Go Back  RX7Club.com - Mazda RX7 Forum > Tech and Performance > Race Car Tech
Reload this Page >

restoring a factory 90's imsa gtu racecar

Race Car Tech Discuss anything related to road racing and auto X.

restoring a factory 90's imsa gtu racecar

Old 11-15-16, 11:32 PM
  #51  
Senior Member
 
Join Date: Mar 2001
Location: Walnut, CA
Posts: 720
Likes: 0
Received 2 Likes on 2 Posts
nice !! thanks for the detailed pictures, always wondered what a IMSA car looked like on the inside.

how did you come across this race car? would love to hear that story
Alpine is offline  
Old 11-20-16, 01:39 PM
  #52  
Senior Member
Thread Starter
 
Join Date: Jan 2006
Location: nanaimo
Posts: 428
Likes: 0
Received 5 Likes on 5 Posts
Decided to check the wheel bearings. One side was pretty dry so we will repack them all with neo synthetic bearing grease.
racingdriver is offline  
Old 11-21-16, 09:43 AM
  #53  
Junior Member
 
Join Date: Nov 2016
Location: Erie,Pa
Posts: 8
Received 0 Likes on 0 Posts
this is awesome!!!!
Vash Stampede is offline  
Old 11-26-16, 10:12 AM
  #54  
Senior Member
Thread Starter
 
Join Date: Jan 2006
Location: nanaimo
Posts: 428
Likes: 0
Received 5 Likes on 5 Posts
New Aircraft aluminum floor . Lots of rivets were sacrificed here.
Naca duct under car for rear brake cooling.
racingdriver is offline  
Old 12-05-16, 08:53 PM
  #55  
Eats, Sleeps, Dreams Rotary
 
Valkyrie's Avatar
 
Join Date: Oct 2004
Location: Japanabama
Posts: 4,210
Received 6 Likes on 6 Posts
You don't have to drill out all those rivets to service the undercarriage, do you? Or does it come off in sections?
Valkyrie is offline  
Old 12-13-16, 02:38 PM
  #56  
Rotary Enthusiast
iTrader: (1)
 
Join Date: Jul 2004
Location: Rocket City, Alabama
Posts: 1,035
Likes: 0
Received 1 Like on 1 Post
Wow, that is a major undertaking.

I have seen John Finger's car with the MX-6 bodywork at the Mitty, maybe 8 or so years ago. He was paddocked right next to me. He had it for sale, and was asking $60k or $75k at the time; I can't remember the exact amount.

I wish you were not so far away from me, I would really like to see it at the track again. I have been vintage racing for 21 years now. With your tube frame, you would probably be classed in SVRA Group 10, class GT2. My tub chassis 1979 GTU car runs in SVRA GT3.

Last edited by speedturn; 12-13-16 at 02:43 PM.
speedturn is offline  
Old 12-14-16, 02:01 PM
  #57  
Senior Member
Thread Starter
 
Join Date: Jan 2006
Location: nanaimo
Posts: 428
Likes: 0
Received 5 Likes on 5 Posts
The bottom of the car consists of 3 pieces , only the centre floor is riveted. Axle and cv installed.
Finally the car is back on its wheels. It's off to the body shop next week !
racingdriver is offline  
Old 12-14-16, 03:36 PM
  #58  
brap brap brap
iTrader: (2)
 
evo_koa's Avatar
 
Join Date: Jan 2012
Location: Huntsville, Al
Posts: 1,195
Received 14 Likes on 14 Posts
its coming together nicely
evo_koa is offline  
Old 12-14-16, 07:25 PM
  #59  
rx7 killer
 
ivegonemad's Avatar
 
Join Date: Oct 2006
Location: LOS ANGELES, HAWTHORNE
Posts: 1,883
Received 0 Likes on 0 Posts
Originally Posted by racingdriver View Post
760 hp 3 rotor turbo stock chassis vs 330 hp tube frame . It will be interesting to see which is faster!
Incredible work! Thanks for sharing.
Your garage is a dream
ivegonemad is offline  
Old 12-15-16, 07:11 AM
  #60  
Senior Member
 
