looking to upgrade tb. installing headers finaly and other stuff.
anyone have either tb and have feedback on it.
ed
anyone have either tb and have feedback on it.
ed
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1995 Z28 A4, SCC Ultra Z Hood with Air box/K&N filter, Granatelli Maf Sensor/Fernco bellow/Hotchkis STB/white face gauges/LT4 Knock module/March pullies/160* stat without Hypertech Tunning/Borla 3" y-pipe/HI Flo 3" cat/SLP Loudmouth/GM Motive 3.73's + TA rear end girdle/Afs ZR1's silver painted with polished lip 17x9.5 front & 17x11 out back/98 tail light's/BMR SFC's/spohn Lca's/spohn relo brackets & spohn adj. panhard rod " coated mid lenght pacesetters headers + 1.6rr + custom pc tuning going on soon hopefully " -
Honestly, I think most would agree...if you're not doing heads and cam, the 48 mm TB is more than sufficient. I'd venture to say it's good up to 375 hp...Al 96 Ram Air T/A
Mods: Build # 784 * Hotchkis STB * SFCs * Borla cat back w/QTP cut-out * AS&M/RK Sports Mid-length headers w/single CAT * Koni SA shocks on lower perch w/ lowered rear * Strano Hollow front & rear antisway bars * 1LE front/rear springs * 1LE aluminum driveshaft * Strange 4.10 gears w/ Zexel Torsen diff. * ARP bearing cap studs & aluminum diff cover* J&M Hotpart poly/poly rear LCAs and poly/poly panhard bar * RAM Powergrip clutch w/ LT4 PP and RAM billet Al flywheel * C5 Z06 brakes * C6 Z06 wheels * Spohn T/A * Spohn DS Loop * fully custom interior w/ custom audio -
I run a 58m TB, and on the engine dyno it was able to support 500HP at only 77% open. Opening the blades farther did not increase air flow measurably. A 52mm TB would have been adequate. Using that flow/HP point, the 48mm TB should be good for about 350-375HP (as noted in the post above) before it becomes a restriction.
I've used both the BBK (same as Edelbrock) and Holley TB's and while both are "adequate", neither is perfect. The BBK/Edelbrock suffers from a whistle and IAC restriction due to casting flash in the IAC hole. The Holley has an issue (at times) with the throttle return spring being weak (or adjusted to loose), and the blades either too large and binding in the bores, or too small and allowing too much air to pass when they are closed.Fred
381ci all-forged stroker - 10.8:1 - CNC LT4 heads/intake - CC solid roller - MoTeC engine management - 8 LS1 coils - 58mm TB - 78# injectors - 300-shot dry nitrous - TH400 - Gear Vendor O/D - Strange 12-bolt - 4.11's - AS&M headers - duals - Corbeau seat - AutoMeter gauges - roll bar - Spohn suspension - QA1 shocks - a few other odds 'n ends. 800HP/800lb-ft at the flywheel, on a 300-shot. 11.5 @ 117MPH straight motorComment
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