Disappointing performance results
Burning Brakes
Joined: Oct 2008
Posts: 1,184
Likes: 44
From: Orono, Ontario
Well Paul , when you made your runs , did you beat on your car ?
If you want to pull a good time , you have to drive the ever lovin sh*t
out of it !
Like the OP said , with your centri the powerband is exponential with rpm, what did you shift at ?
Not sayin there is nothing wrong with your car , just tryin to help .
Did you go through the traps in 5th gear ? Shifting to 5th can slow your top speed , its a hard gear to get sometimes.
I went through the traps @ 7300 rpm in 4th. I realize you can`t rev that high on a stock block, but these are considerations.
Next year try a higher diameter tire , maybe 1" higher, and that may let you stay in 4th.
Just some suggestions
If you want to pull a good time , you have to drive the ever lovin sh*t
out of it !
Like the OP said , with your centri the powerband is exponential with rpm, what did you shift at ?
Not sayin there is nothing wrong with your car , just tryin to help .
Did you go through the traps in 5th gear ? Shifting to 5th can slow your top speed , its a hard gear to get sometimes.
I went through the traps @ 7300 rpm in 4th. I realize you can`t rev that high on a stock block, but these are considerations.
Next year try a higher diameter tire , maybe 1" higher, and that may let you stay in 4th.
Just some suggestions
Last edited by LedfootLarry; Aug 31, 2013 at 01:47 AM.
Thread Starter
Instructor
Joined: Oct 2012
Posts: 123
Likes: 0
If someone is there to log your run, I'd check the IATs. Could be pulling a ton of timing after that long of a WOT pull at high rpms, power could be affected much differently than a short dyno run. Also what are you shifting at? The higher you shift a centrifugal the more average power it makes as they are the peakiest of FI setups being boosted based on engine speed, so the higher you spin it the more average power(ie faster) you'll be. Hope that helps, good luck next time!
Thread Starter
Instructor
Joined: Oct 2012
Posts: 123
Likes: 0
Well Paul , when you made your runs , did you beat on your car ?
If you want to pull a good time , you have to drive the ever lovin sh*t
out of it !
Like the OP said , with your centri the powerband is exponential with rpm, what did you shift at ?
Not sayin there is nothing wrong with your car , just tryin to help .
Did you go through the traps in 5th gear ? Shifting to 5th can slow your top speed , its a hard gear to get sometimes.
I went through the traps @ 7300 rpm in 4th. I realize you can`t rev that high on a stock block, but these are considerations.
Next year try a higher diameter tire , maybe 1" higher, and that may let you stay in 4th.
Just some suggestions
If you want to pull a good time , you have to drive the ever lovin sh*t
out of it !
Like the OP said , with your centri the powerband is exponential with rpm, what did you shift at ?
Not sayin there is nothing wrong with your car , just tryin to help .
Did you go through the traps in 5th gear ? Shifting to 5th can slow your top speed , its a hard gear to get sometimes.
I went through the traps @ 7300 rpm in 4th. I realize you can`t rev that high on a stock block, but these are considerations.
Next year try a higher diameter tire , maybe 1" higher, and that may let you stay in 4th.
Just some suggestions
Larry your last run was Awesome!
Burning Brakes
Joined: Oct 2008
Posts: 1,184
Likes: 44
From: Orono, Ontario
Shifting just before hitting the rev limiter. Tried to stay in 4th but was about to hit the rev limiter just before the 1/2 mile mark. The cars times and speed are quicker but still pretty close to stock which is why I think something may need tweaking.
Larry your last run was Awesome!
Larry your last run was Awesome!
I drove home with no boost
all good now
Burning Brakes
Joined: Oct 2008
Posts: 1,184
Likes: 44
From: Orono, Ontario
Shifting just before hitting the rev limiter. Tried to stay in 4th but was about to hit the rev limiter just before the 1/2 mile mark. The cars times and speed are quicker but still pretty close to stock which is why I think something may need tweaking.
Larry your last run was Awesome!
Larry your last run was Awesome!
Thread Starter
Instructor
Joined: Oct 2012
Posts: 123
Likes: 0
Safety Car
Joined: Jul 2005
Posts: 4,275
Likes: 4
From: Vancouver WA
Defiantly need a boost gauge when running any kind of FI. I don't know why business's installing and selling kits wouldn't just make it part of the kit. Or at least suggest it to the customer as an add on. But it sounds like you are probably only making about 400 RWHP if you are hooking up good with those tires. Sounds like you have a boost problem. Have you checked for codes on the DIC?
FWIW! I ran 11.67 with my little maggie with only 450 RWHP with PS2 run flats and I had to roll into the throttle easy off the line until about 40-50 mph or I would just smoke the tires. With some sticky tires I know I could have got close to the 10's.
FWIW! I ran 11.67 with my little maggie with only 450 RWHP with PS2 run flats and I had to roll into the throttle easy off the line until about 40-50 mph or I would just smoke the tires. With some sticky tires I know I could have got close to the 10's.
