"Hymee" Catback fitted - Pics
12-17-2003, 02:38 AM
#26
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Hymee
Is there a weight difference between stock exaust system and the hymee exaust ?
Do you no what this may be ?
Will the cheaper aluminised- mild steel system give same power output as the stainless steel one?
michael
Is there a weight difference between stock exaust system and the hymee exaust ?
Do you no what this may be ?
Will the cheaper aluminised- mild steel system give same power output as the stainless steel one?
michael
12-17-2003, 02:50 AM
#27
Good question L&L.
We didn't weight the whole lot, but the stock unit was heavy.
The rear pipe would be much the same. I'd reckon the muffler assy would be lighter.
There should be no difference in performace between the SS and MS. They will be manufactured using the same methods. The design of the mufflers will be the same non-restrictive design. Just a difference in materials.
I personally believe all the cat backs would be within a bee's dick of each other in performance if they are built right. The bulk of the performance in the exhaust will come from a better mid pipe, and headers. The Hymee Exhaust Stage II (Mid pipe) will have a hi-flow cat, so as to retain legality for street use.
Cheers,
Hymee.
We didn't weight the whole lot, but the stock unit was heavy.
The rear pipe would be much the same. I'd reckon the muffler assy would be lighter.
There should be no difference in performace between the SS and MS. They will be manufactured using the same methods. The design of the mufflers will be the same non-restrictive design. Just a difference in materials.
I personally believe all the cat backs would be within a bee's dick of each other in performance if they are built right. The bulk of the performance in the exhaust will come from a better mid pipe, and headers. The Hymee Exhaust Stage II (Mid pipe) will have a hi-flow cat, so as to retain legality for street use.
Cheers,
Hymee.
Last edited by Hymee; 12-17-2003 at 04:49 AM.
12-17-2003, 03:11 AM
#28
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Hymee
I have read that the TITANIUM exhaust system had an incredible weight saving of approximately 20lbs over the stock exhaust.
The down side is the 3-to 1 expense conponent over stainless steel .
By the way i never knew bees had dicks ? your eyesight is definetely a lot better than mine , did you make this observation while they had a hard on ?ha ha ha. or were they flying past you flashing .?
Will the Aluminised / mild steel exhaust be able to handle the extra heat from the hymee stage 11 system with the mid pipe and the high flow cat? What is their life span ?
Michael
I have read that the TITANIUM exhaust system had an incredible weight saving of approximately 20lbs over the stock exhaust.
The down side is the 3-to 1 expense conponent over stainless steel .
By the way i never knew bees had dicks ? your eyesight is definetely a lot better than mine , did you make this observation while they had a hard on ?ha ha ha. or were they flying past you flashing .?
Will the Aluminised / mild steel exhaust be able to handle the extra heat from the hymee stage 11 system with the mid pipe and the high flow cat? What is their life span ?
Michael
12-17-2003, 04:27 AM
#29
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[aside]
on the way home from work tonight, I passed through the Adelaide CBD and stopped off at a specialist high performance exhaust shop [name supressed].
I should have worked out something was wrong as the place was full of commodores and WRX's. The shop I went to earlier today (which I have been recommended to by multiple sources) had a 350z, and 67ish Pontiac GTO and a Boxter S being worked on.
Anyway, the place with the commodores had a smarmy sales guy/manager who was obviously thinking he could pull a fast one on me. A stylised conversation follows :
"I''ve got an RX8 (pointing out window) and would like to know if you've done any work on one yet?"
"Sure, we've done two"
"Well, I'm interested in getting a cat-back exhaust fitted and I'm just exploring my options"
"[sales pitch]"
Anyway, the guy goes on to say some stuff about how turbo models like mine need this and that. Hmmm ... the Rx8 is a turbo? Surely he would know it was normally aspirated if he had worked on two cars?
"Dyno tests show ..."
I pointed out that the ECU stuffs the dyno tests.
He said he had an override program to stop the ECU reading wrong.
That's when I walked out the door ...
on the way home from work tonight, I passed through the Adelaide CBD and stopped off at a specialist high performance exhaust shop [name supressed].
I should have worked out something was wrong as the place was full of commodores and WRX's. The shop I went to earlier today (which I have been recommended to by multiple sources) had a 350z, and 67ish Pontiac GTO and a Boxter S being worked on.
