6p turbo, RB exhaust, intake, no emissions, 5psi??
#1
Infinite Rotary Resolve
Thread Starter
iTrader: (1)
Join Date: Jul 2003
Location: Nashville, TN
Posts: 1,042
Likes: 0
Received 0 Likes
on
0 Posts
6p turbo, RB exhaust, intake, no emissions, 5psi??
Newly converted 6p turbo question.
3rd gear from around 2000 boost rises to up to 5, then stays solid. I was under the impression the with my exhaust I should be higher than stock, but now it seems I can't even get to stock levels. What potential issues could there be?
wastegate spring? I did dip the actuator in the parts washer to clean it up, any chance I damaged it?
bov leak? Aren't stock BOV's pretty decent?
What do you guys think??
I have a wideband it read low 12s high 11s once I get into boost
My mods:
s5 6p t2 (w/ japan2la LIM) (stock t2 UIM, TB w/ mod, intercooler)
stock turbo
ported wastegate
no emissions
ebay TID
stock BOV plumbed into TID
RB DP, Borla midpipe, RB duals
N370 ECU
HKS FCD
HKS FCON (setting 2, chip unknown) with GCC (untouched atm)
3rd gear from around 2000 boost rises to up to 5, then stays solid. I was under the impression the with my exhaust I should be higher than stock, but now it seems I can't even get to stock levels. What potential issues could there be?
wastegate spring? I did dip the actuator in the parts washer to clean it up, any chance I damaged it?
bov leak? Aren't stock BOV's pretty decent?
What do you guys think??
I have a wideband it read low 12s high 11s once I get into boost
My mods:
s5 6p t2 (w/ japan2la LIM) (stock t2 UIM, TB w/ mod, intercooler)
stock turbo
ported wastegate
no emissions
ebay TID
stock BOV plumbed into TID
RB DP, Borla midpipe, RB duals
N370 ECU
HKS FCD
HKS FCON (setting 2, chip unknown) with GCC (untouched atm)
#3
Infinite Rotary Resolve
Thread Starter
iTrader: (1)
Join Date: Jul 2003
Location: Nashville, TN
Posts: 1,042
Likes: 0
Received 0 Likes
on
0 Posts
it's that simple? Could you explain a little please? I'm new to turbo's so i'm not disagreeing, I just wasn't expecting that. so chances are nothing is wrong?
Also, I have a friend with a full t2 motor that was running 6 psi until he put a new exhaust on (apexi single) and also ported the wastegate and now he is running close to 10. stock otherwise.
Also, I have a friend with a full t2 motor that was running 6 psi until he put a new exhaust on (apexi single) and also ported the wastegate and now he is running close to 10. stock otherwise.
#5
Lives on the Forum
iTrader: (8)
You have an NA block with diffusers in the exhaust ports. These block a little of the airflow velocity to the turbos. I wouldnt be surprised if you only saw low boost without a controller.
Sometimes stock turbo cars will not build a lot of boost, and cannot hold it until redline. Other times cars with almost the same setup will boost insanely and out of control. Every setup is different. The only way to have excellent boost control is with an external wastegate on a full aftermarket turbo.
Sometimes stock turbo cars will not build a lot of boost, and cannot hold it until redline. Other times cars with almost the same setup will boost insanely and out of control. Every setup is different. The only way to have excellent boost control is with an external wastegate on a full aftermarket turbo.
#6
Infinite Rotary Resolve
Thread Starter
iTrader: (1)
Join Date: Jul 2003
Location: Nashville, TN
Posts: 1,042
Likes: 0
Received 0 Likes
on
0 Posts
makes sense... I haven't gone to redline yet... we'll see
side question.
I am running premix as I put on new omp lines and they haven't filled yet.
One is full, while the others aren't 3/4 full, one hasn't moved in a while... how long should it take, and if something is wrong, like I think there is, bad omp maybe?
I do not have the vacuum spider and the omp tops are capped, could this be the cause??
bad omp nozzles??
side question.
I am running premix as I put on new omp lines and they haven't filled yet.
One is full, while the others aren't 3/4 full, one hasn't moved in a while... how long should it take, and if something is wrong, like I think there is, bad omp maybe?
I do not have the vacuum spider and the omp tops are capped, could this be the cause??
bad omp nozzles??
Trending Topics
#8
Infinite Rotary Resolve
Thread Starter
iTrader: (1)
Join Date: Jul 2003
Location: Nashville, TN
Posts: 1,042
Likes: 0
Received 0 Likes
on
0 Posts
After maybe 50 miles of driving only one has filled up, or at least to the point where it goes under the mani where I can't see it.
*The injectors tested ok from what I remember (blow/suck test). I'd be willing to replace them with known good ones just to be sure
* no noticeable leaks
* omp maybe? I have 2 spares i could try
Last edited by Fero313; 10-10-07 at 01:54 AM.
#11
Infinite Rotary Resolve
Thread Starter
iTrader: (1)
Join Date: Jul 2003
Location: Nashville, TN
Posts: 1,042
Likes: 0
Received 0 Likes
on
0 Posts
i'll be fixing the omp stuff later... premixing until then.
Landers knows the future. not only am I only boosting 5psi, between 5k and 6k I start losing boost... 7k yields about 2-3 psi. damn.
Landers knows the future. not only am I only boosting 5psi, between 5k and 6k I start losing boost... 7k yields about 2-3 psi. damn.
#12
Lives on the Forum
iTrader: (8)
Do you have any intake or exhaust restrictions? Even with a stock catback, main cat, and air filter you should see 5psi across the board.
