SLP Performance Pac
Thread Starter
Burning Brakes
Joined: Sep 2003
Posts: 1,214
Likes: 0
From: Miami FL
SLP Performance Pac
WOW LT1 makes LT4 power with SLP performance Pac!!! Vette magazine did a "test" These are the dyno #'s
Air foil (the call it a 'booster') = 30 more cfm (not dynoed)
Claw air filter system= 8.3 hp (with 'booster')
Cat back exhaust= 7.7 hp
1.6 roller rockers= 11.4 hp
That's 27hp gain at the rear wheels!!!!
This just don't seem right to me, They claim Stock '95 Vette 6 speed made 277.1 hp/264tq at the wheels (319hp/304tq at crank)before and 304.5hp/292.1tq at the wheels (13% correction factor for drive train loss= 350hp at the crank) after.
What do you guys think?
Air foil (the call it a 'booster') = 30 more cfm (not dynoed)
Claw air filter system= 8.3 hp (with 'booster')
Cat back exhaust= 7.7 hp
1.6 roller rockers= 11.4 hp
That's 27hp gain at the rear wheels!!!!
This just don't seem right to me, They claim Stock '95 Vette 6 speed made 277.1 hp/264tq at the wheels (319hp/304tq at crank)before and 304.5hp/292.1tq at the wheels (13% correction factor for drive train loss= 350hp at the crank) after.
What do you guys think?
Elite Torch Red Member
Joined: Sep 1999
Posts: 57,805
Likes: 23
From: Exit 89 GSP,Lakewood,NJ The Land Of Mojo
Cental/South NJ Events Coordinator
CI 1-2-3-4-5-6-7-8-9-10-11-12 Vet
CI-II Burnout & Drag Champ
St. Jude Donor '03-'04-'05-'06-'07
I'll tell you what I think, SLP hooked me up with those exact parts and I ended up with 350 hp, they never told me where, so I have to assume at the crank.
They used my car to test these products. I haven't had it at the track yet to verify any imporvements.
They also dynoed my car stock and it made 318(again assuming crank HP).
My car with a Corsa dynoed at 285 at the wheels.
They used my car to test these products. I haven't had it at the track yet to verify any imporvements.
They also dynoed my car stock and it made 318(again assuming crank HP).
My car with a Corsa dynoed at 285 at the wheels.
Elite Torch Red Member
Joined: Sep 1999
Posts: 57,805
Likes: 23
From: Exit 89 GSP,Lakewood,NJ The Land Of Mojo
Cental/South NJ Events Coordinator
CI 1-2-3-4-5-6-7-8-9-10-11-12 Vet
CI-II Burnout & Drag Champ
St. Jude Donor '03-'04-'05-'06-'07
Originally Posted by TOO_HOTTVETTE
That's 27hp gain at the rear wheels!!!!
This just don't seem right to me, They claim Stock '95 Vette 6 speed made 277.1 hp/264tq at the wheels (319hp/304tq at crank)before and 304.5hp/292.1tq at the wheels (13% correction factor for drive train loss= 350hp at the crank) after.
What do you guys think?
It was down on power due to the throttlebody not opening all the way. You got me wondering now.
Le Mans Master
Joined: Jan 2002
Posts: 5,556
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From: Jenison MI
Cruise-In VI Veteran
Cruise-In VII Veteran
St. Jude Donor '06
Originally Posted by Mr Mojo
I'm going to have to take a look at that magazine, that just may be my car they are talking about.
It was down on power due to the throttlebody not opening all the way. You got me wondering now.
It was down on power due to the throttlebody not opening all the way. You got me wondering now.
Race Director
Joined: May 2005
Posts: 11,992
Likes: 1,331
From: Middletown, DE
Originally Posted by C4DC
I would say nearly all the hp is a result of the rockers...
I had posted some questions re bolt-ons on the Tech/performance section and the consensus was cat-back, SLP, etc. don't help. Problem was, most of the comments were not supported by data. What little test data I could find, like dyno results, suggests you can get 10-20 HP out of K&N cut lid (or claw) and a cat back. And yet, few believe it.
Is it because those who do the bolt ons and see no improvement after testing don't want to share the results???
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Frank did you have the cut lid with K&N before and SLP claw now??
Typically you can expect around 10chp from the intake mod and 10-15chp from the 1.6:1 RRs. A cat-back change usually brings that sort of gain, so the SLP claim sounds about right.
Typically you can expect around 10chp from the intake mod and 10-15chp from the 1.6:1 RRs. A cat-back change usually brings that sort of gain, so the SLP claim sounds about right.
Last edited by 65Z01; Dec 2, 2005 at 03:25 PM.
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Le Mans Master
Joined: Aug 2002
Posts: 6,080
Likes: 3
From: Clearwater FL
St. Jude Donor '06
Originally Posted by Onyx C4
Why would you say that -- it appears as though they dyno'd these separately. I need to see that article.
I had posted some questions re bolt-ons on the Tech/performance section and the consensus was cat-back, SLP, etc. don't help. Problem was, most of the comments were not supported by data. What little test data I could find, like dyno results, suggests you can get 10-20 HP out of K&N cut lid (or claw) and a cat back. And yet, few believe it.
Is it because those who do the bolt ons and see no improvement after testing don't want to share the results???
I had posted some questions re bolt-ons on the Tech/performance section and the consensus was cat-back, SLP, etc. don't help. Problem was, most of the comments were not supported by data. What little test data I could find, like dyno results, suggests you can get 10-20 HP out of K&N cut lid (or claw) and a cat back. And yet, few believe it.
Is it because those who do the bolt ons and see no improvement after testing don't want to share the results???
Le Mans Master
Joined: Oct 2004
Posts: 7,706
Likes: 485
From: Everett WA
C4 of Year Finalist (appearance mods) 2019
Originally Posted by C4DC
. I don't put much stock in exaggerated filter and exhaust claims for near stock setups which leaves the rockers which change the brains of the way the engine operates the same way a cam does. :
Thanks
Peabody
Melting Slicks
Joined: May 2002
Posts: 2,670
Likes: 4
From: Severna Park MD
Originally Posted by Mr Mojo
I'm going to have to take a look at that magazine, that just may be my car they are talking about.
It was down on power due to the throttlebody not opening all the way. You got me wondering now.
It was down on power due to the throttlebody not opening all the way. You got me wondering now.
This demonstrates what flat-*** flogging an LT1 will do for the engine. 277 hp to the wheels before they added any parts. Your car has always been strong, now the C5 guys have to fear your street car as well as the strip car. WooHoo!
How many miles on it now? Amazing.
Melting Slicks
Joined: May 2002
Posts: 2,670
Likes: 4
From: Severna Park MD
Originally Posted by C4DC
I'm intersted to see a dyno run if Mojo does one... :pop:
Melting Slicks
Joined: May 2002
Posts: 2,670
Likes: 4
From: Severna Park MD
Originally Posted by Mr. Peabody
I need some basic education of you don't mind. I thought that the rockers "simply" reduce friction and thus allow more HP to make it's way from the engine to the rear wheels. How do the rockers alone (without a different cam) change the brains of the way the engine operates?
Thanks Peabody
Thanks
Peabody
Elite Torch Red Member
Joined: Sep 1999
Posts: 57,805
Likes: 23
From: Exit 89 GSP,Lakewood,NJ The Land Of Mojo
Cental/South NJ Events Coordinator
CI 1-2-3-4-5-6-7-8-9-10-11-12 Vet
CI-II Burnout & Drag Champ
St. Jude Donor '03-'04-'05-'06-'07
Thanks Chuck, I'll have to check it out, hell I might even have to buy the issue!
At 277 the car was actually down on power, could be because they took the Corsa off and put the stock back on. I can't tell you how many trips I made to SLP bringing them different parts. I was hoping to run the car at SLP day, but it was cancelled.
The car was strong before and now it is stronger. 133,000 miles on it.
At 277 the car was actually down on power, could be because they took the Corsa off and put the stock back on. I can't tell you how many trips I made to SLP bringing them different parts. I was hoping to run the car at SLP day, but it was cancelled.
The car was strong before and now it is stronger. 133,000 miles on it.
Le Mans Master
Joined: Aug 2002
Posts: 6,080
Likes: 3
From: Clearwater FL
St. Jude Donor '06
Originally Posted by FELNGR8
The 1.6 roller rockers increase total lift as well as acceleration rates at valve opening and closing. They are effective even with the LT1 stock cam, and really effective with the LT4 hotcam.
Melting Slicks
Joined: May 2002
Posts: 2,670
Likes: 4
From: Severna Park MD
Originally Posted by C4DC
The stockers are 1.5 ratio, correct?
SLP emphasized changes that are truly bolt-on that anyone can do. Swapping the cam or valve springs isn't something just anyone can do, but putting on just the 1.6 roller rockers anyone can handle in their garage.
Melting Slicks
Joined: May 2002
Posts: 2,670
Likes: 4
From: Severna Park MD
Originally Posted by Admiral1
Really? Thought it was complicated. I would love to be educated on this!
You have to adjust them afterwards but if you can't do that take it to a tuner shop. You can adjust them initially just by turning over the motor by hand, finding the closed position on each valve, adjusting it to loose, taking up the slack on the pushrod, then turning down the rocker bolt the correct amount.
Replacing valve springs I don't see how you can do it without removing the head to check the specs of height and seat pressure. Replacing the cam is a bitch of a job on these cars with the motor in the car.
The rocker set comes with an EASY button.