SSM RX7 Build

[Rotary Afterfire]

I see that you said that you are relocating your wastegates...any idea of what you are going to do to them? Just extend the runners rearward?

[cturbo28]

Originally Posted by Rotary Afterfire

I see that you said that you are relocating your wastegates...any idea of what you are going to do to them? Just extend the runners rearward?

Yea, I missed the question.

First I am going to water cool them and see if that helps. I currently have the rear wastegate wrapped with heat shielding but it still melts the diaphragm. My plan is to pull the engine soon for a swap and investigate what I can do to help the issue. I really do not have a good fix at this time nor do I want to re make the manifold or DP.

[Rotary Afterfire]

Originally Posted by cturbo28

Yea, I missed the question.

First I am going to water cool them and see if that helps. I currently have the rear wastegate wrapped with heat shielding but it still melts the diaphragm. My plan is to pull the engine soon for a swap and investigate what I can do to help the issue. I really do not have a good fix at this time nor do I want to re make the manifold or DP.

ok, since Im going to be fabricating kind of based on what you have, I was interested in what you were going to do to remedy the diaphragm problem. Perhaps bringing the front w/g forward off the runner towards the headlights and extending the dump-to-dp pipe to the same location and extending the rear w/g rearward and have it dump further down in the dp. Hopefully water-cooling will help and I can copy that too lol. Good luck.

[speedjunkie]

Originally Posted by cturbo28

See above post on WG answer. On the exhaust, I really do not know if welding the two different types hurt anything but I have not had any problems so far. the breakdown of the material is this.

1. Manifold 321ss
2. 3" vband 304ss
4. 3" to 3.5 transition 321ss
5. DP 3'5" 321ss
6. flex joint 304 ss
7. 3.5 to 4" transition 321ss
8. 4" straight section 26"s, 321ss (removable to be straight or Magna flow)
9. 4" from #8 back to Magna flow in rear 409ss

My plan was to run 20 ga. 321 all the way back but it was hard to justify the cost to material advantage.

On the IC, my intake temps get a little high. 145F-175F range during a race on a 90+ degree days. Not sure if it is the IC or the nature of the beast. I usually run 19-21psi so the intake temps get up there. The example I pulled up happened to be a little cooler day might have been 80 degrees at the most. not really sure.

The stock twins are no comparison to the single I have on it now. Best way I can explain it is it would be the difference in a C6 Z06 compared to a stock RX-8.

OK gotcha, so you already made a heat shield and still doesn't help. Well, shit. I guess water and/or relocation is the only choice then. Have you ever wrapped the DP as well to try to help with that or is it against the rules?

I'm not sure how you kept all those materials and locations straight in your mind haha, but thanks for the info! I thought you went straight from the Vband on the turbo to a 4" DP. Gotcha. And I can completely understand not doing the whole thing in 321ss, not worth the benefit vs cost. Was there a specific reason you got an RB flange? Someone else suggested getting that one too but I don't yet know why. I'll get it anyway though, no biggie.

As far as the cooling efficiency of the IC, I've never measured my temps so I wouldn't know how they compare to yours, but I know current VMIC works pretty well as far as cooling. I just think I might be able to get less pressure drop with something with smoother flowing end tanks. Then comes the problem of the air moving too fast to be cooled efficiently...and for that I was going to use 2.75" exit and 3" entrance piping. But flow/CFM is where I'm stuck right now. Not that it really matters, I'm not racing, just trying to give my all to build my favorite street car haha. MAYBE it'll see the track someday, but I've never paid attention to rules and regulations so I'm so far past it now and it's not worth going back.

So you're saying the single responds faster than the stock twins? Or are you talking just about the power it delivers? I didn't think any single would respond as fast as the twins. I was hoping short runners and an efficient IC would help though.

Sorry for all the questions, but thanks for responding anyway.

Originally Posted by Rotary Afterfire

ok, since Im going to be fabricating kind of based on what you have, I was interested in what you were going to do to remedy the diaphragm problem. Perhaps bringing the front w/g forward off the runner towards the headlights and extending the dump-to-dp pipe to the same location and extending the rear w/g rearward and have it dump further down in the dp. Hopefully water-cooling will help and I can copy that too lol. Good luck.

I think only the rear WG was being affected though, since he mentioned it being close to the DP. I'm curious how the front is working too though.

[cturbo28]

Originally Posted by Rotary Afterfire

ok, since Im going to be fabricating kind of based on what you have, I was interested in what you were going to do to remedy the diaphragm problem. Perhaps bringing the front w/g forward off the runner towards the headlights and extending the dump-to-dp pipe to the same location and extending the rear w/g rearward and have it dump further down in the dp. Hopefully water-cooling will help and I can copy that too lol. Good luck.

Cool, glad to see another fabricator. just stay tuned to the thread and I will let you know how the relocation goes and or the cooling. My racing season starts in March so I need to do something before then.

