Home
Don't have an account? Create one now! It's always free!


Forgot Password
Ed's Auto Parts - Mention MOTORGEN for a Discount!
Motorgen Sponsor: McLeod Racing
Motorgen Sponsor: American Muscle - Add style and performance to your Stang
Motorgen Sponsor: Hall Fabrication & Racing
Motorgen Sponsor: Injectors Plus - Performance Fuel Delivery Systems
Reply
 
Thread Tools
Old 06-21-2015, 06:05 AM   #1
enkeivetteenkeivette is offline
Super Moderator
 
enkeivette's Avatar
 
Join Date: Dec 2007
Posts: 6,850
Default 200 hp

My Vette feels like it has 200hp. What, the, fuck??

I replaced the intake manifold gaskets because it was seeping oil. Took the carb apart and cleaned it. But the car has a rough acceleration now.

From low to mid rpm it feels almost like its either super rich, or Im missing fire in one cylinder. But the AFR checks out. And it literally feels like Im down 400hp, Sooo what the fuck?? Help me. Im a yuppie now, forgot how to tune.
__________________
I <3 forced induction.
  Reply With Quote
Old 06-21-2015, 10:00 AM   #2
94cobra69ss39694cobra69ss396 is offline
Fast & Filthy
 
94cobra69ss396's Avatar
 
Join Date: Jun 2008
Posts: 3,840
Default

Did you do a compression test? Also check the plugs because if it was pulling from the lifter valley it would have been running lean and may have burned a plug.
  Reply With Quote
Old 06-21-2015, 03:56 PM   #3
VettezukiVettezuki is offline
I, Vettezuki
 
Vettezuki's Avatar
 
Join Date: Feb 2006
Posts: 14,754
Default

If it's not missing, but way down on power, sounds like lost compression as first guess. Any signs of blow by, consuming oil, typical shot rings kind of stuff?
__________________
Motorgen on
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Motorgen on
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Motorgen Project Car
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
(active)
Motorgen Project Car
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
(back burner)
  Reply With Quote
Old 06-21-2015, 07:46 PM   #4
enkeivetteenkeivette is offline
Super Moderator
 
enkeivette's Avatar
 
Join Date: Dec 2007
Posts: 6,850
Default

Ok. Ill check the plugs and do a compression test. Maybe I just fucked up the intake manifold gasket install. Ug.

Doubt the rings are bad. They have about 2k miles on them.
__________________
I <3 forced induction.
  Reply With Quote
Old 06-21-2015, 07:47 PM   #5
enkeivetteenkeivette is offline
Super Moderator
 
enkeivette's Avatar
 
Join Date: Dec 2007
Posts: 6,850
Default

The HGs on the other hand have been reused and copper sprayed 4 times now. Might have a leaky HG. But even with my last dyno run leaking 8 psi through my HG it still made over 400 whp. This feels like L48 slow.
__________________
I <3 forced induction.
  Reply With Quote
Old 06-21-2015, 09:03 PM   #6
Shaolin CraneShaolin Crane is offline
pain's fun, hit me again
 
Shaolin Crane's Avatar
 
Join Date: Sep 2009
Posts: 6,264
Default

You can be down a cylinder and have AFR check out. My last fuel system issue I lost two cylinders on each side and the AFR still read normal. If you have a laser temp fun check header primary temps.
__________________
Quote:
Originally Posted by Bruce Lee
Forget about winning and losing; forget about pride and pain. Let your opponent graze your skin and you smash into his flesh; let him smash into your flesh and you fracture his bones; let him fracture your bones and you take his life. Do not be concerned with escaping safely — lay your life before him

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Stopping the world!
  Reply With Quote
Old 07-05-2015, 10:44 PM   #7
enkeivetteenkeivette is offline
Super Moderator
 
enkeivette's Avatar
 
Join Date: Dec 2007
Posts: 6,850
Default

FUCKIN BALLS my Vette's fast. I forgot what it was like to drive that car.

I did a compression test, cylinders checked out, all 100-110. But 4 of the spark plugs were super oil fouled. (From when my intake was sucking oil in from the lifter valley). I changed all the plugs, and woah... Smoother idle, touchy throttle, crazy hp and no rough accel.The left exhaust bank smoked for the first 10 mins burning the oil caked in those cylinders.

I put the hammer down fast at about 45mph and almost got sideways. Btw, what is the lowest PSI I can run 19" low pro tires at? I'm at 17 now.
__________________
I <3 forced induction.
  Reply With Quote
Old 07-06-2015, 09:56 AM   #8
94cobra69ss39694cobra69ss396 is offline
Fast & Filthy
 
94cobra69ss396's Avatar
 
Join Date: Jun 2008
Posts: 3,840
Default

I hope your gauge just reads low because 100-110 is really low. The Explorer cold cranks 150, the Cobra cranks 170-180 and if I remember correctly the Chevelle cranks 210. Compression ratios are 9.07, 9.28 and 12.2 respectively.
  Reply With Quote
Old 07-06-2015, 04:42 PM   #9
Shaolin CraneShaolin Crane is offline
pain's fun, hit me again
 
Shaolin Crane's Avatar
 
Join Date: Sep 2009
Posts: 6,264
Default

Mine cranks cold in the 150 range too. 9.36:1 compression.
__________________
Quote:
Originally Posted by Bruce Lee
Forget about winning and losing; forget about pride and pain. Let your opponent graze your skin and you smash into his flesh; let him smash into your flesh and you fracture his bones; let him fracture your bones and you take his life. Do not be concerned with escaping safely — lay your life before him

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Stopping the world!
  Reply With Quote
Old 07-06-2015, 09:32 PM   #10
VettezukiVettezuki is offline
I, Vettezuki
 
Vettezuki's Avatar
 
Join Date: Feb 2006
Posts: 14,754
Default

There's kind of a a lot to engine cranking pressure, but agree 100-110 sounds pretty low. I know he has a big cam and its a stroker, but I don't think his CR was that low.

http://www.not2fast.com/turbo/compre...pressure.shtml


PS 17 PSI on low pro street tires feels like asking for trouble, but I have no knowledge or data about it.
__________________
Motorgen on
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Motorgen on
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Motorgen Project Car
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
(active)
Motorgen Project Car
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
(back burner)
  Reply With Quote
Reply


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off


All times are GMT -7. The time now is 12:35 AM.