Pettit Super Charger Owners
06-08-2008, 08:19 PM
#2261
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It is a balancing act. If you only run a pre-blower nozzle, your nozzle size will have to be somewhere of 225ml or higher in order to notice any lower IAT changes after the blower. If you run only run a post-blower nozzle it will have to be the same but the methanol mixture will not have enough time to atomize, which will result in lower whp. We tested a post-blower nozzle at the Pettit dyno and were able to achieve 289 whp with the 100ml nozzle and 263 whp with the 225ml nozzle. Keep in mind that both runs were made with a cool engine/intercooler. In order to achieve the same results but using less methanol I decided to run a 100ml nozzle pre-blower in order to lower the blower temperature and a 60ml nozzle post-blower to actually lower the IAT. Also, I relocated the post-blower nozzle to the farthest most point from the lower intake (just after the intercooler) thus allowing better atomization of the methanol/air mixture before entering the lower intake. This is only my suggestion and no dyno has been done to confirm it. I will be taking the car back to a dyno early next month to determine the best combination and runs will be done with the engine at normal or above operating temperature (which is the norm). Basically, if a 100ml pre-blower in conjunction with a 60ml post-blower (100 + 60 = 160) can achieve the same whp as of a 225ml pre-blower then the result will be 65 less ml of methanol injected into the engine. Will it work? I don’t know. Only a dyno will be able to determine that. A butt dyno will NOT be able to determine the differences of 20~30 whp. Well, at least my butt dyno can’t. And why wait for the dyno until next month? Because I’m installing an ExoticSpeed header on the 18th. I believe that I will be the first Pettit SC RX8 with a header unless there is one already out there. There is only 2~4 hp gains on a NA RX8 but I haven’t found any hp gain results from any header manufactures on a RX8 with a supercharger. Will it be worth it? I don’t know. But $500 for a brand new ExoticSpeed header, I could not pass on a one in a lifetime deal like that. If no major hp are gain, at least the car will drop a few extra pounds. 
Last edited by marsredr100; 06-08-2008 at 08:28 PM.
06-08-2008, 09:42 PM
#2262
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Maybe you could play around with your mix?? What is that mixture flash point, I think 1/3 water, dont quote me on that. Im woundering if you get that perfect mix to where it almost burns it, even if it did burn just a little or alot
Didnt they do that on F1s for a while.
Didnt they do that on F1s for a while.
06-08-2008, 09:48 PM
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Maybe you could play around with your mix?? What is that mixture flash point, I think 1/3 water, dont quote me on that. Im woundering if you get that perfect mix to where it almost burns it, even if it did burn just a little or alot Didnt they do that on F1s for a while.
Didnt they do that on F1s for a while.
06-08-2008, 10:23 PM
#2264
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Has anyone used exhaust pipe wrap to keep the heat off the intake?
I am thinking of wrapping both the exhaust pipes and the lower intake that runs near the exhaust, I hope to be able to drop the temp a bit more if the methanol is no longer fighting the exhaust.
I am thinking of wrapping both the exhaust pipes and the lower intake that runs near the exhaust, I hope to be able to drop the temp a bit more if the methanol is no longer fighting the exhaust.
06-08-2008, 10:27 PM
#2265
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marsredr100
Wouldn't the air/fuel mapping make a difference in what methanol nozzle is best?
My mixture was a little leaner than I wanted, I think I made more power with methanol running.
PS: there is always the Nitro-Booster add-in to the methanol!
Wouldn't the air/fuel mapping make a difference in what methanol nozzle is best?
My mixture was a little leaner than I wanted, I think I made more power with methanol running.
PS: there is always the Nitro-Booster add-in to the methanol!
06-08-2008, 10:44 PM
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Might want to fab a good shield, I havent gotten around to it yet. I looked at the stock manifold out of a car and it looked like it would be a pain to wrap.
06-09-2008, 06:41 AM
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06-09-2008, 06:47 AM
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marsredr100
Wouldn't the air/fuel mapping make a difference in what methanol nozzle is best?
My mixture was a little leaner than I wanted, I think I made more power with methanol running.
PS: there is always the Nitro-Booster add-in to the methanol!
Wouldn't the air/fuel mapping make a difference in what methanol nozzle is best?
My mixture was a little leaner than I wanted, I think I made more power with methanol running.
PS: there is always the Nitro-Booster add-in to the methanol!
Are you using the Nitro-Booster? Do you notice any gains?
