Throttle Body expansion - ZR-1 Net Registry Forums

Sgreg · 06-01-2009

Does anyone have the latest tuner info on the 63mm bore TB vs. stock in a ZR-1 with upper end P&P, headers and AM exhaust ? Any improvement with the bigger bore ? Some used to feel it was a negative performance mod if heads are not ported as well.

Sgreg · 06-02-2009

I didn't know this was such a tough one. Anybody on pros and cons of going to a 63mm TB for a upper ported ZR-1 with headers and AM exhaust ??

GOLDCYLON · 06-02-2009

Jeffvette told me once unless your going bigger in CDs the enlarged TB is a waste of money even with the top end port with matched heads and long tubes. I asked about this when I had my top end done.

06-02-2009

Spend the money elsewhere.

Sgreg · 06-02-2009

I think it is Marc who does the 63 MM TB with the first level mods; not sure though. If he does, the tuning specs most probably include more fuel. Makes sense that too much air creates a bog in acceleration. I always assumed head work on a 350 inch motor might call for enlarging the TB. I guess Jeff is saying not necessarily so. So until you get to a 368 inch or more cube motor, the larger TB just isn't needed. Man, I almost pulled the trigger on a bigger TB; glad I didn't.

XfireZ51 · 06-02-2009

Greg,

Both Lgaff and myself have 63mm TB with just top end done. What we found is that the bores on the plenum itself need to be matched to the enlarged TB bores otherwise there's no sense to doing it. I can't tell you that I make more power than a top end w/o a 63mm TB. I can tell you I don't have any bog when getting on it. I'll let Lgaff speak for his experience.

GOLDCYLON · 06-02-2009

Dom did you adjust timing?

06-01-2009	#1
Sgreg Join Date: Aug 2006 Location: Texas Posts: 518	Throttle Body expansion Does anyone have the latest tuner info on the 63mm bore TB vs. stock in a ZR-1 with upper end P&P, headers and AM exhaust ? Any improvement with the bigger bore ? Some used to feel it was a negative performance mod if heads are not ported as well. __________________ 1991 ZR-1, Black, Black, # 541

06-02-2009	#2
Sgreg Join Date: Aug 2006 Location: Texas Posts: 518	Re: Throttle Body expansion I didn't know this was such a tough one. Anybody on pros and cons of going to a 63mm TB for a upper ported ZR-1 with headers and AM exhaust ?? __________________ 1991 ZR-1, Black, Black, # 541

06-02-2009	#3
GOLDCYLON Join Date: May 2007 Location: Peoria, AZ Posts: 9,155	Re: Throttle Body expansion Jeffvette told me once unless your going bigger in CDs the enlarged TB is a waste of money even with the top end port with matched heads and long tubes. I asked about this when I had my top end done. __________________ GOLDCYLON - 91 ZR-1 #2014 GOLDCYLON - 90 ZR-1 #2794, 4L60e (Formerly Schrade's) GOLDCYLON - 11 CTS-V Arizona State Director 91 WHITE/BLACK #2014. 380 P&P&PCed,Ported Heads, Jeal Long tubes, Corsa Exhaust/FIKSE FM-5s /LED TLs, LED Headlights, Front Wilwood 6 piston narrowlite calipers and rear Wilwood caliper street shop mod,CNCed Coolant Pipes,TPI Cvr,Filter cover,Stainless Bolts, DRM/DOM PROM /ZFDOC mod build #102,DRLs,BMAD with stainless Debris Screen,Coplan Air Blaster, Pioneer APP Radio 4,Brey-Krause HB,Sub Bar,Fire extinguisher seat mount,DRM Coilovers,LEDs everywhere,Compass mirror (orange),V1 DIC hidden display, Homelink sun visor, Carbon Fiber top x3 and APSIS Carbon Fiber interior, APSIS CF Steering Wheel/NAPA Leather, Banski trailing arms, Guldstrand front suspension,urethane bushings from Prothane (total suspension) ZFDoc drive shaft safety loop, raptor shift light (orange),AO engineering louver front plate, Console seat cushion, 96CE seats with black custom Sheepskins, ss billet catch can,Viper remote entry/alarm,Cragar Rear Louvers,LED side louver lights, Dewitts Radiator with SPAL fans and a Woods 160 T-Stat 90 RED/BLACK #2794. 4L60e Automatic Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless Headers, Corsa Exhaust, SAN Secondaries and Haibeck PROM, Exotic Muscle Coil overs, LED Interior Lights, LED Tail Lights, LED Headlights, 94 Sport seats with black custom Sheepskins , Cragar rear louvers, GS Front calipers, Banski Trailing arms, APSIS Carbon Fiber steering wheel, Front and Rear Baer Eradispeeds, DRLs, Guldstrand front suspension,urethane bushings from Prothane (total suspension), Dewitt's Raditor with Dual SPAL fans and a Haibeck 170 T-Stat 11 RED/GREY CTS-V

