almost 40 HP
10-25-2004 | 08:22 PM
#1
Thread Starter
Registered User
Joined: Oct 2004
Posts: 20
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almost 40 HP
Hello All,
I was thinking about modifying my RX8, I have about 900 miles on the car.
I was looking at getting the SR Motorsports GT-4 Kit Includes:
1. Cold Air Intake System
2. Underdrive Power Pulleys
3. Complete High Flow Exhaust System
4. Stainless High Flow Midpipe
For 2099.00
Claims to boost HP almost 40 HP
Then I was looking at changing the flywheel.
Anyone have an opinion on this modification? I was looking to do this within 6 to 7 months, well maybe sooner.
Thank you all for you advice.
RX8sportscar
I was thinking about modifying my RX8, I have about 900 miles on the car.
I was looking at getting the SR Motorsports GT-4 Kit Includes:
1. Cold Air Intake System
2. Underdrive Power Pulleys
3. Complete High Flow Exhaust System
4. Stainless High Flow Midpipe
For 2099.00
Claims to boost HP almost 40 HP
Then I was looking at changing the flywheel.
Anyone have an opinion on this modification? I was looking to do this within 6 to 7 months, well maybe sooner.
Thank you all for you advice.
RX8sportscar
10-25-2004 | 08:27 PM
#3
Turbos blow!!
Joined: Oct 2004
Posts: 1,584
Likes: 0
From: my engine bay
Originally Posted by rx8sportscar
Hello All,
I was thinking about modifying my RX8, I have about 900 miles on the car.
I was looking at getting the SR Motorsports GT-4 Kit Includes:
1. Cold Air Intake System
2. Underdrive Power Pulleys
3. Complete High Flow Exhaust System
4. Stainless High Flow Midpipe
For 2099.00
Claims to boost HP almost 40 HP
Then I was looking at changing the flywheel.
Anyone have an opinion on this modification? I was looking to do this within 6 to 7 months, well maybe sooner.
Thank you all for you advice.
RX8sportscar
I was thinking about modifying my RX8, I have about 900 miles on the car.
I was looking at getting the SR Motorsports GT-4 Kit Includes:
1. Cold Air Intake System
2. Underdrive Power Pulleys
3. Complete High Flow Exhaust System
4. Stainless High Flow Midpipe
For 2099.00
Claims to boost HP almost 40 HP
Then I was looking at changing the flywheel.
Anyone have an opinion on this modification? I was looking to do this within 6 to 7 months, well maybe sooner.
Thank you all for you advice.
RX8sportscar
10-25-2004 | 08:27 PM
#4
Blue By You
Joined: Jun 2003
Posts: 8,717
Likes: 0
From: Milwaukee
I think you'd be LUCKY to get 15-20 WHP out of that. Which isn't bad, however for 2k+ it's a tough pill to swallow. Now if you just want the louder exhaust and intake and get a little more umph out of the car in the proces go for it. If you think it's going to make a big difference in power then you might end up disappointed.
Last edited by IkeWRX; 10-25-2004 at 08:36 PM.
10-25-2004 | 08:30 PM
#6
Registered User
Joined: May 2004
Posts: 92
Likes: 0
From: Off the grid
Agreed. CAIS and High Flow exhaust aren't going to get you there. You may well shuffle the power curve around, but I doubt you'd see much more than 6-8 additional peak HP borrowed from somewhere useful like the midrange. The under-drive pulleys are interesting, but in the RX-8, the accessories are the least of your worries.
You didn't mention whether you had a manual or automatic. It really doesn't matter.
You didn't mention whether you had a manual or automatic. It really doesn't matter.
10-25-2004 | 08:44 PM
#7
SR is a good shop - just expensive 
I would ask yourself what are you really after? Is the car not fast enough? Are you not happy with the way it sounds? What do you really want to spend money on to make you happy?
Let's hear what you really want, then we will give you some ideas.
I would ask yourself what are you really after? Is the car not fast enough? Are you not happy with the way it sounds? What do you really want to spend money on to make you happy?
Let's hear what you really want, then we will give you some ideas.
