V8 Roadsters LS3 RX8 Build
#103
I wasn't able to find a set of off the shelf long tube headers that fit. I tried the Hinson, some fbody headers off ebay, borla trailblazer ss and borla cts-v. The cts-v were the closest fit, but they would need to be modified to fit. The steering shaft is in the way of the #3 primary. The Hooker Blackheart mid length headers look like they might fit, but I never tried them. I'm going to have a custom set of 1 7/8 made later this year.
I was just trying to stay with a newer chassis for parts as I am tired of sourcing parts for the 240s we have to keep them working right.
Thanks
#104
I took quick vid of what my exhaust sounds like. Mine might be a little bit more aggressive than yours :D. Audio quality is terrible, but it sounds like a beast in real life.
#105
#107
#108
Stubbs, thanks for the great build thread. I' in the planning stages of my next build. I'm going to stuff an overpowered LS into SOMETHING small, nimble, and can turn.
I'm test driving a rx8 tomorrow to see if my wife likes it enough to take it on a weekend trip. If she does, I've got an rx8 lined up.
I had a couple questions, can you tell us what you did for the steering rack? what able axle shafts? you swapped to a getrag rear, right?
I'm test driving a rx8 tomorrow to see if my wife likes it enough to take it on a weekend trip. If she does, I've got an rx8 lined up.
I had a couple questions, can you tell us what you did for the steering rack? what able axle shafts? you swapped to a getrag rear, right?
#109
Stubbs, thanks for the great build thread. I' in the planning stages of my next build. I'm going to stuff an overpowered LS into SOMETHING small, nimble, and can turn.
I'm test driving a rx8 tomorrow to see if my wife likes it enough to take it on a weekend trip. If she does, I've got an rx8 lined up.
I had a couple questions, can you tell us what you did for the steering rack? what able axle shafts? you swapped to a getrag rear, right?
I'm test driving a rx8 tomorrow to see if my wife likes it enough to take it on a weekend trip. If she does, I've got an rx8 lined up.
I had a couple questions, can you tell us what you did for the steering rack? what able axle shafts? you swapped to a getrag rear, right?
I'm using an aluminium ford 8.8 IRS out of a Lincoln Mark VIII. I rebuilt it with a 31 spline diff to use beefier Cobra style stub shafts from the V8R kit.
#114
The only thing I'm not sure of is what is the bump steer of a stock RX8. I couldn't come up with a stock car to measure at the time.
I haven't put any more effort into it yet as I've been working on my fuel system, and I need to drop the trans and have it rebuilt since the one I got has junk 2nd gear synchros. I'll let you know if I figure anything else out.
#115
Stubbs, you did an awesome job on your build and it's information.
Here's a steal of a bargain if someone wants it... https://kansascity.craigslist.org/cto/5945637481.html
I registered just to pass this along to someone who might actually be interested. Good luck!
Here's a steal of a bargain if someone wants it... https://kansascity.craigslist.org/cto/5945637481.html
I registered just to pass this along to someone who might actually be interested. Good luck!
#117
hey stubbs, may I ask for one favor?
I have non-DSC ABS pump also and need to connect the hydraulic lines to their corresponding calipers. I noticed that you marked your pump in the attached picture. Are you 100% sure of the markings? and am I reading correctly?
F=front port on the master cylinder
R=rear port on the master cylinder out
RL = rear driver side wheel
RR = rear passenger side wheel
FR = front passenger side wheel
FL = front driver side wheel
I ask only because the markings on RX8 ABS pump with DSC are different--their hydraulic lines are routed differently than your markings. Would you clarify?
Thanks man.
I have non-DSC ABS pump also and need to connect the hydraulic lines to their corresponding calipers. I noticed that you marked your pump in the attached picture. Are you 100% sure of the markings? and am I reading correctly?
