Added Resonated Midpipe today: Review.
07-15-03, 07:42 AM
#51
Lives on the Forum
Originally posted by apneablue
Since Jason at the RX7 Store just installed a new dyno I think it wouldn't be much for him to do a run with a straight MP and with a resonated MP to see the power difference. Come on Jason, do it and post the results on the product's page. The resonated MP may not flow as well but I guess it's a toss up...according to Icemastr, approximately a 7hp toss up to not have an obnoxious smelly car. Strange thing is, even with the o2pump not plummed into it the smell is no richer than before.
Since Jason at the RX7 Store just installed a new dyno I think it wouldn't be much for him to do a run with a straight MP and with a resonated MP to see the power difference. Come on Jason, do it and post the results on the product's page. The resonated MP may not flow as well but I guess it's a toss up...according to Icemastr, approximately a 7hp toss up to not have an obnoxious smelly car. Strange thing is, even with the o2pump not plummed into it the smell is no richer than before.
Last edited by SleepR1; 07-15-03 at 07:51 AM.
07-15-03, 08:13 AM
#52
Would someone like to explain the difference between the tiny little hump "resonator" welded into the pettit version of the RMP, and the large muffler welded into the RX7Store version?
One more restrictive than the other? One louder than the other? One last longer? Different design? What up?
One more restrictive than the other? One louder than the other? One last longer? Different design? What up?
07-15-03, 08:33 AM
#53
Originally posted by apneablue
Since Jason at the RX7 Store just installed a new dyno I think it wouldn't be much for him to do a run with a straight MP and with a resonated MP to see the power difference. Come on Jason, do it and post the results on the product's page. The resonated MP may not flow as well but I guess it's a toss up...according to Icemastr, approximately a 7hp toss up to not have an obnoxious smelly car. Strange thing is, even with the o2pump not plummed into it the smell is no richer than before.
Since Jason at the RX7 Store just installed a new dyno I think it wouldn't be much for him to do a run with a straight MP and with a resonated MP to see the power difference. Come on Jason, do it and post the results on the product's page. The resonated MP may not flow as well but I guess it's a toss up...according to Icemastr, approximately a 7hp toss up to not have an obnoxious smelly car. Strange thing is, even with the o2pump not plummed into it the smell is no richer than before.
Jason
07-15-03, 09:25 AM
#54
Eats, Sleeps, Dreams Rotary
Thread Starter
Originally posted by Jason
That is a good idea. Dyno should be up by the end of this week and I can test the MP next week.
Jason
That is a good idea. Dyno should be up by the end of this week and I can test the MP next week.
Jason
07-22-03, 12:19 AM
#56
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Originally posted by SleepR1
Cool, let us know the hp difference between nonresonated, straight-through MP, and resonated MP.
Cool, let us know the hp difference between nonresonated, straight-through MP, and resonated MP.
I will even give a deposit to get the test goin
07-22-03, 11:14 AM
#57
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Glad to here a good review on the RX-& Store MP. I jsut passed emissions yesterday (with flying colors on the hydrocarbon, barely got by on the CO), so I am considering a resonated MP. First things first tho, I still need an IC....
07-24-03, 09:01 AM
#58
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Originally posted by apneablue
I know we need a 4 or 5 rib 29.5" belt when we take off the O2pump...However, I have no clue how the belt is going to be routed...Is it going around the crank, WP, and Alternator? or is it going around the crank, alternator, and then has the outside of the belt rubbing on the WP?
can someone shine some light please?
I know we need a 4 or 5 rib 29.5" belt when we take off the O2pump...However, I have no clue how the belt is going to be routed...Is it going around the crank, WP, and Alternator? or is it going around the crank, alternator, and then has the outside of the belt rubbing on the WP?
can someone shine some light please?
if you have it on there tight enough (i cranked my tensioner all the way tight and had to replace the tensioner bolt because i broke the head off of my first one trying to get it tighter, your mileage may vary), it doesnt slip at all. if it is too loose, you will hear it squealing. if it is cranked too tight, you will burn up your pulley bearings fast, so be careful.
i used a goodyear "gatorback" belt from autozone or pepboys online. it was a 4 rib 29.5" belt, which was the best fit i could find.
before finding that one, i tried a 5 rib 30.5", which was way too loose and a 3 rib 30", which fit well but i felt didnt provide enough traction/friction for the water pump and also squealed on the pulley ribs when i started the car cold.
