White Exhaust?
10-04-09, 09:40 AM
#1
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White Exhaust?
Me and my dad were out last night and I noticed his exhaust was white. I didnt think anything of it till this morning and he saw it. Does anyone have any idea what your exhaust being white means?
Info, 94 FD running on 110 octane if that helps.
It has a racing beat exhasut sort of like this where the pipes are inside the two mufflers. the inside pipes are white
Info, 94 FD running on 110 octane if that helps.
It has a racing beat exhasut sort of like this where the pipes are inside the two mufflers. the inside pipes are white
Last edited by namawon; 10-04-09 at 09:46 AM.
10-04-09, 10:42 AM
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Look at the picture I posted and you see how the inside pipes are like well normal color? those inside pipes are white on the fd.its like someone spray painted them white.(obviously not though)
Yes, its leaded.
Yes, its leaded.
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10-04-09, 11:38 AM
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We just ran it on a back road and hit about 105 and it didnt blow up so i dont know. were gonna try and take it to a local rotary guy, JR. It sputters though or missfires, not the turbos the spark plugs, but the spark plugs are new.
yah the white stuff came back after i wiped it off. so it has to d wth the engine
yah the white stuff came back after i wiped it off. so it has to d wth the engine
10-04-09, 12:38 PM
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Nothing major. basic bolt ons. 3" all the way exhaust, greddy intercooler, alot of greddy pipping. and 99' spec rx7 twin turbos. Its a really long story. He doesnt want to buy a boost gauge(mostly cause theres no money) and hes scared to run 93 with the boost hitting 15. Should he stop running race gas? if you cant tell me and my dad are new to rotarys. mostly me.
Btw, its the stock computer, and theres no main cat.
Btw, its the stock computer, and theres no main cat.
Last edited by namawon; 10-04-09 at 12:43 PM.
10-04-09, 01:00 PM
#14
F'n Newbie...
iTrader: (6)
15psi of boost + stock ECU = BAD IDEA!!!! (is that even possible? fuel cut hits at 11-11.5psi depending on RPM iirc...)
How are you "saving money" by running 110 Octane versus buying a boost gauge? I should think you'd be able to purchase a good boost gauge with the extra money you are putting into that extra 17 octane..
Best insurance policy ever you can have for running high boost on standard fuel is an Auxillary Injection system. There is a sub-forum here dedicated to it. You should check it out. There are plenty of forum members who are safely running over 15psi on stock fuel by running AI, myself included (I run 17.5psi all day, every day on BNRs).
Read the forum and learn before you start modifying your car and upping the boost.
How are you "saving money" by running 110 Octane versus buying a boost gauge? I should think you'd be able to purchase a good boost gauge with the extra money you are putting into that extra 17 octane..
Best insurance policy ever you can have for running high boost on standard fuel is an Auxillary Injection system. There is a sub-forum here dedicated to it. You should check it out. There are plenty of forum members who are safely running over 15psi on stock fuel by running AI, myself included (I run 17.5psi all day, every day on BNRs).
Read the forum and learn before you start modifying your car and upping the boost.
10-04-09, 01:20 PM
#17
there are so many things wrong with what you're doing. i'm not trying to be a dick, but it sounds like you or the previous owner just slapped on a bunch of parts without researching at all.
how do you know it's hitting 15 psi without a boost gauge? have you hit fuel cut (the car would feel like it suddenly cut power off)?
don't drive the car any more until you figure out what your boost level is and get it under control.
You can get a good VDO boost guage for 30 bucks and you can make a pair of manual boost controllers for $25 in parts. You'll probably have to make restrictor plates for the exhaust system to increase resistance in order to get the boost back to normal since all that flow is probably enough to overwhelm the wastegate.
how do you know it's hitting 15 psi without a boost gauge? have you hit fuel cut (the car would feel like it suddenly cut power off)?
don't drive the car any more until you figure out what your boost level is and get it under control.
You can get a good VDO boost guage for 30 bucks and you can make a pair of manual boost controllers for $25 in parts. You'll probably have to make restrictor plates for the exhaust system to increase resistance in order to get the boost back to normal since all that flow is probably enough to overwhelm the wastegate.
10-04-09, 01:30 PM
#18
Nothing major. basic bolt ons. 3" all the way exhaust, greddy intercooler, alot of greddy pipping. and 99' spec rx7 twin turbos. Its a really long story. He doesnt want to buy a boost gauge(mostly cause theres no money) and hes scared to run 93 with the boost hitting 15. Should he stop running race gas? if you cant tell me and my dad are new to rotarys. mostly me.
Btw, its the stock computer, and theres no main cat.
Btw, its the stock computer, and theres no main cat.
1) How do you know you are boosting 15 psi without a boost gauge?
2) with all of those mods it is very likely that you have elevated boost levels and or spiking.
3) you need a boost gauge and a boost controller
4) Have your dad purchase a boost controller preferably the greedy profec B spec II. it has digital display that shows boost accuraely as well as controlling it. Note: If you get that you don't need a boost gauge.
5) When you get the boost controller keep the boost down to 10 psi and you will no longer have to worry about running high octane gas. But it must be 10 psi SOLID no spikes nor creep.
6) Spending money on race gas will be more expensive in the long run that just just doing it right now.
) if your pop is worried about spending $300 bucks on this car this is the wrong car for him.
Last edited by Montego; 10-04-09 at 01:32 PM.
10-04-09, 02:36 PM
#19
^^Ditto that.. $300 is a small price to pay. For anything with these cars really...
