Anyone running a box upper intake?

Moxie · 01-18-2002, 12:37 PM

Anyone using a Downs, Cartech, or Comp polymer upper, I was just looking for your opinions based on experience. Also, are you running a power adder or not? Thanks.

91GTturbo · 01-18-2002, 03:59 PM

Quote:

Originally posted by Moxie
Anyone using a Downs, Cartech, or Comp polymer upper, I was just looking for your opinions based on experience. Also, are you running a power adder or not? Thanks.

A friend is running the downs upper. I don't have alot of experience, but I'll offer what I know or have heard. They don't work well with NA setups unless it's a high compression, high hp setup. They kill torque, that's why you'll see them mostly on forced induction setups. As far as the power adder, see sig. Dart Jrs currently being installed, was going to upgrade the turbo too, but I want to see what kind of power I can make with this one first.

DirtKing · 01-18-2002, 07:36 PM

I used a downs box upper till I put in the 351... I ran dart srs with it and an extrude honed gt 40 lower. Worked great with the blower...not as much torque on the bottom, but then it was easier on the launch with 373's.

Lawless · 01-18-2002, 10:39 PM

My experince and reading indicates that a "box upper" is best for high rpm (6,000 plus rpm) thats where it really performs. A great intake for a high rpm motor (bullet proof) on the track with forced induction.

For the street I would stick with a long runner intake...... keep the power down in a more usable rpm band.

Jay

01-18-2002, 12:37 PM	#1
Moxie Registered Member Join Date: Aug 2000 Location: Plymouth, MI Posts: 254	Anyone running a box upper intake? Anyone using a Downs, Cartech, or Comp polymer upper, I was just looking for your opinions based on experience. Also, are you running a power adder or not? Thanks.

01-18-2002, 07:36 PM	#3
DirtKing Registered Member Join Date: Feb 1999 Location: brooklyn center,mn,USA Posts: 169	I used a downs box upper till I put in the 351... I ran dart srs with it and an extrude honed gt 40 lower. Worked great with the blower...not as much torque on the bottom, but then it was easier on the launch with 373's. __________________ 88LX notch, Speedpro EFI 358windsor 11.2 to 1 compression, 5 lug baer claws all around..g force t5 and 3.55 gears. rwhp soon to come. Oh yeah...92 octane NO detonation.

01-18-2002, 10:39 PM	#4
Lawless Registered Member Join Date: Aug 2001 Location: Fort McMurray, Alberta, Canada Posts: 24	Reply My experince and reading indicates that a "box upper" is best for high rpm (6,000 plus rpm) thats where it really performs. A great intake for a high rpm motor (bullet proof) on the track with forced induction. For the street I would stick with a long runner intake...... keep the power down in a more usable rpm band. Jay __________________ 1990 LX Mustang(9000km),302,Comp Cam(.597 lift,230 duration,114 lobe separation),1.6 Roller Rockers,Trick Flow Twisted Wedge Heads(ported and polished,o-ringed, Vortech R Trim Cog Supercharger(15 pounds of boost @ 6000 rpm),4:1 FMU,Anderson Power Pipe and Vortech By-Pass Combo,GT-40 Lower Intake,Downs Upper,Accufab 70mm throttle body,Pro-m 77mm MAF(calibrated),36lb Injectors,255 LPH Fuel Pump,T- Rex External Pump, Aeromotive Fuel Regulator,1 5/8 Shorty Headers,3" Mac Exhaust,3.73 Gears,6 BTM Ignition Box,Sub Frame Connectors,Eibach Drag Launch Kit(springs),KYB Gas Shocks,Air Lift Air Bag(right rear spring),Lakewood Traction Bars,BF Goodrich Drag Radials(275/50/15), Weld Draglite Wheels,Hurst Shifter,Centerforce Clutch,Fiberglass Hood,Auto Meter Gauges,Hotchkis Caster/Camber Kit,Trunk Mounted Battery. *Stock Tranny - will replace this summer,axles next.

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