Anyway, the place with the commodores had a smarmy sales guy/manager who was obviously thinking he could pull a fast one on me. A stylised conversation follows :
"I''ve got an RX8 (pointing out window) and would like to know if you've done any work on one yet?"
"Sure, we've done two"
"Well, I'm interested in getting a cat-back exhaust fitted and I'm just exploring my options"
"[sales pitch]"
Anyway, the guy goes on to say some stuff about how turbo models like mine need this and that. Hmmm ... the Rx8 is a turbo? Surely he would know it was normally aspirated if he had worked on two cars?
"Dyno tests show ..."
I pointed out that the ECU stuffs the dyno tests.
He said he had an override program to stop the ECU reading wrong.
That's when I walked out the door ...
12-17-2003, 07:05 AM
#32
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Originally posted by dbb
"I''ve got an RX8 (pointing out window) and would like to know if you've done any work on one yet?"
"Sure, we've done two"
"Well, I'm interested in getting a cat-back exhaust fitted and I'm just exploring my options"
"[sales pitch]"
Anyway, the guy goes on to say some stuff about how turbo models like mine need this and that. Hmmm ... the Rx8 is a turbo? Surely he would know it was normally aspirated if he had worked on two cars?
"Dyno tests show ..."
I pointed out that the ECU stuffs the dyno tests.
He said he had an override program to stop the ECU reading wrong.
That's when I walked out the door ...
"I''ve got an RX8 (pointing out window) and would like to know if you've done any work on one yet?"
"Sure, we've done two"
"Well, I'm interested in getting a cat-back exhaust fitted and I'm just exploring my options"
"[sales pitch]"
Anyway, the guy goes on to say some stuff about how turbo models like mine need this and that. Hmmm ... the Rx8 is a turbo? Surely he would know it was normally aspirated if he had worked on two cars?
"Dyno tests show ..."
I pointed out that the ECU stuffs the dyno tests.
He said he had an override program to stop the ECU reading wrong.
That's when I walked out the door ...
Getting back on topic, I went out tonight and tried to spit flames out the back of the exhaust, but I didn't have any luck. I gave it a good shot too.... drove it really hard and kept the revs high for about 15 minutes prior. But no flames (some would say that's a good thing). It sounded pretty good trying though!
12-17-2003, 07:41 AM
#33
Forgive me lord, for I have sinned. 
Wildcard - we forgot to put the extra fuel dumps into the mid pipe
Actually thinking about it a bit more...
I always remeber how wowed I was when I first saw race cars spitting flames on the overrun. First it was RE RX-3's and 4s at Lakeside - I took a good photo once (mental note to self - scan that old print in and post it!), then the Turbo Sierra's. Then to my absolute delight the V8 supercars (or maybe it was the last of the Group A's???) started to do it as well.
Some other food for thought. It sounds OK to me at this time of night
Cheers,
Hymee.
Wildcard - we forgot to put the extra fuel dumps into the mid pipe
Actually thinking about it a bit more...
- Didn't the US guys reckon you could do that with the stock exhaust? Has anyone done it here?
- The US cars have a different tune - lots richer, remember! Why do they make it richer - to dump more unburnt fuel over the cats. What is that unburnt fuel is eventually ignited downstream?
I always remeber how wowed I was when I first saw race cars spitting flames on the overrun. First it was RE RX-3's and 4s at Lakeside - I took a good photo once (mental note to self - scan that old print in and post it!), then the Turbo Sierra's. Then to my absolute delight the V8 supercars (or maybe it was the last of the Group A's???) started to do it as well.
Some other food for thought. It sounds OK to me at this time of night
Cheers,
Hymee.
12-17-2003, 07:42 AM
#34
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Hymee, well done! Wildcard - good on you for being the guinea pig!
Is a midpipe (no cat) in the works at any stage? That would sure be applealing.
Also, how loud is loud ?
Is a midpipe (no cat) in the works at any stage? That would sure be applealing.
Also, how loud is loud ?
12-17-2003, 07:48 AM
#35
Hey KAS!,
The Hymee Mid Pipe will have a hi-flow cat and be street legal. And it won't need any O2 trickery. I don't believe in fooling the computer. (well - maybe into thinking the wheels are spining on a dyno...) Cats are not a problem if they flow enough.
