3rd Generation Specific (1993-2002) 1993-2002 Discussion including performance modifications and Technical Support Sections.
Sponsored by:

New Exhaust

Thread Tools
 
Search this Thread
 
Old 07-27-08, 03:45 PM
  #26  
Senior Member

 
trickshot's Avatar
 
Join Date: Dec 2001
Location: My way, the highway.
Posts: 326
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by Cyber_RX7
Thanks for that Gordon.
Because I have replace the cat aswell as the back section (the only thing I haven't changed is the downpipe) I think I will invest in a decent boost controller.

Oops. It appears ol' gmonsen didn't read your posts thoroughly enough or he would have caught that. It's sad when he embarrasses himself like that. LOL!
Old 07-27-08, 03:47 PM
  #27  
sleeper
iTrader: (6)
 
4CN A1R's Avatar
 
Join Date: Oct 2007
Location: Abbottstown, PA
Posts: 1,957
Likes: 0
Received 3 Likes on 3 Posts
Originally Posted by SLOASFK
A Power FC can only control boost as well as the waste gate will allow. With a stock wastegate, you'll have the same problem with the PFC as you would with the stock ECU. What the PFC allows for is tuning for higher boost levels, provided you have the fuel system to support higher boost.

Really, to run a midpipe and control boost 100%, you have to have a ported wastegate. Anything else will be risking your motor.
partially true...

you can NEVER totally eliminate boost creep after taking the out the midpipe. even those with ported wastegates have boost creep on cold days.

in any circumstances...even without wastegate porting, you can protect your motor. there are some who(on the stock ecu) run full exhaust and take the restrictor pills out of the wastgate and prespool vac lines. this causes them to run 7-8psi at wot. it does creep, of cource, but never past 10psi.
Old 07-27-08, 04:10 PM
  #28  
Junior Member
Thread Starter
 
Cyber_RX7's Avatar
 
Join Date: Jul 2008
Location: United Kingdom
Posts: 29
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by trickshot
LOL! I read quite well, thank you.

You, yourself, in your initial post speculated it might be a "stupid idea." Right the first time, Cyber.

You could have easily purchased a nice flowing exhaust system that wouldn't have required you to turn around, take a step backward, and restrict this new exhaust system of yours.
I didn't say you couldn't read. I simply asked if you had even read my post.

I also 'stated' that my stock exhaust was falling to bits and it seriously was. I knew it was bad but not as bad as I thought when I got to have a good look at it when I took it off. It had holes all over it and there was not one bit that had not rusted 100%. There was no point in going and purchasing a 'nice flowing' exhaust when I do eventually want to sort it out. I do eventually want to purchase a new fuel pump etc. I just thought your post was very unhelpful and very sarcastic. sorry but thats how it sounded.


you can protect your motor. there are some who(on the stock ecu) run full exhaust and take the restrictor pills out of the wastgate and prespool vac lines. this causes them to run 7-8psi at wot. it does creep, of cource, but never past 10psi.
restrictor pills and prespool vac lines?? Would I have to take the rex to a specialist to have this done. As Already mentioned, I am taking it to WGT sometime early next month. Would it be worth asking them to do this for me and how much roughly would I be looking at?
Old 07-27-08, 04:25 PM
  #29  
sleeper
iTrader: (6)
 
4CN A1R's Avatar
 
Join Date: Oct 2007
Location: Abbottstown, PA
Posts: 1,957
Likes: 0
Received 3 Likes on 3 Posts
Originally Posted by Cyber_RX7

restrictor pills and prespool vac lines?? Would I have to take the rex to a specialist to have this done. As Already mentioned, I am taking it to WGT sometime early next month. Would it be worth asking them to do this for me and how much roughly would I be looking at?
there are 1 pills in the wastegate line and 1 in the prespool vacuum line. they restrict boost. if you open up the passage (creating less pressure) the boost decreases. these are the 2 lines:



they will be black and much shorter on your car. when you install a boost controller you tap the wastegate line...it is a temporary option if you do plan on eventually doing something about your boost creep. dont hire someone to do it..its very simple. you can disconnect the lines and replace them with a silcone hose that contains no pill. that simple
Old 07-27-08, 04:29 PM
  #30  
Junior Member
Thread Starter
 
Cyber_RX7's Avatar
 
Join Date: Jul 2008
Location: United Kingdom
Posts: 29
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by 4CN A1R
there are 1 pills in the wastegate line and 1 in the prespool vacuum line. they restrict boost. if you open up the passage (creating less pressure) the boost decreases. these are the 2 lines:



they will be black and much shorter on your car. when you install a boost controller you tap the wastegate line...it is a temporary option if you do plan on eventually doing something about your boost creep. dont hire someone to do it..its very simple. you can disconnect the lines and replace them with a silcone hose that contains no pill. that simple
Spot on diagram mate and thanks ffor that!! I will have a look this week. I already have some 4mm vac hose as I needed it for one of the bov's.

Thanks so much for your help
Old 09-17-08, 05:05 PM
  #31  
Senior Member

iTrader: (3)
 
JyRO's Avatar
 
Join Date: Aug 2005
Location: Peachtree City, GA
Posts: 275
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by 4CN A1R
partially true...

you can NEVER totally eliminate boost creep after taking the out the midpipe...
I believe the guys I've sold my restrictor plates to would likely disagree with this statement.

Analytically, porting the wastegate is a superior choice to a restrictor plate. However, if time or money is a concern to you, my restrictor plates beat the hell out of pulling turbos and porting.

When I get deeper into the engine side of my car (so far the bulk of my money & time has went into paint & body as I bought my car crashed), I will likely port my wastegate.

Until then, my own restrictor plate completely controls my creep. Now spike, that's a different animal.

Cyber - You can make a restrictor plate. You might spend more money making a decent one and guessing at a port size, then you could to buy a set of 3 from me. As for a 2" hole, I'll just say that in my experience in tuning my port sizes, a 2" hole will control your creep. OK, I'll be nice. A 2" hole will also control your hp too, control it way down. Please don't buy plates from me if you can afford porting, or can make your own. This was not a sales pitch.

I don't remember reading if you have to meet emissions in the UK or not. I'm assuming that you do. In that case, run the main cat with a 6" exhaust if you want, and still you'll likely not have creep. Restrictor plates will not be needed. Spike, well others know more than I.

I'm going to figure that out as well. I'm going to have to. I know what the problem is, but the best way to defeat it, I'm still working on. I've got a valve on my pre-spool line to control spike, but it is not sensitive enough. Too easy to go from low boost back to boost spike. So I've got work to do.

Take a few minutes to click the link in my sig and read. If you need to pass emissions, and will run the main cat, you won't need restrictor plates or porting.

Good luck!
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Ian_D
New Member RX-7 Technical
6
09-06-15 10:38 PM
doritoloco
New Member RX-7 Technical
7
09-05-15 12:41 PM
FührerTüner
General Rotary Tech Support
3
09-04-15 01:41 PM



Quick Reply: New Exhaust



All times are GMT -5. The time now is 01:51 PM.