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#1 |
Join Date: Mar 2020
Location: Pensacola Florida
Posts: 22
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So I pulled my plenum to fix a vacuum leak. It’s leaking at the plenum gasket the guy I bought the car from replaced the injectors and the alternator. But obviously he did not have a Plenum gasket because I found sealant on the left side towards the back probably tore the gasket when he removed it and just put some sealant which did not work. Now this guy had purchased the car at auction and I purchased it from him but I track down the owner before him to get some history on the car found out he had zip tied the Secondaries open and had a chip bar to run them all the time. From Marc haibeck. But when I remove the Plenum they were not zip tied back so the guy I purchased a car from who replaced the injectors Either remove the zip ties so I’ve been running with the secondaries closed this whole time. But with the chip running the injectors as if they were open the car felt pretty powerful. So how much more power can I expect with the secondaries nail tied open? I am hoping for a big difference
Thanks. Greg |
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#2 |
![]() Join Date: Dec 2007
Location: NYC
Posts: 1,186
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If the flaps are closed you are probably running very rich when the secondaries are not functioning you are probably about 230 HP
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90 Chevy ZR1 LPE #2315 'SOLD' 90 Chevy ZR1 LPE #2774 'SOLD' 91 Chevy ZR1 Callaway aerobody 91 Chevy ZR1 #1512 91 Chevy ZR1 #951 95 Chevy ZR1 #338 'SOLD' 91 BMW 850i 94 BMW 850csi 95 BMW 850csi 94 Lotus Esprit S4 07 Benz CLS550 06 BMW M5 "SOLD" |
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#3 |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,697
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IF the secondary actuators are operational, then they would open at the point that Marc set it in the calibration (along w the secondary injectors) which would likely be right after TPS% >idle which is about 1.95% stock. That assumes he used 0s for TPS% v RPM in the the secondary throttle opening and closing tables. Pretty sure that's what Marc does.
Is your Secondary Differential MAP sensor still connected?
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[SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX |
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#4 |
Join Date: Mar 2020
Location: Pensacola Florida
Posts: 22
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They where supposed to be zipp tied open that’s how He had the tune to delete secondary butterflies The previous owner said he had him zip tied back but the guy that acquired it from him Must have Removed the zip ties the secondary injectors are operating just off idle as you say but the butterflies were never opening a vacuum tested it I have now wired them open
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#5 |
![]() Join Date: Nov 2011
Location: Dunbarton NH
Posts: 7,375
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I would make absolutely sure the car is programmed to run without them. If it's not, and you tie them open, it will run extrodinarily lean. Lean is bad.
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#6 |
![]() Join Date: Sep 2016
Location: Ocala, FL
Posts: 889
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OP you need to contact Ted Dempsey to get this sorted out. He lives up in the panhandle near you. PM me if interested and I will share his number with you. Yes lean is bad, very bad.
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Steve Young 1991 ZR-1 Quasar Blue Metallic/Black #729 Second Owner 1991 ZR-1 Dark Red Metallic/Black #2040 SOLD 1990 ZR-1 Dark Red Metallic/Saddle #1670 SOLD Double your happiness.....complain half as much. |
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#7 |
Join Date: Mar 2020
Location: Pensacola Florida
Posts: 22
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Im sure it’s programmed to run with the secondaries open I spoke to Marc shortly after getting the car after the previous owner informed me about the drm chip he had reprogrammed by Marc. I have it all back together. I have a teck 1 scanner the secondary injectors come on right off idle.
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#8 |
![]() Join Date: Jun 2006
Location: Sparks, NV
Posts: 2,852
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You need to verify whether the secondary throttle plates are opening or not. The PO may have fixed the throttle plates and secondary system and didn’t know the Haibeck secondary delete chip was in there. Here how to check it without taking the plenum off. If you find they are opening you have the option of reverting to a normal chip and not having to take the plenum off again. If their not working you will have to remove the plenum and wire them open or fix them and install a normal chip.
H ![]() http://www.zr1specialist.com/HAT%20W...0Operation.pdf
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90'ZR-1 #1461 Red/Black Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold 08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold 05 C6 Z51 Red/Black Sold 90'ZR-1 #1723 Black/Gray Sold but not forgotten 91' Z51 L98 White Vert. My First, you always remember your first. Sold. |
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#9 |
Join Date: Mar 2020
Location: Pensacola Florida
Posts: 22
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I have them wired open
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