Apollo Racer Build Thread, Numeric 981 Shifter Upgrade Options

[76-914]

Yeah, I need to quieten mine down which means I'll be doing what you are, shortly. Which means more 90's and more muffler. I'll miss the HP but not the noise. Is that a 4" or 6" radius J bend ( or U bend ) that you cut down? Alumanized or SS? Looks good!

[rnellums]

Yeah, I need to quieten mine down which means I'll be doing what you are, shortly. Which means more 90's and more muffler. I'll miss the HP but not the noise. Is that a 4" or 6" radius J bend ( or U bend ) that you cut down? Alumanized or SS? Looks good!

Aluminized remnant bends complements or Marty over at MSDS! Super great guy to work with! I used 90 deg. elbows, but i'm not sure what the radius was. looks to be about 4" from the center to the outside.

[Maltese Falcon]

Yeah, I need to quieten mine down which means I'll be doing what you are, shortly. Which means more 90's and more muffler. I'll miss the HP but not the noise. Is that a 4" or 6" radius J bend ( or U bend ) that you cut down? Alumanized or SS? Looks good!

Aluminized remnant bends complements or Marty over at MSDS! Super great guy to work with! I used 90 deg. elbows, but i'm not sure what the radius was. looks to be about 4" from the center to the outside.

Thanks for the comments ! the radius is 4. In the header business, big radius won't get you in + out of tight places (IMG:style_emoticons/default/welder.gif)
I even do some 1-D bending on special order. 1-D is when the diameter (od) of the tube=the same numerical radius ; example a 3" tube mandrel -bent on a 3 R .
Marty

[mgp4591]

Great looking welds- look forward to the progress on this! (IMG:style_emoticons/default/popcorn[1].gif)

[rnellums]

I finished up the flanges and the muffler sub pipes. With the 6" race mufflers on there it is still WAY to loud for every day driving. I have got some larger mufflers now on order to test and see if I can improve the noise level a bit!

[scotty b]

Marty or anyone have experience with the Flowmaster " hushpowers " ? they look fairly small and compact which worries me they may be excessively restrictive if they run as quiet as they do (IMG:style_emoticons/default/confused24.gif)


https://www.youtube.com/watch?v=tH_2PFNmWog



https://www.youtube.com/watch?v=Zd4e8htvEfc

[scotty b]

Nevermind. Apparently they aren't recommended for 4&6 cylinder cars (IMG:style_emoticons/default/sad2.gif)

[rnellums]

Nevermind. Apparently they aren't recommended for 4&6 cylinder cars (IMG:style_emoticons/default/sad2.gif)

I wonder why?

[Amenson]

I finished up the flanges and the muffler sub pipes. With the 6" race mufflers on there it is still WAY to loud for every day driving. I have got some larger mufflers now on order to test and see if I can improve the noise level a bit!

Turbo's are very good at sound attenuation (IMG:style_emoticons/default/stirthepot.gif) (IMG:style_emoticons/default/poke.gif)

[Chris H.]

Turbo's are very good at sound attenuation (IMG:style_emoticons/default/stirthepot.gif) (IMG:style_emoticons/default/poke.gif)

That's what Bob used to say a lot...also another minor reason he went to the EZ30. More room for the turbo stuff.

Speaking of Bob...Ross if you can pull it off you should add a center muffler like Bob's. That might help quiet it all down. His is very quiet unless you step on it, and even then it's not obnoxious. I can relate to the challenges of the cradle setup.



He used a tubular muffler and added two exhaust ports, although if the Camaro-style 2-in-2 out setup could be used (rotated so that it fits) go for that.

[rnellums]

Speaking of Bob...Ross if you can pull it off you should add a center muffler like Bob's. That might help quiet it all down. His is very quiet unless you step on it, and even then it's not obnoxious. I can relate to the challenges of the cradle setup.



He used a tubular muffler and added two exhaust ports, although if the Camaro-style 2-in-2 out setup could be used (rotated so that it fits) go for that.

With the bellcrank cable shift setup there isn't much room behind the transmission. I might be able to get away with the center outlet though.. plus it will look great!

