Home Mobile Forum News Cookbook FaceBook Us T-Shirts etc.: Europe/Worldwide. eBay Motorsport Links Advertising  
Site Partners: SpotterGuides  
Related Sites: Classic Cars Monthly Your Link Here  

Go Back   TenTenths Motorsport Forum > Historic Racing & Motorsport History > Motorsport History


Reply
 
Thread Tools Display Modes
Old 16 Feb 2010, 06:21 (Ref:2634207)   #16
tjm535
Rookie
 
Join Date: Feb 2010
Australia
Melbourne
Posts: 9
tjm535 should be qualifying in the top 10 on the grid
bump
tjm535 is offline  
Quote
Old 2 Mar 2010, 07:14 (Ref:2643178)   #17
PETER THORBY
Rookie
 
Join Date: Sep 2005
Posts: 14
PETER THORBY should be qualifying in the top 10 on the grid
Brakes and LInder Engine

Brakes:
the calipers front and rear are "Formula 5000" spec. AP are currently making these and they are period replicas of what was used
Size and master cylinders, not sure.
but i will find out.

Linder Engine:
JPS had a guy called "Goofy", who was the Linder engine guru. The engine was built to the Group A spec's of the day. Essentially a standard engine balanced and free cam. the car had a big cam.
i can probably get you the cam specs, if you need them.
the car has a standard cast iron exhaust manifold.
and a standard computer (we think)
distributor with electronic control of fuel only.
the '86 325's had electronic fuel and spark
PETER THORBY is offline  
Quote
Old 2 Mar 2010, 23:54 (Ref:2643723)   #18
PETER THORBY
Rookie
 
Join Date: Sep 2005
Posts: 14
PETER THORBY should be qualifying in the top 10 on the grid
Brake Setup

i think this is correct!
Calipers are the original Girling Magnesium units (used in F5000, we believe)
F = 1 3/4 4 pot
R = 1 1/2 4 pot
discs, F = 330mm, R = 290mm
Master cylinders as per Frank Gardner
F = 3/4
R = 7/8
NB rears bigger than the fronts, but that was what Frank said!

What are you doing with this info?
building a replica?
restoring a car?
PETER THORBY is offline  
Quote
Old 3 Mar 2010, 05:19 (Ref:2643804)   #19
tjm535
Rookie
 
Join Date: Feb 2010
Australia
Melbourne
Posts: 9
tjm535 should be qualifying in the top 10 on the grid
Thank you for the info!!! I really appreciate it! I am started the build of a full replica jps. I have basically been working off pictures without any specs on anything. I already have a 2.5 motor that is balanced so its a lucky starting point! If you can find out cam specs it would be great. Brakes confused me a little cos they appear to be 4 piston fronts and twin rears so thanks for that info too. It also had me a little confused over the master set up as with most e30 race cars including my own, we all run brake boosters due to rulings in the class so i was unsure what sizes would be required to run front to rear.
Any other tech info would be greatly appreciated!!
tjm535 is offline  
Quote
Old 3 Mar 2010, 21:47 (Ref:2644456)   #20
YWW730
Rookie
 
Join Date: Dec 2009
Posts: 9
YWW730 should be qualifying in the top 10 on the grid
Quote:
Originally Posted by PETER THORBY View Post
i think this is correct!
Calipers are the original Girling Magnesium units (used in F5000, we believe)
F = 1 3/4 4 pot
R = 1 1/2 4 pot
discs, F = 330mm, R = 290mm
Master cylinders as per Frank Gardner
F = 3/4
R = 7/8
NB rears bigger than the fronts, but that was what Frank said!
With 330mm front rotors, I assume you are running 17" wheels, or does 16" squeeze over them?
YWW730 is offline  
Quote
Old 4 Mar 2010, 00:38 (Ref:2644524)   #21
tjm535
Rookie
 
Join Date: Feb 2010
Australia
Melbourne
Posts: 9
tjm535 should be qualifying in the top 10 on the grid
I havent sourced wheels yet but i will be running 17's.
tjm535 is offline  
Quote
Old 4 Mar 2010, 03:24 (Ref:2644565)   #22
PETER THORBY
Rookie
 
Join Date: Sep 2005
Posts: 14
PETER THORBY should be qualifying in the top 10 on the grid
Brakes

Well, that is how Frank set them up, and everyone queries that!!
the rears are 4 piston, i didn't say 2 piston?
i will try and get the cam specs for the 2.5 engine i run
pulls about 245 hp at 7200
do not go over 7200 as the 6 cylinder engines have an underlying harmonic problem, and are easily destroyed by breaking the cranks
the exhaust system is also critical. The original cast iron units are used with a 4 into two into one. you can lose a lot of horsepower by not replicating the set up.
i am racing this week end so i will try and post some photos for you
wheels are 16", tyres are Pirelli 600 x 225 x 16" 4 bolt
the 1986 cars had centre lock 16"
tissue paper gap between the wheels and the calipers
PETER THORBY is offline  
Quote
Old 4 Mar 2010, 05:23 (Ref:2644598)   #23
tjm535
Rookie
 
Join Date: Feb 2010
Australia
Melbourne
Posts: 9
tjm535 should be qualifying in the top 10 on the grid
So they never run extractors........I would have thought that the original manifold would have been very restrictive?

Is that 245 hp @ 7200rpm at the wheels?? I am guessing the rev limiter was raised. Does the car run standard rockers as i have had problems with these breaking with only a mild 288 cam.

The strut top also do not appear to be adjustible in pictures? Are these something that Gardner had made???
tjm535 is offline  
Quote
Old 4 Mar 2010, 13:20 (Ref:2644840)   #24
YWW730
Rookie
 
Join Date: Dec 2009
Posts: 9
YWW730 should be qualifying in the top 10 on the grid
Quote:
Originally Posted by tjm535 View Post
So they never run extractors........I would have thought that the original manifold would have been very restrictive?
LHD manifolds are different to the RHD log manifold. Often the case with BMWs.

Quote:
Originally Posted by PETER THORBY View Post
you can lose a lot of horsepower by not replicating the set up.
i am racing this week end so i will try and post some photos for you
wheels are 16", tyres are Pirelli 600 x 225 x 16" 4 bolt
the 1986 cars had centre lock 16"
tissue paper gap between the wheels and the calipers
Ta. I thought 330mm rotors and 16" rims would be a squeeze. BTW where are you racing?
YWW730 is offline  
Quote
Old 12 Mar 2010, 00:02 (Ref:2649999)   #25
tjm535
Rookie
 
Join Date: Feb 2010
Australia
Melbourne
Posts: 9
tjm535 should be qualifying in the top 10 on the grid
How did the racing go last weekend Peter???
tjm535 is offline  
Quote
Old 15 Mar 2010, 18:44 (Ref:2652918)   #26
PETER THORBY
Rookie
 
Join Date: Sep 2005
Posts: 14
PETER THORBY should be qualifying in the top 10 on the grid
Wheels, exhaust, brakes and suspension

The exhaust manifold, the original cast iron one, is apparently a very efficient system. Grp A dissallowed any alteration.
7200 is where the rev limiter is set
245hp is at the fly wheel, at the rear wheels would be very ambitious!!
higher than 7200, risks crankshaft breaks
My Mistake, the discs are 315mm x 28mm NOT 330mm
the car ran on 16" rims, and i have left it that way
the front struts at the top mount, have been altered by us to get more -ve camber in.
apprx 4mm
i had a good weekend racing, but sorry no photo's
PETER THORBY is offline  
Quote
Old 15 Mar 2010, 18:49 (Ref:2652923)   #27
PETER THORBY
Rookie
 
Join Date: Sep 2005
Posts: 14
PETER THORBY should be qualifying in the top 10 on the grid
rockers

Quote:
Originally Posted by tjm535 View Post
So they never run extractors........I would have thought that the original manifold would have been very restrictive?

Is that 245 hp @ 7200rpm at the wheels?? I am guessing the rev limiter was raised. Does the car run standard rockers as i have had problems with these breaking with only a mild 288 cam.

The strut top also do not appear to be adjustible in pictures? Are these something that Gardner had made???
The rockers are standard BMW, but polished to relieve stress, i have never broken any, ever!!

The strut top, not sure what Gardner did, i suspect they had to be standard, but we have slotted them to get adjustment,
PETER THORBY is offline  
Quote
Old 16 Mar 2010, 07:48 (Ref:2653297)   #28
tjm535
Rookie
 
Join Date: Feb 2010
Australia
Melbourne
Posts: 9
tjm535 should be qualifying in the top 10 on the grid
Thanks for that info!

Did you find out the cam specs??
tjm535 is offline  
Quote
Old 9 Nov 2010, 06:13 (Ref:2787480)   #29
E36ST
Racer
 
Join Date: Oct 2007
New Zealand
NZ
Posts: 231
E36ST should be qualifying in the top 10 on the grid
One for sale here:

http://www.trademe.co.nz/Trade-Me-Mo...-326926702.htm
E36ST is offline  
Quote
Old 22 May 2016, 00:27 (Ref:3643536)   #30
E36ST
Racer
 
Join Date: Oct 2007
New Zealand
NZ
Posts: 231
E36ST should be qualifying in the top 10 on the grid
Article here on Paul Radisich being reunited with the #25 JPS 325i:

http://www.pdf-archive.com/2016/05/2...l-radisich.pdf
E36ST is offline  
Quote
Reply

Bookmarks




Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Grp C/Grp A - where are they now - JPS BMW 635 CSI wants2know Australasian Touring Cars. 87 13 Jan 2018 21:50
BMW E30 DTM photos request Krysiaman Motorsport Art & Photography 1 16 Feb 2009 20:51
JPS Jordan rdjones Formula One 21 27 Jan 2003 22:27
Grp A BMW 325i Gerard Hodges Motorsport History 2 12 May 2000 03:07
Grp A BMW 325i Gerard Hodges Announcements and Feedback 1 10 May 2000 18:58


Powered by vBadvanced CMPS v3.2.3

All times are GMT. The time now is 20:39.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Original Website Copyright © 1998-2003 Craig Antil. All Rights Reserved.
Ten-Tenths Motorsport Forums Copyright © 2004-2018 Royalridge Computing. All Rights Reserved.