Magnuson Problem solved
Thread Starter
Advanced
Joined: Jul 2002
Posts: 89
Likes: 0
From: Saratoga CA
Magnuson Problem solved
I had just about given up on the Magnason S/C on my car. The car had this noise that sounded like knocking while under hard acceleration and even though the tuner's scanner said the car wasn't knocking, I swore it was.
Well it is amazing what an add of 4 gals of 100 Octane fuel can do. No mor knock. Anyone else in California having problems with 91 octane fuel ?? :confused:
Try some 100 octane stuff, it helps. :hurray: :hurray:
Well it is amazing what an add of 4 gals of 100 Octane fuel can do. No mor knock. Anyone else in California having problems with 91 octane fuel ?? :confused:
Try some 100 octane stuff, it helps. :hurray: :hurray:
Le Mans Master
Joined: Aug 2001
Posts: 6,725
Likes: 5
From: Colesville MD
Re: Magnuson Problem solved (Dunat50)
Who tuned your car? If the tune was done using the 91 octane gas you use, you should not have this problem It's unfortunate that you may have to do a more conservative tune for California, but it seems to be the reality. Glad to hear the problem is solved.
Greg
:steering:
Greg
:steering:
Thread Starter
Advanced
Joined: Jul 2002
Posts: 89
Likes: 0
From: Saratoga CA
Re: Magnuson Problem solved (OliverM5)
Not sure. Given the trouble with the hood, tuning, frying a piston and that cost I wish I had looked into a head/cam pkg. but I never gave it a thought at the time. :banghead: The idea of supercharging just struck a cord and I never looked at any other ideas. :confused:
The S/C is a kick, I have to admit, I'm not disappointed, just lighter in the wallet :crazy:
[Modified by Dunat50, 7:34 PM 3/24/2003]
The S/C is a kick, I have to admit, I'm not disappointed, just lighter in the wallet :crazy:
[Modified by Dunat50, 7:34 PM 3/24/2003]
Team Owner
Joined: Jun 2001
Posts: 55,394
Likes: 1
Re: Magnuson Problem solved (OliverM5)
Sounds like a lot of trouble for 380 rwhp.....would you do it again or just go with heads/cam?
Thread Starter
Advanced
Joined: Jul 2002
Posts: 89
Likes: 0
From: Saratoga CA
Re: Magnuson Problem solved (MarkFLC5)
My car ran lean from the moment I installed the Superchips program that came with the S/C, and MMS got rid of most of it, but it still was there under certain accelerations. Only the higher octane has eliminated it completely.
The lean condition is what fried a piston and cost a bundle. :mad :mad
The lean condition is what fried a piston and cost a bundle. :mad :mad
Instructor
Joined: Sep 2002
Posts: 101
Likes: 0
From: st. louis mo
Re: Magnuson Problem solved (Dunat50)
ive got the same problems, and i just got my car back from a dyno tune done at ed wrights shop! if thats not a spark knock ill eat my hat , im out of options though, its gonna go until it blows!
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
Thread Starter
Advanced
Joined: Jul 2002
Posts: 89
Likes: 0
From: Saratoga CA
Re: Magnuson Problem solved (jfk c5 ls1)
The new tuner I'm using in the Bay area hooked up his scanner and computer and we went for a ride. The scanner said the car was not knocking, but the noise was a knock. We looked at the cats, the tensioner and anything else we could think of that might make that noise. :confused: :confused: . But could not find anything so I suggested higher octane fuel. There's a place that sells 100 octane, so in it went and away went the knockin :hurray: :hurray:
Best of luck
Best of luck
Instructor
Joined: Sep 2002
Posts: 101
Likes: 0
From: st. louis mo
Re: Magnuson Problem solved (Dunat50)
if your using higher octane fuel and the noise goes away then it has to be a spark knock. ive used an additive and it made no change in mine so ive been told its not a spark knock, but i have a nosie that sound just like one !
