non-droning exhaust that can make 300rwhp ?
#1
non-droning exhaust that can make 300rwhp ?
After my tuning with Steve Kan @ Pettit, we stopped at 273 rwhp due to exhaust flow restrictions. In fact, Steve said 300+ rwhp is possible, but I need to uncork the exhaust.
Now, while I'd like to get to 300+ rwhp with my current mods (see below), I just don't want to have that dreaded highway drone @ 3K rpm, stinky exhuast, or a super loud exhuast just crusing down my neighborhood.
My search has indicated I should:
1) get a real 3-inch downpipe (I have the JDM one that is only 2.25" OD);
2) keep my HF metallic-cat and 3-inch Magnaflow resonator;
3) and replace my old (I'm the 3rd owner) TRUST muffler which sounds like the Racing Beat one.
Any recommendations for number #1 and #3 ?
Can I make 300+rwhp with a Racing Beat cat-back muffler ?
TIA,
:-) neil
(4) 850cc injectors
PFC tuned by Steve Kan
ARC SMIC
Spec '99 airbox & airbox diverter
Now, while I'd like to get to 300+ rwhp with my current mods (see below), I just don't want to have that dreaded highway drone @ 3K rpm, stinky exhuast, or a super loud exhuast just crusing down my neighborhood.
My search has indicated I should:
1) get a real 3-inch downpipe (I have the JDM one that is only 2.25" OD);
2) keep my HF metallic-cat and 3-inch Magnaflow resonator;
3) and replace my old (I'm the 3rd owner) TRUST muffler which sounds like the Racing Beat one.
Any recommendations for number #1 and #3 ?
Can I make 300+rwhp with a Racing Beat cat-back muffler ?
TIA,
:-) neil
(4) 850cc injectors
PFC tuned by Steve Kan
ARC SMIC
Spec '99 airbox & airbox diverter
#3
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i'd start with the DP. Get a used name brand one off the FS section here.
Maxcooper made good results with the same cat/resonator setup.
I doubt the cat back is an issue, but I could be wrong.
what intake do you have?
how much boost were you running to make 273HP?
running sequentially?
Maxcooper made good results with the same cat/resonator setup.
I doubt the cat back is an issue, but I could be wrong.
what intake do you have?
how much boost were you running to make 273HP?
running sequentially?
#4
Originally Posted by fastrx7r1-rotary
i'd start with the DP. Get a used name brand one off the FS section here.
Maxcooper made good results with the same cat/resonator setup.
I doubt the cat back is an issue, but I could be wrong.
what intake do you have?
how much boost were you running to make 273HP?
running sequentially?
Maxcooper made good results with the same cat/resonator setup.
I doubt the cat back is an issue, but I could be wrong.
what intake do you have?
how much boost were you running to make 273HP?
running sequentially?
That was 273 at 12 psi.
Yes, turbos are sequential.
:-) neil
#5
Rotary Enthusiast
12 psi with these mods?
(4) 850cc injectors
PFC tuned by Steve Kan
ARC SMIC
Spec '99 airbox & airbox diverter...
273 rwhp is good number...I hope to see 300 when Steve tuned mine. It is pegging at 12 - 12.5 psi so aint boosting it until she is tuned.
HKS DP, Apexi Intakes, Greddy SMIC, RB Dual Tip catback, & PFC.
(4) 850cc injectors
PFC tuned by Steve Kan
ARC SMIC
Spec '99 airbox & airbox diverter...
273 rwhp is good number...I hope to see 300 when Steve tuned mine. It is pegging at 12 - 12.5 psi so aint boosting it until she is tuned.
HKS DP, Apexi Intakes, Greddy SMIC, RB Dual Tip catback, & PFC.
#7
RX-7 Bad Ass
iTrader: (55)
Hmm, interesting. I'm running an Ebay downpipe, stock main cat, and HKS Hiper cat-back (which looks like the Apexi N1) and it's VERY docile - no highway drone, not bad around town, etc. Not sure what it would be like with a high-flow cat, though.
I do know a number of people have had very good numbers with the Racing Beat cat-backs. Also, if you stay sequential, that will help with idle and cruise noise a LOT.
