does not squat, it just goes forward, the front unloads but the back does not move, if anything it lifts slightly, this is just about perfect for getting away quickly. Dels car spends too much efffort compressing the rear suspension, if he moved the locating points of the front of the lower wishbone up about an inch, maybe inch and a half then alot of that squat would go and he would leave the line quicker.
Derek, have a look here http://www.lencoracing.com/CS3MasterPage.html
and dream of full power shifts with a clutch, you could go for 4 cases and a reverser and up the final drive ratio in yours, and think of all those loverly leavers to play with! Nutz
Best regards
Mike
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dbv8
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Joined: 21 Jul 2008
Posts: 477
Location: Barrow-in-Furness

1998 TVR Chimaera

PostPosted: Thu May 24, 2012 10:30 am    Post subject: Reply with quote

kiwicar wrote:

Dels car spends too much efffort compressing the rear suspension, if he moved the locating points of the front of the lower wishbone up about an inch, maybe inch and a half then alot of that squat would go and he would leave the line quicker.
Mike


Hi Mike, this is the sort of information i have been looking for.
Doesnt sound like a simple fix. I could do with some further explanation really. I always knew the IRS was the Achilles heal for drag racing. I dont want to lose the handling characteristics of the car for the road and track so maybe i could make the locating points and wishbones adjustable smehow Confused
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10.612 @ 129.77
176.5 standing mile.
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kiwicar
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PostPosted: Thu May 24, 2012 10:55 am    Post subject: Reply with quote

Hi Denis
there is actually no reason for an indipendent rear end not good for drag racing, it is a case of getting it all set up right and accepting slight compromises.
I would get a copy of this book http://www.amazon.co.uk/Chassis-Engineering-HP1055-Herb-Adams/dp/1557880557/ref=sr_1_1?ie=UTF8&qid=1337856431&sr=8-1
and have a good read! it explains how to get anti squat (and anti dive) working on an indipendent set up.
I suspect that all you need to do on your chassis is to replace the front lower mounting brackets on your chassis with a longer version with 2 or 3 extra holes in them. The Mclaren chassis I have is set up for anti squat at the rear, it is not a big change to make. You may need to change the front lower wishbone end for a rose joint, just the one it shouldn't make the ride harsh just doing the one. The only down side is that doing this will be that under very hard braking the rear wheels will lock slightly earlier (unless you put in a bit of anti dive at the front!)
You might also benifit, if you have adjustable dampers at the rear, from winding out nearly all the rebound damping and wind in all hte compression damping (when you are at the track!)
Best regards
Mike
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dbv8
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Joined: 21 Jul 2008
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Location: Barrow-in-Furness

1998 TVR Chimaera

PostPosted: Thu May 24, 2012 11:04 am    Post subject: Reply with quote

Derek btw not Denis Very Happy

I will get the book and some glasses (much needed) and have a good read.

I have 3 way adjustable Nitrons on the rear of the TVR. I only gave them a couple of clicks more on the bump and took a few out of the rebound.
Next time at track i will adjust them much more.
Would stiffer springs on the rear also help?
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kiwicar
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PostPosted: Thu May 24, 2012 12:21 pm    Post subject: Reply with quote

OOps very sorry Derek, I was doing OK with Del aswell, not sure what happened, won't happen again (hopefully).
Best regards
Mike
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mgbv8
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1975 MG MGB GT V8

PostPosted: Thu May 24, 2012 8:19 pm    Post subject: Reply with quote

Fancy getting his name wrong ?? Shame on you Mike Wink

As we discussed in a previous mail Del, sorry Derek Wink
Adjust those dampers to resist bump on the rear and rebound on the front.
This will help weight transfer quicker off the line. But it will put more load on the tyres so they need to be really sticky from a proper burnout. (line lock ????) Another job eh Smile

If you have enough adjustment to make it launch better and the tyres dont hang on you will be drifting through 1st and 2nd gears. Your rear tyres are a bit hard on the side wall so will be unforgiving if they let go off the line.

I dont know how much adjustment you have at the mo but for a start I would say take 50% out of the bump adjustment you have left on the back and about 75% of the rebound adjustment you have left up front.

Your car is less likely to suffer hard body roll like mine does off the line so the irs is ok. You just need to tweak stuff around it to improve things while still keeping it good for road and circuit as you can mark your adjustment points.

If you are happy that the clutch and drive shafts are up to the job you should be able to nail that 10 without making serious mods.

You only need 0.3 off your present PB to make a 10.95 ???

You can do this in the 60 foot......

And get that bloody nitrous controller fitted so you dont have to faff with the button. Thats losing you valuable time on the 1/4 as well...

Regards
Pel (Perry) Laughing
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Perry Stephenson
MGB GT + Rover V8
9.62 @ 137.37mph
Now looking for 8 seconds with a SBC engine
http://www.youtube.com/watch?v=nVscbPHgue0&list=UUqIlXfSAoiZ--GyG4tfRrjw

https://www.youtube.com/watch?v=eg3avnsNKrc&index=2&list=FLqIlXfSAoiZ--GyG4tfRrjw
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dbv8
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Joined: 21 Jul 2008
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Location: Barrow-in-Furness

1998 TVR Chimaera

PostPosted: Fri May 25, 2012 7:41 am    Post subject: Reply with quote

I dont mind being called Del, most people South of Watford call me that for some strange reason Confused
I get called allsorts of things at home as you can imagine, but Denis is a new one Laughing

Ive ordered that book Mike and have a few ideas and settings to try at York a week on Sunday. We all know its the best track at my level so if i am going to hit a ten it will be there Cool

PS.... that 11.3 at the pod had some junk in the boot and Alex in the passenger seat. That extra weight has to be worth a tenth at least so lets say i matched my PB Wink
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mgbv8
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1975 MG MGB GT V8

PostPosted: Fri May 25, 2012 1:42 pm    Post subject: Reply with quote

dbv8 wrote:
I dont mind being called Del, most people South of Watford call me that for some strange reason Confused
I get called allsorts of things at home as you can imagine, but Denis is a new one Laughing

Ive ordered that book Mike and have a few ideas and settings to try at York a week on Sunday. We all know its the best track at my level so if i am going to hit a ten it will be there Cool

PS.... that 11.3 at the pod had some junk in the boot and Alex in the passenger seat. That extra weight has to be worth a tenth at least so lets say i matched my PB Wink


Without a doubt Den!
He must weigh 10 stone I reckon.

You should try telling folk your name is Perry over the phone. I even say "P for Papa Perry" and most still dont catch on.
I've had Barry, Larry, Terry, Jerry and my fave.. Percy Smile

You on track this weekend ?

Pel
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Perry Stephenson
MGB GT + Rover V8
9.62 @ 137.37mph
Now looking for 8 seconds with a SBC engine
http://www.youtube.com/watch?v=nVscbPHgue0&list=UUqIlXfSAoiZ--GyG4tfRrjw

https://www.youtube.com/watch?v=eg3avnsNKrc&index=2&list=FLqIlXfSAoiZ--GyG4tfRrjw
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kiwicar
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PostPosted: Fri May 25, 2012 4:57 pm    Post subject: Reply with quote

Can I suggest putting the junk on the side of the track and Alex in the boot Very Happy that will help the rear tires hook up.
The book is a good read, I'm just surprised you haven't ordered the Lenco though they really do look very cool with 1 leaver for each gear Shocked .
best regards
Mike
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frankenscort
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Joined: 02 Apr 2012
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Location: buckingham

1998 Ford Escort

PostPosted: Sun May 27, 2012 5:37 pm    Post subject: Reply with quote

hey guys, i mite get a better mph soon, dads new slicks dont fit in his arches so he is having mine and im gettin his spanky new ones. mine are 28" tall his are 29.5" tall, its easier for me to cut the metal on my arch away.

only time will tell though.
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mk6 escort v8 current time 11.6 @ 112mph
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dbv8
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Joined: 21 Jul 2008
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Location: Barrow-in-Furness

1998 TVR Chimaera

PostPosted: Mon May 28, 2012 11:07 am    Post subject: Reply with quote

According to my simple maths at 112 mph on 28" tyres and a 4.11 diff you are at about 5500 rpm.

On 29.5" tyres at the same engine speed you would be at 117.
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JJMclure
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1989 Vauxhall Carlton

PostPosted: Mon May 28, 2012 11:48 am    Post subject: Reply with quote

dbv8 wrote:
Pics nearer the start tell some of the story.....





and it gets further apart until the 1/8 as Pel says, then i start catching.


Is that your lunchbox on the dash?!?!
only joking looks a good launch or is that lunch? Sorry!
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frankenscort
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1998 Ford Escort

PostPosted: Mon May 28, 2012 4:53 pm    Post subject: Reply with quote

dbv8 you are bang on there mate, i am at 5500rpm acros the line.

jj, dont be mean, that tells me wen it is going to blow up, but hasnt told me yet.
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mk6 escort v8 current time 11.6 @ 112mph
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mgbv8
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1975 MG MGB GT V8

PostPosted: Tue May 29, 2012 8:52 pm    Post subject: Reply with quote

dbv8 wrote:
According to my simple maths at 112 mph on 28" tyres and a 4.11 diff you are at about 5500 rpm.

On 29.5" tyres at the same engine speed you would be at 117.


Its actually a 3.9:1 diff. So pretty close to the numbers eh assuming a bit of slip from the 50 torque converter ?
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Perry Stephenson
MGB GT + Rover V8
9.62 @ 137.37mph
Now looking for 8 seconds with a SBC engine
http://www.youtube.com/watch?v=nVscbPHgue0&list=UUqIlXfSAoiZ--GyG4tfRrjw

https://www.youtube.com/watch?v=eg3avnsNKrc&index=2&list=FLqIlXfSAoiZ--GyG4tfRrjw
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