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Technical Chat Ask and answer technical car questions. |
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2006-05-03, 01:52 PM | #1 |
Candy Mountain
Real Name: Cody Join Date: May 2005
Location: Californication
Posts: 7,751
Car: 03 Pussy Wagon, now with more pink!
Class: TESP
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It's gotta be pre-turbo...UP maybe.
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2006-05-03, 02:03 PM | #2 |
EJ205
Join Date: May 2003
Location: Reno, NV
Posts: 1,196
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There is no way your boost would be limited by any sort of leak post-turbo. People take off their exhausts to gain better performance at the track (on a turbo car). Like I said, it either has to be a manifold problem or wastegate problem... or just a buggy-eye problem.
Check your wastegate - it could be malfunctioning and opening early. You could also check your boost controller itself - that could be off. I've had my turbo/manifold gasket become vapor (it boke apart and nothing was left) before without having it effect my boost.
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Turbo is a decent with modification. |
2006-05-03, 02:12 PM | #3 | |
Candy Mountain
Real Name: Cody Join Date: May 2005
Location: Californication
Posts: 7,751
Car: 03 Pussy Wagon, now with more pink!
Class: TESP
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Quote:
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Slow and low, that is the tempo. |
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2006-05-03, 02:25 PM | #4 | |
The Doink
Real Name: Scott Join Date: Nov 2002
Location: Portland, OR
Posts: 20,335
Car: '09 OBXT, '02 WRX, '96 Miata
Class: PDX/TT-6
The way out is through
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Quote:
Also, taking off my exhaust would certainly *not* help my performance, unless melting wiring and setting the car on fire w/ 1000F exhaust gases blowing directly into the firewall/wiring harness is the new JDM way to go faster. My boost controller is the stock ECU. I highly doubt the electrons in the ECU are broken... especially when my issues appeared just as my exhaust leak got louder. The most likely culprit is that my header/up-pipe gasket has failed. I've had that happen before, and the result was the same loud exhaust and limited boost. Nothing that a quick trip to Litha and 10 minutes under the car won't fix.
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2006-05-03, 02:28 PM | #5 |
Candy Mountain
Real Name: Cody Join Date: May 2005
Location: Californication
Posts: 7,751
Car: 03 Pussy Wagon, now with more pink!
Class: TESP
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I'm 99% this won't help, but I do have a Cu-Seal Copper gasket for the DP to turbo joint if you need it and it would even fit your car.
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Slow and low, that is the tempo. |
2006-05-03, 02:36 PM | #6 | |
The Doink
Real Name: Scott Join Date: Nov 2002
Location: Portland, OR
Posts: 20,335
Car: '09 OBXT, '02 WRX, '96 Miata
Class: PDX/TT-6
The way out is through
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Quote:
I was seeing 1900F EGTs because I had my skid plate installed and it was retaining too much heat from the headers. Getting everything that hot, then letting it cool, and repeating like 10 times over the weekend probably just loosened up the bolts in my exhaust system.
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2006-05-03, 02:45 PM | #7 |
Candy Mountain
Real Name: Cody Join Date: May 2005
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That's hot.
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2006-05-03, 03:53 PM | #8 | |
EJ205
Join Date: May 2003
Location: Reno, NV
Posts: 1,196
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Quote:
I just dont see how an exhaust leak AFTER the turbo would effect boost like its doing in your case. Why dont you slap a boost controller on there? If you take it to Lithia and they fix your leak, let me know. I'm interested if that will cure your boost problem.
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Turbo is a decent with modification. |
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2006-05-03, 04:02 PM | #9 | |
warehouse SECCS
Join Date: Mar 2003
Location: SoCal...
Posts: 6,253
Car: 04 Evo 99 Cadillac
Class: street de le mod
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Quote:
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Anjali? Anjali? |
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2006-05-03, 04:05 PM | #10 | |
The Doink
Real Name: Scott Join Date: Nov 2002
Location: Portland, OR
Posts: 20,335
Car: '09 OBXT, '02 WRX, '96 Miata
Class: PDX/TT-6
The way out is through
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Quote:
I don't slap a boost controller on my car because I'd rather not blow up another motor. I figure the ECU and EBC already built into the car were engineered far better than a spring and ball bearing. Though, if you'd like one, I've got a TurboXS MBC sitting in a drawer in my garage. Lithia won't ever touch my car. Not just because they wouldn't have a clue what to do after popping the hood, but because I barely trust professional race car builders w/ it, let alone some yahoo techs. The only reason I'd go to Lithia is to buy a new gasket that I'd install myself, in my garage... it takes like 10 minutes.
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2006-05-03, 04:07 PM | #11 |
Candy Mountain
Real Name: Cody Join Date: May 2005
Location: Californication
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Car: 03 Pussy Wagon, now with more pink!
Class: TESP
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How much you want for the MBC?
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Slow and low, that is the tempo. |
2006-05-03, 04:08 PM | #12 | |
The Doink
Real Name: Scott Join Date: Nov 2002
Location: Portland, OR
Posts: 20,335
Car: '09 OBXT, '02 WRX, '96 Miata
Class: PDX/TT-6
The way out is through
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Quote:
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2006-05-04, 06:44 AM | #13 | |
Token
Real Name: Le Stig Afrique? Join Date: Jun 2005
Location: sitting next to a big yellow box
Posts: 3,589
Car: 2001 Impreza 2.5 RS
Class: 05 TDSP
No, I won't work on your car. F* your car
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No shit on that one! My buddy and his friend who both work down there came here yesterday, (the yellow MR2 and the red L with the green door from auto-x) and they were looking at the Z racecar I've got sitting here. They both turned green in the face looking at that thing! Those guys are TERRIFIED by aftermarket goodies. Something as modified as your car would make them water their pants!
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2006-05-04, 07:28 AM | #14 |
EJ205
Join Date: May 2003
Location: Reno, NV
Posts: 1,196
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Thanks for the offer, but I already have a decent electronic boost controller.
What kind of sensor does the car have to measure pressure in the exhaust system?
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Turbo is a decent with modification. |
2006-05-04, 09:42 AM | #15 | |
The Doink
Real Name: Scott Join Date: Nov 2002
Location: Portland, OR
Posts: 20,335
Car: '09 OBXT, '02 WRX, '96 Miata
Class: PDX/TT-6
The way out is through
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Quote:
No really, the car uses both Mass Airflow and Manifold Absolute Pressure sensors to determine the load/pressure on the car. I assume the MAP sensor works fine as input for the ECU to allow it to properly control the turbo's wastegate. Also, I figured out the leak. The flex joint on my up-pipe has a hole in it: While I was under there, I also noticed that my timing belt cover didn't quite like the heat from my headers: I ordered a Bosal uppipe, since it's got the heatshields on it... hopefully it's not a total piece of junk. And depending on how hard the timing cover replacement job is, I'm either gonna hit up Lithia for a new one and do the install myself, or haul the car back down to Gruppe-S for a repair. Now the question is, what caused the up-pipe flex joint to fail? Was it debris? I've got a skid plate I was hoping to use to protect the underside of the car, but I think it was the skid plate reflecting all the heat from the headers that melted the timing cover. At least taking the skid plate off was good for lowering my EGT's by 200F... so it's certainly having a major effect on the under-hood temps. I wonder if there's a way to use the skid plate with some ventilation to keep things cool... 'course if the problem is radiant heat, no amount of ventilation is really going to make a big difference.
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2006-05-04, 10:02 AM | #16 |
Candy Mountain
Real Name: Cody Join Date: May 2005
Location: Californication
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Car: 03 Pussy Wagon, now with more pink!
Class: TESP
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Flex joints will fail.
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Slow and low, that is the tempo. |
2006-05-04, 10:04 AM | #17 | |
The Doink
Real Name: Scott Join Date: Nov 2002
Location: Portland, OR
Posts: 20,335
Car: '09 OBXT, '02 WRX, '96 Miata
Class: PDX/TT-6
The way out is through
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Quote:
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2006-05-04, 10:07 AM | #18 | |
Candy Mountain
Real Name: Cody Join Date: May 2005
Location: Californication
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Car: 03 Pussy Wagon, now with more pink!
Class: TESP
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That does suck though Scott. The one UP install I've done (on my car) was time consuming.
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Slow and low, that is the tempo. |
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2006-05-04, 10:21 AM | #19 |
JDM Cowboy
Real Name: Nick Join Date: Oct 2003
Location: Somewhere
Posts: 8,642
Car: 2015 Mazda 3
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Yeah, thats what I've always heard. Maybe 2-3 years out of a flex joint sometimes.
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While a standard engine is powered by a belt connected to the crankshaft, a turbo engine runs on its own exhaust steam, making it more energy efficient. -- CNN |
2006-05-04, 11:04 AM | #20 |
Token
Real Name: Le Stig Afrique? Join Date: Jun 2005
Location: sitting next to a big yellow box
Posts: 3,589
Car: 2001 Impreza 2.5 RS
Class: 05 TDSP
No, I won't work on your car. F* your car
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If I recall correctly, one half of the timing cover is hard to replace, and the other is pretty easy, but I can't remember which is which... Helps a lot huh?
Maybe having some louvers pressed into the skid plate to help direct some air in there, while still providing impact protection would help. Even if radiant heat is the problem, the cool(er) air being forced in while the car's in motion would likely still drop the temps some. (?)
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"...these condoms have a topical anesthetic to reduce sensitivity, so you can last longer. What a paradox. You can't feel a thing, but you can f*ck for HOURS..." |
2006-05-04, 11:19 AM | #21 |
The Don
Real Name: Aaron Join Date: Oct 2003
Location: Sacramento
Posts: 3,097
Car: '97 Legacy / '05 FXT
Class: low
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Yeah, I was thinking about the louvers too.......there's enough street rod shops that someone should be able to bust it out pretty easily, but that' snormally in thin sheetmetal, not 3/16" aluminum plate.
Plus, having the louvers facing forward would be better for cooling, but will also scoop up water and catch other stuff as well... Scott, you need a 1/2" holesaw. Speedholes FTW!
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2006-05-04, 11:36 AM | #22 |
Token
Real Name: Le Stig Afrique? Join Date: Jun 2005
Location: sitting next to a big yellow box
Posts: 3,589
Car: 2001 Impreza 2.5 RS
Class: 05 TDSP
No, I won't work on your car. F* your car
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Yeah, I thought of the catching water and crap. Kinda shoots it in the foot. I wasn't sure how thick that skid plate was either, and that's def. an issue! I dunno, just throwing ideas out there!
__________________
"...these condoms have a topical anesthetic to reduce sensitivity, so you can last longer. What a paradox. You can't feel a thing, but you can f*ck for HOURS..." |
2006-05-04, 12:06 PM | #23 |
The Doink
Real Name: Scott Join Date: Nov 2002
Location: Portland, OR
Posts: 20,335
Car: '09 OBXT, '02 WRX, '96 Miata
Class: PDX/TT-6
The way out is through
|
I was thinking about some brake-duct like ducts sending air over the headers... but I think I'm probably just going to run w/o the skid plate. It's heavy and hot... and there's not that much debris on the track, unless I go off.
If anyone wants a nice Primitive skid plate, let me know! It's only been used for about 20 track miles. As far as the timing cover. The outter cover is a breeze to install. The inner cover requires taking off the timing belt and cam gears. I was just at Lithia ordering the parts. I'm gonna try to do the repair myself, since I can't get down to Gruppe-S easily and since they can't get me in until the end of next week, which will cut it too close to the autocross. The parts aren't expensive, unless of course I botch the timing belt install... in which case it will be extremely expensive. Hey Cory, you got time to lend me some expertice?
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2006-05-04, 12:28 PM | #24 |
Token
Real Name: Le Stig Afrique? Join Date: Jun 2005
Location: sitting next to a big yellow box
Posts: 3,589
Car: 2001 Impreza 2.5 RS
Class: 05 TDSP
No, I won't work on your car. F* your car
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When are you doing it dude? I can probably swing by and give a hand! Give me a call if you need!
__________________
"...these condoms have a topical anesthetic to reduce sensitivity, so you can last longer. What a paradox. You can't feel a thing, but you can f*ck for HOURS..." |
2006-05-04, 12:47 PM | #25 | |
The Doink
Real Name: Scott Join Date: Nov 2002
Location: Portland, OR
Posts: 20,335
Car: '09 OBXT, '02 WRX, '96 Miata
Class: PDX/TT-6
The way out is through
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Quote:
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