Strokercharged95GT 13b-REW Build - Page 7 - RX8Club.com



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Old 08-12-2017, 08:42 AM   #151
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thanks!

Just an update. I have been racking my brain over the whole surge tank. I really do not want to mount my surge tank and fuel pump in my trunk that also houses the battery. There is something about having fuel components in the sealed trunk that is a little uneasy. I have decide to cutout the lower sump portion of the trunk to make room for a tray to mount the outside fuel components. The tray will be welded to the driver frame rail. Also I would rather have a loud fuel pump outside of the car than in it. Once the install is complete, I will seal the trunk with a piece of sheet aluminum. So the lower part of my trunk and the oem muffler area will be the mounting for these components. So last night I moved the muffler over the passenger side of the car, only took one cut and two mandrel bent tubes. I figured I want to keep hot exhaust on the passenger side only and the fuel system on the driver side only.

I fabricated up a piece of squared tubing to make the tray that will mount behind the car. It looks like the surge tank will be about 6-7 inches from the exhaust canister, is that enough? I would like to mount the fuel pump to the left of the surge tank. So far I'm like $45 in it for the surge tank and $20 in it for the piece of squared tubing. The tray is only tacked for now and will eventually be approximately 4-6 inches higher than it looks in the picture below. I am still looking for the best way to run all four fuel lines forward. If anyone have any suggestions on mounting location or design, please feel free to comment as I would like to get it right the first time.






Last edited by strokercharged95gt; 08-12-2017 at 08:49 AM.
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Old 08-21-2017, 10:37 AM   #152
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Update

Got the S2 fuel pump and housing installed. Pump tested fine. Fuel gauge works. Since the stock fuel pump will easily flow enough to keep the surge tank topped off, I decided it would be better to use that pump as it will generate less heat than the Aeromotive 340 lph. I installed the surge tank and dual fuel pump mounts along the driver side frame rail. I ordered a single Bosch 044 external fuel pump from a reputable company so it shouldn't be a knockoff. At about 55-60 psi fuel pressure and above, it will outflow the Aeromotive pump anyway (also produce less heat/require less power). The surge tank has an additional bung for a second fuel pump and I got a dual pump mount so any future upgrade to a second pump will be easy. I have run the lines from the main tank to the surge tank, but am waiting on some additional fuel hose to complete the feed and return to the motor. All of the fuel lines will be mounted outside of the passenger compartment.

Just need to finish up a coup of hoses and install the 10 AWG relay for fuel pump and should be firing the motor up within a week. I have also left space behind the fuel component tray in case I need to put a heat exchanger on the return line. As stated before, on my previous setup my pressure would get worse and worse as I drove the car longer and longer. I was not sure if it was a pickup problem or the fuel was getting too hot and boiling inside of the lines. You can imagine after 45 minutes of the same fuel be recirculated through the hot fuel rail and being returned to the tank would be less than ideal. I am hoping that this will be my last issue so I can push the motor above 18-20 psi. More updates to come.

Total costs so far $230 for pump, $45 for surge tank, $30 for steel mount, $110 for used S2 pump and assembly, $50 for fuel assembly ring, and gonna be about $150 for hose and fittings.





Almost There



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Old 09-05-2017, 07:22 PM   #153
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Update: Fuel system complete. Surge tank never drops. Fuel pressure is exactly where it should be, was around 52 psi at 12 psi on the turbo. I also added a 10 micron fuel filter between the pump and the fuel rail. I now have to pull a bunch of fuel out of the map about 5,000 RPMs to fix the rich AFRs. The Bosch 044 is loud, but not obnoxious. If I ever need more pump, I can easily add a second fuel pump and connect the relay to my water injection pump, which kicks in at 9 psi. I Should have just got the polished surge tank as the slightest fuel touching the surface has stained it (I wanted it to be as low profile as possible). Time to try and blow this thing up now.





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Old 09-05-2017, 08:30 PM   #154
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holy crap, better have a good insurance policy in the event you get rear ended
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Old 09-05-2017, 09:07 PM   #155
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holy crap, better have a good insurance policy in the event you get rear ended
If I'm rear ended and the rear crash beam gets pushed into the middle of the trunk, I'm gonna have more problems than insurance
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Old 09-05-2017, 10:07 PM   #156
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I'd be more worried about exhaust heat and the potential for a leak to end up on the exhaust.

I have an 044 as well...and it does sound a bit like a blender...but haven't had fuel delivery issues up to 550whp with just a single pump on E85. You should be good with gasoline
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Old 09-05-2017, 11:46 PM   #157
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It just looks really exposed to potential damage, but maybe the pic doesn't do it justice.
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Old 09-07-2017, 07:24 AM   #158
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It just looks really exposed to potential damage, but maybe the pic doesn't do it justice.
From the one picture it looks like its poking out and vulnerable, but its actually 6 inches behind the rear crash beam. Its located where the stock muffler would be located on the driver side. I have seen people in the mustang community mount their external pump to the outside of the crash beam, which I always thought was crazy.

As for the exhaust pipe, that is also about 6-7 inches away from the surge tank. I am going to add a layer of heavy exhaust wrap on the exposed pipe near the tank as insurance. I took the car out yesterday and did some tuning at 12 psi. I was logging pulls from 3-7k with AFR ratios all between 10.8-11.2 with no spikes of any kind. The new fuel system is making tuning way more consistent. I feel like the past months of tuning have all been wasted now.

My plan for now it to get it tuned back up to 20 psi. I still have a 5-speed transmission sitting on my garage floor ready to go in. Maybe will have to do some motor upgrades when the tranny comes out.
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Old 09-07-2017, 07:35 AM   #159
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20 psi should get you up in the 570hp range I would think. Your 6 speed will last one really good pull 😎
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Old 09-07-2017, 11:30 AM   #160
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https://www.rx8club.com/rotary-swaps...8/#post4834974

in addition to the adapter, they also have a steel scattershield bellhousing option listed
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Old 09-07-2017, 02:28 PM   #161
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https://www.rx8club.com/rotary-swaps...8/#post4834974

in addition to the adapter, they also have a steel scattershield bellhousing option listed
I still have the 5-speed rx8 tranny and an FD tranny on my garage floor that I need to go through before moving to a Tremec.

While the transmission is out, I'm wondering if I should just bite the bullet and upgrade to a Turblown stud kit and throw some Goopy or RA seals in the motor for insurance. I'd rather spend 1k now than 3k later. Even with methanol/WI and a safe tune, will the stock studs and atkins seals hold?
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Old 09-07-2017, 02:37 PM   #162
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I still have the 5-speed rx8 tranny and an FD tranny on my garage floor that I need to go through before moving to a Tremec.

While the transmission is out, I'm wondering if I should just bite the bullet and upgrade to a Turblown stud kit and throw some Goopy or RA seals in the motor for insurance. I'd rather spend 1k now than 3k later. Even with methanol/WI and a safe tune, will the stock studs and atkins seals hold?

So far I haven't had a problem with the RX-8 5 speed with around 500whp. If it die's just swap in the bellhousing and tailshaft on the FD center section and you are good again

Personally not a big Atkins seal fan...but unless you start loosing compression don't see a lot of point in redoing the short block
At that HP level the block should be plenty strong enough. A crappy tune will kill it real quick...but making the studs/block stronger wont help the motor survive that anyway. I have seen 1000hp 2 rotors with almost no block changes survive well....and "fully" dowelled and studded blocks break at 500 or less.

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Old 09-07-2017, 08:07 PM   #163
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Well I blew one up in an FD3 at much lower power, but I forget not everyones as ham-fisted as me when it comes to shifting, lol
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Old 09-07-2017, 08:30 PM   #164
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Well I blew one up in an FD3 at much lower power, but I forget not everyones as ham-fisted as me when it comes to shifting, lol

LOL. You do seem to have a knack for that. Autocross is hard on transmissions though....Road racing it's easier to be a bit smoother shifting
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Old 09-08-2017, 07:20 PM   #165
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FL

Took the car out today, and did some tuning up to 18 psi. With the steady fuel pressure, I am able to keep the AFR between 10.7-11.0 throughout the majority of the pull. Car feels really fast, wasn't able to run it out to 8k as I has some obstructions on my closed private road. I am making 10 psi by about 4,300 on this run, and full boost by 5,000 (total timing around 14). I may have to stack both the high and low spring in the wastegate to build boost a little sooner (mac valve starts fluctuating at 8 psi). Its not terrible that the boost doesn't all hit at once as it helps keep the tires planted.

Here is a log of a 3rd gear pull.



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