on your face. hah 
Up the boost?
Thread Starter
Launching!
iTrader: (2)
Joined: Feb 2005
Posts: 248
Likes: 0
From: Chesapeake, Virginia
Up the boost? I have a 98 camaro making 560HP 617TQ with a D1SC showing 14-15psi through EPP's FMIC kit. My car is in the shop getting a clutch replaced under warranty so its out of commision anyway.Any reason not to pulley down and add another 5 or so pounds of boost? Any forseeable issues I ought to be aware of?
Its at the shop that tuned it so they can retune easily and I plan to have them retorque the heads since it hasn't been done yet.
The engine is all forged, crower rods, mahle pistons, 9:1 compression with all ARP studs and bolts. Fuel system is a sumped tank, A1000 pump, and all aeromotive lines, rails, regulators and 60# injectors. There is no particular reason I feel the need for more power other than the car is in the shop anyway, and I am curious to see where the safe limit is and what the car will make.
comments please, thanks
Its at the shop that tuned it so they can retune easily and I plan to have them retorque the heads since it hasn't been done yet.
The engine is all forged, crower rods, mahle pistons, 9:1 compression with all ARP studs and bolts. Fuel system is a sumped tank, A1000 pump, and all aeromotive lines, rails, regulators and 60# injectors. There is no particular reason I feel the need for more power other than the car is in the shop anyway, and I am curious to see where the safe limit is and what the car will make.
comments please, thanks
I have a 98 camaro making 560HP 617TQ with a D1SC showing 14-15psi through EPP's FMIC kit. My car is in the shop getting a clutch replaced under warranty so its out of commision anyway.Any reason not to pulley down and add another 5 or so pounds of boost? Any forseeable issues I ought to be aware of?
Its at the shop that tuned it so they can retune easily and I plan to have them retorque the heads since it hasn't been done yet.
The engine is all forged, crower rods, mahle pistons, 9:1 compression with all ARP studs and bolts. Fuel system is a sumped tank, A1000 pump, and all aeromotive lines, rails, regulators and 60# injectors. There is no particular reason I feel the need for more power other than the car is in the shop anyway, and I am curious to see where the safe limit is and what the car will make.
comments please, thanks
Its at the shop that tuned it so they can retune easily and I plan to have them retorque the heads since it hasn't been done yet.
The engine is all forged, crower rods, mahle pistons, 9:1 compression with all ARP studs and bolts. Fuel system is a sumped tank, A1000 pump, and all aeromotive lines, rails, regulators and 60# injectors. There is no particular reason I feel the need for more power other than the car is in the shop anyway, and I am curious to see where the safe limit is and what the car will make.
comments please, thanks
http://www.exoticperformanceplus.com/dyno.php
Maybe the clutch was slipping when you had it tuned? Bob
I think you could do it, but I have only seen people make 18#'s of boost on the D1SC. I have heard of people making 20#'s but never seen it. Guys with the D1 could probably make 20#'s but I doubt (like Bob) that you'll see it on your D1SC.
I have the smallest pulley combo available on my Z28, and on a very cold day at sea level my D1SC only saw 15#'s of boost (granted I only have a ported LT1 intake and ported AFR 180 heads and a very large cam), but even if I had the ideal setup, I doubt I would see more than 2-3#'s more.
I have the smallest pulley combo available on my Z28, and on a very cold day at sea level my D1SC only saw 15#'s of boost (granted I only have a ported LT1 intake and ported AFR 180 heads and a very large cam), but even if I had the ideal setup, I doubt I would see more than 2-3#'s more.
Thread Starter
Launching!
iTrader: (2)
Joined: Feb 2005
Posts: 248
Likes: 0
From: Chesapeake, Virginia
Your rwhp is awfully low for producing 14-15 psi! The most boost we have seen with a D-1SC is 16 psi, done on two different combinations that are shown in my project car section. One is a 346 with Callies Compstar rods, Diamond pistons, Total Seal rings, Patriot LQ9 stage 2 heads, LS6 intake, etc. It is making 740 rwhp on my conservative Mustang Chassis Dyno.
http://www.exoticperformanceplus.com/dyno.php
Maybe the clutch was slipping when you had it tuned? Bob
http://www.exoticperformanceplus.com/dyno.php
Maybe the clutch was slipping when you had it tuned? Bob
Trending Topics
Thread Starter
Launching!
iTrader: (2)
Joined: Feb 2005
Posts: 248
Likes: 0
From: Chesapeake, Virginia
I think you could do it, but I have only seen people make 18#'s of boost on the D1SC. I have heard of people making 20#'s but never seen it. Guys with the D1 could probably make 20#'s but I doubt (like Bob) that you'll see it on your D1SC.
I have the smallest pulley combo available on my Z28, and on a very cold day at sea level my D1SC only saw 15#'s of boost (granted I only have a ported LT1 intake and ported AFR 180 heads and a very large cam), but even if I had the ideal setup, I doubt I would see more than 2-3#'s more.
I have the smallest pulley combo available on my Z28, and on a very cold day at sea level my D1SC only saw 15#'s of boost (granted I only have a ported LT1 intake and ported AFR 180 heads and a very large cam), but even if I had the ideal setup, I doubt I would see more than 2-3#'s more.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo Thread Starter
Launching!
iTrader: (2)
Joined: Feb 2005
Posts: 248
Likes: 0
From: Chesapeake, Virginia
even without retorqueing the heads yet I havent seen any signs of head lift, I feel fairly secure on that front at least. Still am going to have em retightened though.
To determine the impeller speed, the following formula is used:
Maximum impeller speed = crankshaft pulley diameter (N1) divided by supercharger pulley diameter (N2),
multiplied by the step-up ratio (4.10 for the P-series/D series - 5.40 for the F series), multiplied by engine rpm at redline.
Your crankshaft diameter is 7.65, max rpm of the D-1SC is 62,000 rpm.
A 3.40 will put you at 62,730 at 6800 which would be just fine. Bob
Well they guy I am takin about has stock casting heads . I guess the aftermartket head with the thick decks is the ticket to keeping the heads down .
Not to start getting off topic, but generally speaking, a stock high CR engine with non-forged internals + boost will =
His motor is completly built piece it just has stock casting 5.3 ported heads the car makes 780Rwhp
Thread Starter
Launching!
iTrader: (2)
Joined: Feb 2005
Posts: 248
Likes: 0
From: Chesapeake, Virginia
lmpeller Speed
To determine the impeller speed, the following formula is used:
Maximum impeller speed = crankshaft pulley diameter (N1) divided by supercharger pulley diameter (N2),
multiplied by the step-up ratio (4.10 for the P-series/D series - 5.40 for the F series), multiplied by engine rpm at redline.
Your crankshaft diameter is 7.65, max rpm of the D-1SC is 62,000 rpm.
A 3.40 will put you at 62,730 at 6800 which would be just fine. Bob
To determine the impeller speed, the following formula is used:
Maximum impeller speed = crankshaft pulley diameter (N1) divided by supercharger pulley diameter (N2),
multiplied by the step-up ratio (4.10 for the P-series/D series - 5.40 for the F series), multiplied by engine rpm at redline.
Your crankshaft diameter is 7.65, max rpm of the D-1SC is 62,000 rpm.
A 3.40 will put you at 62,730 at 6800 which would be just fine. Bob
Last edited by SR-71 SS; Jun 15, 2008 at 02:26 PM.
