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View Full Version : Racing at Zandvoort/NL



MadMarx
05-22-2012, 03:22 AM
last weekends job:



https://www.youtube.com/v/voRy2ZfDhsY&amp;feature=share2ZfDhsY&amp;feature=share" type="application/x-shockwave-flash" wmode="transparent" width="425" height="350"> </embed></object>

Cheers
Chris

martx-5
05-22-2012, 07:01 AM
Great stuff...that small box at the top of the windscreen, is that a rear view camera??

Are the A/F ratios I'm seeing with carbs?? They appear to be acting like you have EFI...i.e. when you lift the ratios go lean. With my SU's, they go pig rich when I let off the gas. The rest of the time, they are similar to yours.

MadMarx
05-22-2012, 07:13 AM
The box on top is the rear view camera instead of the mirror which only shows my helmet.

The A/F ratios are made with Weber carbs. If the throttle plates close then all flow is stopped and no fuel is supplied from the jets anymore. That's why it goes lean then.
SU's have a flexible choke so they always have flow and start banging to the exhaust.

Cheers
Chris

BobbyD
05-22-2012, 10:37 AM
Is that a stock tranny?

arizonamike
05-22-2012, 10:51 AM
Great video. Thanks. I like that overdrive switch on the steering wheel.

MadMarx
05-22-2012, 11:04 AM
Is that a stock tranny?
Stock housing with straight cut dogs.

Cheers
Chris

angelfj1
05-22-2012, 02:50 PM
Chris: Just showed this video to my 3 year old grandson. He asked me if Spider-man was driving. (red gloves). :lol:

Monkeywrench
05-22-2012, 06:33 PM
How did the new motor perform?

MadMarx
05-23-2012, 02:24 AM
Its not a new motor, just maintained motor with new equipment, like 48 Webers.

Cheers
Chris

MadMarx
05-23-2012, 02:28 AM
Chris: Just showed this video to my 3 year old grandson. He asked me if Spider-man was driving. (red gloves). :lol:


https://www.youtube.com/v/4o29VoxtsFkVoxtsFk" type="application/x-shockwave-flash" wmode="transparent" width="425" height="350"> </embed></object>

Hap Waldrop
05-23-2012, 07:18 AM
Chris that looks like quite the busy track. When I first look at the speed, I thought, wait a minute no way can a race prepped TR4 do 165 mph on a straight, then it hit me, kilometers per hour, LOL. Cool video, thanks for sharing.

MadMarx
05-23-2012, 07:36 AM
Especially for the inch side of the pond the dials remained mph and the digits are kph.

arizonamike
05-24-2012, 10:03 PM
Chris, would you post more pictures of your car. You can hide the secret stuff.

What tires do you run?

How many speeds do you have, isn't that an overdrive box?

Oh yes...great driving too :-)

MadMarx
05-25-2012, 01:22 AM
I run on Yoko A048 205/60-15 tires.

you want more photos.....nothing easier that this:

https://lh6.googleusercontent.com/-AEUVP8dX-OI/Tvm2C_kDH-I/AAAAAAAABFg/euXDzfbix0A/s761/DSC01659.JPG
https://lh5.googleusercontent.com/-LEgbJMT3mnU/TO-OY2X0_dI/AAAAAAAAApA/HB6b_1OHkt0/s761/DSC00985.JPG
https://lh6.googleusercontent.com/-rn2xjsrsTso/TQ0Eg1-fGaI/AAAAAAAAAqQ/Oy8_Jepa7AE/s761/DSCN2953.jpg
https://lh3.googleusercontent.com/-mhaaAaz4wdc/TjgFkAZlqVI/AAAAAAAAA-c/ZhWQUlr7JT4/s649/DSC00518.JPG
https://lh6.googleusercontent.com/-IeE8VDYk00g/Tj0DRqBJFtI/AAAAAAAAA-w/k99oT1gUfc4/s865/DSC01882.JPG https://lh5.googleusercontent.com/-26VDgqw_TgA/Tl-ql1MhekI/AAAAAAAABAk/WCKZAJX33mU/s649/Kopie+von+Ausr%C3%BCckgabel.jpg
https://lh5.googleusercontent.com/-t3OLVtvqYJs/Tu9_wUOE8SI/AAAAAAAABEo/lKFnQ8PR6Ag/s761/Super+4+2.JPG
https://lh5.googleusercontent.com/-vgz9o7Dnnk0/TwDeiNL-N1I/AAAAAAAABGY/ZGYHt1iYqDQ/s761/DSC02389.JPG
https://lh6.googleusercontent.com/-xo4Pho3Pe74/TyewrR_0reI/AAAAAAAABLQ/6-Dk_SRgydM/s649/DSC00516.JPG
https://lh4.googleusercontent.com/-poM8SEbvgUs/Ty5MOaoHZOI/AAAAAAAABM0/UsEGr_zhOmk/s649/DSC01845.JPG
https://lh5.googleusercontent.com/-dF8q9Og1IWg/Ty5MGs53IcI/AAAAAAAABMs/8ULPVa10rs0/s649/DSC01846.JPG

MadMarx
05-25-2012, 01:33 AM
https://lh4.googleusercontent.com/-l1xwLe3C-2M/T2LvjM7UIQI/AAAAAAAABQE/MBaSLKxIZag/s649/rod.JPG
https://lh6.googleusercontent.com/-gmj5cWjT2_c/T5nFh9T7xNI/AAAAAAAABUs/nP-fxyUn0t4/s761/Saarbr%C3%BCcken-20120426-00105.jpg
https://lh6.googleusercontent.com/-6yBFWQdFVT4/T6ZUKv2ecvI/AAAAAAAABWI/oiVSX1iYnv4/s649/Importierte+Fotos+00007.JPG
https://lh6.googleusercontent.com/-vdMBHNHdTaM/T3OKEvvi9sI/AAAAAAAABRw/4-vAe94k8Sg/s761/DSC02630.JPG

arizonamike
05-26-2012, 10:16 AM
Thanks Chris, that yellow TR3 can be had. Good luck.

martx-5
05-26-2012, 11:22 AM
I've been working on a brake set-up similar to yours, and have a few questions. On the dual master brake set-up are you using 5/8" bores on both? and did you change the mechanical advantage on the pedal? and, are the calipers stock or do you have calipers with a larger piston area? or, do you just have a booster hidden somewhere??

MadMarx
05-26-2012, 11:44 AM
On the dual master brake set-up are you using 5/8" bores on both?
right 5/8" for both - from Girling. Front brake with tank extention.


and did you change the mechanical advantage on the pedal?
No, all stock. No changes.


and, are the calipers stock or do you have calipers with a larger piston area?
Front calipers stock, rear hydraulic between 0,75" - 1".
Currently I run 1"


or, do you just have a booster hidden somewhere??
No boosters.
Good brake pads are enough.
I run EBC YS.

Cheers
Chris

martx-5
05-26-2012, 01:56 PM
Thanks. That helps me a lot.

MadMarx
05-27-2012, 03:30 AM
Thanks. That helps me a lot.

Be warned:
1" rear brake hydraulics are close to the edge and need very sensitive adjustment!
My brake system was blocked by the sand on this track and look what happend in race 3:


https://www.youtube.com/v/OCaWAKRZND0AKRZND0" type="application/x-shockwave-flash" wmode="transparent" width="425" height="350"> </embed></object>

martx-5
05-27-2012, 09:28 AM
Well, I wasn't planning on putting the 1" pistons in the rear. By the way, I like the way you worked out setting the bias on the fly.

MadMarx
05-28-2012, 04:06 AM
...., I wasn't planning on putting the 1" pistons in the rear. By the way, I like the way you worked out setting the bias on the fly.

I felt at Scheivlak corner that there is something wrong with the brake bias. I turned the adjustment wheel 2 turns to the left but the spindle was blocked with sand so the adjustment remained in the same position which made the car over brake seriously on that sharp right hander.
Was an interesting feel as everything felt okay at first, than the rear felt like packed in cotton. I heard the rear wheels squeaking. Went off the brake, the grip returned and off I was. :cryin:

arizonamike
05-28-2012, 05:20 PM
:cry: :cryin:

:thirsty:

Simon TR4a
05-29-2012, 11:07 AM
That valve is a work of art! Gorgeous..

I am sure vintage rules will not allow anything lower profile than 60 series for vintage racing, though some US sanctioning bodies such as HSR allow more latitude.

I used to use 205/50/15 Yokohama 032R in Solo 1 but thay did not really suit the irs very well, lots of grip but very sudden breakaway. Trailing throttle oversteer was the quick way into the corner.

I used a TR6 sway bar on the front, none on the rear, this helped reduce wheelspin out of second gear corners. My brake pads were Rewpco semi metallic (from Australia), but overall my car was not nearly as highly developed as yours.
Nice to see the details, thanks Chris!

MadMarx
05-29-2012, 11:19 AM
That valve is a work of art! Gorgeous..

I am sure vintage rules will not allow anything lower profile than 60 series for vintage racing, though some US sanctioning bodies such as HSR allow more latitude.

I used to use 205/50/15 Yokohama 032R in Solo 1 but thay did not really suit the irs very well, lots of grip but very sudden breakaway. Trailing throttle oversteer was the quick way into the corner.

I used a TR6 sway bar on the front, none on the rear, this helped reduce wheelspin out of second gear corners. My brake pads were Rewpco semi metallic (from Australia), but overall my car was not nearly as highly developed as yours.
Nice to see the details, thanks Chris!

Hi Simon,

The valve is a stock valve reshaped and polished. I'm on stock diameter.

I'm not sure if my car has any development. I think it is quite stock like.
I just replaced questionable things like the rods with cheap V8 rods. As these rods have a narrow big end the Mahle forged pistons center the rods. This might be development if you like.
The Yokos provide loads of grip but the problem is the narrow wheel with just 6" width. Too narrow for the tires but if you run them on 31 psi cold they are miracle to drive and very very fast and easy to drive.

I don't like sticky brake pads. I prefer mild pads for racing. Might save some tires too if the brake is not too harsh. I use EBC YS on front and stock shoes at rear. Kendall shoes at rear are great too but pricey.

I run much camber on front - 4.5 degree. Gives good cornering with a very stiff front swaybar 21mm and a 17mm rear swaybar. Both adjustable.

Nearly all things I've taken out of the Kas Kastner books. A great source of tested knowledge and still up to the task.

Cheers
Chris