Riv Performance
Would you like to react to this message? Create an account in a few clicks or log in to continue.

The 8th Gen Riviera Resource
 
HomeDashboardLatest imagesSearchRiviera Questions & AnswersWrite-Ups IndexRegisterRelated LinksLog in

 

 High Boost - Could it be my exhaust?

Go down 
5 posters
AuthorMessage
1998 Riv
Expert
1998 Riv


Name : Dave
Age : 62
Location : In The AZ Oven
Joined : 2007-01-17
Post Count : 4502
Merit : 44

High Boost - Could it be my exhaust? Empty
PostSubject: High Boost - Could it be my exhaust?   High Boost - Could it be my exhaust? EmptyTue Aug 19, 2008 4:14 pm

Made time to do a quick scan a few days ago, and with my 3.8 pulley back on the car due to KR issues, I saw boost as high as almost 9 psi! A stock pulley shouldn't be getting that high. Some W-body guys I know suggested my exhaust could be the reason for my KR, seeing as my boost #'s are that high on a stock pulley. At WOT I mostly saw ZERO KR. KR started at about 30% TPS, and went away just after I hit 100% TPS, and stayed at zero until I let off the gas around 95mph.

Here's the scan I logged:

http://www.scandepot.net/viewscan.php?pk=5282
Back to top Go down
Chicken
Aficionado
Chicken


Name : Mark
Age : 57
Location : Montana
Joined : 2008-06-13
Post Count : 1296
Merit : 8

High Boost - Could it be my exhaust? Empty
PostSubject: Re: High Boost - Could it be my exhaust?   High Boost - Could it be my exhaust? EmptyTue Aug 19, 2008 4:17 pm

Dave are your IAT Temps really that high?
Back to top Go down
http://profile.myspace.com/index.cfm?fuseaction=user.viewprofile
1998 Riv
Expert
1998 Riv


Name : Dave
Age : 62
Location : In The AZ Oven
Joined : 2007-01-17
Post Count : 4502
Merit : 44

High Boost - Could it be my exhaust? Empty
PostSubject: Re: High Boost - Could it be my exhaust?   High Boost - Could it be my exhaust? EmptyTue Aug 19, 2008 4:21 pm

It was a hot and humid day, I had to drive a slow 10-15 minutes in town before heading a couple miles out of town where I could make a run. No time for it to cool down, as I was on my way back to work at noon. So yes, that was actual IAT during that run.

On Sunday I added DEI Cool Tape heat reflective tape to my SS intake tube, and I could see how much faster the IAT dropped on the hwy, but in town it still gets pretty warm.
Back to top Go down
1998 Riv
Expert
1998 Riv


Name : Dave
Age : 62
Location : In The AZ Oven
Joined : 2007-01-17
Post Count : 4502
Merit : 44

High Boost - Could it be my exhaust? Empty
PostSubject: Re: High Boost - Could it be my exhaust?   High Boost - Could it be my exhaust? EmptyTue Aug 19, 2008 4:25 pm

BTW, my exhaust consists of the stock rear manifold, 3" Hogan DP, 3" hi flow Magnaflow cat, stock resonator, and stock the rest of the way back. I'm wondering if the res on back could be an issue. Running a STOCK pulley, I wouldn't think so, but... I've opened up the intake side with the FWI, coated Plog on the front, maybe I need to work farther back on the exhaust.
Back to top Go down
1998 Riv
Expert
1998 Riv


Name : Dave
Age : 62
Location : In The AZ Oven
Joined : 2007-01-17
Post Count : 4502
Merit : 44

High Boost - Could it be my exhaust? Empty
PostSubject: Re: High Boost - Could it be my exhaust?   High Boost - Could it be my exhaust? EmptyTue Aug 19, 2008 4:27 pm

I wish we had a local tuning shop like Intense that could spend some time on a tune. Yes I have a PT, but No Time to learn to use it, and actually put it to use. I suspect if I changed the timing tables back to stock, much of my KR would disappear.
Back to top Go down
Chicken
Aficionado
Chicken


Name : Mark
Age : 57
Location : Montana
Joined : 2008-06-13
Post Count : 1296
Merit : 8

High Boost - Could it be my exhaust? Empty
PostSubject: Re: High Boost - Could it be my exhaust?   High Boost - Could it be my exhaust? EmptyTue Aug 19, 2008 4:31 pm

I think that would be the first thing I would try
Back to top Go down
http://profile.myspace.com/index.cfm?fuseaction=user.viewprofile
1998 Riv
Expert
1998 Riv


Name : Dave
Age : 62
Location : In The AZ Oven
Joined : 2007-01-17
Post Count : 4502
Merit : 44

High Boost - Could it be my exhaust? Empty
PostSubject: Re: High Boost - Could it be my exhaust?   High Boost - Could it be my exhaust? EmptyTue Aug 19, 2008 4:54 pm

I've also read 2 opinions on the need to skew injectors when running a Plog. Could also be a component of the problem. But, I also had some KR before doing the Plog install.
Back to top Go down
AA
Administrator
AA


Name : Aaron
Age : 46
Location : C-bus, Ohio
Joined : 2007-01-13
Post Count : 18438
Merit : 248

High Boost - Could it be my exhaust? Empty
PostSubject: Re: High Boost - Could it be my exhaust?   High Boost - Could it be my exhaust? EmptyTue Aug 19, 2008 5:26 pm

We know you had a KR problem before the FWI. I think bringing in more air through the intake throws your tune out of wack, and KR will rise. It looks like you're running lean with O2 numbers in the 905 range, and LTFT locked at 7.8 during WOT. That's bad stuff. The IAT being that high is also not good. I've seen KR in 1st gear after sitting idle for a minute on hot days, then it goes away after IAT comes down. I will not run WOT if AIT is over 100 F.

I had a problem with KR creeping up on me slowly over time. The new injectors solved the problem for me. I know it's a bit of money, but as long as you're running lean, this isn't going to get any better. Sounds like it's getting a bit worse.

_________________
'05 GTO 6.0L • 6-spd • 95k miles • 0-60: 4.8s • 16.9 avg MPG • Nelson Ledges Lap: 1:26

'95 Celica GT 2.2L • 5-spd • 165k miles • 0-60: yes

'98 SC Riviera • 281k miles • 298 HP/370 TQ • 0-60: 5.79s • ET: 13.97 @ 99.28 • 4087 lb • 20.1 avg MPG • Nelson Ledges Lap: 1:30
3.4" pulley • AL104 plugs • 180º t-stat • FWI w/K&N • 1.9:1 rockers • OR pushrods • LS6 valve springs • SLP headers • ZZP fuel rails
KYB GR2 struts • MaxAir shocks • Addco sway bars • UMI bushings • GM STB • Enkei 18" EV5s w/ Dunlop DZ101s • F-body calipers
EBC bluestuff/Hawk HP plus • SS lines • Brembo slotted discs • DHP tuned • Aeroforce • Hidden Hitch

^^^ SOLD ^^^ frown

'70 Ninety-Eight Holiday Coupe 455cid • 116k miles
^^^ SOLD ^^^ frown
Back to top Go down
http://www.cardomain.com/ride/657082/4
TonySmooth89
Aficionado
TonySmooth89


Name : Anthony
Age : 34
Location : Florida
Joined : 2007-11-14
Post Count : 2410
Merit : 16

High Boost - Could it be my exhaust? Empty
PostSubject: Re: High Boost - Could it be my exhaust?   High Boost - Could it be my exhaust? EmptyTue Aug 19, 2008 6:27 pm

I doubt its your exhaust unless you have a clogged cat. I have less exhaust mods with more intake mods and i don't have any KR issues( anymore). If i were you i'd set your timing back to stock and go from there. The fact that you don't have KR at WOT is also a bit curious as well.


Last edited by TonySmooth89 on Tue Aug 19, 2008 7:00 pm; edited 2 times in total
Back to top Go down
AA
Administrator
AA


Name : Aaron
Age : 46
Location : C-bus, Ohio
Joined : 2007-01-13
Post Count : 18438
Merit : 248

High Boost - Could it be my exhaust? Empty
PostSubject: Re: High Boost - Could it be my exhaust?   High Boost - Could it be my exhaust? EmptyTue Aug 19, 2008 6:43 pm

Yes, that is interesting. why no KR when the boost starts to build? Strange indeed. BTW, I think your extra boost PSI comes from the FWI. I picked up a lb when I installed mine.

_________________
'05 GTO 6.0L • 6-spd • 95k miles • 0-60: 4.8s • 16.9 avg MPG • Nelson Ledges Lap: 1:26

'95 Celica GT 2.2L • 5-spd • 165k miles • 0-60: yes

'98 SC Riviera • 281k miles • 298 HP/370 TQ • 0-60: 5.79s • ET: 13.97 @ 99.28 • 4087 lb • 20.1 avg MPG • Nelson Ledges Lap: 1:30
3.4" pulley • AL104 plugs • 180º t-stat • FWI w/K&N • 1.9:1 rockers • OR pushrods • LS6 valve springs • SLP headers • ZZP fuel rails
KYB GR2 struts • MaxAir shocks • Addco sway bars • UMI bushings • GM STB • Enkei 18" EV5s w/ Dunlop DZ101s • F-body calipers
EBC bluestuff/Hawk HP plus • SS lines • Brembo slotted discs • DHP tuned • Aeroforce • Hidden Hitch

^^^ SOLD ^^^ frown

'70 Ninety-Eight Holiday Coupe 455cid • 116k miles
^^^ SOLD ^^^ frown
Back to top Go down
http://www.cardomain.com/ride/657082/4
1998 Riv
Expert
1998 Riv


Name : Dave
Age : 62
Location : In The AZ Oven
Joined : 2007-01-17
Post Count : 4502
Merit : 44

High Boost - Could it be my exhaust? Empty
PostSubject: Re: High Boost - Could it be my exhaust?   High Boost - Could it be my exhaust? EmptyTue Aug 19, 2008 11:34 pm

Cat was new last spring, can't be clogged.

Maybe KR is zero at WOT because so much timing has already been pulled???

I was scanning in "gauge" mode also before logging, and on MILD acceleration from 65-70 mph, in OD, had a few degrees of KR show up.

I have some time off in Sept, but I need to devote most all of it to my 68 GS projects. But I will try to work in a day or 2 to play with the PT. Maybe I can figure out how to reset my timing tables to stock.
Back to top Go down
TonySmooth89
Aficionado
TonySmooth89


Name : Anthony
Age : 34
Location : Florida
Joined : 2007-11-14
Post Count : 2410
Merit : 16

High Boost - Could it be my exhaust? Empty
PostSubject: Re: High Boost - Could it be my exhaust?   High Boost - Could it be my exhaust? EmptyTue Aug 19, 2008 11:37 pm

1998 Riv wrote:
Cat was new last spring, can't be clogged.

Maybe KR is zero at WOT because so much timing has already been pulled???

I was scanning in "gauge" mode also before logging, and on MILD acceleration from 65-70 mph, in OD, had a few degrees of KR show up.

I have some time off in Sept, but I need to devote most all of it to my 68 GS projects. But I will try to work in a day or 2 to play with the PT. Maybe I can figure out how to reset my timing tables to stock.

Simple , just go to open calibration file and open your bin , go down to calibration data , click on spark , then left click on good fuel spark and slide over to import , and then the menu will extend to say stock data and hit that. Save and reflash.
Back to top Go down
1998 Riv
Expert
1998 Riv


Name : Dave
Age : 62
Location : In The AZ Oven
Joined : 2007-01-17
Post Count : 4502
Merit : 44

High Boost - Could it be my exhaust? Empty
PostSubject: Re: High Boost - Could it be my exhaust?   High Boost - Could it be my exhaust? EmptyTue Aug 19, 2008 11:54 pm

Hey Tony, thanks for the detailed info. I know it's not complicated once you know your way around this thing. Problem here, is I've done nothing more than getting the PT hooked up, set up, and scanned for a couple minutes, LAST year. That's ALL I've done in the nearly a year that I've owned my PT. I had high hopes of learning the ropes this spring/summer, but it just hasn't been possible. I have the tuning notebook, the table modifier, and the new scanning software all on my HD, where they've been untouched.
Back to top Go down
T Riley
Guru
T Riley


Name : Travis
Age : 33
Location : Minnesconsin
Joined : 2007-02-08
Post Count : 5127
Merit : 10

High Boost - Could it be my exhaust? Empty
PostSubject: Re: High Boost - Could it be my exhaust?   High Boost - Could it be my exhaust? EmptyWed Aug 20, 2008 1:31 am

dang dude..... that whack.... your KNOCK is in the middle of first than NO knock at the top of first THAN you see 5* on the downshift when you let off the gas, which is normal
Back to top Go down
http://www.rivperformance.com
Sponsored content





High Boost - Could it be my exhaust? Empty
PostSubject: Re: High Boost - Could it be my exhaust?   High Boost - Could it be my exhaust? Empty

Back to top Go down
 
High Boost - Could it be my exhaust?
Back to top 
Page 1 of 1
 Similar topics
-
» Quiet, high flow, legal exhaust?
» FAQ: Boost Bypass Valve/Boost Control Solenoid Questions (No Boost)
» KANDY any one????????
» Short exhaust / side exhaust
» Second boost?

Permissions in this forum:You cannot reply to topics in this forum
Riv Performance ::   Supercharged 3800 Tech :: Series II Scans, Tuning, PCM-
Jump to: