What the hell is going on? - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


Insert BS here A place to discuss anything you want

Reply
 
 
 
LinkBack Thread Tools Search this Thread
Old 03-09-2009, 12:08 AM   #1
Elite Member
Thread Starter
iTrader: (12)
 
Join Date: Jan 2007
Location: Hermosa Beach, CA
Posts: 2,575
Total Cats: 11
Default What the hell is going on?

So my buddy has a vortec supercharged mustang that was being worked on at a performance shop. they tuned it, and some other **** I dont know. To tell you the truth I dident like the way they did things but whatever. So we got it back, and it dynoed a healthy 440hp. Problem is it idled like ****, and the supercharger surged (bov wasent working?).

So I looked around. Seems they moved the recirculating BOV to before the MAF sensor and let it dump to atmosphere. Now it leaks at idle, seems the supercharger is pushing ALOT of air out of the BOV when idleing. Like hair dryer on high powerful. I dident like this, so we relocated it back to after the MAF and recirculated it. Now it ran like total ****, this was not working.

So then I dident recirculate it, and tired to tighten the spring up on the BOV. Still leaked... but ran a little better.

So I tried resetting the ECU and recirculateing the BOV. Now it ran REALLY bad, scared us actually.

So I gave up and put everything back like it was. Funny thing is now the surge is gone, and it runs great. WTF?

I figured maybe it ran like **** when recirculated because they tuned it with the BOV leaking at idle... but I thought that would **** with the MAF sensor? I dunno what to do, I guess if its running fine now just leave it.

Its a 99 stang with a sean highland 6.1L engine, cams, vortec v1, 10 lbs boost, SCT I think flash tuned, some odd dialbosport maf.ia...

I mean I know the cams can **** with idle, the motor pulls around 10 to 9 inhg vacuum.


This is why I do my own work....
cardriverx is offline   Reply With Quote
Old 03-09-2009, 12:14 AM   #2
Murderator
iTrader: (76)
 
18psi's Avatar
 
Join Date: Apr 2008
Posts: 36,196
Total Cats: 2,583
Default

so is there a question somewhere in there or are these just observations?
18psi is offline   Reply With Quote
Old 03-09-2009, 12:15 AM   #3
Elite Member
iTrader: (1)
 
NA6C-Guy's Avatar
 
Join Date: Feb 2008
Location: Birmingham Alabama
Posts: 8,038
Total Cats: 43
Default

I dont know whats up, but that sounds like ****.
NA6C-Guy is offline   Reply With Quote
Old 03-09-2009, 12:27 AM   #4
Elite Member
Thread Starter
iTrader: (12)
 
Join Date: Jan 2007
Location: Hermosa Beach, CA
Posts: 2,575
Total Cats: 11
Default

lol sorry guys, I was just wondering if you had any ideas as to why the car now runs good, and why recirculating the bov like it should be made it run so shitty.
cardriverx is offline   Reply With Quote
Old 03-09-2009, 12:38 AM   #5
Senior Member
iTrader: (2)
 
Join Date: Oct 2007
Location: Northeastern CT
Posts: 547
Total Cats: 2
Default

if it was tuned with that huge leak then recirculating it will make it run lean at idle.

i'd just recirculate the bypass valve to after the filter but before the maf. sure its not quite right, but it should run fine that way.
therieldeal is offline   Reply With Quote
Old 03-09-2009, 12:39 AM   #6
Murderator
iTrader: (76)
 
18psi's Avatar
 
Join Date: Apr 2008
Posts: 36,196
Total Cats: 2,583
Default

I have no experience with mustangs, but:
if the car was tuned for it not to be recirc'd it might have been running lean from all the extra air you added to the mix when recirculating the bov. just my .02


*edit:
Quote:
Originally Posted by therieldeal View Post
if it was tuned with that huge leak then recirculating it will make it run lean at idle.

i'd just recirculate the bypass valve to after the filter but before the maf. sure its not quite right, but it should run fine that way.
You beat me by a fraction of a minute
18psi is offline   Reply With Quote
Old 03-09-2009, 01:08 AM   #7
:(
iTrader: (7)
 
Join Date: Jul 2006
Location: nowhere
Posts: 8,281
Total Cats: 2
Default

um his real problem is he let someone tune it with a flash tuner get something u can realy ****** adjust. And since he obviusly put alot fo $$ into the car the people who didnt finish the job ie give him a satisfactory product should fix it.
magnamx-5 is offline   Reply With Quote
Old 03-09-2009, 01:41 AM   #8
Elite Member
Thread Starter
iTrader: (12)
 
Join Date: Jan 2007
Location: Hermosa Beach, CA
Posts: 2,575
Total Cats: 11
Default

Quote:
Originally Posted by magnamx-5 View Post
um his real problem is he let someone tune it with a flash tuner get something u can realy ****** adjust. And since he obviusly put alot fo $$ into the car the people who didnt finish the job ie give him a satisfactory product should fix it.
THats what I keep tellin him, we are going to go over there this week. I feel like they are going to be a huge pain in the ***.

And I assumed it would run lean, dident think it would change as much as it did tho. The car couldent even move. ****** shops, they said its supposed to leak.
cardriverx is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
MS PNP requires reading and following directions??? satisfied MEGAsquirt 141 10-06-2015 11:44 AM
First to get it out of the way main Meet and Greet 2 09-05-2015 02:03 PM
.....wow..... BrillntBlk92 Prefabbed Turbo Kits 7 06-01-2007 04:42 PM
Decisions - A Politician's Story m2cupcar Insert BS here 2 11-03-2006 11:18 PM
I've hit a snag... what the hell!!! samnavy DIY Turbo Discussion 22 10-27-2006 11:12 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 03:30 AM.