You must have a boost leak somewhere. Use an air compressor, turn your regulator down to 25psi, put a coupler on the front of the turbo, and rig up a plug/cap with an air fitting in it so you can pressurize the intake tract post-turbo. You'll find leaks this way. It's normal for a little air to hiss as it goes through the throttlebody.
You must have a boost leak somewhere. Use an air compressor, turn your regulator down to 25psi, put a coupler on the front of the turbo, and rig up a plug/cap with an air fitting in it so you can pressurize the intake tract post-turbo. You'll find leaks this way. It's normal for a little air to hiss as it goes through the throttlebody.
#13
Infinite Rotary Resolve
Thread Starter
iTrader: (1)
Join Date: Jul 2003
Location: Nashville, TN
Posts: 1,042
Likes: 0
Received 0 Likes
on
0 Posts
I have a RB 2.5 DP, borla midpipe (see-thru), and what I assume is a "n/a" RB catback. no cats. I wouldn't expect the n/a catback to be restrictive for 5psi.
I made an adapter while I was at work today to seal up the intake and allow an air fitting to pressurize the intake. Whenever I get chance I will see if there are any boost leaks.
(if anyone cares the adapter is a 2 1/2 to 2 inch exhaust reducer with a rubber expansion plug in the small end, and a hose barb that I will braze into the pipe. The leak will happen around 5psi, but I will still take care in making sure the freeze plug doesn't shoot off and hit me in the junk or something)
I made an adapter while I was at work today to seal up the intake and allow an air fitting to pressurize the intake. Whenever I get chance I will see if there are any boost leaks.
(if anyone cares the adapter is a 2 1/2 to 2 inch exhaust reducer with a rubber expansion plug in the small end, and a hose barb that I will braze into the pipe. The leak will happen around 5psi, but I will still take care in making sure the freeze plug doesn't shoot off and hit me in the junk or something)
#17
Infinite Rotary Resolve
Thread Starter
iTrader: (1)
Join Date: Jul 2003
Location: Nashville, TN
Posts: 1,042
Likes: 0
Received 0 Likes
on
0 Posts
my apparatus for checking boost. apart from the hoses before the turbo blowing off because the pipes don't have beads and scaring the hell out of me, the only one I found was the nipple on the back of the bov pipe. I fixed it. Boost at second gear redline was 3-5 as the road was not ideal and I couldn't watch the gauge intently.
Earlier in the day I took the hose off the wastegate and drove CAREFULLY!!! Boost rose with no apprehension past 5 and went to 10 with no problem. So, apparently the wastegate is doing its job. Should the spring be that weak or is that normal pressure for it to open??
by the way, is there any way to get my sig on my first post but not the rest??
#20
Infinite Rotary Resolve
Thread Starter
iTrader: (1)
Join Date: Jul 2003
Location: Nashville, TN
Posts: 1,042
Likes: 0
Received 0 Likes
on
0 Posts
i didn't want to believe you... I wanted to be able to fix something and boost 8-10
ok next one... what are the possibles for me losing boost at high rpms?? If i can't hold 5psi, then a boost controller would do no good
goods
*no more boost leaks
*can go past 5psi
*bov is working
*open exhaust (DP, no cats, straight thru borla, RB back)
bads
*losing psi at high rpms
*exhaust diffuzers still in
*stock turbo, a little play, not smoking
*running rich, 10s-11s at idle, 10s WOT (waiting to adjust FCON when everything else is fixed)
ok next one... what are the possibles for me losing boost at high rpms?? If i can't hold 5psi, then a boost controller would do no good
goods
*no more boost leaks
*can go past 5psi
*bov is working
*open exhaust (DP, no cats, straight thru borla, RB back)
bads
*losing psi at high rpms
*exhaust diffuzers still in
*stock turbo, a little play, not smoking
*running rich, 10s-11s at idle, 10s WOT (waiting to adjust FCON when everything else is fixed)
#22
Crash Auto?Fix Auto.
iTrader: (3)
No, a boost controller would let you run 10psi for as long as the turbo will flow it. Thats helpful.
I don't know what you wanna know? Its working fine, if you want more boost adda boost controller? Good work on the Turbo'd/NA??
#23
Infinite Rotary Resolve
Thread Starter
iTrader: (1)
Join Date: Jul 2003
Location: Nashville, TN
Posts: 1,042
Likes: 0
Received 0 Likes
on
0 Posts
i am not holding 5psi at high rpm... thats the problem. I want to know what could cause 3-5 psi at high rpm, because if I turn boost up to say, 10, and still get 3-5 psi at high rpm, it defeats the purpose of turning it up to begin with.
before anyone says anything, I'm not complaining, i'm troubleshooting and learning. thanks for the compliment by the way. I have alot of hours in it.
before anyone says anything, I'm not complaining, i'm troubleshooting and learning. thanks for the compliment by the way. I have alot of hours in it.
#24
Crash Auto?Fix Auto.
iTrader: (3)
Well, the fact that the boost bleeds down up high in the RPM's is a factor of the turbo istelf since it can't flow enough air. Admittedly, at 5psi, you should see near that to redline in the lower gears (ie. 3-4psi at 7K in 2nd)
However, upping to 10-11psi should net you 8 or so pounds by redline. There will be no correcting this until there is a different aftermarket or hrybrid turbo on there. But in short, upping the boost with either a manual or electronic boost conrollter will net more boost all around. However, the bleed off up top will stil lbe present, it will just be raised proportionally.
However, upping to 10-11psi should net you 8 or so pounds by redline. There will be no correcting this until there is a different aftermarket or hrybrid turbo on there. But in short, upping the boost with either a manual or electronic boost conrollter will net more boost all around. However, the bleed off up top will stil lbe present, it will just be raised proportionally.