10-25-2004 | 08:52 PM
#8
Thread Starter
Registered User
Joined: Oct 2004
Posts: 20
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Has anyone out there done any of this type of modification?
Utilizing similar parts?
Or would it be better to get a Greddy or Racing beat exhaust?
Anyone have an idea how much it cost to install an exhaust?
Utilizing similar parts?
Or would it be better to get a Greddy or Racing beat exhaust?
Anyone have an idea how much it cost to install an exhaust?
10-25-2004 | 08:56 PM
#10
Thread Starter
Registered User
Joined: Oct 2004
Posts: 20
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I would like to take it to an all performance high, but it is fast enough (although little extra umph never hurts), I would like to have a deeper sound.
I am extremely happy and stratified with the RX8, it is totally awesome. I think it would be fun to upgrade it.
Kind of like getting new PCI Express Video card with 256 MB of RAM to play Doom 3 or Half life 2
I am extremely happy and stratified with the RX8, it is totally awesome. I think it would be fun to upgrade it.
Kind of like getting new PCI Express Video card with 256 MB of RAM to play Doom 3 or Half life 2
10-25-2004 | 08:57 PM
#11
05 Champ Car Test Driver
Joined: Jul 2004
Posts: 385
Likes: 0
From: Calgary, AB - Canada
Got it
I got it a couple of months ago.
I can tell you, DO NOT BUY THE AIR INTAKE!!!!! You'll have idle problems and the car is not going to have more power, the power actually decreases.
The pulleys are worth it and the exhaust as well.
Get the SR Flywheel instead of the intake
LS
I can tell you, DO NOT BUY THE AIR INTAKE!!!!! You'll have idle problems and the car is not going to have more power, the power actually decreases.
The pulleys are worth it and the exhaust as well.
Get the SR Flywheel instead of the intake
LS
10-25-2004 | 08:58 PM
#12
OK, I think you missed my post. 
And I did a search for you. :D
SR Intake: https://www.rx8club.com/series-i-aftermarket-performance-modifications-23/sr-motorsports-30912/
SR High Flow CAT/Midpipe: https://www.rx8club.com/series-i-aftermarket-performance-modifications-23/sr-motorsports-high-flow-cat-32945/
SR Exhaust: https://www.rx8club.com/series-i-aftermarket-performance-modifications-23/sr-motorsports-exhaust-42564/
SR Pulleys: https://www.rx8club.com/series-i-aftermarket-performance-modifications-23/eliminate-cel-w-new-sr-pullyes-41970/
The flywheel is all over the board as are others, but Charles bought it and I trust his judgement.
And I did a search for you. :D SR Intake: https://www.rx8club.com/series-i-aftermarket-performance-modifications-23/sr-motorsports-30912/
SR High Flow CAT/Midpipe: https://www.rx8club.com/series-i-aftermarket-performance-modifications-23/sr-motorsports-high-flow-cat-32945/
SR Exhaust: https://www.rx8club.com/series-i-aftermarket-performance-modifications-23/sr-motorsports-exhaust-42564/
SR Pulleys: https://www.rx8club.com/series-i-aftermarket-performance-modifications-23/eliminate-cel-w-new-sr-pullyes-41970/
The flywheel is all over the board as are others, but Charles bought it and I trust his judgement.
Last edited by Nemesis8; 11-05-2004 at 04:38 PM.
10-25-2004 | 09:24 PM
#15
Thread Starter
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Joined: Oct 2004
Posts: 20
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Fantastic!!!! 
You all have helped me a lot!!!! :D
I will get the Greddy, Racing Beat, or Borla exhaust
Then the flywheel and later get the pulleys
If there is anyone else who can make any suggestion please do.
And thank you for the links Nemesis8, I am sure it will help everyone again.
PS I have a 6 speed loaded with all the packages, just did not do the mazdaspeed wanted to do it is steps
Oh yeah the CanZoomer stuff looks very interesting
You all have helped me a lot!!!! :D
I will get the Greddy, Racing Beat, or Borla exhaust
Then the flywheel and later get the pulleys
If there is anyone else who can make any suggestion please do.
