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View Poll Results: Who Still Has Functional Secondaries On Their ZR-1?
I Have Functional Secondaries 29 69.05%
My Secondaries Are Not Functional 13 30.95%
Voters: 42. You may not vote on this poll

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Old 05-22-2022   #11
mcich7781
 
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Join Date: Jun 2015
Location: Morris, IL
Posts: 176
Default Re: Secondaries

My 91 Turq has them. Still work perfectly at 93,000 miles, 368 rebuild about 15,000 miles ago. The engine builder retained them.
20210717_203903.jpg

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Old 05-23-2022   #12
Dynomite
 
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Location: South Dakota/California
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Default Re: Secondaries

Quote:
Originally Posted by HAWAIIZR-1 View Post
I like the secondaries as built primarily due to emissions standard in Japan and it is one of the cool features of the LT5 design. The day there are no longer parts to keep it working I will eliminate them and go from there, but I have spares of everything so it should be working in my lifetime of ownership.


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Concur......Functional Secondaries are one of the "Cool Features" of the LT5 design

I have one ZR-1 with secondaries eliminated and other ZR-1s with completely functional Secondaries
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Old 05-23-2022   #13
staminqia
 
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Join Date: Dec 2020
Location: Pittsburgh
Posts: 134
Default Re: Secondaries

Yup Mine are still functioning. I turn that key every time I pull it out of the garage! '92 - 20kmiles
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Old 05-24-2022   #14
Paul Workman
 
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Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri
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Default Re: Secondaries

Well, just to B different here, mine are eliminated due in part b/c they were smaller than the ports after I ported the runners. (37.5mm+). But, even before the porting, I had Marc eliminate that "feature" after my 2nd dive under the plenum fixing chit (leaks). I've NEVER missed them for a second. And, I love the instantaneous throttle response! Good riddance! Besides...Parts that don't exist don't cost much and they seldom break!
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90 #1202
"FBI" top end ported & relieved
Cam timing by "Pete the Greek"
Sans secondaries
Chip & dyno tuning by Haibeck Automotive
SW headers, X-pipe, MF muffs

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Old 05-25-2022   #15
96 coupe
 
Join Date: Oct 2018
Location: Branson, MO
Posts: 17
Default Re: Secondaries

1990 #254 still on and working great!
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Old 05-26-2022   #16
GOLDCYLON
 
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Join Date: May 2007
Location: Peoria, AZ
Posts: 9,152
Default Re: Secondaries

Removed
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GOLDCYLON - 91 ZR-1 #2014
GOLDCYLON - 90 ZR-1 #2794, 4L60e (Formerly Schrade's)

GOLDCYLON - 11 CTS-V


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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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Old 05-26-2022   #17
ZWILD1
 
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Location: Spring Grove ,Pa.
Posts: 251
Default Re: Secondaries

Marc deleted them on my 91 Z . Not complaining though . Don't miss them .
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Old 05-26-2022   #18
A26B
 
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Location: Arcadia,OK
Posts: 3,372
Default Re: Secondaries

Cool feature for a stock engine. Not much use for them after porting for a full boogie 416, so they are removed.
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JERRYS LT5 GASKETS & PARTS
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1994 ZR-1, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc.
2016 Black-Red, 3LT-Z51 Auto 8-speed.
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Old 06-02-2022   #19
XfireZ51
 
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,661
Default Re: Secondaries

Agree w Jerry and Paul. I never liked that split second hesitation built into the secondary port activation. Felt like turbo lag.
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Old 06-05-2022   #20
richarde
 
Join Date: Sep 2012
Location: United Kingdom
Posts: 68
Default Re: Secondaries

Both my 1990 ZR-1's have working secondaries, which I intend to retain. My black car has run 11.7 / 118 in the quarter after having the plenum and injector housings ported, but retains the functional secondaries.


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1990, numbers 1821 and 2391
1821 - owned since Nov 2002, charcoal / Gray, Stainless headers, B&B system, 4.10's
2391 - owned since Jan 2019, Black / Black, have completed restoration. Jeal headers, Corsa system, 4.10's, Aluminum flywheel with Carolina clutch.
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