06-09-2008, 05:07 PM
#2269
wrapping the header would be a major pain since it almost touches the lower intake etc--then you have to be concerned about the o2 sensor getting too hot etc. i did install a heat shield on top of the header and i think that helped a little.
the lower intake soaks heat like a bitch--i can see the iat going up as the engines temp goes up etc. Now do remember that the temp of the surface of the intake IS NOT your intake charge temp. That is one reason why the w/m system is so cool---pun intended.
i am tempted to just install the 175 nozzle post blower just to see how that works. But I dont dyno like Juan does---hes the man-- and I bet that 8 with that header is going to sound soooooo good.
olddragger
the lower intake soaks heat like a bitch--i can see the iat going up as the engines temp goes up etc. Now do remember that the temp of the surface of the intake IS NOT your intake charge temp. That is one reason why the w/m system is so cool---pun intended.
i am tempted to just install the 175 nozzle post blower just to see how that works. But I dont dyno like Juan does---hes the man-- and I bet that 8 with that header is going to sound soooooo good.
olddragger
06-09-2008, 05:57 PM
#2270
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wrapping the header would be a major pain since it almost touches the lower intake etc--then you have to be concerned about the o2 sensor getting too hot etc. i did install a heat shield on top of the header and i think that helped a little.
the lower intake soaks heat like a bitch--i can see the iat going up as the engines temp goes up etc. Now do remember that the temp of the surface of the intake IS NOT your intake charge temp. That is one reason why the w/m system is so cool---pun intended.
i am tempted to just install the 175 nozzle post blower just to see how that works. But I dont dyno like Juan does---hes the man-- and I bet that 8 with that header is going to sound soooooo good.
olddragger
the lower intake soaks heat like a bitch--i can see the iat going up as the engines temp goes up etc. Now do remember that the temp of the surface of the intake IS NOT your intake charge temp. That is one reason why the w/m system is so cool---pun intended.
i am tempted to just install the 175 nozzle post blower just to see how that works. But I dont dyno like Juan does---hes the man-- and I bet that 8 with that header is going to sound soooooo good.
olddragger
Wouldn't the proximity of the lower intake make wrapping the header better?
I admit the O2 sensor would probably bite it much sooner, but maybe the intake charge will come down, I have seen my IAT go to 160 degrees before.
(Gotta love Orlando summer traffic)
06-09-2008, 06:18 PM
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I'm an embarrassed owner of an 07 RX8 6spd-auto with a Pettit stage II sc. I have read the owners manual, searched for an answer for hours online, and went to my local Mazda dealership for help, but I can't find my tranny fluid dipstick! They printed a picture showing it to be a red cap in front of the passenger side firewall, but I can't find it.
So far, I'm having a blast. I'm premixing protek with every fill-up, and redlining at least once every trip out. The center console gets pretty warm and I'm scared to death, well, at least a little paranoid that the tranny is overheating.
Anyhow, is the 07 auto a sealed unit, or is the dipstick relocated or hidden by the SC? Maybe an old guy too blind to find a dipstick should'nt be allowed to drive a SC'd rx8, but, hey, I think i'm in love.
So far, I'm having a blast. I'm premixing protek with every fill-up, and redlining at least once every trip out. The center console gets pretty warm and I'm scared to death, well, at least a little paranoid that the tranny is overheating.
Anyhow, is the 07 auto a sealed unit, or is the dipstick relocated or hidden by the SC? Maybe an old guy too blind to find a dipstick should'nt be allowed to drive a SC'd rx8, but, hey, I think i'm in love.
06-09-2008, 06:36 PM
#2272
wrapping the header would be good--dont forget you already have a double wall header and an aluminum heat shroud on top of that. it would be a bitch to wrap and get it all covered---and you have to get it ALL covered. it would be better to have a shroud of some sort me think. Also remember a lot of this heat is coming from the engine and not the header.
I agree with Juan getting the water meth "tuned" is the best bet and if you dont have a water meth system GET ONE!!!
OD
I agree with Juan getting the water meth "tuned" is the best bet and if you dont have a water meth system GET ONE!!!
OD
06-09-2008, 06:58 PM
#2274
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I'm an embarrassed owner of an 07 RX8 6spd-auto with a Pettit stage II sc. I have read the owners manual, searched for an answer for hours online, and went to my local Mazda dealership for help, but I can't find my tranny fluid dipstick! They printed a picture showing it to be a red cap in front of the passenger side firewall, but I can't find it.
So far, I'm having a blast. I'm premixing protek with every fill-up, and redlining at least once every trip out. The center console gets pretty warm and I'm scared to death, well, at least a little paranoid that the tranny is overheating.
Anyhow, is the 07 auto a sealed unit, or is the dipstick relocated or hidden by the SC? Maybe an old guy too blind to find a dipstick should'nt be allowed to drive a SC'd rx8, but, hey, I think i'm in love.
So far, I'm having a blast. I'm premixing protek with every fill-up, and redlining at least once every trip out. The center console gets pretty warm and I'm scared to death, well, at least a little paranoid that the tranny is overheating.
Anyhow, is the 07 auto a sealed unit, or is the dipstick relocated or hidden by the SC? Maybe an old guy too blind to find a dipstick should'nt be allowed to drive a SC'd rx8, but, hey, I think i'm in love.