[Emil@RENN-ART]

Originally Posted by hl0m4n

PS: are those cats on your rennart exhaust setup?

We have an option to get resonators on the front pipes to make the exhaust even quieter. Personally, I think the non-res is quiet enough as it is, but this really makes sure it's a classy sound.

[hl0m4n]

vacuum line meaning the line that was on the factory exhaust? the one that controls the valve? if so i saw what the isntaller did with that. he got a bolt of somesort plugged it and then tucked the wire up behind the metal casing in the fenderwell.

[Sharewin@Logic]

Originally Posted by hl0m4n

vacuum line meaning the line that was on the factory exhaust? the one that controls the valve? if so i saw what the isntaller did with that. he got a bolt of somesort plugged it and then tucked the wire up behind the metal casing in the fenderwell.

Ya its a black hose. Ok cool then i guess it was plugged up.

Might wanna double check it again just to make sure.

[Evo8MRto335I]

Originally Posted by Emil@RENN-ART

We tested ours on the same day .. didn't do any kind of battery/ECU resets.. just unbolted the stock exhaust and bolted ours on. We got a 11whp/9wtq gain.

Stranger things have happened. I've seen aftermarket exhausts actually make a car lose hp compared to stock.. not very common and not to say this is the case here... maybe someone could test it again on the same day.

Just my $.02

I hope to get mine soon. I ordered one from you guys..

[hl0m4n]

why do you lose power if the black line is open?

[Sharewin@Logic]

Originally Posted by hl0m4n

why do you lose power if the black line is open?

You will have a Vacuum leak.

[hl0m4n]

Originally Posted by Sharewin@Logic

You will have a Vacuum leak.

whats the best way to plug it? possible it may have fell out? the installer just got a random thing in a tool box plugged it and stuffed it away.

maybe i will buy the plug that britalman supplies on their exhausts....

[T Bone]

Originally Posted by hl0m4n

whats the best way to plug it? possible it may have fell out? the installer just got a random thing in a tool box plugged it and stuffed it away.

maybe i will buy the plug that britalman supplies on their exhausts....

Do what Revlis did.....unplug the selenoid that controls the valve see:

http://www.e90post.com/forums/showpo...85&postcount=1


BTW, I would be interested to see if this had an impact on performance. Some of the golf-tee mod people claim they feel like they are getting less power.

[hl0m4n]

Originally Posted by T Bone

Do what Revlis did.....unplug the selenoid that controls the valve see:

http://www.e90post.com/forums/showpo...85&postcount=1


BTW, I would be interested to see if this had an impact on performance. Some of the golf-tee mod people claim they feel like they are getting less power.

so unplug that and go on dyno? i read that post before and it says that the error code stays.

if the line is bent bad that wouldn't make a difference right as long as the end is still plugged?

[T Bone]

Originally Posted by hl0m4n

so unplug that and go on dyno? i read that post before and it says that the error code stays. if the line is bent so there is no air escaping that wouldn't make any difference right?

From what I remember, the code gets stored but you don't get an error message so who cares. I don't think it will make a difference but I am a bit of a purist, who actuate the valve when you don't need to.

BTW, I still get the sense of regret....don't....you have a sweet car and unless you are getting a walmart exhaust, you are not going to lose power on a cat back for a turbo. While I think you should do another set of dynos, you may consider that you are stressing your engine and drivetrain with this....

[hl0m4n]

Originally Posted by T Bone

From what I remember, the code gets stored but you don't get an error message so who cares. I don't think it will make a difference but I am a bit of a purist, who actuate the valve when you don't need to.

BTW, I still get the sense of regret....don't....you have a sweet car and unless you are getting a walmart exhaust, you are not going to lose power on a cat back for a turbo. While I think you should do another set of dynos, you may consider that you are stressing your engine and drivetrain with this....

i don't have a regret of buying the ss exhaust. i just don't know why im getting the #s i did and want to know if there is something wrong or was it just the conditions that day.

i never drive the car hard. i have always babied the car and drove normally and only time it has been driven hard is the two dynos which i made them do at ideal oil temp at around 210-230.

+1 thanks on having a sweet car, you got the xi , but i just have that urge of "why" you know? i just need to get that answered. i only plan on doing the following engine mods to the car, ss exhaust, sstt, forge, gruppe m intake or afe when it is out or the se filter, and a intercooler. after that i plan on just doing cosmetics c/f engine cover, oem bmw c/f strut, m body kitk c/f interior, etc.

[hl0m4n]

btw thanks for the help once again. i will have to check the vacuum line tommorow morning to see if the plug is still in there. i really want to figure this out.

its supposed to snow tommorow here in NY 4-7 inches. im planning to get another dyno early morning to match the humidity and temp factor like my original.

based on everybody comments i get see its either the vaccum line or a loose bolt causing a minor leak.

[fedinand]

Originally Posted by hl0m4n

why do you lose power if the black line is open?

I'm not understanding why this would affect the power since the aftermarket exhaust doesn't have the oem set-up. There would be nothing for the solenoid to control - no valve to open

[hotrod2448]

Originally Posted by fedinand

I'm not understanding why this would affect the power since the aftermarket exhaust doesn't have the oem set-up. There would be nothing for the solenoid to control - no valve to open

It's not the lack of the valve that's the problem it's not plugging the vacuum line after removing the valve and having a vacuum leak that's the problem.

[hl0m4n]

damn im stupid. i forgot i have rogue engineering just 17 miles from me...they could have done the install...damnit i gotta go there from now on and get dyno at ics or tt.

[hl0m4n]

hey also how does disconnecting the battery help the exhaust?

[hotrod2448]

It resets the computer and puts it back on it's aggressive map in case it changed maps for some reason.

[hl0m4n]

Originally Posted by hotrod2448

It resets the computer and puts it back on it's aggressive map in case it changed maps for some reason.

thanks im going back on monday and redynoing on tues. going to rogue engineering .

1. check for install problems, leaks, etc.
2. insert 7/32" ball bearing in vac. line.
3. disconnect batter for 15 minutes and drive around.
4. redyno next day.
5. report back to e90post

[hotrod2448]

If you are using another dyno than the one you originally did you really can't compare the numbers.

[hl0m4n]

Originally Posted by hotrod2448

If you are using another dyno than the one you originally did you really can't compare the numbers.

of course same dyno. i only have two dynojet centers near me so not many options for me.

[hl0m4n]

got back from the shop today.

1. check for install problems, leaks, etc: Done, everything OK.
2. insert 7/32" ball bearing in vac. line: Done (golf tee mod)
3. disconnect battery for 15 minutes and drive around. Done and drove about 300 miles so far.
4. redyno next day.: Comming
5. report back to e90post: Comming

hopefully this will solve problem. im afraid to ask but, if not what can it be?

[Rips335iCoupe]

Originally Posted by hl0m4n

got back from the shop today.

1. check for install problems, leaks, etc: Done, everything OK.
2. insert 7/32" ball bearing in vac. line: Done (golf tee mod)
3. disconnect battery for 15 minutes and drive around. Done and drove about 300 miles so far.
4. redyno next day.: Comming
5. report back to e90post: Comming

hopefully this will solve problem. im afraid to ask but, if not what can it be?

Just some sort of anomaly with your baseline dyno .... First baseline dyno is incorrect, and it shows higher HP numbers then you should of had. To bad you can't prove that, since the exhaust is already on.