dizwiz24 massive modifications
Thread Starter
Race Director
Joined: Sep 2001
Posts: 14,682
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From: NEwhere Ohio
140 is a seriously lofty goal considering his previous traps. Likely 250-300 more whp needed. I don't doubt the car was making the power Diz stated it made previously but I think the car is a lot heavier than a typical c4 vert. Got to be around 3700-3800 raceweight. He is going to need 750whp to get there especially if he isn't going to spin it up much and then shift into 5th. I am not certain these mods will get him to that power level or not. 130s not out of the question though.
Diz, get a dragy or P gear, scale the car and tune that beast up and get some times. 60-130 or custom 40-100 times can really help you out. No need to drive a couple hours to the track.
Diz, get a dragy or P gear, scale the car and tune that beast up and get some times. 60-130 or custom 40-100 times can really help you out. No need to drive a couple hours to the track.
12 lb flywheel ipo of 40 lb stock dual mass one
manual seats instead of the power one.
removed spare tire (though an 8 gallon methanol tank resides there)
removed A/C system. (Though a supercharger head unit was added).
6 point cage ??? I cant inagine it adding more than 80 lbs
removed vert x brace (im caged - didnt see need for it).
Lightweight baer eradispeed 2 piece 13” rotors.
removed rear storage console lids
me at 155 lbs
Thread Starter
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Joined: Sep 2001
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From: NEwhere Ohio
...we're awake, but we're very puzzled. Hard to know where to start here, but let's try with gearing. Look at the chart. Insert appropriate values.
http://www.pszweb.com/car/gears.htm
5300 rpm is only good for 114 mph in 4th gear w-3.45 and 810 rev/mile tire. 6000 rpm gets you to 129 mph which is only C6 Z06 territory (~440 rwhp). For the lofty goals, a 140 mph trap speed target should be in order, which means ~6500 rpm with current gear and tire. I already forgot what I was going to say next. Mongo likes candy.
http://www.pszweb.com/car/gears.htm
5300 rpm is only good for 114 mph in 4th gear w-3.45 and 810 rev/mile tire. 6000 rpm gets you to 129 mph which is only C6 Z06 territory (~440 rwhp). For the lofty goals, a 140 mph trap speed target should be in order, which means ~6500 rpm with current gear and tire. I already forgot what I was going to say next. Mongo likes candy.
For the record. i never stated a 140 mph trap speed goal.
i said i only revvd it to 5200-5300 rpm during my test run the other day . So I could look at fuel trims and knock activity before revving higher
i mentioned I am seeing 14+ psi boost at 5200-5300 rpm.
Since I have a centrifugal blower, that boost is gonna increase with rpm, so i stated a 6000 rpm rev limiter considering my stock bottom end.
by 6000, i will likely be seeing 16-17psi boost.
Last edited by dizwiz24; Apr 17, 2021 at 03:56 PM.
Team Owner
Joined: Aug 2004
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From: Park City Utah
Thread Starter
Race Director
Joined: Sep 2001
Posts: 14,682
Likes: 753
From: NEwhere Ohio
my 60 ft is the problem.
so are they saying ill need to plan on a 140 trap to make up for a lousy 60 ft?
if so, i have a problem with that statement. They are assuming I wont be able to ‘learn’ or ‘improve’ it any - like im some kind of retard, incapable of learning.
ive clearly stated the problem of over crowding at the tracks. I can spend 6-8 hrs there and get to go 2x, if im lucky.
During that 1st run, knowing it may be my only run, I purposefully launch conservatively so I can datalog a full range of data without having to ‘lift’ in 1st bc I was too aggressive with the clutch dump at launch.
this data is critical.
Am I getting false knock at the launch ? And should i turn off the knock sensors in that range?
Am I getting real knock on the big end ?
how are my afr’s ?
there isnt time to ‘learn’ a technique on my 6 spd car.
I need a private track rental vs JoePublic test and tune.
coupled with an hour+ drive to and from the track, it can be a day waster
Last edited by dizwiz24; Apr 17, 2021 at 07:06 PM.
Drifting
Joined: Mar 2018
Posts: 1,362
Likes: 400
From: DFW TX
I think you will need low 130s to overcome most c8s with your current 60 ft issue and you still won't be in the 10s.
I was just pointing out that aiming for 140 is pretty far out there. I know your weren't claiming 140 as a goal Diz. I was responding to Tequilaboy.
I have the same issue with going to the track. 70 miles oneway and no idea how many runs I will get. Plus last time out I broke it and had to tow it back at a $400 expense. I know it isn't the best thing to do to test on the street but rolling start testing/tuning is pretty easy on the car if you can find an open road. You can also do a bunch of 0-60 type runs and coast through the 1/8 mark and get your 60ft times with the dragy or P Gear. Not that they are all that accurate but you can simply subtract 4-5 hundredths and it would be really close.
I am in the process of more mods myself. I am going to install the Tilton flow control valve soon and hopefully that can cure my inability to finesse the clutch pedal and get my 60s down into at least the 1.8s.
I was just pointing out that aiming for 140 is pretty far out there. I know your weren't claiming 140 as a goal Diz. I was responding to Tequilaboy.
I have the same issue with going to the track. 70 miles oneway and no idea how many runs I will get. Plus last time out I broke it and had to tow it back at a $400 expense. I know it isn't the best thing to do to test on the street but rolling start testing/tuning is pretty easy on the car if you can find an open road. You can also do a bunch of 0-60 type runs and coast through the 1/8 mark and get your 60ft times with the dragy or P Gear. Not that they are all that accurate but you can simply subtract 4-5 hundredths and it would be really close.
I am in the process of more mods myself. I am going to install the Tilton flow control valve soon and hopefully that can cure my inability to finesse the clutch pedal and get my 60s down into at least the 1.8s.
Last edited by Krusty84; Apr 17, 2021 at 07:43 PM.
Team Owner
Joined: Aug 2004
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From: Park City Utah
IDK if "140" is the precise, exact, on-point number that you need to trap to match or beat these cars that you say you want to beat, but Tequilaboy is right that you need to make up for a bunch of shortcomings with hp and trap.
Team Owner
Joined: Aug 2004
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From: Park City Utah
I think that you should get your datalogging/tuning done on an abandoned street...then focus on your driving at the track. Working on tunes at the track IS a "day wasted".
.
Last edited by Tom400CFI; Apr 17, 2021 at 08:27 PM.
Drifting
Joined: Apr 2020
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From: Orange, CA
Wow so “beating a C8” to you really is just “beating a stock C8 down a 1/4 mile straight line?”
At least that seems like a more reasonable goal now. Won’t prove anything as your boisterous attitude seems to suggest all the time, but best of luck to you on getting it done. The mods all look solid, and I love that spare tire well fuel cell setup.
At least that seems like a more reasonable goal now. Won’t prove anything as your boisterous attitude seems to suggest all the time, but best of luck to you on getting it done. The mods all look solid, and I love that spare tire well fuel cell setup.
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Le Mans Master
Joined: Apr 2000
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From: Manassas VA
Do you have a 1/8 mile track that is closer? My experience has been that usually test and tunes are not nearly as busy as the qtr. Mile tracks.
In reality there is little reason to run more then the 1/8 for true test and tune. Can practice your launch, shifts, and even data log for tuning.
Another point that you probably don't want to hear, but get a set of wheels and put some mickey Thompson drag radials on for track use.
They will be more consistent, help with wheel hop, and hook better then any autocross or street tire.
In reality there is little reason to run more then the 1/8 for true test and tune. Can practice your launch, shifts, and even data log for tuning.
Another point that you probably don't want to hear, but get a set of wheels and put some mickey Thompson drag radials on for track use.
They will be more consistent, help with wheel hop, and hook better then any autocross or street tire.
Racer
Joined: Nov 2020
Posts: 289
Likes: 48
From: Dover N.H.
Wow so “beating a C8” to you really is just “beating a stock C8 down a 1/4 mile straight line?”
At least that seems like a more reasonable goal now. Won’t prove anything as your boisterous attitude seems to suggest all the time, but best of luck to you on getting it done. The mods all look solid, and I love that spare tire well fuel cell setup.
At least that seems like a more reasonable goal now. Won’t prove anything as your boisterous attitude seems to suggest all the time, but best of luck to you on getting it done. The mods all look solid, and I love that spare tire well fuel cell setup.
Racer
Joined: Aug 2016
Posts: 354
Likes: 54
...we're awake, but we're very puzzled. Hard to know where to start here, but let's try with gearing. Look at the chart. Insert appropriate values.
http://www.pszweb.com/car/gears.htm
5300 rpm is only good for 114 mph in 4th gear w-3.45 and 810 rev/mile tire. 6000 rpm gets you to 129 mph which is only C6 Z06 territory (~440 rwhp). For the lofty goals, a 140 mph trap speed target should be in order, which means ~6500 rpm with current gear and tire. I already forgot what I was going to say next. Mongo likes candy.
http://www.pszweb.com/car/gears.htm
5300 rpm is only good for 114 mph in 4th gear w-3.45 and 810 rev/mile tire. 6000 rpm gets you to 129 mph which is only C6 Z06 territory (~440 rwhp). For the lofty goals, a 140 mph trap speed target should be in order, which means ~6500 rpm with current gear and tire. I already forgot what I was going to say next. Mongo likes candy.
Racer
Joined: Aug 2016
Posts: 354
Likes: 54
I do agree that 140mph trap speed requires considerable HP when the 60' times are suffering.
My 87 was running high 10s and regular low 1.5s (personal best on that combo of 1.48s). When I moved to the 408 with the F1R, the car would repeatedly 60" in the high 1.6 to low 1.7 range. I have never run the larger blower combo on slicks, as I suspect I will be back to breaking driveline parts (McLeod clutch, ZF6, 3.33D44).
If one has a slow 60', you must 'freight train" on the big end to compensate..
My 87 was running high 10s and regular low 1.5s (personal best on that combo of 1.48s). When I moved to the 408 with the F1R, the car would repeatedly 60" in the high 1.6 to low 1.7 range. I have never run the larger blower combo on slicks, as I suspect I will be back to breaking driveline parts (McLeod clutch, ZF6, 3.33D44).
If one has a slow 60', you must 'freight train" on the big end to compensate..
Drifting
Joined: Jun 2001
Posts: 1,704
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From: Mass Mass
Have a screen capture in my C4 Corvette hood scoop saved files?
Maybe that will jog someone's memory.
Melting Slicks
Joined: Mar 2016
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From: Langley BC
Last edited by DMITTZ; Apr 19, 2021 at 12:30 PM.
Drifting
Joined: Jun 2001
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From: Mass Mass
tequilaboy ... I kind of thought it was you 
Cold Air Intake Test Results
https://www.corvetteforum.com/forums...t-results.html
Cold Air Intake Test Results
https://www.corvetteforum.com/forums...t-results.html
Racer
Joined: Aug 2016
Posts: 354
Likes: 54
I do believe that is the car I was remembering. Thank you for posting.
If it is not too difficult to post a pic, I'll gladly share a few pics of my set-up. Do we still have to pay for a photobucket acct? The FB groups are so much easier.
If it is not too difficult to post a pic, I'll gladly share a few pics of my set-up. Do we still have to pay for a photobucket acct? The FB groups are so much easier.
Last edited by KSA Aaron; Apr 19, 2021 at 04:32 PM.
Drifting
Joined: Jun 2001
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From: Mass Mass
https://www.corvetteforum.com/forums...-pictures.html
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From: moraga ca