Up the boost?
06-13-2008, 09:49 PM
#1
Launching!
Thread Starter
iTrader: (2)
Join Date: Feb 2005
Location: Chesapeake, Virginia
Posts: 248
Likes: 0
Received 0 Likes
on
0 Posts
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
on your face. hah
06-14-2008, 06:21 AM
#4
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
06-14-2008, 07:23 AM
#5
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.
06-14-2008, 08:03 AM
#6
Launching!
Thread Starter
iTrader: (2)
Join Date: Feb 2005
Location: Chesapeake, Virginia
Posts: 248
Likes: 0
Received 0 Likes
on
0 Posts
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
06-14-2008, 04:32 PM
#8
Launching!
Thread Starter
iTrader: (2)
Join Date: Feb 2005
Location: Chesapeake, Virginia
Posts: 248
Likes: 0
Received 0 Likes
on
0 Posts
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.
06-14-2008, 11:08 PM
#9
Launching!
Thread Starter
iTrader: (2)
Join Date: Feb 2005
Location: Chesapeake, Virginia
Posts: 248
Likes: 0
Received 0 Likes
on
0 Posts
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.
06-15-2008, 07:44 AM
#10
We run 18 pounds on my Z28 and don't have any problems. We're using AFR heads which are much thicker than an oem style head. I wouldn't run an oem style past 16 psi. Bob
06-15-2008, 07:53 AM
#11
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
06-15-2008, 08:08 AM
#12
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 .
06-15-2008, 09:44 AM
#13
Not to start getting off topic, but generally speaking, a stock high CR engine with non-forged internals + boost will =
06-15-2008, 11:58 AM
#14
His motor is completly built piece it just has stock casting 5.3 ported heads the car makes 780Rwhp
06-15-2008, 12:44 PM
#15
Launching!
Thread Starter
iTrader: (2)
Join Date: Feb 2005
Location: Chesapeake, Virginia
Posts: 248
Likes: 0
Received 0 Likes
on
0 Posts
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; 06-15-2008 at 02:26 PM.