07-24-03, 09:45 AM
#59
NorCal 7's Co-founder
Originally posted by crazysuprakid
Begin Ricer Question....
Can you shoot flames with a midpipe threw a Dual Tip Exhaust, I.E. Racing Beat or M2, not Apexi N1. Or does it require a ricey single tip.
...End Ricer Question
Begin Ricer Question....
Can you shoot flames with a midpipe threw a Dual Tip Exhaust, I.E. Racing Beat or M2, not Apexi N1. Or does it require a ricey single tip.
...End Ricer Question
Also, for shooting flames get into 4th gear about 60 or so. Floor the gas and let off almost completely. Repeat that step 3 to 5 times depending on your mood and how nice of a flame you want, then after your last flooring of the pedal let off completely and wait a few seconds. Great backfires with good flames are sure to follow. Or for the very few people who run a Haltech E6K on their FD there is an ignition cut that you can hook up. Just set that to 6K rpm and when it's activated leave the gas floored. It only cuts the ignition so it won't hurt the motor but GOD does it throw nasty flames. My friend's 10th Anniversary FC is on tape with a 21 second straight burn!! The flame was about 3.5 feet long and a little bigger around than a basketball. Hope that helps. Laterz.
Zach
08-04-03, 03:11 PM
#62
I seriosuly doubt adding a muffler into the midpipe robs you of much hp. Even if its like 2-3 hp, who cares. Its the same with catbacks. The pettit and sr midpipes basically have a tube inside a tube design. Its straight through, and helps tune out some of the raspy tones that an open exhaust rotary tends to make. The midpipes with a muffler are quieter and nicer sounding. As far as the pullies go, you really want to get a pulley kit. I know greddy has one as well as sr, the rx-7 store, gotham, and a bunch of other places With no airpump and stock pulleys, there isn't enough contact with the water pump pulley and it will slip.
10-01-03, 09:02 PM
#64
Eats, Sleeps, Dreams Rotary
Thread Starter
Just a quick follow up...the weather is getting a bit chillier her...chillier being 45F...I took the car out for the first time in this weather with the RMP and my profec that was set on 10psi was now boosting 14psi and hitting 92% Injector duty cycle...I turned it back down to 10psi and I am back at the 82%idc...anyway, just thought it was kinda interesting how significant the jump was due to the temp drop...But still kicking *** and taking number...A boxster S tried to take me tonight....I wont say anything else funny stuff.
funny stuff.
10-01-03, 11:43 PM
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Hey guys i got a question, i have a stock midpipe that is gutted, how well? im not sure i didnt do it, but the piping diameter is not 3 inches, im wondering if that is hurting me, also have pettit catback( which i dont like ) would changing to a midpipe make a huge difference?
10-02-03, 12:14 AM
#68
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Re: Added Resonated Midpipe today: Review.
Originally posted by apneablue
Well, I went to the mechanic today and used his lift and installed my RX7Store resonated midpipe..
My previous setup was
Pettit DP
Racing Beat Dual Tip Catback.
Most of you are familiar with the RB and know it's really quiet...With the DP & CB is was slightly louder than stock. I figured that putting the resonated MP on it would wake up my neighbours...Well, as soon as I fired her I though "Hmmm, that's weird, it sounds the same
" I was expecting it to be hella loud and stinky....it was neither. I even reved it up a bit in neutral and it was a little bit louder but almost not noticable.
