1989 ZR-1 Pilot #004 Thread - Page 46 - ZR-1 Net Registry Forums

tccrab · 04-08-2010

Quote:

Originally Posted by 1989ZR1#74

Your both right. The vacuum pump is missing and it appears that it never had one. So where does the vacuum to drive the secondaries come from?

In Heart of the Beast is says that the vacuum pump was added to supplement the engines vacuum when the engine was run at high rpms for extended periods of time.

TomC
'Crabs

1989ZR1#74 · 04-08-2010

Quote:

Originally Posted by tccrab

In Heart of the Beast is says that the vacuum pump was added to supplement the engines vacuum when the engine was run at high rpms for extended periods of time.

TomC
'Crabs

Thanks Tom. I guess that happened before #074 and after #004..

1989ZR1#74 · 04-08-2010

Well #074's ECM seems to have cured the dash problem:

Now should I try to start it???

Corvettes White · 04-08-2010

Quote:

Originally Posted by 1989ZR1#74

Well #074's ECM seems to have cured the dash problem:

Now should I try to start it???

YES!

PhillipsLT5 · 04-08-2010

Looking Good

Blue Flame Restorations · 04-08-2010

Start that thing!!!!!!!!!!!!!!!!!!!!

Tyler Townsley · 04-08-2010

Quote:

Originally Posted by 1989ZR1#74

Well #074's ECM seems to have cured the dash problem:

Now should I try to start it???

In the future you may need a 88-89 ecm if you want to run it past the 154 deg warmup peroid, either that or hard wire (or make sure it is controlled by the oil pressure) in the primary fuel pump. In a 90 and later once the motor gets warm it shuts off the secondary pump and the ecm controls the primary pump shuting it off when it sees no rpm. Again the tach signal and dis out lines are different between the 88-89 and 90s so if that was a 90+ in the car and it was wired as an 89 it may have fried the ecm.

Tyler

Tyler Townsley · 04-08-2010

Quote:

Originally Posted by 1989ZR1#74

Well #074's ECM seems to have cured the dash problem:

Now should I try to start it???

-=Jeff=- · 04-08-2010

I agree with Tyler, test it before you actual light it up

1989ZR1#74 · 04-09-2010

Tyler, I ran a probe camera under the plenum and found a sticker on the DIS. It is a Motorola Enginnering unit, so I would guess it's not a 90+:

While checking the wiring for the gauges I see that someone has wired the fuel pump differently. The fuel pump does turn on and presurize the rails. I found that out after I swapped the sending unit. I am tempted to turn it over, but will wait a little while longer...

04-08-2010	#453
1989ZR1#74 Join Date: Jan 2009 Location: Scottsdale, AZ Posts: 700	Re: 1989 ZR-1 Pilot #004 Thread Well #074's ECM seems to have cured the dash problem: Now should I try to start it??? __________________ 1989 ZR-1 #04 Pilot, Advertising/PR Campbell-Ewald S9YKH1 1989 ZR-1 #58 LT5 only 1989 ZR-1 #74 Unreleased Production / PR Dept 9PR110 NCRS #3,182 SACC #2,420 Member Corvette Museum Corvette Forum: "ewjxn" 2009, 2010 Gathering Attendee

04-08-2010	#455
PhillipsLT5 Join Date: Aug 2005 Location: Scottsdale, AZ Posts: 2,451	Re: 1989 ZR-1 Pilot #004 Thread Looking Good

04-08-2010	#456
Blue Flame Restorations Join Date: Feb 2010 Location: Pendleton, IN Posts: 3,904	Re: 1989 ZR-1 Pilot #004 Thread Start that thing!!!!!!!!!!!!!!!!!!!! __________________ 1988 KOH Prototype EX5023 sold 1990 ZR-1 #444 Convertible 1990 ZR-1 Black #966 1991 ZR-1 Quazar Blue #296 1957 Duntov SS Project

04-08-2010	#459
-=Jeff=- Join Date: Jul 2007 Location: Bartlett, IL Posts: 7,157	Re: 1989 ZR-1 Pilot #004 Thread I agree with Tyler, test it before you actual light it up __________________ 1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978

04-09-2010	#460
1989ZR1#74 Join Date: Jan 2009 Location: Scottsdale, AZ Posts: 700	Re: 1989 ZR-1 Pilot #004 Thread Tyler, I ran a probe camera under the plenum and found a sticker on the DIS. It is a Motorola Enginnering unit, so I would guess it's not a 90+: While checking the wiring for the gauges I see that someone has wired the fuel pump differently. The fuel pump does turn on and presurize the rails. I found that out after I swapped the sending unit. I am tempted to turn it over, but will wait a little while longer... __________________ 1989 ZR-1 #04 Pilot, Advertising/PR Campbell-Ewald S9YKH1 1989 ZR-1 #58 LT5 only 1989 ZR-1 #74 Unreleased Production / PR Dept 9PR110 NCRS #3,182 SACC #2,420 Member Corvette Museum Corvette Forum: "ewjxn" 2009, 2010 Gathering Attendee