The definition of loud. Well - how soft is soft? How fast is fast? A bit subjective, but all who have heard it think it is awesome.
I reckon we nailed it. Perhaps I am biased, but you don't lie in bed thinking about these things for no reason
Cheers,
Hymee.
The Hymee Mid Pipe will have a hi-flow cat and be street legal. And it won't need any O2 trickery. I don't believe in fooling the computer. (well - maybe into thinking the wheels are spining on a dyno...) Cats are not a problem if they flow enough.
The definition of loud. Well - how soft is soft? How fast is fast? A bit subjective, but all who have heard it think it is awesome.
I reckon we nailed it. Perhaps I am biased, but you don't lie in bed thinking about these things for no reason
Cheers,
Hymee.
12-17-2003, 08:12 AM
#36
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Sounds good! (the mid-pipe idea) hi-flow cats do cost alot of money however.
I ask about noise level as i drive for a large part of my work with clients and too loud can spell hooligan rather than sports car finatic.
I ask about noise level as i drive for a large part of my work with clients and too loud can spell hooligan rather than sports car finatic.
12-17-2003, 01:51 PM
#37
Kas,
We were cautious about it being to loud. But we were very happy with the result and that is was not loud. When we put the dB meter on it I'll let you know. Have another read about Wildcard's opinions on the noise level.
Cheers,
Hymee.
We were cautious about it being to loud. But we were very happy with the result and that is was not loud. When we put the dB meter on it I'll let you know. Have another read about Wildcard's opinions on the noise level.
Cheers,
Hymee.
12-17-2003, 03:47 PM
#39
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Still on the topic of exhausts -> Rotary Heaven here in SA were talking to a counterpart in Vic who fitted a custom cat back exhaust. After two different attempts they are taking a breather, because each attempt resulted in a noticeable reduction in power.
12-17-2003, 08:18 PM
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No reduction of power for us thankfully. The dyno does show a reduction in power above 7K rpm, but that is due to the ECU entering some sort of safe mode. On the street though, this doesn't happen and there is at least as much power as stock, probably marginally more. If they (the guys above) are crying foul about power after throwing it on a dyno, they are not really getting the full truth I don't believe.
How loud is loud? Well like Hymee said, I think we came close to nailing it. It's quiet at idle and while cruising, but you can also really make it sing if you want. I wouldn't go any louder if you know what I mean, but I don't think it's too loud either.
As for sound files, I should be able to sort something out next week when I get hold of my mates laptop. Sorry guys. I hate being away from my home PC too, but I'm on holidays at the moment.
How loud is loud? Well like Hymee said, I think we came close to nailing it. It's quiet at idle and while cruising, but you can also really make it sing if you want. I wouldn't go any louder if you know what I mean, but I don't think it's too loud either.
As for sound files, I should be able to sort something out next week when I get hold of my mates laptop. Sorry guys. I hate being away from my home PC too, but I'm on holidays at the moment.
12-17-2003, 08:26 PM
#41
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On the subject of going cat-less. I remember reading a link that Lock&Load posted a while ago where one of the US shops found that the only way to get decent gains was to remove the cat all together. The result however was that the exhaust becomes extremely loud, probably more than most would find acceptable for daily driving.
12-20-2003, 12:12 AM
#43
Can't wait till Wildcard gets his vids posted. I just listened to the HKS video in the main perfromance forum, and I don't think it is as nice - but hey I'm biased
In reality, they might be similar - it is hard to compare recordings to the real thing sometimes.
Can't wait - Wildcard!
You should do a write up in the Tech/Performance forum on it.
Cheers,
Hymee.
In reality, they might be similar - it is hard to compare recordings to the real thing sometimes.
Can't wait - Wildcard!
You should do a write up in the Tech/Performance forum on it.
Cheers,
Hymee.
12-21-2003, 03:32 AM
#46
I had an extended drive of the Wildcard's beast last night. The main thing I needed to check was for droning. There was none whatsoever, at a variet of cruise speeds and RPM's. That was good news.
One other benefit reported bt Wildcard - the temperature in the boot is noticible lower now he has his Hymee Cat-back.
Cheers,
Hymee.
One other benefit reported bt Wildcard - the temperature in the boot is noticible lower now he has his Hymee Cat-back.
Cheers,
Hymee.