Originally Posted by speedjunkie

OK gotcha, so you already made a heat shield and still doesn't help. Well, shit. I guess water and/or relocation is the only choice then. Have you ever wrapped the DP as well to try to help with that or is it against the rules?

I'm not sure how you kept all those materials and locations straight in your mind haha, but thanks for the info! I thought you went straight from the Vband on the turbo to a 4" DP. Gotcha. And I can completely understand not doing the whole thing in 321ss, not worth the benefit vs cost. Was there a specific reason you got an RB flange? Someone else suggested getting that one too but I don't yet know why. I'll get it anyway though, no biggie.

As far as the cooling efficiency of the IC, I've never measured my temps so I wouldn't know how they compare to yours, but I know current VMIC works pretty well as far as cooling. I just think I might be able to get less pressure drop with something with smoother flowing end tanks. Then comes the problem of the air moving too fast to be cooled efficiently...and for that I was going to use 2.75" exit and 3" entrance piping. But flow/CFM is where I'm stuck right now. Not that it really matters, I'm not racing, just trying to give my all to build my favorite street car haha. MAYBE it'll see the track someday, but I've never paid attention to rules and regulations so I'm so far past it now and it's not worth going back.

So you're saying the single responds faster than the stock twins? Or are you talking just about the power it delivers? I didn't think any single would respond as fast as the twins. I was hoping short runners and an efficient IC would help though.

Sorry for all the questions, but thanks for responding anyway.

e

I think only the rear WG was being affected though, since he mentioned it being close to the DP. I'm curious how the front is working too though.

I was planning to do 3.5" all the way back but I changed my mind half way through the project. No reason, that is just the way it turned out. Also I would not bother with over thinking the IC, we are not building F1 cars. Just get what fits and build it. Over analyzing things will just slow you down.

I will post my dyno chart and let you figure out if the twins are better. Although for a street car I would get a bigger turbo like a GT35 or so. The street is another world compared to auto crossing.

[Brent]

Originally Posted by cturbo28

Also I would not bother with over thinking the IC, we are not building F1 cars. Just get what fits and build it. Over analyzing things will just slow you down.

Truer words have never been spoken

[cturbo28]

Originally Posted by Rotary Afterfire

ok, since Im going to be fabricating kind of based on what you have, I was interested in what you were going to do to remedy the diaphragm problem. Perhaps bringing the front w/g forward off the runner towards the headlights and extending the dump-to-dp pipe to the same location and extending the rear w/g rearward and have it dump further down in the dp. Hopefully water-cooling will help and I can copy that too lol. Good luck.

I have been studying my waste gate issue and I am pretty confident I have figured out the problem. I still plan to run coolant though them since I have water cooled waste gates but I do not think they are getting over heated. The cause that I have figured out is that I was using the Anti lag function on the Haltech and that was the cause of the burned up waste gates.

here is what I have thought about.

1. I raced my car for half a season with out any issues.
2. I used the Anti lag launch function at a couple of races mid way through the season.
3. Next race blown waste gates. I repaired the waste gates after I found the problem. unfortunately I raced at the Toledo Ohio Solo with low boost as a result.
4. New waste gates installed for Nationals, first day of Pro Solo ( using ALS ), resulted in low boost for second day. I finished third but maybe the Low boost helped more than hurt.
5. Turned ALS off for good after that and I have not had an issue since. Also the waste gate that had the most damage was the rear one. Yes, it is closest to the exhaust but it also has the most direct "straight" path from the exhaust.

Haltech has a disclaimer on using the ALS they should ad "will destroy waste gates"

Also added more pictures for ABS, Diff brace and exhaust tip.

[calculon]

Originally Posted by cturbo28

...

Also added more pictures for ABS, Diff brace and exhaust tip.

As a part of the relocation, did you separate out the ABS ECU, or is it still incorporated into the full body harness as from the factory? Supposing the latter, do you have any intention of separating it out and removing all that excess factory body harness for weight savings/wiring replacement and simplification?

Thanks again for sharing so much of your build. Good luck with the continued project.
-ryan

[cturbo28]

Originally Posted by calculon

As a part of the relocation, did you separate out the ABS ECU, or is it still incorporated into the full body harness as from the factory? Supposing the latter, do you have any intention of separating it out and removing all that excess factory body harness for weight savings/wiring replacement and simplification?

Thanks again for sharing so much of your build. Good luck with the continued project.
-ryan

Yes, it is still incorporated in the harness, I do not have any intention on doing anything else to it since it is working.

[cturbo28]

I started making a new oil fill neck that I will ad a catch can to later for my vented PCV set up. Also I am trying to get ready to dyno this weekend. I will try and update everything before my dyno tuning session. I also added a picture of my two helpers.

[jkstill]

Originally Posted by cturbo28

I currently have the rear wastegate wrapped with heat shielding but it still melts the diaphragm.

Have you considered Synapse Synchronic wastegates?

My understanding is they do not use a diaphragm, so maybe there is less of a heat issue with them.