The Interceptor-X for N/A Cars
#726
Go Texas Longhorns!
Originally Posted by TeamRX8
yes, but you're talking 2000+ degF sustained WOT on the newest metallic converter technology to do it which is not easy in an unported renesis, lean or not
maybe they're using cheap cats ...
maybe they're using cheap cats ...
#728
Bigus Rotus
iTrader: (3)
Originally Posted by MazsportScott
The cars were running a heatwrapped straight 3inch intake w/HKS filter and a 3 inch exhaust. There is probably 3-5 more rwhp in the car,due to the exhaust system...
#733
Bigus Rotus
iTrader: (3)
Originally Posted by MazsportScott
Did anyone notice the torque curve at 7,000rpm, take a closer look when compared to other N/A charts. The #'s are higher and the torque curve is much broader which will produce better real world results. Scott
My disappearing curve is due to the dyno not picking up the RPM signal. But your right, the torque carries out pretty broadly I must say.
#734
Registered
Originally Posted by Nemesis8
So where is the 3-5 more rwhp due to the exhaust system going to come from
#735
Registered
Originally Posted by TeamRX8
they're only cruising though, which means low total heat mass output. You're making assumptions ...
#736
Mazsport.net
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Originally Posted by Nemesis8
So where is the 3-5 more rwhp due to the exhaust system going to come from
#738
Bigus Rotus
iTrader: (3)
Hey Scott - I'm back it seems
I think I will hold off a few years for forced induction. The backroads around Aberdeen up around the Olympic National Park are a blast with my setup, so I think I will tune a NA further. Waiting on Brillos report. If I fly you up here, I need to know if you like the outdoors
I think I will hold off a few years for forced induction. The backroads around Aberdeen up around the Olympic National Park are a blast with my setup, so I think I will tune a NA further. Waiting on Brillos report. If I fly you up here, I need to know if you like the outdoors
#741
No respecter of malarkey
iTrader: (25)
Originally Posted by rotarygod
Trust me, you can get plenty of cat damaging heat at low throttle settings. On my RX-7, I've gotten a cat to glow red hot at idle from an improper mixture! I don't really think there's any assumptions about it. Your assuming that only higher throttle and load levels have the energy to hurt the cat and that's not true. The mixture itself has just a large effect on exhaust heat than the rpm and load level do.
Yes, but it seems that you're talking about a grossly improper mixture and I'm talking about reasonably near stoich. plus glowing red can only be 1500-1600 degF. There are cats out there than can handle near 2100 degF continuous, so "glowing red" really doesn't mean much without an actual measurement. Further, the exhaust gases on the Renesis are lower than the previous RX-7 engines thanks to the new port configuration. If you pursue overlap porting this may change, but it remains to be seen.
There is still heat mass to be considered, this is simple physics. High temperature with low flow is more easily dissipated as opposed to high flow and high temperature. You'll have bigger problems than a fried cat if you try running that lean for anything other than the lightest load range.
Last edited by TeamRX8; 04-22-2006 at 11:26 PM.
#742
Go Texas Longhorns!
As far as I know, Scott is still waiting to get critical ECu parts from Australia, I think I'm in the next batch? Believe me, I can't wait, I'd like to be able to use 87oct and get better mileage.
#744
Registered
I am under the opinion that if we add overlap to these engines, we will lose horsepower and not gain it. I think overlap or lack thereof needs to be re-studied.
You are assuming that small changes in a/f ratio can't have large changes in exhaust temperature. Again not necessarily true. A lean cruising mixture can kill a cat as fast as an overly rich one. Mazda actually runs the car overly rich to cool the exhaust down somewhat and not the other way around. The cats are dying because they are crappy cats. The extremes on either side will result in a very hot mixture. We've seen cats fall apart just from bad materials that had nothing to do with extreme temperatures. Simple physics also has nothing to do with shoddy build quality.
I still say everyone should run around with no cars whatsoever and run as lean as they need to to make the best power and economy but some tree hugger would probably get mad at me for the suggestion.
You are assuming that small changes in a/f ratio can't have large changes in exhaust temperature. Again not necessarily true. A lean cruising mixture can kill a cat as fast as an overly rich one. Mazda actually runs the car overly rich to cool the exhaust down somewhat and not the other way around. The cats are dying because they are crappy cats. The extremes on either side will result in a very hot mixture. We've seen cats fall apart just from bad materials that had nothing to do with extreme temperatures. Simple physics also has nothing to do with shoddy build quality.
I still say everyone should run around with no cars whatsoever and run as lean as they need to to make the best power and economy but some tree hugger would probably get mad at me for the suggestion.
#745
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OK guys, the last posts are about how a catalyser is dead by lean mixtures, etc.
Now, has anyone run an RX-8 catless with the interceptor-X and tunned for max power (or leanest mixtures) at any speed/load?
Any real figures of power, drivability and mileage?
Cheers
jird20
Now, has anyone run an RX-8 catless with the interceptor-X and tunned for max power (or leanest mixtures) at any speed/load?
Any real figures of power, drivability and mileage?
Cheers
jird20
#746
Quick question here sorry for being a newb but im not very technically inclined when it comes to cars but i would like to see some of the incresses that have been discussed here. How much do i have to know to get the interceptor-x.
#747
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You don't have to know anything to GET it, but you have to know "something" to use it...
Whether it be you that knows how to tune, or you knowing someone that knows how to tune. Buying one will be completely useless unless you can tune it.
Whether it be you that knows how to tune, or you knowing someone that knows how to tune. Buying one will be completely useless unless you can tune it.
#748
Zoom-Freakin'-Zoom
iTrader: (5)
Originally Posted by jird20
OK guys, the last posts are about how a catalyser is dead by lean mixtures, etc.
Now, has anyone run an RX-8 catless with the interceptor-X and tunned for max power (or leanest mixtures) at any speed/load?
Any real figures of power, drivability and mileage?
Cheers
jird20
Now, has anyone run an RX-8 catless with the interceptor-X and tunned for max power (or leanest mixtures) at any speed/load?
Any real figures of power, drivability and mileage?
Cheers
jird20
yes,
that was the whole start of the thread.... my car was run with the cepter x with a borla resonated midpipe. max hp was 205 at the rear wheels, but it picked up over 22 hp in a large part of the midrange... is that the answer you are looking for???
btw, start reading at page 32 of the thread... all the answers are in that area.
beers
Last edited by swoope; 04-23-2006 at 09:24 PM.
#749
No respecter of malarkey
iTrader: (25)
Logged some cat temps today with the CANScan.
Indicated 1650 degF with O2 oscillating between 0.99 and 1.01 lambda while cruising at 40 mph
I didn't have the opportunity to do any extended WOT checks, another day ... a couple of short bursts and it never went below an indicated 0.85 lambda, pretty sure the most recent flash is installed ...
Indicated 1650 degF with O2 oscillating between 0.99 and 1.01 lambda while cruising at 40 mph
I didn't have the opportunity to do any extended WOT checks, another day ... a couple of short bursts and it never went below an indicated 0.85 lambda, pretty sure the most recent flash is installed ...
Last edited by TeamRX8; 04-24-2006 at 02:49 AM.