LT1 Underrated
Race Director
Joined: Dec 2003
Posts: 12,599
Likes: 1
From: Texas
Originally Posted by kwik_ta
does anyone know what the LS-1 puts to the ground?
Mine with just a Halltech intake did 319.9, I was surprised by that.
Le Mans Master
Joined: Oct 2002
Posts: 7,178
Likes: 1
From: Bahston Mass.
Originally Posted by Mr Mojo
My stock LT1 dynoed at 285 to the wheels. It had a Corsa exhaust, but I don't think that helped much over stock since the car was a hell of a lot faster with the stock exhaust.
Frank, you LOST power putting the Corsa's on???
Explain, I gots lots of time
I continually finding myself wishing Nathan lived closer!!! It'd be good to find someone near me that knew the LT1 inside and out!!!!!!!
Le Mans Master
Joined: Feb 2002
Posts: 7,858
Likes: 2
Originally Posted by 1c44ya
I PUT 1.6:1 RR'S in my lt1 and i didnt need to use the lt4 valve covers , i also didnt change the springs, being that my car does not have high milage and my springs are fine. i didnt use the knock module from the lt4 and my car is not noisy or knocking. i did hear that it would be a good idea to replace the ESC but i havent seen the need for it yet.
Drifting
Joined: Aug 2004
Posts: 1,830
Likes: 1
From: atlanta Georgia
correct me if im wrong but i think its 95 and up c4s have different valve covers that fit the 1.6 rrs and below that they have to be modified or changed. 
your friend
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Sean
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your friend
and supporting vendor
Sean
the Coatings man!
Safety Car
Joined: Apr 2004
Posts: 4,532
Likes: 7
From: Lahaina Hi
I installed 1.6 RR on my lt1 ,lt4 knock sensor cheap,cut the drip tabs inside my factory valve covers and installed the Ls1 bee hive valve springs from comp cams .
I did not change the valve seals.
Runs fast for me 11.21 121 mph 60' 1.67 in the 1/4 Ha Ha
On a 125 shot of juice!!
Stock exaust with cut outs with spair tire removed. Drag raidals never dynoed it ,no air to the engine so no power,why dyno when it's not for real.
If the dyno can blow 100 mph air to the throttle body then I might dyno it.
I did not change the valve seals.
Runs fast for me 11.21 121 mph 60' 1.67 in the 1/4 Ha Ha
On a 125 shot of juice!!
Stock exaust with cut outs with spair tire removed. Drag raidals never dynoed it ,no air to the engine so no power,why dyno when it's not for real.
If the dyno can blow 100 mph air to the throttle body then I might dyno it.
Race Director
Joined: May 2001
Posts: 14,165
Likes: 9
On the valve springs it's not a question of mileage, it's a question of coil bind height.
LT1 springs are extremely weak to start with. Installing the 1.6 rockers stresses them even further than they were designed for. You are pushing them so close to coil bind that they simply will not last very long. Furthermore the first time you over-rev your engine and inertia carries that pushrod / lifter / rocker further than it should you just hit coil bind, which means broken parts.
If you value your engine you'll replace the springs when you do the rockers.
LT1 springs are extremely weak to start with. Installing the 1.6 rockers stresses them even further than they were designed for. You are pushing them so close to coil bind that they simply will not last very long. Furthermore the first time you over-rev your engine and inertia carries that pushrod / lifter / rocker further than it should you just hit coil bind, which means broken parts.
If you value your engine you'll replace the springs when you do the rockers.
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Race Director
Joined: Mar 1999
Posts: 16,950
Likes: 0
From: Stafford, Virginia Kittah, Kittah, Kittah...
Originally Posted by STL94LT1
I've seen a few stock LS1 Vettes dyno, and there were around 300-310 rwhp.
Also, it seems like alot of the F-body guys like to qote STD #'s, not the lower SAE #'s that most of the Vette guys use. If the local F-body guys are dynoing at Stiegemieres, they use STD #'s.
Also, it seems like alot of the F-body guys like to qote STD #'s, not the lower SAE #'s that most of the Vette guys use. If the local F-body guys are dynoing at Stiegemieres, they use STD #'s.
On the same dyno, I've seen a 99 Firehawk put down 310 RWHP...
I haven't taken my LT4 to the dyno yet, but I know it does feel quite a bit stronger than my LT1, especially at the upper end...
Melting Slicks
Joined: Jul 2003
Posts: 2,140
Likes: 0
From: Cincinnati Ohio
Originally Posted by Nathan Plemons
Exactly. Most 6-spd LT1's dyno between 265 and 275 rwhp bone stock. Of course there are a few turds and a few monsters out there, but in general 270 RWHP is a very safe bet. .
my cars not a turd...wooo hoooo
Instructor
Joined: May 2001
Posts: 186
Likes: 0
From: Midwest
Originally Posted by REDC4CORVETTE
I installed 1.6 RR on my lt1 ,lt4 knock sensor cheap,cut the drip tabs inside my factory valve covers and installed the Ls1 bee hive valve springs from comp cams .
I did not change the valve seals.
Runs fast for me 11.21 121 mph 60' 1.67 in the 1/4 Ha Ha
On a 125 shot of juice!!
Stock exaust with cut outs with spair tire removed. Drag raidals never dynoed it ,no air to the engine so no power,why dyno when it's not for real.
If the dyno can blow 100 mph air to the throttle body then I might dyno it.
I did not change the valve seals.
Runs fast for me 11.21 121 mph 60' 1.67 in the 1/4 Ha Ha
On a 125 shot of juice!!
Stock exaust with cut outs with spair tire removed. Drag raidals never dynoed it ,no air to the engine so no power,why dyno when it's not for real.
If the dyno can blow 100 mph air to the throttle body then I might dyno it.
EJ
Instructor
Joined: May 2001
Posts: 186
Likes: 0
From: Midwest
As far as stock Corvette LT1/4s being underrated, I don't think so. We have dynoed many of them and they come in approx where we would expect them to. Like always, we see a few percent spread from car to car. I do believe that the F-bodied LTX/LSS cars are underrated though. I don't have numbers in front of me right now and besides, they are Mustang Dyno numbers which no one likes anyway. EJ
Instructor
Joined: Mar 2004
Posts: 116
Likes: 3
From: Knee deep in Amish PA
Originally Posted by wildman378
I posted a thread on this topics awhile back. I have never dynoed mine but It has done 13.2's and it's stock so my guess is it's on the strong side number wise maybe 270ish HP.
I agree. Never had a dyno done, but did 13.1 @ 108.3 w/ just muff elims. Drove a Trans Am the next week that was just a dog. (and more then just the weight difference) I think some of it maybe the break in w/ the LT1. Mine was first owned by a little old lady that didn't know the car had second or third gear!