And thank you for the links Nemesis8, I am sure it will help everyone again.
PS I have a 6 speed loaded with all the packages, just did not do the mazdaspeed wanted to do it is steps
Oh yeah the CanZoomer stuff looks very interesting
10-25-2004 | 09:40 PM
#16
Captain Spaulding
Joined: Aug 2003
Posts: 223
Likes: 0
From: black bear country - NJ
I have all the SR mods that you have asked about.
Intake- I unfortunately agree with the concesus that you should probally stick with the stock intake. I have recently taken out the K&N intake which was loud and caused inconsistant idle, until I got the M flash and suddenly the itake was still loud but ran great and I never had an idle issue again. I recently installed the SR intake, which is expensive, looks great, BUT I am still experiencing not so much idle problems, but hestiation past 5K primaily in 4-6 gear. Although I have spoken to Gregg at SR, he has told me the ECU needs to relearn after removal of the K&N - I hope it improves.
I just ordered their exhaust last week, should be shipped the end of this week. I will post pictures and observations. For good or bad, after the exhaust mod, I will have the equivilent of the GT-4 total mod .
Bye the way, I highly recommend their pullies, high flow cat, and light flywheel. As has been said before - they make high quality, fairly expensive equiptment.
Intake- I unfortunately agree with the concesus that you should probally stick with the stock intake. I have recently taken out the K&N intake which was loud and caused inconsistant idle, until I got the M flash and suddenly the itake was still loud but ran great and I never had an idle issue again. I recently installed the SR intake, which is expensive, looks great, BUT I am still experiencing not so much idle problems, but hestiation past 5K primaily in 4-6 gear. Although I have spoken to Gregg at SR, he has told me the ECU needs to relearn after removal of the K&N - I hope it improves.
I just ordered their exhaust last week, should be shipped the end of this week. I will post pictures and observations. For good or bad, after the exhaust mod, I will have the equivilent of the GT-4 total mod .
Bye the way, I highly recommend their pullies, high flow cat, and light flywheel. As has been said before - they make high quality, fairly expensive equiptment.
10-25-2004 | 10:10 PM
#17
Registered User
Joined: Aug 2004
Posts: 495
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From: Des Moines, Iowa
I have a hard time believing the 40 HP number.
Air Intake....Max maybe 3
Pulley Set = SR claims 12
Exhaust. Racing beats says the most you can get with out the Cat converter is 8HP regardles if you have a muffler or not. = MAX gain HP: 23
If we adjust the Pulley kit down to say 10HP (my estimate) and te air intake to 0 HP........yes Zero. Would give you 18HP..So do you want to spend $2,099 for 18HP?
My suggestion is:
1) Racing Beat Flywheel ~$450.00 + $400 install
2) SR Pulley Set ~$429 install yourself
3) Drop in high flow filter from racing beat ~$50.00 The stock box is very good.
4) Shipping $30
5)Start a ROTH IRA and deposit $740...compounding at 7.5% over 50 years or buy the ZEX nitrous kit for ~$600 that Charles Hill has.
Take weight off the crank shaft for real returns.
Air Intake....Max maybe 3
Pulley Set = SR claims 12
Exhaust. Racing beats says the most you can get with out the Cat converter is 8HP regardles if you have a muffler or not. = MAX gain HP: 23
If we adjust the Pulley kit down to say 10HP (my estimate) and te air intake to 0 HP........yes Zero. Would give you 18HP..So do you want to spend $2,099 for 18HP?
My suggestion is:
1) Racing Beat Flywheel ~$450.00 + $400 install
2) SR Pulley Set ~$429 install yourself
3) Drop in high flow filter from racing beat ~$50.00 The stock box is very good.
4) Shipping $30
5)Start a ROTH IRA and deposit $740...compounding at 7.5% over 50 years or buy the ZEX nitrous kit for ~$600 that Charles Hill has.
Take weight off the crank shaft for real returns.
10-25-2004 | 11:11 PM
#20
Mu ha.. ha...
Joined: Aug 2004
Posts: 14,361
Likes: 3
From: Cali
You will get zero from the pullies.
What do you think this is, a V8?
We do not have heavy pullies, and we do not have to push pistons and all that other crap.
The weight reduction is so small you won't even see a gain.
And as far as undersized, I wouldn't go that route. It conflicts with future mods like Forced Induction.
Damn the car is hard enough to crank and keep cool, why would you want to reduce the cooling power and drive less voltage/amps to the battery?
What do you think this is, a V8?
We do not have heavy pullies, and we do not have to push pistons and all that other crap.
The weight reduction is so small you won't even see a gain.
And as far as undersized, I wouldn't go that route. It conflicts with future mods like Forced Induction.
Damn the car is hard enough to crank and keep cool, why would you want to reduce the cooling power and drive less voltage/amps to the battery?
10-25-2004 | 11:29 PM
#21
Originally Posted by Razz1
You will get zero from the pullies.
What do you think this is, a V8?
We do not have heavy pullies, and we do not have to push pistons and all that other crap.
The weight reduction is so small you won't even see a gain.
And as far as undersized, I wouldn't go that route. It conflicts with future mods like Forced Induction.
Damn the car is hard enough to crank and keep cool, why would you want to reduce the cooling power and drive less voltage/amps to the battery?
What do you think this is, a V8?
We do not have heavy pullies, and we do not have to push pistons and all that other crap.
The weight reduction is so small you won't even see a gain.
And as far as undersized, I wouldn't go that route. It conflicts with future mods like Forced Induction.
Damn the car is hard enough to crank and keep cool, why would you want to reduce the cooling power and drive less voltage/amps to the battery?
10-26-2004 | 08:24 AM
#25
Registered User
Joined: Aug 2004
Posts: 495
Likes: 0
From: Des Moines, Iowa
Hmm Zero? as in Zilch?
Originally Posted by Razz1
You will get zero from the pullies.
What do you think this is, a V8?
We do not have heavy pullies, and we do not have to push pistons and all that other crap.
The weight reduction is so small you won't even see a gain.
And as far as undersized, I wouldn't go that route. It conflicts with future mods like Forced Induction.
Damn the car is hard enough to crank and keep cool, why would you want to reduce the cooling power and drive less voltage/amps to the battery?
What do you think this is, a V8?
We do not have heavy pullies, and we do not have to push pistons and all that other crap.
The weight reduction is so small you won't even see a gain.
And as far as undersized, I wouldn't go that route. It conflicts with future mods like Forced Induction.
Damn the car is hard enough to crank and keep cool, why would you want to reduce the cooling power and drive less voltage/amps to the battery?
Hmm not so sure about zero from pullies: CORTC did this testing on his own:
https://www.rx8club.com/showthread.p...ulley+titanium
He states:
"I have to make 10 sets otherwise the price goes up, will post official results later but so far testing of the pulleys with no under driving yielded 6.2hp/2.4lbs, pulleys and bolts 7.1hp/2.9lbs... Had one crank pulley made with 10% under drive that gave 8.9hp/3.9lbs... Testing was done on a stock RX8 demo with 3700 miles on the odometer...
These are real numbers..."
Do you have the pulley set on your car? Have you ever had an underdrive pulley set on any vehicle of yours before? I have underdrive Pulley on my 300zx, with an aftermarket electric cooling fan (replaced the clutch fan) and never had an issue with the alternator or cooling, even in 96F+ hot weather in North Carolina summers.
I have the SR pulley set on the RX-8 and never had a problem with the Alternator or cooling either....in fact I would say at high RPMs the underdrive pulley is better for cooling since the waterpump will not cavitate at high RPMs. oh yeah, the AC still blows nice and cold on both of my cars.
So if CORTC got 9HP from an underdrive pulley at 10% underdrive. I think SRs @ 20-25% undedrive(not sure which), would seem feasible to yield 12HP..not the zero you stated.
I would agree with you that the stock pulley's are very very light(no harmonic balancer), thus the HP gain would be mainly from a reduction in parasitic drag.
Also underdrive pulley's, in theory should allow you alternator, water pump and AC compressor to have longer useful lives.
Cheers