Thread Starter
Advanced
Joined: Jul 2002
Posts: 89
Likes: 0
From: Saratoga CA
Re: Magnuson Problem solved (jfk c5 ls1)
I used an additive ever since I got the S/C and it did not help, it is only after used 4 gals of 100 to the remainder of the tank in 91 that it went away.
Instructor
Joined: Sep 2002
Posts: 101
Likes: 0
From: st. louis mo
Re: Magnuson Problem solved (Dunat50)
so how often do you fill up with 100? or did you just use it once? it seems to me that it would need it all the time, if it solved the knock. im still looking for 100 or better that i can pump unleaded, we have it leaded but not un.
Team Owner
Joined: Mar 1999
Posts: 28,753
Likes: 9
From: San Jose/Bear Valley CA
CA Events Coordinator
Re: Magnuson Problem solved (Dunat50)
Too bad you are not able to find any other solution for that knock problem. :( buying that fuel is not going to be cheap or easy for each fill up. I have a portable 30 gallon fuel tank that I take to that same station that you go to so I can store 100 octane and put it in the car in blend or straight up when I need it. Here is a link to the tank. http://www.northerntool.com/webapp/w...=533&langId=-1
vetterdstr :cheers:
vetterdstr :cheers:
Melting Slicks
Joined: Mar 2002
Posts: 2,931
Likes: 2
From: Tx
Re: Magnuson Problem solved (vetterdstr)
Has anyone tried water/alky or propane injection on a magnuson. It might not be ideal with a twin screw, but it is something that can be used as a substitute for high octane gas and an intercooler on many other FI applications. See this link for more details on how it works. http://www.carrollsupercharging.com/GI.html
One other thing. You guys should really try a decarb procedure to eliminate some your knock. It's a very simple procedure and can be done without breaking a sweat. The PVC design on your LS1 has left you with a nice oil supply in your intake. Search the tech section for details on how the decarb can be done.
One other thing. You guys should really try a decarb procedure to eliminate some your knock. It's a very simple procedure and can be done without breaking a sweat. The PVC design on your LS1 has left you with a nice oil supply in your intake. Search the tech section for details on how the decarb can be done.
Thread Starter
Advanced
Joined: Jul 2002
Posts: 89
Likes: 0
From: Saratoga CA
Re: Magnuson Problem solved (jfk c5 ls1)
I am running on the first tank, still. At this point I will probably add the 100 octane with every fillup. It adds $8 to a fill each fillup, it is no different then the cost of an additive. :skep:
I do not know whether the stuff I.m pumping is unleaded or not. At this point it solved my problem :thumbs:
I do not know whether the stuff I.m pumping is unleaded or not. At this point it solved my problem :thumbs:
Instructor
Joined: Sep 2002
Posts: 101
Likes: 0
From: st. louis mo
Re: Magnuson Problem solved (Dunat50)
i found 1oo race gas today but you can only buy it on race/practice days. also it can only be pumped into a container, so ill be trying this tomorrow. how about rotor noise? i checked with a tech 2 today and no matter what this noise is its pulling timing so its not good. magnuson said it will take appoximately 1000-2000 miles before it goes away, anyone heard that before?
Thread Starter
Advanced
Joined: Jul 2002
Posts: 89
Likes: 0
From: Saratoga CA
Re: Magnuson Problem solved (jfk c5 ls1)
What rotor noise are you referring to?? :confused:
After switching to the higher octane my engine stopped the knocking noise immediately. I am driving at Thunderhill ractrack this Friday I will let you know how it goes.
After switching to the higher octane my engine stopped the knocking noise immediately. I am driving at Thunderhill ractrack this Friday I will let you know how it goes.
Team Owner
Joined: Mar 1999
Posts: 28,753
Likes: 9
From: San Jose/Bear Valley CA
CA Events Coordinator
Re: Magnuson Problem solved (Lambchop)
I've been running Shell 93 with no problem.
knocks on wood
knocks on wood
vetterdstr :cheers: