Throttle Body

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Mar 22, 2001 | 01:52 AM

robert1

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From: Racine, WI

Throttle Body

Can someone tell me where the crossover lies for a 52mm vs. a 58mm? Whats the minimum for the 58? Would it be overkill on a 355", 330hp? Thanks

Mar 22, 2001 | 10:58 PM

JETHROIROC

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Joined: Oct 2000

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From: Tennessee

You shouldn't need a 58mm TB, since I'm pretty sure even the RamJet 502 uses a stock 52mm TB and puts out well over 330hp. Spend your money elsewhere, IMO.

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1990 IROC 350
Mods: Too busy trying to make it run right to mod it.
Airfoil, Dynomax cat-back, Accel coil, 180 t-stat, Bald Eagle tires,
Hypertech fan switch, Ruger P95DC, hot wife, new oil filter,
thick rubber floormats, towels in the seats.
18.0 @ 85MPH since I'm one big-a$$ MF
"It's better to have and not need than to need and not have."

Mar 22, 2001 | 11:02 PM

IROCZTWENTYGR8

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From: In a mint Third Gen!

Car: Red 87 IROC-Z28 T-Top

Engine: 5.7 Tuned Port Injection

Transmission: 700R4 Auto

Axle/Gears: BW 9-Bolt 3.27

The 502 uses a 48mm TB, which is stock for the L98.

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Looking For:

87 IROC-Z28 350 TPI: The car I want.

84 TRANS AM 305 H.O.: Another car that would be OK to own while I look for the IROC-Z!!

Mar 23, 2001 | 12:21 AM

Kevin91Z

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Posts: 10,950

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From: Orange, SoCal

Car: 1990 Pontiac Trans Am

Engine: 355 TPI siamesed runners

Transmission: Tremec T56

Axle/Gears: 12-Bolt 3.73

Its my opinion that you only need a 58mm for a SuperRam or Miniram, or if you're running a blower or nitrous. With a stock-style TPI intake, 52mm is fine.

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West Coast GM Shootout 2001!
1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

Mar 23, 2001 | 12:28 PM

91RedBigFinZ

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Joined: Mar 2001

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From: Indianapolis, IN

Are you sure about the 48mm stock l98 TB? I thought it was close to 52mm.

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'91 Z28 50,000 miles:
K&N; Fastchip; Airfoil; Custom 'Ram-Air'; SLP Headers; Slp Runners; Borla Catback 50% open; Poweraid TB spacer; March underdrive pulleys; Accel Extreme 9000 wires, coil; Hypertech rotor, cap; NGK platinum plugs; manual fan switch; TB coolant bypass; Pirelli P7000 Z245/50/R16 all season tires; Energy suspention motor mounts.

Mar 23, 2001 | 01:00 PM

rondubbs

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Joined: Nov 1999

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From: Staten Island, NY

Quote:

<font face="Verdana, Arial" size="2">Originally posted by 91RedBigFinZ:
Are you sure about the 48mm stock l98 TB? I thought it was close to 52mm.

</font>

stock 305 and 350tpi have a 48mm tb.

Mar 27, 2001 | 05:46 PM

irocbob89

Junior Member

Joined: Mar 2001

Posts: 36

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From: keller (fort worth) Tx

48 mm is stock

robert1- you need a 52mm tb

i have the hollie 58mm for my application

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89 red iroc-z
386 strocker
ross pistons 10.5.1
eagle h-beam rods
miniram
slp cam 224 230 535 544
1.6rr
edelbrock performers p+p
ford 9', 4.11, 31 spline
baer rear brakes
line lock
all the bolt ons
200 shot on the way