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| ZR-1 General and Technical Discussion For discussion of the 1990 - 1995 ZR-1. |
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08-23-06, 04:59 PM
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#1 (permalink)
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Member
Join Date: Dec 2003
Location: Stockholm, Sweden
Posts: 23
My Corvette(s):
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ZR-1 92 hp?
Hi.
I'm just about to buy a -92 ZR-1. The owner claims the LT5 is 405 hp. I'm pretty sure that engine version is from -93. What's correct?
When driving it and shifting down from 3:d to 2:nd I heard a distinctive (but not very loud) exhaust bang from the end of the pipes. This happend twice. Is it normal or an indication of some serious engine trouble? Any guesses?
TIA
Peter
Last edited by ajax6; 08-23-06 at 05:20 PM.
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08-23-06, 06:47 PM
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#2 (permalink)
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Supporting Member
Join Date: May 2002
Location: 5th Wheeling & Lebanon, MO
Posts: 6,380
My Corvette(s):
Millennium Yellow Y2K/MN6/Z51/LS6 Roadster
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1990-1992 - 375 hp @ 6,000 rpm / SAE Net Power
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08-23-06, 07:03 PM
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#3 (permalink)
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Member
Join Date: Dec 2003
Location: Stockholm, Sweden
Posts: 23
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Just as I thought. Thank's.
And how 'bout the backfiring? Is it normal?
Peter
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08-23-06, 07:19 PM
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#4 (permalink)
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Site Administrator
Join Date: Sep 2000
Location: CAC
Posts: 18,404
My Corvette(s):
The mythical 1990 ZR-1
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Quote:
Originally Posted by ajax6
Just as I thought. Thank's.
And how 'bout the backfiring? Is it normal?
Peter
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Backfiring isn't normal.
But before I get to that. The 1990 - 1990 LT5 engines came with 375hp. The 1993 - 1995 LT5 engines came with 405 hp. Unless he had the engine replaced with a second generation LT5, the engine in that car should be 375.
As far as backfiring, the engine should not be backfiring. Sometimes, the engine can chug, and shake a little upon start up if it hasn't been started in a while, or if the fuel injectors are leaking into the cylinders. Other than that, the engine should not backfire.
What does the engine have on it for mileage? How has it been driven?
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Corvette Action Center
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08-23-06, 07:19 PM
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#5 (permalink)
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Member
Join Date: Dec 2003
Location: Stockholm, Sweden
Posts: 23
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Ok. Would you skip the deal, then?
The engine has 47 K.
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08-23-06, 10:09 PM
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#6 (permalink)
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Site Administrator
Join Date: Sep 2000
Location: CAC
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My Corvette(s):
The mythical 1990 ZR-1
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Quote:
Originally Posted by ajax6
Ok. Would you skip the deal, then?
The engine has 47 K.
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It's hard to say. I'd have to see the car and find out why the owner is claiming that it has 405hp when it should only have 375.
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Rob Loszewski, Site Administrator
Corvette Action Center
NCRS Member #27792
"Let your plans be dark and impenetrable as night, and when you move, fall like a thunderbolt." - Sun Tzu
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08-23-06, 10:44 PM
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#7 (permalink)
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Member
Join Date: Jan 2004
Location: East Peoria, Ill.
Posts: 34
My Corvette(s):
1990 Vert, 1990 ZR1, 2002 Z06
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Your backfire could be the exhaust.
I'm running headers, no cats, and Borla mufflers. I, often, get a slight
backfire from the exhaust.
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08-24-06, 03:06 AM
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#8 (permalink)
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Member
Join Date: Dec 2003
Location: Stockholm, Sweden
Posts: 23
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Yeah, that sounds somewhat like my problem. Not really a serious backfire - rather a 'pop' in the pipes.
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08-24-06, 06:25 AM
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#9 (permalink)
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Site Administrator
Join Date: Sep 2000
Location: CAC
Posts: 18,404
My Corvette(s):
The mythical 1990 ZR-1
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Quote:
Originally Posted by ajax6
Yeah, that sounds somewhat like my problem. Not really a serious backfire - rather a 'pop' in the pipes.
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Does the car have the stock exhaust or an aftermarket exhaust?
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Rob Loszewski, Site Administrator
Corvette Action Center
NCRS Member #27792
"Let your plans be dark and impenetrable as night, and when you move, fall like a thunderbolt." - Sun Tzu
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08-24-06, 06:42 AM
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#10 (permalink)
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Join Date: Dec 2003
Location: Stockholm, Sweden
Posts: 23
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Stock as far as I know. Square exhaust pipes
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08-24-06, 08:47 AM
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#11 (permalink)
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Member
Join Date: Feb 2004
Location: GARDEN CITY MO.
Posts: 85
My Corvette(s):
81 COUPE 4SP/91 ZR1/91 CALLAWAY/91 ZR1 GRAND SPORT
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BACKFIRING WHEN DOWN SHIFTING IS NORMAL.SEEMS WORSE WITH HEADERS.GET A CHIP FROM MARC HE CAN TAKE THAT OUT.
STEVE
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08-24-06, 02:29 PM
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#12 (permalink)
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Member
Join Date: Dec 2003
Location: Stockholm, Sweden
Posts: 23
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Talk 'bout backfiring!!!
Peter
Last edited by ajax6; 08-28-06 at 04:16 AM.
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08-28-06, 05:40 PM
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#13 (permalink)
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Member
Join Date: Dec 2002
Location: j-ville nc
Posts: 361
My Corvette(s):
90 ZR-1 #854 and 1968 427/400 coupe
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My 90 with heders and flowmasters has some nice backfires when I downshift and they are lound nothing pansylike a little pop.
I wouldnt wory about hearing a little backfire it happens sometimes.
Take ti out do a few full RPM runs bang it through the gears and get the carbon out of the engine
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Johnny P
ZR1's RULE!
90 ZR1's #354 # 854 #1908
LT5 Registry #694
NCM Lifetime Member # 913
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08-30-06, 04:52 PM
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#14 (permalink)
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Member
Join Date: Dec 2003
Location: Stockholm, Sweden
Posts: 23
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Quote:
Originally Posted by phrogs
My 90 with heders and flowmasters has some nice backfires when I downshift and they are lound nothing pansylike a little pop.
I wouldnt wory about hearing a little backfire it happens sometimes.
Take ti out do a few full RPM runs bang it through the gears and get the carbon out of the engine
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Ok, thank's. That sounds good. This is the beauty I'm considering:
[
Last edited by ajax6; 08-30-06 at 05:23 PM.
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