Join Date: Oct 2013
Location: Clemmons, NC
Posts: 652
Received 20 Likes on 17 Posts
awesome work so far. Please tell me you are going to get a new wiring harness made!
Freeskier7791 is offline  
Old 12-15-16, 09:39 AM
  #61  
Senior Member
 
Marf's Avatar
 
Join Date: May 2013
Location: Sussex, UK
Posts: 300
Likes: 0
Received 0 Likes on 0 Posts
This is sofa king cool
Marf is offline  
Old 12-17-16, 11:20 AM
  #62  
Rotary Enthusiast
iTrader: (3)
 
mustanghammer's Avatar
 
Join Date: Nov 2006
Location: Parkville, Mo
Posts: 1,102
Likes: 0
Received 21 Likes on 17 Posts
Thanks for posting! The level of detail on race cars like these is so cool to see.
mustanghammer is online now  
Old 12-25-16, 01:13 AM
  #63  
Senior Member
Thread Starter
 
Join Date: Jan 2006
Location: nanaimo
Posts: 428
Likes: 0
Received 5 Likes on 5 Posts
Starting on the bodywork. Will spray putty and block sand next.

racingdriver is offline  
Old 01-09-17, 01:17 PM
  #64  
spoon!
 
Kenku's Avatar
 
Join Date: Sep 2002
Location: Dousman, WI
Posts: 1,089
Received 10 Likes on 7 Posts
OK, just found this - that is so cool. Interesting too to see the contrast between various of the professionally built tube chassis cars - this is executed differently than Glen Jung's car (which I think was a late 90s GTS-3 car) which is executed differently than the Mandeville built car (no idea what class it was for originally) that I last saw being run by Ron Tambourine. Some similarities (they're all now wearing basically the same bodywork) but the suspensions are done differently and yours is the only one I've seen with a transaxle. The Mandeville built car had the fuel tanks in front of the diff too, but was using a quickchange setup for IRS and a conventional style trans.

What's the weight at, do you know?
Kenku is offline  
Old 01-09-17, 06:39 PM
  #65  
Junior Member
 
Join Date: Jan 2017
Location: NorCal
Posts: 17
Likes: 0
Received 0 Likes on 0 Posts
Nice project you got going.
STEMSL007 is offline  
Old 01-09-17, 08:47 PM
  #66  
Senior Member
Thread Starter
 
Join Date: Jan 2006
Location: nanaimo
Posts: 428
Likes: 0
Received 5 Likes on 5 Posts
Glen's car is an older Chassis Dynamics car as far as I can tell . He has done a lot of updates before racing it in Trans Am. It is going on the scales when its back from the body shop. My guess is 1900 pounds.
racingdriver is offline  
Old 01-14-17, 02:26 PM
  #67  
Senior Member
 
Join Date: Mar 2001
Location: Walnut, CA
Posts: 720
Likes: 0
Received 2 Likes on 2 Posts
any info on where to source those hubs? always curious what kind of hubs race car people use.

more info on that FD too !! another build thread?
Alpine is offline  
Old 01-14-17, 08:09 PM
  #68  
Senior Member
Thread Starter
 
Join Date: Jan 2006
Location: nanaimo
Posts: 428
Likes: 0
Received 5 Likes on 5 Posts
The single lug hubs and uprights were machined/ cast by the builder of the car, Bob Cuneo of Chassis Dynamics . He had a molding company build the molds to his design. Unfortunately as IMSA started going towards tub cars in the 90's there was less demand for these and he scrapped them. Riley and other racecar builders generally make their own. Riley wants $40,000 for 4 uprights last time I checked. lol

The silver car is a 1993 rx7 with a 3 rotor turbo, Jerico 5 speed, 14 inch brakes, some aero, and Cobra diff. There are a lot of videos on youtube of this car in action. I've owned it since 1997. Sometimes it feels like it owns me.

Here is a link from Forcefed Racing in Abbotsford , BC that handles all the engine work and tuning of this car. They specialize in rotaries, turbos, tuning, and custom builds.



racingdriver is offline  
Old 01-15-17, 12:55 PM
  #69  
Senior Member
 
Join Date: Mar 2001
Location: Walnut, CA
Posts: 720
Likes: 0
Received 2 Likes on 2 Posts
the FD looks nicely setup !

could you share the suspension setup information on the FD?
Very curious on the spring rate/sway bar/alignment you are running
Alpine is offline  
Old 01-16-17, 11:09 AM
  #70  
Senior Member
Thread Starter
 
Join Date: Jan 2006
Location: nanaimo
Posts: 428
Likes: 0
Received 5 Likes on 5 Posts
The fd set up is as follows.

front

1300 lb spring
1.25 speedway style swaybar
Penske 8300 shocks
3 to 3.3 degrees camber
0 toe

rear

1400 lb spring
disconnected rear bar
Penske 8300 shock
2.4 degrees camber
1/8 total toe in

hoosier a7 tires
racingdriver is offline  
Old 01-16-17, 11:34 AM
  #71  
needs more track time
iTrader: (14)
 
gracer7-rx7's Avatar
 
Join Date: Mar 2006
Location: Bay Area CA
Posts: 7,834
Received 14 Likes on 13 Posts
^don't forget the aero

I believe you have a big wing and splitter?
gracer7-rx7 is offline  
Old 01-17-17, 07:39 PM
  #72  
Senior Member
 
Join Date: Mar 2001
Location: Walnut, CA
Posts: 720
Likes: 0
Received 2 Likes on 2 Posts
thanks ! That's the direction i'm going with my new setup as well, stiff front sway bar, 1/8inch toe in. I'm trying to dial out the power on oversteer characteristics.

I did try no rear sway bar a few years back on another FD (448lb front spring, 336lb rear, stock front swaybar) , but i felt it had too much understeer mid corner.
Did you encounter a similar issue after removing the rear sway bar?


Originally Posted by racingdriver View Post
The fd set up is as follows.

front

1300 lb spring
1.25 speedway style swaybar
Penske 8300 shocks
3 to 3.3 degrees camber
0 toe

rear

1400 lb spring
disconnected rear bar
Penske 8300 shock
2.4 degrees camber
1/8 total toe in

hoosier a7 tires
Alpine is offline  
Old 01-19-17, 09:08 AM
  #73  
Slowly but surely
iTrader: (9)
 
craaaazzy's Avatar
 
Join Date: May 2011
Location: GA
Posts: 1,664
Received 7 Likes on 7 Posts
thanks for sharing...love seeing how actual race cars are built.
craaaazzy is offline  
Old 02-14-17, 06:01 PM
  #74  
Rotary Enthusiast
15 Year Member
 
abeomid's Avatar
 
Join Date: Mar 2001
Location: Vancouver, BC, Canada
Posts: 815
Likes: 0
Received 0 Likes on 0 Posts
Hi Wouter,
Awesome project! I don't check these forums often. Looking forward to seeing this car on the track this year! I have a shop on the north shore doing 3d scanning, fabricating, and CNC milling. We can easily 3d scan those uprights if you need them remade or we can design you a modern upright in aluminum that will outperform those guys and fit the suspension design!

See you at the track!
abeomid is offline  
Old 02-24-17, 10:21 PM
  #75  
Senior Member
Thread Starter
 
Join Date: Jan 2006
Location: nanaimo
Posts: 428
Likes: 0
Received 5 Likes on 5 Posts
We picked up the car from the body shop today. They did an amazing job . Next we install all the little bits and decals
racingdriver is offline  

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: