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Author
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Topic: question for supercharged 4.6 guys
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Darth Vetter
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Member # 2458
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posted
 
 
I have a Saleen with a bulit blower motor, vortech w/ intercooler. about 13lbs of boost.
anyway my problem is as follows. latley when im running my car hard, when i shift my car bogs out...its almost as if the motor cuts out for 1/2 second and then picks up the shift and goes. its real strange. only under race condition though. power builds just fine until each gear shift. 1st throuh 4th id say im losing about 2-3 seconds off a 1/4 mile time. im thinking and hoping its either a bad chip/tuning issue. this ever happen to anyone?
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01 SHM Saleen S281 (SOLD)
65 Fastback
84 Vette
98 Lincoln
WWW.BLACKTRAX.NET
Posts: 2021 | From: san jose, ca | Registered: Feb 2003
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Procharged98
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Member # 2152
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posted
Maybe your fuel pump is cutting out or your having belt slip at high RPM's. Before I got my RR pulley you could feel the car lay over when the belt slipped. Look for belt dust around the head unit or down by the harmonic balancer.
Posts: 24 | From: Sacramento, CA | Registered: Dec 2002
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Darth Vetter
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Member # 2458
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posted
yai remember at my last dyno somthing being mentioned about some possible belt slipage at high rpm's. id rather it be that or a tuning issue instead of a fuel pump. either way it makes my car run like dookie. i had a virtually stock 03 cobra pulling on me over the weekend cuz of it. first time for everything i guess.
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01 SHM Saleen S281 (SOLD)
65 Fastback
84 Vette
98 Lincoln
WWW.BLACKTRAX.NET
Posts: 2021 | From: san jose, ca | Registered: Feb 2003
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slidewayz94
CAFords OG
Member # 3101
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posted
my buddy had a huge problem with belt slippage on his 98 GT and under full boost it would slip and cut the oil lines to the blower several times.
Posts: 4251 | From: Sac | Registered: Jul 2003
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THE King Cobra
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Member # 2011
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posted
You sure the Cobra was stock? ![[Wink]](wink.gif) ...ya im thinking its something mechanical instead of a tuning issue.
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RPM Racing Team
-96 Cobra. HCI MOTORSPORTS block
-More cops in the family = more write-offs
508 RWHP @10.0lbs @6100 RPM..wait till I hit 8K RPM's
Posts: 315 | From: Bay Area, CA | Registered: Oct 2002
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Darth Vetter
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Member # 2458
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posted
lol@ "somthing mechanical" thanks for letting me know it could be one of 2903890849834 things lol
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01 SHM Saleen S281 (SOLD)
65 Fastback
84 Vette
98 Lincoln
WWW.BLACKTRAX.NET
Posts: 2021 | From: san jose, ca | Registered: Feb 2003
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THE King Cobra
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Member # 2011
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posted
quote:
Originally posted by DVblownS281:
lol@ "somthing mechanical" thanks for letting me know it could be one of 2903890849834 things lol
hehe...LOL...its probably gonna be number 5268390-5. LOL ![[Big Grin]](biggrin.gif)
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RPM Racing Team
-96 Cobra. HCI MOTORSPORTS block
-More cops in the family = more write-offs
508 RWHP @10.0lbs @6100 RPM..wait till I hit 8K RPM's
Posts: 315 | From: Bay Area, CA | Registered: Oct 2002
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Darth Vetter
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Member # 2458
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posted
are we the only blown 4.6 guys on here?
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01 SHM Saleen S281 (SOLD)
65 Fastback
84 Vette
98 Lincoln
WWW.BLACKTRAX.NET
Posts: 2021 | From: san jose, ca | Registered: Feb 2003
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JohnB
Tech Moderator
Member # 969
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posted
Belt slippage on the 4.6's is a direct result of a bad tensioner. Sounds like a fuel problem. If you've got a 190lph pump or less in it, there's your problem.
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1965 Shelby Cobra
1993 Cobra
2012 F150 Raptor
2020 GT500
Posts: 6523 | From: Orlando FL/Redding CA | Registered: Mar 2002
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Darth Vetter
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Member # 2458
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posted
i have the 03+ cobra fuel system
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01 SHM Saleen S281 (SOLD)
65 Fastback
84 Vette
98 Lincoln
WWW.BLACKTRAX.NET
Posts: 2021 | From: san jose, ca | Registered: Feb 2003
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04Z06
AX/OT Moderator
Member # 2309
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posted
Check your belt, tensioner, and fuel filter.. I have a filter get clogged some time back and it only effect the car under full throttle..
Eric
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2004 Z06
2003 DSG Mach 1 Wife took it in the Divorce
2001 Cobra (scrap yard, I hope)
2003 Blk Cobra (traded)
Posts: 377 | From: Ca. | Registered: Jan 2003
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-NORCALCOBRA-
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Member # 2383
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posted
russ i think it can definatly be belt slip on the dyno you put some load on the car but no as much as when you you drive it on the street when it was slipping before it was at high rpms on the dyno with a blown head gasket i think you are making more hp with that problem solved now i think you should look into a 8 rib setup now i think it would be a good investment...on the other hand you could have some kind of fuel or spark cut out it would be very hard to be exact without driving it or throwing a scanner on it ....
sorry i cant solve your problem but good luck
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H.C.I 285 ci. ported 2003 heads heads, Sullivan Intake, stage 3 cams..T-76 single turbo to come...
R.M.I cylinder head fabrication
408 986 8626
Posts: 516 | From: SAN JOSE | Registered: Jan 2003
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Darth Vetter
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Member # 2458
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posted
yea, ill be taking it in soon.
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01 SHM Saleen S281 (SOLD)
65 Fastback
84 Vette
98 Lincoln
WWW.BLACKTRAX.NET
Posts: 2021 | From: san jose, ca | Registered: Feb 2003
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