You've bigtime got a restriction with the stock airbox, even with the later air intake. Unless you've hacked it up or something - the funnel air is drawn through is VERY small.
Anyhow, everything sounds good and I'm glad to hear your car is doing well!
Dale
I do know a number of people have had very good numbers with the Racing Beat cat-backs. Also, if you stay sequential, that will help with idle and cruise noise a LOT.
You've bigtime got a restriction with the stock airbox, even with the later air intake. Unless you've hacked it up or something - the funnel air is drawn through is VERY small.
Anyhow, everything sounds good and I'm glad to hear your car is doing well!
Dale
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#13
Derek
iTrader: (2)
Originally Posted by neit_jnf
I made 315whp on stock injectors at 13 psi with a 3" DP, stock cat, and RB Duals, M2 ECU, Airbox and Large SMIC and HKS TwinPower.
I now run a high flow metal core cat with magnaflow resonator but haven't dynoed yet
I now run a high flow metal core cat with magnaflow resonator but haven't dynoed yet
I think you should hit up any 3in downpipe. They are pretty much all the same, some harder to instal than others but just make sure it is stainless steel. I have a generic 3" DP, Stock Cat, Blitz Nur Spec, and running non-seq. I love it. Its not even that loud. Very deep though. I should be hitting about 300rwhp by now. I just gotta finish the tuning on my PFC because I had to get new tires (last ones were old and dry rotting).
#15
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One other suggestion that I dont think has beed mentioned, is replace the main cat with a resonator. It will offer some restriction in the system (more than a stright pipe) and get rid of the droning. Rx-7store sells a MP with a large resonator, for like $250, I think. won't do much for the smell though, with the main cat gone. You can probibly get an exhaust shop to make you one for half the price.
#17
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Originally Posted by M104-AMG
As one of my reliability mods, I'm already running a Supra Twin-Turbo fuel-pump.
The TRUST cat-back muffler I have is the original TRUST/Greddy SP.
:-) neil
PS: I just got a used HKS downpipe on ebay for $77.
The TRUST cat-back muffler I have is the original TRUST/Greddy SP.
:-) neil
PS: I just got a used HKS downpipe on ebay for $77.
#18
Racecar - Formula 2000
Originally Posted by rynberg
The HKS is the one that DOESN'T maintain a 3" downpipe -- it's crushed to clear the steering for RHD!
#21
Rotary Enthusiast
Originally Posted by rynberg
The HKS is the one that DOESN'T maintain a 3" downpipe -- it's crushed to clear the steering for RHD!
#22
A Fistfull of Dollars!
iTrader: (2)
Originally Posted by tphan
Very true but fitment was perfect...at least for mine.
#23
Racecar - Formula 2000
Originally Posted by HDP
Probably not enough to poke a mole with
#24
That casting is the problem though... it's all convoluted up at the top like the stock precat, and you'll prolly be in the same boat. Get a real 3" stainless mandrel bent DP with ceramic coating.
I can't imagine the GReddy exhaust is that restrictive compared to a Racing Beat (which isn't exactly the free-est flowing)... but let me get this straight, you've got a cat AND another resonator on there?
I don't know if the jury is in yet on those metalic cats, but if you get a good quality high-flo cat (like a bonez or something), ditch whatever extra resonator you have on there, run a regular DP, and whatever catback you like, you'll probably be fine.
I think the "drone" is a fact of life and something you'll have to live with... opening up the exhaust makes the car louder, that's just the deal.
I can't imagine the GReddy exhaust is that restrictive compared to a Racing Beat (which isn't exactly the free-est flowing)... but let me get this straight, you've got a cat AND another resonator on there?
I don't know if the jury is in yet on those metalic cats, but if you get a good quality high-flo cat (like a bonez or something), ditch whatever extra resonator you have on there, run a regular DP, and whatever catback you like, you'll probably be fine.
I think the "drone" is a fact of life and something you'll have to live with... opening up the exhaust makes the car louder, that's just the deal.
Originally Posted by M104-AMG
I was going to get the Gotham, but I like the build and casting of the HKS better.
Is the Gotham fairly good ?
:-) neil
Is the Gotham fairly good ?
:-) neil