Dyno Numbers!
Thread Starter
Burning Brakes
Joined: Mar 2008
Posts: 1,073
Likes: 8
From: Houston TX
Dyno Numbers!
Over the weekend, I strapped my stock LT4 to the dyno:
297 rwhp
302 rwtq
Not a bad place to start...I'm thinking a full Borla exhaust, long tube headers, LT4 hot cam, and a dyno tune should really wake it up!
All it takes is money, and that might take a few months...Still, I'm happy with those numbers!
297 rwhp
302 rwtq
Not a bad place to start...I'm thinking a full Borla exhaust, long tube headers, LT4 hot cam, and a dyno tune should really wake it up!
All it takes is money, and that might take a few months...Still, I'm happy with those numbers!
Le Mans Master
Joined: Nov 2006
Posts: 5,032
Likes: 204
From: Greenwood Indiana
2021 C4 of the Year - Modified Finalist
C4 of Year Finalist (appearance mods) 2019
I dynoed my all-stock LT1 a couple of years ago w/ 270 hp & 301 tq ATW.
LT4s are rated 30hp higher than LT1s, so you are right on target.
Those mods you want should really wake it up. Good numbers.
LT4s are rated 30hp higher than LT1s, so you are right on target.
Those mods you want should really wake it up. Good numbers.
Racer
Joined: Jul 2005
Posts: 387
Likes: 3
From: Indian Trail, NC
doing the heads is good if you want to completely tear down the engine. if you just want to do bolt-on's, headers and full exhaust is the way to go. but at the same time, the cam isn't exactly bolt on...
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Pro
Joined: Jan 2003
Posts: 515
Likes: 3
From: newark DE
more proof that the LT4s are stronger than advertised, and every bit as powerful as the LS1s that replaced them
my bone stock LT1 dynoed 266/306, so it looks like LT4s were 30hp stronger than a LT1... except that figure seems to be REAR WHEEL hp, not flywheel
awesome #s!
my bone stock LT1 dynoed 266/306, so it looks like LT4s were 30hp stronger than a LT1... except that figure seems to be REAR WHEEL hp, not flywheel
awesome #s!
Melting Slicks
Joined: Oct 2006
Posts: 2,238
Likes: 10
From: College Station TX
LT4 dyno results and the LT4>LS1 discussion starts up...again. 
I'll take an LS1 over an LT4 every day of the week, and twice on Sunday (and yes, I actually own one of both).
To the OP: Nice numbers! Long tubes and exhaust is a great starting point. I'm not a big fan of the EWP, but others really like them. Head and intake porting with a cam will add some power, but that's hardly bolt on work.
I'll take an LS1 over an LT4 every day of the week, and twice on Sunday (and yes, I actually own one of both).
To the OP: Nice numbers! Long tubes and exhaust is a great starting point. I'm not a big fan of the EWP, but others really like them. Head and intake porting with a cam will add some power, but that's hardly bolt on work.
Thread Starter
Burning Brakes
Joined: Mar 2008
Posts: 1,073
Likes: 8
From: Houston TX
lt4 dyno results and the lt4>ls1 discussion starts up...again.
I'll take an ls1 over an lt4 every day of the week, and twice on sunday (and yes, i actually own one of both).
To the op: Nice numbers! Long tubes and exhaust is a great starting point. I'm not a big fan of the ewp, but others really like them. Head and intake porting with a cam will add some power, but that's hardly bolt on work.
I'll take an ls1 over an lt4 every day of the week, and twice on sunday (and yes, i actually own one of both).
To the op: Nice numbers! Long tubes and exhaust is a great starting point. I'm not a big fan of the ewp, but others really like them. Head and intake porting with a cam will add some power, but that's hardly bolt on work.
Drifting
Joined: May 2005
Posts: 1,370
Likes: 1
From: Raleigh NC
For what it's worth, my LT4 made almost the exact same numbers as yours stock.
- with headers, tune, and electric water pump it made 327rwhp and about the same torque number
- with a Hotcam it made 354rwhp & 348rwtq
- with no belt on it, it made 361rwhp
- with headers, tune, and electric water pump it made 327rwhp and about the same torque number
- with a Hotcam it made 354rwhp & 348rwtq
- with no belt on it, it made 361rwhp
Le Mans Master
Joined: Oct 2004
Posts: 7,706
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From: Everett WA
C4 of Year Finalist (appearance mods) 2019
You aren't going to gain much if anything from an aftermarket cat back system. Your LT4 stock exhaust is fairly non restrictive up to about the volume need for 400rwhp.
LT headers and the hot cam will do much more for you than an exhaust system.
LT headers and the hot cam will do much more for you than an exhaust system.
Race Director
Joined: Jan 2002
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From: O'Fallon Missouri
Le Mans Master
Joined: Aug 2004
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From: Metairie Louisiana
Avg LT1 270ish rwhp rated at 300hp
Avg LT4 300ish rwhp rated at 330hp
Difference of 30 hp+- each.
Last edited by rickneworleansla; Jun 10, 2009 at 07:39 AM.
Drifting
Joined: May 2005
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From: Chicago Executive Airport, formerly known as Palwaukee
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Lots of theories. Do a search here. I do not want to add to the speculation.
All I will say is this: I own an LT4 that I purchased new. I have over 106,000 miles. I have spanked every stock C5 I have ever seen. You tell me why!
Le Mans Master
Joined: Aug 2004
Posts: 5,141
Likes: 7
From: Metairie Louisiana
All the LT4s are stronger than what GM told us.
Lots of theories. Do a search here. I do not want to add to the speculation.
All I will say is this: I own an LT4 that I purchased new. I have over 106,000 miles. I have spanked every stock C5 I have ever seen. You tell me why!
Lots of theories. Do a search here. I do not want to add to the speculation.
All I will say is this: I own an LT4 that I purchased new. I have over 106,000 miles. I have spanked every stock C5 I have ever seen. You tell me why!
