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86 C4 4speed trying to make it a 9sec without swap any suggestions?

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86 C4 4speed trying to make it a 9sec without swap any suggestions?

 
Old 05-14-2019, 01:07 AM
  #41  
Rob Burich
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Originally Posted by JoeNova View Post
You'll need a minimum $15,000 budget to do it on the original L98, and that's if you do all of your own labor.

By the way, most newbies think they are going to run 9's on their manual transmission. About .001% can actually do it.
I design 40 spline stub axles. Just bolt in using the factory 3 bolts.
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Old 05-14-2019, 07:12 AM
  #42  
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Originally Posted by 383vett View Post
A manual tranny C4 with a Dana 44 will never be able to run 9's. A C4 with an auto can and has been able to run 9's, but not with a clutch. A manual shocks the rearend severely at launch.
I saw a couple of turbo import cars this weekend at the track running low 9s with manuals, but those cars had to be 2000lbs of less.

At those ET's I don't even want to shift my auto, my goal is to keep the car off the wall.

-- Joe
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Old 05-14-2019, 08:45 AM
  #43  
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Originally Posted by Rob Burich View Post
I design 40 spline stub axles. Just bolt in using the factory 3 bolts.
I guess it depends on price.

Converting to 33 spline outer stubs is $500, but it requires you to upgrade the axle shafts themselves.
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Old 05-14-2019, 09:17 AM
  #44  
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Originally Posted by JoeNova View Post
No hood helps with fitment
.. Pics ? ..
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Old 05-14-2019, 09:28 AM
  #45  
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Originally Posted by C409 View Post
.. Pics ? ..




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Old 05-14-2019, 10:42 AM
  #46  
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Originally Posted by JoeNova View Post
dude.. That's a wicked cool car.. But the OP is talking about a 9 second 'mostly original' car.. Not a vette kart.

Again, car is wicked cool, I'd love to take it for a rip.. But man, this is apples and oranges.

What does that thing even weigh??

-- Joe
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Old 05-14-2019, 10:51 AM
  #47  
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I think when he said mostly original, he meant stockish appearing, not gutted, no 25.1 cage, no solid axle.. etc.

And I'm still saying its do-able, even with the L98. His BIGGEST holdup is the manual trans. Definitely possible, but it'll blow the budget.
A good manual trans, beefed up rear, strong clutch, and proper launch control will add $5-7k to the cost, whereas you can get a 1000 HP capable TH400 with a trans brake for $1500 and a PTC converter for $500 all day long.
Not to mention the average shift time for a manual trans is ~.4 seconds compared to ~.1 for an auto and you'll be shifting 3 times.
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Old 05-15-2019, 12:48 PM
  #48  
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I'm running 9's with a manual at 7500ft DA. It's the stock black tag ZF. That trans will take the abuse. Im also running a Ford 9" with 35 spline axles and a 4 link. Its ran 9.80s with a 464 inch tall deck SBC and a 200 shot of NOS. And 9.70s with a 300 shot, but it should go quicker.
You will have to go thru everything from one end to the other. I think you will spend $15 to 20K to do it. And that's doing most or all the work yourself
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Old 05-15-2019, 02:13 PM
  #49  
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Originally Posted by tpi 421 vette View Post
I'm running 9's with a manual at 7500ft DA. It's the stock black tag ZF. That trans will take the abuse. Im also running a Ford 9" with 35 spline axles and a 4 link. Its ran 9.80s with a 464 inch tall deck SBC and a 200 shot of NOS. And 9.70s with a 300 shot, but it should go quicker.
You will have to go thru everything from one end to the other. I think you will spend $15 to 20K to do it. And that's doing most or all the work yourself
Hi Jim, You do have a beast in your garage! I know a manual tranny can easily run in the nines or less. I doubt if a Dana 44 behind a manual tranny can.
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Old 05-15-2019, 02:41 PM
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Cleetus McFarland has a 7 sec c4 based car.

https://www.thedrive.com/news/23050/...k-shift-record
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Old 05-15-2019, 02:42 PM
  #51  
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Originally Posted by 3D-Aircrew View Post
Cleetus McFarland has a 7 sec c4 based car.

https://www.thedrive.com/news/23050/...k-shift-record
That's a C5 with about $150k invested. Not the same thing.
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Old 05-15-2019, 02:53 PM
  #52  
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IMO "vette varts" stopped being Corvettes when they became pipe cars. No body or interior. No different than a someone calling a vw.pan with a plastic seat and a roll bar a bettle.
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Old 05-15-2019, 03:20 PM
  #53  
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Originally Posted by 383vett View Post
Hi Jim, You do have a beast in your garage! I know a manual tranny can easily run in the nines or less. I doubt if a Dana 44 behind a manual tranny can.
Hi Wille, thanks. You are exactly correct. I dont see a D44 living behind a 9 second manual trans car. Once I was running in the 10.80 to 10.70 range, I started breaking everything back there. Halfshafts, a spindle, and finally I broke the D44 housing.
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Old 05-15-2019, 10:10 PM
  #54  
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LOL! That's not a mostly-stock Corvette, it is a Corvette frame and (some) running gear with an engine that will not possibly fit under a C4's hood. That car has more in common with an Ariel Atom than it does with a stock C4.

What can you do with 4 turbos that you can't do with 2. Is the spool-up that much quicker to make a difference?

It's cool, but you cannot possibly compare how it runs to a stock C4 complete with body. Come on... does it even weigh 2400 lbs? Can you even run it on the street without being worried about FOD to the turbos? Or wearing earplugs? And a helmet?

Last edited by obijohnkenobe; 05-15-2019 at 10:14 PM.
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Old 05-16-2019, 06:59 AM
  #55  
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Originally Posted by tpi 421 vette View Post
I'm running 9's with a manual at 7500ft DA. It's the stock black tag ZF. That trans will take the abuse. Im also running a Ford 9" with 35 spline axles and a 4 link. Its ran 9.80s with a 464 inch tall deck SBC and a 200 shot of NOS. And 9.70s with a 300 shot, but it should go quicker.
You will have to go thru everything from one end to the other. I think you will spend $15 to 20K to do it. And that's doing most or all the work yourself
What do you use for a bell housing?

-- Joe
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Old 05-16-2019, 07:37 AM
  #56  
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Originally Posted by obijohnkenobe View Post
LOL! That's not a mostly-stock Corvette,
LOL! I never said mine was a mostly stock Corvette. Never even said it was close. I'm also not the OP. Wow!

I used it as an example of how X amount of dollars can get a C4 so far. With a total of $12k invested in my car (including the cost of the car), $20k should easily get a stock appearing C4 into the 9s.
I've built entire 9 second cars for less than $15k.
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Old 05-16-2019, 07:52 AM
  #57  
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Originally Posted by JoeNova View Post




.. Corvette ? LOL Now I think I need to see pics of the nova ..
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Old 05-16-2019, 08:25 AM
  #58  
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Its still mechanically a C4, and most upgrades I've done still apply to a typical C4.
Solid mounts, affordable outer stub axle upgrades, TH400 to C-beam adapter, C5 brakes, crazy cheap coilovers, LS swap adapters, and the ones I'm working on now like electric power steering and a bolt-in 8.8 rear swap.

If body panels and interior are what determine a corvette, then you agree that the car is more about the visuals than the mechanicals.
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Old 05-16-2019, 10:44 AM
  #59  
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Originally Posted by JoeNova View Post
Its still mechanically a C4, and most upgrades I've done still apply to a typical C4.
Solid mounts, affordable outer stub axle upgrades, TH400 to C-beam adapter, C5 brakes, crazy cheap coilovers, LS swap adapters, and the ones I'm working on now like electric power steering and a bolt-in 8.8 rear swap.

If body panels and interior are what determine a corvette, then you agree that the car is more about the visuals than the mechanicals.
It's definitely a Corvette. It has Corvette wheels.
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Old 05-16-2019, 10:48 AM
  #60  
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Claiming to be a Corvette gets your pipe buggy license plates. Not all states are will allow home built pipe buggies on public streets. It's more of a SUV; tall off road road tires for muddin or the dunes. Slicks make it a Modified stock car without a body. The body and trim does make it a Corvette.
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