I am not sure what 110 is around where you are but here it is FAR more than premium and will easily be the price of a boost gauge.
As mentioned above 15psi on the stock ecu (even if that is possible, I don't know b/c I have never used the stock ecu) is one of the worst things you can do with this car EVEN running 110 fuel.
I run 15psi on my 500R single turbo (more air than 15psi on those lil twins) and run 91oct (highest available here) and have great compression at my last check. BUT I have appropriate suppourt to do that.
We are not trying to bash you or your dad, but just trying to help you guys save the motor. Either way there is money that needs to be spent on necessary tools preferably before you pop the motor. And if you loose that motor, you will STILL need those tools installed on the car.
I am not sure what 110 is around where you are but here it is FAR more than premium and will easily be the price of a boost gauge.
As mentioned above 15psi on the stock ecu (even if that is possible, I don't know b/c I have never used the stock ecu) is one of the worst things you can do with this car EVEN running 110 fuel.
I run 15psi on my 500R single turbo (more air than 15psi on those lil twins) and run 91oct (highest available here) and have great compression at my last check. BUT I have appropriate suppourt to do that.
We are not trying to bash you or your dad, but just trying to help you guys save the motor. Either way there is money that needs to be spent on necessary tools preferably before you pop the motor. And if you loose that motor, you will STILL need those tools installed on the car.
10-04-09, 04:37 PM
#20
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Ok, wow so many repsonses from a miss-type. Yes, there is a boost gauge, I meant to say controller.
As far as the fuel cut off the people who he bought it from somehow bypassed it or just did away with it, im not sure either way because it wouldnt spike to 15lbs if there was a cutoff. Now when he shift normally or up to 6k it goes to 12lbs, which is good, but the other night he went to 7k and it spiked to 15lbs.
So until he gets a boost gauge hes just not going to drive it that hard. Yes, hes going to go back to 93 octane. As as mentioned before about the wideband, I have no clue what that is.. someone explain? We havent put the car to any computer or no kind of tuning has been done yet.
So were not sure if its the stock computer, were just going off what the previous owner told us. which wasnt alot, he pretty much screwed the car up. As far as the white residue on the exhaust we checked the coolant and it was fine. So for now were assuming its just because of the race gas. Thanks guys.
As far as the fuel cut off the people who he bought it from somehow bypassed it or just did away with it, im not sure either way because it wouldnt spike to 15lbs if there was a cutoff. Now when he shift normally or up to 6k it goes to 12lbs, which is good, but the other night he went to 7k and it spiked to 15lbs.
So until he gets a boost gauge hes just not going to drive it that hard. Yes, hes going to go back to 93 octane. As as mentioned before about the wideband, I have no clue what that is.. someone explain? We havent put the car to any computer or no kind of tuning has been done yet.
So were not sure if its the stock computer, were just going off what the previous owner told us. which wasnt alot, he pretty much screwed the car up. As far as the white residue on the exhaust we checked the coolant and it was fine. So for now were assuming its just because of the race gas. Thanks guys.
Last edited by namawon; 10-04-09 at 04:39 PM.
10-05-09, 09:19 AM
#22
A wideband O2 sensor is a device used for monitoring the air to fuel ratio. This is one of the tools that tuners will use to adjust the amount of fuel being sprayed into the motor. I am not sure if it is possible to bypass the fuel cut. Although I am sure someone more knowledgeable on the stock ecu will chime in at some point. To help anymore we need to determine if it is boost spiking or creeping that you are dealing with. Based off of the exhaust you mentioned it is most definately boost creep, and that cannot be controlled properly with just a boost controller. You will need to port the wastegate, OR add some restriction back to the exhaust. Do a search on here in to learn more about boost creep. It has been discussed hundreds of times.
If your dad does not want to spend the cash on an electronic boost controller then he can purchase much cheaper manual controllers but they are more time consuming to set up. Although like I mentioned, if the boost is creeping either of these will not help much. If your dad is so unwilling to spend a measly $300, then like mentioned by another member, this is DEFINATELY not the car for you guys. Parts are expensive and mistakes concerning boost are VERY EXPENSIVE. The rotary motor does not tollerate detonation well...
If your dad does not want to spend the cash on an electronic boost controller then he can purchase much cheaper manual controllers but they are more time consuming to set up. Although like I mentioned, if the boost is creeping either of these will not help much. If your dad is so unwilling to spend a measly $300, then like mentioned by another member, this is DEFINATELY not the car for you guys. Parts are expensive and mistakes concerning boost are VERY EXPENSIVE. The rotary motor does not tollerate detonation well...
10-05-09, 11:05 AM
#23
As far as the fuel cut off the people who he bought it from somehow bypassed it or just did away with it, im not sure either way because it wouldnt spike to 15lbs if there was a cutoff. Now when he shift normally or up to 6k it goes to 12lbs, which is good, but the other night he went to 7k and it spiked to 15lbs.
oo7arkman is correct it sounds as you are experiencing boost creep. A boost controller controls elevated boost levels as well as boost spikes, it does not do anything for boost creep. Do a search and educate yourself on what it is, and how to stop it
Drive it that hard? He shouldn't even drive it hard at all!
So were not sure if its the stock computer, were just going off what the previous owner told us. which wasnt alot, he pretty much screwed the car up. As far as the white residue on the exhaust we checked the coolant and it was fine. So for now were assuming its just because of the race gas. Thanks guys.
Good luck.
10-05-09, 11:20 AM
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Well its not that he doesn't wanna spend the money he just doesn't have it right now. as far as the boost creep were gonna get that worked out with jr but what a alternative buying a main cat?