Former Vendor
Joined: Nov 2002
Posts: 4,003
Likes: 12
From: Toronto Ontario
Shifting just before hitting the rev limiter. Tried to stay in 4th but was about to hit the rev limiter just before the 1/2 mile mark. The cars times and speed are quicker but still pretty close to stock which is why I think something may need tweaking.
Larry your last run was Awesome!
Larry your last run was Awesome!
Your blow off valve could be leaking.
Rob.
Last edited by Rob@ChampionMotors; Sep 1, 2013 at 10:30 PM.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
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
Thread Starter
Instructor
Joined: Oct 2012
Posts: 123
Likes: 0
I agree I should have hit 240 or better at the 1/2 mile mark. I'll look at the blow off valve and listen to see if I can tell if it's leaking. Thanks
Drifting
Joined: Mar 2003
Posts: 1,533
Likes: 171
From: Oklahoma City OK
Thread Starter
Instructor
Joined: Oct 2012
Posts: 123
Likes: 0
Rob at Champion motors did the install. They posted the dyno chart and youtube video of the dyno pulls here on the forum. I'm told 592 rwhp is bit more than typical but the not the most they've seen from these kits.
Melting Slicks
Joined: Mar 2005
Posts: 2,225
Likes: 42
From: Okinawa
Thread Starter
Instructor
Joined: Oct 2012
Posts: 123
Likes: 0
I'm just learning about F.I. but I'm getting lot's of help and advice from the Corvette Forum. So I'm sure I'll get it sorted out.
Melting Slicks
Joined: Mar 2008
Posts: 2,412
Likes: 4
From: Houston/Dayton Texas
if you really think there is an issue... start by making a boost leak tester.. cost about $15 and that will tell you if you have leaks anywhere.. then log boost, that will tell you if you have belt slip.. you need to get the mechanics figure out before you start chasing ghost that arnt there. These things are easy to do and will tell you alot.
Melting Slicks
Joined: Oct 2005
Posts: 2,877
Likes: 9
From: Ottawa Ontario
I took a peak at the car and it looks and sounds fine. No visible belt slip, blow off doesn't seem to be sticking or leaking by sound when the you hear the car running at full tilt. We don't see these crazy times that others seem to be able to reproduce in other parts of the world in Ottawa. From my experience a stock Z06 in full street trim with just a blower and 9lbs of boost will usually trap 122 - 127mph on a C5. Add 20mph to that 1/4 mile mph and that would be a rough estimate for a 1/2mile speed. 145mph = 232km. To go anywhere near the 150mph in one of these cars you will need to be powershifting and leave like a mad man. I have a feeling Mr Roadking is probably just getting used to the power. Only thing I have suggested is to buy a flip drive and tighten the belt a little more.
I agree with LedFoot Larry and my Texas connection Boy Mr Blue that you also are not gonna have your best times on your inaugural 1/2 mile race. Lots of seat time and fine tuning can do wonders.
this is coming from someone who has had pretty much every issue you can with these cars over the years.
I agree with LedFoot Larry and my Texas connection Boy Mr Blue that you also are not gonna have your best times on your inaugural 1/2 mile race. Lots of seat time and fine tuning can do wonders.
this is coming from someone who has had pretty much every issue you can with these cars over the years.
Last edited by MotleyDrew; Sep 2, 2013 at 07:04 PM.
Thread Starter
Instructor
Joined: Oct 2012
Posts: 123
Likes: 0
I took a peak at the car and it looks and sounds fine. No visible belt slip, blow off doesn't seem to be sticking or leaking by sound when the you hear the car running at full tilt. We don't see these crazy times that others seem to be able to reproduce in other parts of the world in Ottawa. From my experience a stock Z06 in full street trim with just a blower and 9lbs of boost will usually trap 122 - 127mph on a C5. Add 20mph to that 1/4 mile mph and that would be a rough estimate for a 1/2mile speed. 145mph = 232km. To go anywhere near the 150mph in one of these cars you will need to be powershifting and leave like a mad man. I have a feeling Mr Roadking is probably just getting used to the power. Only thing I have suggested is to buy a flip drive and tighten the belt a little more.
I agree with LedFoot Larry and my Texas connection Boy Mr Blue that you also are not gonna have your best times on your inaugural 1/2 mile race. Lots of seat time and fine tuning can do wonders.
this is coming from someone who has had pretty much every issue you can with these cars over the years.
I agree with LedFoot Larry and my Texas connection Boy Mr Blue that you also are not gonna have your best times on your inaugural 1/2 mile race. Lots of seat time and fine tuning can do wonders.
this is coming from someone who has had pretty much every issue you can with these cars over the years.
Melting Slicks
Joined: Oct 2005
Posts: 2,877
Likes: 9
From: Ottawa Ontario
I appreciate the help and suggestions. I'm new to F.I not modified cars or racing. Although different cars last summer I drove a buddy's supercharged camaro with similar power. You had to modulate the gas when shifting to 2nd or you would just spin the tires and go sideways. In my car the tries chripped and but bit . Grip aside you can feel a huge difference in the power. Bottom line I think the car was making boost but not anywhere near 8 or 9 PSI.