06-02-2009	#4
Jeffvette Guest Posts: n/a	Re: Throttle Body expansion Spend the money elsewhere.

06-02-2009	#5
Sgreg Join Date: Aug 2006 Location: Texas Posts: 518	Re: Throttle Body expansion I think it is Marc who does the 63 MM TB with the first level mods; not sure though. If he does, the tuning specs most probably include more fuel. Makes sense that too much air creates a bog in acceleration. I always assumed head work on a 350 inch motor might call for enlarging the TB. I guess Jeff is saying not necessarily so. So until you get to a 368 inch or more cube motor, the larger TB just isn't needed. Man, I almost pulled the trigger on a bigger TB; glad I didn't. __________________ 1991 ZR-1, Black, Black, # 541

06-02-2009	#6
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,709	Re: Throttle Body expansion Greg, Both Lgaff and myself have 63mm TB with just top end done. What we found is that the bores on the plenum itself need to be matched to the enlarged TB bores otherwise there's no sense to doing it. I can't tell you that I make more power than a top end w/o a 63mm TB. I can tell you I don't have any bog when getting on it. I'll let Lgaff speak for his experience.

06-02-2009	#7
GOLDCYLON Join Date: May 2007 Location: Peoria, AZ Posts: 9,155	Re: Throttle Body expansion Dom did you adjust timing? __________________ GOLDCYLON - 91 ZR-1 #2014 GOLDCYLON - 90 ZR-1 #2794, 4L60e (Formerly Schrade's) GOLDCYLON - 11 CTS-V Arizona State Director 91 WHITE/BLACK #2014. 380 P&P&PCed,Ported Heads, Jeal Long tubes, Corsa Exhaust/FIKSE FM-5s /LED TLs, LED Headlights, Front Wilwood 6 piston narrowlite calipers and rear Wilwood caliper street shop mod,CNCed Coolant Pipes,TPI Cvr,Filter cover,Stainless Bolts, DRM/DOM PROM /ZFDOC mod build #102,DRLs,BMAD with stainless Debris Screen,Coplan Air Blaster, Pioneer APP Radio 4,Brey-Krause HB,Sub Bar,Fire extinguisher seat mount,DRM Coilovers,LEDs everywhere,Compass mirror (orange),V1 DIC hidden display, Homelink sun visor, Carbon Fiber top x3 and APSIS Carbon Fiber interior, APSIS CF Steering Wheel/NAPA Leather, Banski trailing arms, Guldstrand front suspension,urethane bushings from Prothane (total suspension) ZFDoc drive shaft safety loop, raptor shift light (orange),AO engineering louver front plate, Console seat cushion, 96CE seats with black custom Sheepskins, ss billet catch can,Viper remote entry/alarm,Cragar Rear Louvers,LED side louver lights, Dewitts Radiator with SPAL fans and a Woods 160 T-Stat 90 RED/BLACK #2794. 4L60e Automatic Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless Headers, Corsa Exhaust, SAN Secondaries and Haibeck PROM, Exotic Muscle Coil overs, LED Interior Lights, LED Tail Lights, LED Headlights, 94 Sport seats with black custom Sheepskins , Cragar rear louvers, GS Front calipers, Banski Trailing arms, APSIS Carbon Fiber steering wheel, Front and Rear Baer Eradispeeds, DRLs, Guldstrand front suspension,urethane bushings from Prothane (total suspension), Dewitt's Raditor with Dual SPAL fans and a Haibeck 170 T-Stat 11 RED/GREY CTS-V

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