2nd VORTECH dyno
Thread Starter
Melting Slicks
Joined: Aug 2002
Posts: 2,103
Likes: 0
From: Tacoma WA your Junk Yard Dogg
2nd VORTECH dyno
well i installed the racetronix fuel pump praying it would help the large dip on the dyno....but it didnt help...my fuel pressure stayed rock soild this time but i still have problems on the top end......the dyno operator said i am still running too lean and he thinks the dip may be that my MAF tables need to be adjusted a lot because of the supercharger ........i thought that 14 on A/F scale meant i was running rich...maybe i am thinking backwards...he said i want to be around 12 on the scale....any comments?????????? 
[Modified by corvette184, 1:10 AM 1/19/2004]
[Modified by corvette184, 1:10 AM 1/19/2004]
Pro
Joined: Jan 2002
Posts: 741
Likes: 9
From: Rancho Cordova CA
Re: 2nd VORTECH dyno (corvette184)
Have you changed the pulley? Are you using the Vortech program? How long since a filter change? Some thoughts.
At the rate your going you must have some pretty heavy detonation. Start saving for new motor or don't get on it until you figure it out. Take it from someone who has had to get a engine rebuilt a couple of months after the vortech and a smaller pulley. :cheers:
At the rate your going you must have some pretty heavy detonation. Start saving for new motor or don't get on it until you figure it out. Take it from someone who has had to get a engine rebuilt a couple of months after the vortech and a smaller pulley. :cheers:
Thread Starter
Melting Slicks
Joined: Aug 2002
Posts: 2,103
Likes: 0
From: Tacoma WA your Junk Yard Dogg
Re: 2nd VORTECH dyno (Bone_Stock)
i emailed my tuner Johan@diablosport and hopefully i can get her adjusted right......i havent driven the car since the last dyno session :(
Pro
Joined: Sep 2003
Posts: 564
Likes: 0
From: Cary NC
Re: 2nd VORTECH dyno (corvette184)
well i installed the racetronix fuel pump praying it would help the large dip on the dyno....but it didnt help...my fuel pressure stayed rock soild this time but i still have problems on the top end......the dyno operator said i am still running too lean and he thinks the dip may be that my MAF tables need to be adjusted a lot because of the supercharger ........i thought that 14 on A/F scale meant i was running rich...maybe i am thinking backwards...he said i want to be around 12 on the scale....any comments??????????
[Modified by corvette184, 1:10 AM 1/19/2004]
[Modified by corvette184, 1:10 AM 1/19/2004]
Are you logging while on the Dyno? It could be knock retard backing the timing down when it senses detonation arounf 5500RPM when you see your power drop. Really need to log to see.
:cheers:
[Modified by 2k1vert, 8:49 PM 1/18/2004]
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
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
Melting Slicks
Joined: Apr 2002
Posts: 2,683
Likes: 0
Re: 2nd VORTECH dyno (corvette184)
Man, that's pretty nasty looking..... STILL!!!! I would look at either the tune from Johan or maybe it's electrical related?? Though you did install the Racetronix soooooo I guess I'm clueless. :crazy:
Did you datalog while on the dyno? Could you possibly log the car on the street with a notebook and some software for that purpose, I think one is named Ease? Perhaps others will chime in here.
Did you datalog while on the dyno? Could you possibly log the car on the street with a notebook and some software for that purpose, I think one is named Ease? Perhaps others will chime in here.
Pro
Joined: Sep 2003
Posts: 564
Likes: 0
From: Cary NC
Re: 2nd VORTECH dyno (dads01dream)
EFILive V8 Pro rocks! You can see just whats happening. Total requirement for seeing how everything is working and where your problems are. Of course there is a learning curve, not so much the tool, but rather the understanding of how the SFI works and all the sensors and what it all means. There is where a good tuner can really help. Dynojet with a wideband O2, A decent logging program and LS1Edit. Can make a kitten purr.
:steering:
:steering:
Melting Slicks
Joined: Jun 2002
Posts: 3,060
Likes: 3
From: Dublin CA
Re: 2nd VORTECH dyno (corvette184)
You might want to check for a high-rpm miss. An old dyno of mine shows what worn stock plugs and wires do under boost.
Note that it was also around 6000-6200rpm.
[Modified by blu00rdstr, 7:35 PM 1/19/2004]
Note that it was also around 6000-6200rpm.
