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Old 06-22-2009, 10:10 PM
  #151  
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Originally Posted by TeamRX8 View Post
that was the discussion we had when I was on the committee, there was all kinds of discussion on using where the brick ends, but it's not easily determined etc.

and yes Jason, it was 6" from the original exit to the modified inlet, the issue is what is the cat and where are the inlet/exit ...

I would just mount the aftermarkt cat in the OE cat area myself, or rather that's what I did.
Not woth the risk of doing anything else. All you need is a PC/AP that reads it the wrong way and you are screwed. Will K had perhaps a less "clear" rule to work with in STS a few years back, and he went from first to last.

Sometimes keeping it simple is the best way.
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Old 06-22-2009, 11:04 PM
  #152  
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Originally Posted by GeorgeH View Post
Thanks! So get a cat-delete pipe with a pre-welded bung for the O2 sensor and have a shop weld that special "rally car" cat in the desired location. Pretty sweet and a 100cpi it should flow extremely well!

Any idea what dyno gains Swoope saw with it?
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Old 06-23-2009, 12:11 AM
  #153  
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Originally Posted by GeorgeH View Post
Probably the one swoope is using in this thread:

https://www.rx8club.com/showthread.php?t=136242
I emailed the seller a couple weeks ago and he was fresh out of the 100cpi cat. He said he had to order them in large quantities and didn't know when he'd get more. Last I heard form him, he was going to contact his supplier.

I asked Scott if there were any identifying marks on the cat so I could maybe find the supplier, but there weren't any, apparently.

Maybe a few of us should email him so he'll get a bunch in.
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Old 06-23-2009, 12:17 AM
  #154  
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I think he said that he saw nearly 200 Hp, but I don't know what other mods he had.

Another interesting point on this: The rules state the car must pass a "standard" EPA emissions test. I wonder if a 100 cpi cat will pass emissions on an RX-8.
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Old 06-23-2009, 12:26 AM
  #155  
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Originally Posted by Mr. Pockets View Post
I emailed the seller a couple weeks ago and he was fresh out of the 100cpi cat. He said he had to order them in large quantities and didn't know when he'd get more. Last I heard form him, he was going to contact his supplier.

I asked Scott if there were any identifying marks on the cat so I could maybe find the supplier, but there weren't any, apparently.

Maybe a few of us should email him so he'll get a bunch in.
Interesting data, thanks. I'll contact them tomorrow and see if the situation has changed.
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Old 06-23-2009, 07:51 AM
  #156  
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Originally Posted by GeorgeH View Post
I think he said that he saw nearly 200 Hp, but I don't know what other mods he had.

Another interesting point on this: The rules state the car must pass a "standard" EPA emissions test. I wonder if a 100 cpi cat will pass emissions on an RX-8.
Do the rules define what a 'standard' emissions test is? When I lived in Vermont, they just stuck a rag in the tailpipe and felt along the exhaust pipes for leaks! :D
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Old 06-23-2009, 09:55 AM
  #157  
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In central VA they do no emissions test. As long as there's no CEL, the car passes.
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Old 06-23-2009, 11:35 AM
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Originally Posted by Mr. Pockets View Post
Do the rules define what a 'standard' emissions test is? When I lived in Vermont, they just stuck a rag in the tailpipe and felt along the exhaust pipes for leaks! :D
I should not have used the word "standard."

Here is what the rule states:
All ST vehicles must comply with the EPA tailpipe emissions
test requirements as a minimum.
I believe testing requirements vary state to state, and even region to region within a state, which is interesting.
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Old 06-23-2009, 12:28 PM
  #159  
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There are two thoughts I had on the cat. position:

1)Longer header tubes to try and gain some power
2)Increase cat. life. for cats. like the RP supercat that tend to fail making it worth buying to someone like me that wants a cat. that will last the life of the exhaust.

Moving it downstream is typically prohibited due to concerns that the exhaust gases will be too cold and not light off the cat. Since we know our exhaust gases are already too hot for our cat (especially with a tuned car) couldn't we measure with an EGT sensor or thermalcouple different points along the midpipe and figure out where the optimal location would be to make sure the cat. is being activated but not cooked?

Originally Posted by Mr. Pockets View Post
Do the rules define what a 'standard' emissions test is? When I lived in Vermont, they just stuck a rag in the tailpipe and felt along the exhaust pipes for leaks! :D
Yeah it's used to be just a safety inspection. Not much emissions testing.

Where did you live in VT? Just curious as I grew up there. /start thread jack

Last edited by shaunv74; 06-23-2009 at 12:36 PM.
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Old 06-23-2009, 05:29 PM
  #160  
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Originally Posted by Mr. Pockets View Post
I emailed the seller a couple weeks ago and he was fresh out of the 100cpi cat. He said he had to order them in large quantities and didn't know when he'd get more. Last I heard form him, he was going to contact his supplier.

I asked Scott if there were any identifying marks on the cat so I could maybe find the supplier, but there weren't any, apparently.

Maybe a few of us should email him so he'll get a bunch in.
I emailed Dave again today, and he said he's not planning on getting more. His supplier has a minimum order size that's larger than Dave wants to take on. I'm disappointed, but I don't blame him one bit.

It's a shame - there aren't many inexpensive, durable options out there.
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Old 06-24-2009, 09:57 AM
  #161  
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Originally Posted by Mr. Pockets View Post
I emailed Dave again today, and he said he's not planning on getting more. His supplier has a minimum order size that's larger than Dave wants to take on. I'm disappointed, but I don't blame him one bit.
Any idea what that minimum order size might be? This 100cpi metallic cat seems to work well on rotary engines, and I'm sure we could get a group buy going. We might possibly get some rx7club folks in on it as well...
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Old 06-24-2009, 11:29 AM
  #162  
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I would be interested in one.
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Old 06-24-2009, 11:58 AM
  #163  
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Originally Posted by chiketkd View Post
Any idea what that minimum order size might be? This 100cpi metallic cat seems to work well on rotary engines, and I'm sure we could get a group buy going. We might possibly get some rx7club folks in on it as well...
I'll ask him.

Edit: Okay, Dave says he'd like 'five or six' orders. I don't want to get into the 'group buy' bidness, and I really don't want to muck up this thread any more, so if you're interested just PM me and we can figure out the particulars with Dave.

Another edit: No need to PM me. Dave has placed the order with his supplier. Just go to his site if you want one:

http://www.davesport.com/cgi-bin/davesport/DCAT100.html

Last edited by Mr. Pockets; 06-24-2009 at 05:31 PM.
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Old 06-24-2009, 12:33 PM
  #164  
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Originally Posted by Mr. Pockets View Post
I'll ask him.

Edit: Okay, Dave says he'd like 'five or six' orders. I don't want to get into the 'group buy' bidness, and I really don't want to muck up this thread any more, so if you're interested just PM me and we can figure out the particulars with Dave.
I'll send you an e-mail Nick. I do feel we could get more 'visibility' if we started a new thread. I could also ask swoope if I could use the photos of the cat he posted in the other thread.
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Old 06-24-2009, 12:54 PM
  #165  
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Btw Nick, any idea of a time frame on how long it would take Dave to get a new order in if we can get 5-6 people to sign up?

Once we get some of these details together, I'll start a new thread.

P.S. As most midpipes for the RX-8 are available in a 3" pipe size, perhaps we can specify that exhaust tubing size in this group buy? It could make Dave's job much easier on his end.

Last edited by chiketkd; 06-24-2009 at 01:18 PM.
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Old 06-25-2009, 03:50 PM
  #166  
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Originally Posted by TeamRX8 View Post
sure, just ignore all the pioneering work that was already done for you ....
Your "pioneering work" is what's leading us all down the right path. Nothing but love man!
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Old 06-26-2009, 03:19 PM
  #167  
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Has anyone tried the Bridgestone RE11s in the rain for STX? A Tire Rack test puts the RE11 as the best Street Touring type tire in the rain (.91g). I think if I go to a 245/40-18 RE11 (on stock wheels) to drive on the street. The overall diameter of the 245/40-18 is 25.7" vs. 25.9" of the stock 225/45-18. That way if I get to a local event (BS class) and its raining (hard) I can keep the RE11s on and race on the RE11s rather than switching to the Hoosiers. This answers the question of how do I get a dry race and rain race set of tires to an event without a trailer. And not get wet changing tires, I hate that. I know the Hoosiers have much better traction when its wet, but they wash out in the puddles (standing water). The RE11s should be able to go through any puddles.
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Old 06-26-2009, 03:38 PM
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I took part in this test and the top 3 tires in the wet posted times that were very, very close. (RE-11, AD08, Dunlop SS Z1) any of the three would be an excellent choice for your intended purpose. The RE-11 is the most civilized of the group for street use.

I did the same thing last year, using the Dunlop Star Spec Z1 as my daily driver/full wet tire. I was able to get approximately 15,000 miles and 50-60 runs (wet & dry) out of the tires before the tread depth became useless in the wet. I would expect similar life from the RE-11.

If ultimate wet performance is the main goal, you may want to wait to see the results of the next couple of test that we recently completed. We have found a couple of surprise performers in the wet that exceed the wet grip of the tires mentioned above.

Extreme Performance Tire Test - http://www.tirerack.com/tires/tests/...irePageLocQty=


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Last edited by Zoom4Three; 06-26-2009 at 03:45 PM.
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Old 06-26-2009, 03:45 PM
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I took part in this test and the top 3 tires in the wet posted times that were very, very close. (RE-11, AD08, Dunlop SS Z1) any of the three would be an excellent choice for your intended purpose. The RE-11 is the most civilized of the group for street use.
Chris;
Thanks for the input, which car did Tire Rack use for these tests?
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Old 06-26-2009, 03:49 PM
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Our normal test platforms - Bone stock - BMW 328i's (E92) 225/45r17 tire size

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Old 06-28-2009, 10:44 AM
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Thanks for the info Chris.
I am looking forward to the results of the "new" wet test.
Gotta think of next year and all that.
FM
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Old 06-28-2009, 03:18 PM
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Originally Posted by fastmike View Post
Thanks for the info Chris.
I am looking forward to the results of the "new" wet test.
Gotta think of next year and all that.
FM
Getting tired of stock class?
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Old 06-28-2009, 03:33 PM
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Originally Posted by GeorgeH View Post
Getting tired of stock class?
I'm sick of R tires and changing them at the site.
STR is looking good.
I still think STX in the Slowbalt is a good choice too.
FM
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Old 06-29-2009, 04:21 PM
  #174  
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Lightweight battery

Question for GeorgeH, Broda, Pockets and anyone else with a current STX car...

What light-weight batteries are you guys considering? I think TeamRX8 used the following with success:

Braille B2015 (15lb)
MSRP $159.99

6.8” x 3.4” x 6.1"

Specs
Voltage: 12 volts
Full Charge Voltage: 13.8 Volts
Short Circuit Current (Max Cranking Amps): 2500 est.
Pulse Cranking Amps (PCA) 5 sec @ 80F: 1067
Pulse Cranking Amps (PCA) 10 sec @ 80F: 933
Pulse Cranking Amps 20 sec @ 80F: 824
Cranking Amps 30 sec @ 80F: 690
Cranking Amps 30 sec @ 32F: 574
Cold Cranking Amps 30 sec @ 0F: 425
Reserve Capacity: 35 minutes
Capacity (C/20 rate): 21 amp hr
Internal Resistance:4.5 miliohms (.0045 ohms)
Life Cycle @ 10% DOD: 3100 cycles est.

Link: http://www.braillebattery.com/index....tteries/b2015/
However, due to a few wintery nights that can get down to roughly 0F I'm thinking about the following:

Braille B3121 (21lbs)
MSRP $179.99

6.6” x 5.2” x 6.8"

Specs
Voltage: 12 Volts
Full Charge Voltage: 13.8 Volts
Short Circuit Current (Max Cranking Amps): 3000 est.
Pulse Cranking Amps (PCA) 5 sec @ 80F: 1380
Pulse Cranking Amps (PCA) 10 sec @ 80F: 1207
Pulse Cranking Amps 20 sec @ 80F: 1066
Cranking Amps 30 sec @ 80F: 892
Cranking Amps 30 sec @ 32F: 742
Cold Cranking Amps 30 sec @ 0F: 550
Reserve Capacity: 1hr 15mins
Capacity (C/20 rate): 31 amp hr
Internal Resistance: 4.0 milliohms (.004 ohms)
Life Cycle @ 10% DOD: 3100 cycles est.

Link: http://www.braillebattery.com/index....tteries/b3121/
And while $179 seems pricey, it's in the same ballpark as some Optima & Odyssey batteries that I was considering.

P.S. Has anyone tried running a factory/replacement miata battery on an RX-8 such as the following:



Voltage 12
Amp Hour 31
CCA* 475
Length 7 1/2"
Width 5"
Height 7"
Weight 25lbs
MSRP $124.95

Link: http://www.westcobattery.com/miata.html

Last edited by chiketkd; 06-29-2009 at 04:27 PM.
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Old 06-29-2009, 04:32 PM
  #175  
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I'm considering the Odyssey PC680 as well. Not sure what the strengths & weaknesses of the Optima vs. Odyssey. I recall reading that Mark has used both; perhaps he will comment.

Right now, I'm trying to determine if I can use the factory hold-downs until I find the time to relocate the battery.

I'll also keep the OEM battery around as well. In fact, for the longer road trips to Helena & Lincoln, I might just leave the OEM battery in and swap it out when I get there. I'd certainly use the OEM battery in the winter.
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