[Maltese Falcon]

Worth looking into for small compact "Turbo profile" mufflers:
Spintech brand.
These come in all sorts of small medium and large sizes. Excellent noise control, without excessive backpressure. Patented chamber design+NO packing to disintegrate. We are currently using these on the Fiat 500 Abarth cat back with good results (IMG:style_emoticons/default/driving.gif)
Marty

[76-914]

Thx for that tip, Marty. I'm going check this out. Currently re-designing my exhaust system, also. (IMG:style_emoticons/default/beerchug.gif)

[914forme]

Great Tip Marty, Now to build some cardboard mock ups and go to town finding a place to fit them.

[rnellums]

So, while I'm waiting for some new exhaust parts to come in I'm thinking about working on how to flip my intake manifold. I have seen it done on the EZ30R's (plastic manifold) but never the EZ30D.

It seems to me that the first headache are the upper coolant pipes which have a physical interference with the intake when flipping it on the 30D. I have given the stock coolant routing diagram below:


My question is, can I eliminate the coolant pipe (and heater core return pipe) all together? (diagram below)


I would also lose the throttle body heater, but I don't feel like that's an issue unless I'm driving in freezing conditions often (not likely).

The only downside I can see is that it looks like during warm up (t-stat closed) the coolant flows through the heater core, bypassing the thermostat.

I would have to drill a larger bypass hole in the thermostat to compensate, which would slow engine warm up time.

Perhaps it would be better to only delete the throttle body heater and run a flexible hose in place of the coolant pipe? (diagram). What is the consensus World?

[Maltese Falcon]

Great Tip Marty, Now to build some cardboard mock ups and go to town finding a place to fit them.

Spin tech should have physical muffler dimensions and diagrams of inlet / outlet positions /offsets on their site.

[veekry9]

This is great work and journaling,but I gotta "pipe"up. (IMG:style_emoticons/default/biggrin.gif)


https://www.youtube.com/watch?v=O1bXPNy1Yn4


http://www.superstreetonline.com/how-to/af...xhaust-systems/14K for a nice header? (IMG:style_emoticons/default/blink.gif)

I hope this helps in some way toward building a better header with more clearance and performance in evacuating 500cc cylinders.
The oval ex ports pose a challenge to avoid a bottleneck close to the flange.

[rnellums]

This is great work and journaling,but I gotta "pipe"up. (IMG:style_emoticons/default/biggrin.gif)

http://www.superstreetonline.com/how-to/af...xhaust-systems/14K for a nice header? (IMG:style_emoticons/default/blink.gif)

I hope this helps in some way toward building a better header with more clearance and performance in evacuating 500cc cylinders.
The oval ex ports pose a challenge to avoid a bottleneck close to the flange.

That was a good vid! Thanks!

It eally reminds me of how much I need to get a "Baseline" read on my engine so I know if the changes I'm making are helping or hurting!

[mgp4591]

So, while I'm waiting for some new exhaust parts to come in I'm thinking about working on how to flip my intake manifold. I have seen it done on the EZ30R's (plastic manifold) but never the EZ30D.

It seems to me that the first headache are the upper coolant pipes which have a physical interference with the intake when flipping it on the 30D. I have given the stock coolant routing diagram below:


My question is, can I eliminate the coolant pipe (and heater core return pipe) all together? (diagram below)


I would also lose the throttle body heater, but I don't feel like that's an issue unless I'm driving in freezing conditions often (not likely).

The only downside I can see is that it looks like during warm up (t-stat closed) the coolant flows through the heater core, bypassing the thermostat.

I would have to drill a larger bypass hole in the thermostat to compensate, which would slow engine warm up time.

Perhaps it would be better to only delete the throttle body heater and run a flexible hose in place of the coolant pipe? (diagram). What is the consensus World?

You may end up with some really funky idle problems deleting that connection regardless of the weather. That usually results in the surging sound you hear on some cars when they're idling and your mileage may drop- it controls a few different functions as I recall... it may work okay but I'd be skeerd...

[rnellums]

You may end up with some really funky idle problems deleting that connection regardless of the weather. That usually results in the surging sound you hear on some cars when they're idling and your mileage may drop- it controls a few different functions as I recall... it may work okay but I'd be skeerd...

My feeling is there there is very little flow through the throttle body currently anyways, as it usually depends on the pressure drop across the heater core to drive the flow. Without the heater core making a pressure differential, there is not reason to flow through the throttle body instead of around it.