After the install I plugged the O2 pump hose that ran into the stock cat and disconnected the O2 pump. Then I turned off the Profec-B just incase. Prior to the MP with the Profec off I would get 6-7psi...With the MP on and the Profec off I got 7-8...So I turned down the low setting on the profec and then turned it on...went WOT and never went past 10psi...I put it on the high setting on the profec and then turned it down a tad....Hit 13psi and goddamn it pulled like a maahhhfakka!...At 13psi my Inj-duty hit 85%...think I will leave it at that and not push it anymore until I get the rebuild...
The only time you really notice a differencen in sound is when the secondary comes on. It is LOUD...cruzing around town is the same as usual...
There I did what I was afraid to do all along...This forum sure makes you paranoid.
I am like mad quick yo!
Well, I went to the mechanic today and used his lift and installed my RX7Store resonated midpipe..
My previous setup was
Pettit DP
Racing Beat Dual Tip Catback.
Most of you are familiar with the RB and know it's really quiet...With the DP & CB is was slightly louder than stock. I figured that putting the resonated MP on it would wake up my neighbours...Well, as soon as I fired her I though "Hmmm, that's weird, it sounds the same
" I was expecting it to be hella loud and stinky....it was neither. I even reved it up a bit in neutral and it was a little bit louder but almost not noticable.After the install I plugged the O2 pump hose that ran into the stock cat and disconnected the O2 pump. Then I turned off the Profec-B just incase. Prior to the MP with the Profec off I would get 6-7psi...With the MP on and the Profec off I got 7-8...So I turned down the low setting on the profec and then turned it on...went WOT and never went past 10psi...I put it on the high setting on the profec and then turned it down a tad....Hit 13psi and goddamn it pulled like a maahhhfakka!...At 13psi my Inj-duty hit 85%...think I will leave it at that and not push it anymore until I get the rebuild...
The only time you really notice a differencen in sound is when the secondary comes on. It is LOUD...cruzing around town is the same as usual...
There I did what I was afraid to do all along...This forum sure makes you paranoid.
I am like mad quick yo!
alan
10-13-03, 11:34 PM
#69
Rotary Enthusiast
Probably worth posting this link for comparison purposes.
http://www.efini.net/myrx7proto.htm
I just got rid of my high flow cat - < 1 year old and already breaking up (4k miles max). I had Don Marvel weld a dynomax bullet resonator in place.
I have a pfs exhaust and I was worried it was going to be loud as hell. Suprisingly at idle and cruising, the drone is gone. Get's marginally louder at WOT, but not too bad.
As far as loss of torque, I think I've gained torque and not just from increased spool. My test is my driveway is a pretty steep incline and I have to slowly get up the angle then hit the throttle to pull up without scratching the lip. Previously, I would have to slip the clutch a bit, now - not near as much of a problem.
My question is I am hitting about 1 bar and my injector duty is only 83%. Quite a bit different than the 12psi that was running at 82%. I've had it conservatively tuned and think that my turbos are going, but shouldn't my inj duty be higher at 14.7psi?
mods include; dp, mp w/ resonator, cb exhaust, pfc, greddy smic, and efini y-pipe.
http://www.efini.net/myrx7proto.htm
I just got rid of my high flow cat - < 1 year old and already breaking up (4k miles max). I had Don Marvel weld a dynomax bullet resonator in place.
I have a pfs exhaust and I was worried it was going to be loud as hell. Suprisingly at idle and cruising, the drone is gone. Get's marginally louder at WOT, but not too bad.
As far as loss of torque, I think I've gained torque and not just from increased spool. My test is my driveway is a pretty steep incline and I have to slowly get up the angle then hit the throttle to pull up without scratching the lip. Previously, I would have to slip the clutch a bit, now - not near as much of a problem.
My question is I am hitting about 1 bar and my injector duty is only 83%. Quite a bit different than the 12psi that was running at 82%. I've had it conservatively tuned and think that my turbos are going, but shouldn't my inj duty be higher at 14.7psi?
mods include; dp, mp w/ resonator, cb exhaust, pfc, greddy smic, and efini y-pipe.