F=front port on the master cylinder
R=rear port on the master cylinder out
RL = rear driver side wheel
RR = rear passenger side wheel
FR = front passenger side wheel
FL = front driver side wheel
I ask only because the markings on RX8 ABS pump with DSC are different--their hydraulic lines are routed differently than your markings. Would you clarify?
Thanks man.
#121
good afternoon sir, was wondering if you could help me, I am trying to wire the ac and cant seem to find a signal from the a/c selector on/off switch .i thought the red and white wire from the a/c amplifier would work but i am not getting any signal .thank you for any help, danny smith
#122
It's been a while since I did the A/C wiring so I had to look back over my notes. I believe the red/white wire coming from the a/c amp is a ground signal. The way I have it set up in my car is red/white running to the green/black on the a/c relay. From the black/yellow on the a/c relay going to the red/white on the refrigerant pressure switch then out the light blue/black wire to the compressor clutch. The red/black wire goes to my high amp relays that control my cooling fans, black goes to ground. Pressure switch controls everything, kicks the compressor in and out as needed, and kicks the fans on as needed.
I don't precisely remember why I did it this way, I think it had to do with the routing of the existing harness wiring and the new location of the pressure switch.
I've been thinking of redoing it to have the LS ecu control the compressor as it gives better control over fan run time and compressor overspeed control, but I've got other projects on my plate and it works fine as is.
I don't precisely remember why I did it this way, I think it had to do with the routing of the existing harness wiring and the new location of the pressure switch.
I've been thinking of redoing it to have the LS ecu control the compressor as it gives better control over fan run time and compressor overspeed control, but I've got other projects on my plate and it works fine as is.
#123
Hi Stubbs, was just wondering how the rim/tire combo is working for you? Did you have to do any mods to make them fit?
Do you have any rubbing or any other problems? I assume you lowered the car, do you have any alignment specs? Thanks
Do you have any rubbing or any other problems? I assume you lowered the car, do you have any alignment specs? Thanks
#124
No fitment issues in the rear, plenty of clearance. I lightly rolled the rear fenders, but it wasn't needed.
Front cleared the fender lip without issue. However, the clearance between the control arm and inside of the wheel is tight at full lock. Mine would just barely rub the inside lip at right full lock, but not left. I found the original alignment wasn't done properly and the tie rod lengths weren't equalized after toe was set. This made the right tie rod assembly effectively longer than the left which is why the right side rubbed and not the left. With corrected tie rod lengths it might just barely touch.
The car is lowered, but not slammed. I don't remember off the top of my head what the measured height was, probably about 1-1.5" lower than stock
Current alignment is 2º front camber 1.5º rear camber, 6.25º caster, 0 toe front and rear.
If you have the V8roadsters sub-frame double check your rear lower control arm. The pocket that the control arm sits in isn't as deep as the OEM sub-frame so if you dial in too much caster the back of the control arm around the bushing will press against the back of the pocket and cause a clanking noise and cause some funky alignment issues. 6.25º is about as much as I could get while having a reasonable amount of clearance.
Front cleared the fender lip without issue. However, the clearance between the control arm and inside of the wheel is tight at full lock. Mine would just barely rub the inside lip at right full lock, but not left. I found the original alignment wasn't done properly and the tie rod lengths weren't equalized after toe was set. This made the right tie rod assembly effectively longer than the left which is why the right side rubbed and not the left. With corrected tie rod lengths it might just barely touch.
The car is lowered, but not slammed. I don't remember off the top of my head what the measured height was, probably about 1-1.5" lower than stock
Current alignment is 2º front camber 1.5º rear camber, 6.25º caster, 0 toe front and rear.
If you have the V8roadsters sub-frame double check your rear lower control arm. The pocket that the control arm sits in isn't as deep as the OEM sub-frame so if you dial in too much caster the back of the control arm around the bushing will press against the back of the pocket and cause a clanking noise and cause some funky alignment issues. 6.25º is about as much as I could get while having a reasonable amount of clearance.