[Modified by blu00rdstr, 7:35 PM 1/19/2004]
Melting Slicks
Joined: Mar 2002
Posts: 2,931
Likes: 2
From: Tx
Re: 2nd VORTECH dyno (2k1vert)
You want a supercharged engine to be running around 12 AFR at WOT. 14 is way to lean. I would probably start by increasing your PE vs RPM table to dump more fuel from 1600RPM upto 7200RPM and then log WOT again while on the Dyno and look to see if you are getting any KR. I would also try advancing the high octane table as well to increase the timing if required to shoot for around 26-28 degrees at WOT as LS1's seem to produce the most HP. Again, watching for KR. Obvisously, you probably want to raise and lower the timing a degree or two each way when dialing it in to try and achive max power. Good Luck. The joy of tuning :?)
Are you logging while on the Dyno? It could be knock retard backing the timing down when it senses detonation arounf 5500RPM when you see your power drop. Really need to log to see.
:cheers:
Are you logging while on the Dyno? It could be knock retard backing the timing down when it senses detonation arounf 5500RPM when you see your power drop. Really need to log to see.
:cheers:
Also, the MAF will max out on a FI car running a decent amount of boost. This is where you have to start adding fuel with the PE tables. You don't do it across the board. Your PE graph should be pretty flat until the maf maxes and then it should have an exponential rise (since the base calc is no longer adding fuel).
You can see exacly when your maf maxes with a decent scanner. Good luck.
Thread Starter
Melting Slicks
Joined: Aug 2002
Posts: 2,103
Likes: 0
From: Tacoma WA your Junk Yard Dogg
Re: 2nd VORTECH dyno (QuickSilver2002)
i have new plugs..NGK TR-6 at .035 and new msd wires.....i have a new tune for mondays dyno runs....hopefully i will be closer to safe on this tune...i would rather lose some power and be able to stay in boost all day long....i love this car with the supercharger......hopefully i can get this thing just right..Johan at diablosport has been simply awesome with his customer service.....every email has been returned super fast and he asks for some info and i have a new tune in my email inbox the next day :hurray: :hurray: :hurray: service cant be anybetter... :yesnod:
Drifting
Joined: Dec 2000
Posts: 1,723
Likes: 0
From: Puyallup WA
Re: 2nd VORTECH dyno (corvette184)
Hope things work out better this time. Third times a charm :yesnod:
So, let me know when you are going to the dyno, I might be able to take "lunch" and meet you down there.
Perry
So, let me know when you are going to the dyno, I might be able to take "lunch" and meet you down there.
Perry
Drifting
Joined: Jan 2002
Posts: 1,731
Likes: 1
From: Bay Area CA
Re: 2nd VORTECH dyno (corvette184)
I have a dyno sheet that looks just like that. I was told it was either spark delivery problems (bad plugs or wires) or possibly valve float although it is at relitively low rpm.
Check out this thread for some other dyno graphs. :cheers: http://www.ls1tech.com/forums/showth...ht=valve+float
Check out this thread for some other dyno graphs. :cheers: http://www.ls1tech.com/forums/showth...ht=valve+float
Thread Starter
Melting Slicks
Joined: Aug 2002
Posts: 2,103
Likes: 0
From: Tacoma WA your Junk Yard Dogg
Re: 2nd VORTECH dyno (Red C5)
thanks for the link........i just happen to have one of the cool MOORE PERFORMANCE valve spring tools .......maybe a mod for next week.......any recomm... for springs???? maybe just some stock 02 Z06 springs??
Le Mans Master
Joined: May 2000
Posts: 5,377
Likes: 14
From: Kansas City MO
Re: 2nd VORTECH dyno (corvette184)
to be really safe, you need to be 11.5-12. 14+ is VERY dangerous.
that dip is very very common, and can be caused by bad plug wires, bad plugs, defect in stock ls1 cam design, bad tune, etc. do a search for "dip dyno 5500" and you'll get some answers (and more questions).
that dip is very very common, and can be caused by bad plug wires, bad plugs, defect in stock ls1 cam design, bad tune, etc. do a search for "dip dyno 5500" and you'll get some answers (and more questions).
Thread Starter
Melting Slicks
Joined: Aug 2002
Posts: 2,103
Likes: 0
From: Tacoma WA your Junk Yard Dogg
Re: 2nd VORTECH dyno (tattooed)
hhhhhhhhhmmmmmmmmm.....found this link at ls1 tech......looks almost identicle to my dyno graph http://www.ls1tech.com/forums/showth...light=dyno+dip