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Author
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Topic: MAJOR DETONATION!! HELP!!!!!
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91 5.0
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Member # 1527
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posted
 
 
Ive got a 91 mustang with a vortech 6 psi supercharger, flowmasters, and gears. When I put the blower on, my timing was at 10 degrees. Once the car got to about 4000 RPM, it started pinging like crazy. I retarded the timing all the way to 6 degrees and im still having a slight detonation problem. Any ideas? Could this be due to having a stock fuel pump?
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02 GT - Zinc Yellow
91 5.0 LX - Red
Posts: 1316 | From: Fairfield | Registered: Jul 2002
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Wildfire532FB
CAFords OG
Member # 1482
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posted
yeah you need a better fuel delivery, what kind of injectors do you have?
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68 Fastback
84 CJ7
94 HMMWV
95 GT
03 F350
17 Fusion Hybrid
Posts: 17578 | From: 530 | Registered: Jun 2002
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91 5.0
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Member # 1527
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posted
stock, 19lb/hr. Do I really need more than that with 6lbs of boost?
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02 GT - Zinc Yellow
91 5.0 LX - Red
Posts: 1316 | From: Fairfield | Registered: Jul 2002
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Stimson
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Member # 51
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posted
Are you running a BTM? What about an FMU? FMU's and stock fuel pumps don't mix.
Posts: 2373 | Registered: Jun 2000
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91 5.0
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Member # 1527
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posted
No BTM yet. I have the FMU that came with the blower. Will a 255lph pump solve the problem, or am I going to have to buy other things as well?
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02 GT - Zinc Yellow
91 5.0 LX - Red
Posts: 1316 | From: Fairfield | Registered: Jul 2002
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Jeff S
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Member # 371
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91 5.0,
You need to get a Walbro GSS-340 intank pump(255lph). That should solve your fuel problems, but if it doesn't then you should get a set of 30's and a MAF calibrated for them.
You may also be able to increase your base timing once you get your fuel problems solved.
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'90 Mustang LX: 8.53 @ 157.92 w/ 1.33 60' on DR's
'10 ZR1: FOR SALE
'14 E63 S: RENNtech ECU
'04 Gallardo: UGR TTG
Posts: 2121 | From: San Jose, CA | Registered: Aug 2001
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91 5.0
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Member # 1527
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posted
thanks. Ill pick up a 255 from performance plus on my way home from work. Ill let you know how it works out.
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02 GT - Zinc Yellow
91 5.0 LX - Red
Posts: 1316 | From: Fairfield | Registered: Jul 2002
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99gt-UJSTLST
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Member # 584
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posted
quote:
Originally posted by 91 5.0:
thanks. Ill pick up a 255 from performance plus on my way home from work. Ill let you know how it works out.
I would get a 255 intankd and a adjustable fuel presure regulator and if its still has the prob get some 30# injectors with the MAF
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SOUTH BAY STANGS
MINOR BOLT ON'S
www.southbaystangs.com
Posts: 2558 | From: SAN JOSE CA | Registered: Nov 2001
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90gtverrt
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Member # 1437
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posted
I had the same problem, I upgraded to 255 pump, 30# jeets and MAF, even at 6 base timing i still had pinging....even upping the fuel pressure didnt help.....there were no vacuum leaks, no codes I couldnt figure it out and it cost em a motor ![[Frown]](frown.gif) Tmie for a dyno tune with the new motor
Mike
Posts: 1199 | From: Livermore, CA | Registered: Jun 2002
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91 5.0
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Member # 1527
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posted
quote:
Originally posted by fiveohmike:
I had the same problem, I upgraded to 255 pump, 30# jeets and MAF, even at 6 base timing i still had pinging....even upping the fuel pressure didnt help.....there were no vacuum leaks, no codes I couldnt figure it out and it cost em a motor Tmie for a dyno tune with the new motor
Mike
I dont understand??? So youre saying that there is no cure for this and my motor is going to blow????
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02 GT - Zinc Yellow
91 5.0 LX - Red
Posts: 1316 | From: Fairfield | Registered: Jul 2002
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BlackNGold
CaliforniaFords.com
Moderator
Member # 655
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posted
I suggest ditching the 19#'s and getting some 30# injectors and a bigger fuel pump(doesnt the Vortech kit come with a 255LPH?,T-Rex? I guess only the S-trim 8lbs kit does?).. When you order the MAF sensor to match the injectors, its a good idea to make sure the people you order the MAF from know you car is supercharged.
[ January 03, 2003, 11:42 PM: Message edited by: Black94 5.0 ]
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-SLOWER TRAFFIC KEEP RIGHT-
Posts: 5132 | From: Bay Area, CA | Registered: Dec 2001
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Mach103
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Member # 746
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posted
hey 91 5.0 its mario from brentwood with the maroon mustang with the s trim or had the s trim. hey good luck on that shit, its going to be really hard to get that shit right whatever u do, do not drive the car how it is right now it will blow up trust me i came very close to doing that shit. u doin it all wrong u need to have everything for that supercharger first of u have a fmu that calibrated for 24 i know becauce its my disk, and u have 19lb injectors and stock fuel pump not good either. just do your self a favor and get eveythign u need first, then drive the thing.my 2 cents. mario. PS ditch the blower go n/a just giving your self problems with the blower.
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2007 Ford Mustang GT
1995 Mustang GT Sapphire Blue(SOLD)
2003 Mustang Mach 1 (SOLD)
2006 Chevy Trailblazer SS
Posts: 898 | From: Yuba City | Registered: Jan 2002
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91 5.0
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Member # 1527
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posted
Thanks for the advice. Why do you say go N/A?
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02 GT - Zinc Yellow
91 5.0 LX - Red
Posts: 1316 | From: Fairfield | Registered: Jul 2002
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Jeff S
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Member # 371
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posted
91 5.0,
There is a cure and your car will not blow as long as everything is setup properly.
What spark plugs are you running and what are they gapped at? You really should get a chip or a BTM to control the spark advance. I'd also recomend changing your fuel filter if it has not been changed in the past 15k miles
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'90 Mustang LX: 8.53 @ 157.92 w/ 1.33 60' on DR's
'10 ZR1: FOR SALE
'14 E63 S: RENNtech ECU
'04 Gallardo: UGR TTG
Posts: 2121 | From: San Jose, CA | Registered: Aug 2001
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91 5.0
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Member # 1527
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posted
ok, My fuel filter hasnt been changed since I got it. Im using autolite 24's with a .032 gap. What should I be using?
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02 GT - Zinc Yellow
91 5.0 LX - Red
Posts: 1316 | From: Fairfield | Registered: Jul 2002
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90gtverrt
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Member # 1437
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posted
91 5.0
There is a cure to your problem, but in my case something else was causeing the pinging. This is what byron told me. He said there should have been no reason for me to ping at 6degrees with 30# jets and an FMU calibrated for them. My case was maybe a burnt valve on my number 4 cylinder....that was the cylinder that dropped a rod but defiently get the fuel system squared away.
Mike
Posts: 1199 | From: Livermore, CA | Registered: Jun 2002
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Gear Head
JARED
Member # 779
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posted
Dustin did you buy back in blacks blower? Thats cool shit man get it tuned and maybe youll hit high 12's.
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Support our troops!
Posts: 5685 | From: EASTBAY | Registered: Jan 2002
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91 5.0
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Member # 1527
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posted
yeah, I got it. I should be able to hit 12's when I get the fuel situation fixed and get it tuned.
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02 GT - Zinc Yellow
91 5.0 LX - Red
Posts: 1316 | From: Fairfield | Registered: Jul 2002
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hidnn.o.s.
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Member # 1219
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posted
With 6 psi you should be able to get buy nicely with STOCK injectors. Just put in a 255 intank, re check the gap on the plugs, change your fuel filter, and you should be able to get 8 degrees out of it properly tuned up.
I am assuming that you do not have heads, cam, etc.
I have had 8 pounds of boost on 5 different stangs that all had STOCK injectors with 255 intanks.
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R.I.P. Willie G. You are missed on this forum
Posts: 15950 | Registered: Apr 2002
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91 5.0
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Member # 1527
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posted
with 6 psi I can only run 8 degrees of timing? I was hopin for a bit more than that. The rest of my car is basically stock. So stock injectors and 255 will be sufficient? Ive got a 255 on the way. How about an adjustable fuel press. regulator?
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02 GT - Zinc Yellow
91 5.0 LX - Red
Posts: 1316 | From: Fairfield | Registered: Jul 2002
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Jeff S
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Member # 371
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posted
91 5.0,
If you can get a BTM you will make alot more power "under the curve" if you raise your initial timing to 12-14 and set the BTM accordingly. I'd thik you'd be able to run 25-26 degrees total, but the only way to find out it fix your problems and then go test it.
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'90 Mustang LX: 8.53 @ 157.92 w/ 1.33 60' on DR's
'10 ZR1: FOR SALE
'14 E63 S: RENNtech ECU
'04 Gallardo: UGR TTG
Posts: 2121 | From: San Jose, CA | Registered: Aug 2001
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hidnn.o.s.
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Member # 1219
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posted
you will have to see how your setup responds to advanced timing. You won't notice much of a difference going from 8-12 degrees of timing.
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R.I.P. Willie G. You are missed on this forum
Posts: 15950 | Registered: Apr 2002
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