Secondary Throttle Removal

[bobbyhi]

I'm bringing my '90 down to Marc's on the 23rd of April and leaving it for a week for some minor things. I have been toying with the idea of removing the secondarys. Good idea?? Bad idea?? What say you guys?????? :icon_scra

[Pete]

You'll notice it'll pull/drive away from a stop nicer.

No more looking for vacuum leaks,actuators,solonoids,pump,vacuum lines,ect.

Pete

[ZR1@gmx.com]

I'm bringing my '90 down to Marc's on the 23rd of April and leaving it for a week for some minor things. I have been toying with the idea of removing the secondarys. Good idea?? Bad idea?? What say you guys?????? :icon_scra

I removed mine and I am glad I did! It is a new engine so it runs much better and can not tell if it is because of the secondary removal or not... nice not to have to worry about all that stuff working and not leaking!
Love it!

[-=Jeff=-]

Bob,

is it a drop and run? are you driving or flying back?

April 23rd is a Sat.. Wanna meet some of the FBI Boys then or on the pick-up trip or BOTH?

[Paul Workman]

I'm bringing my '90 down to Marc's on the 23rd of April and leaving it for a week for some minor things. I have been toying with the idea of removing the secondarys. Good idea?? Bad idea?? What say you guys?????? :icon_scra

I've got nothing but good to say about removing mine. I have Marc's chip in mine, also dolled up with fan temp control, modified idle, and some other stuff. It runs soooo sweat (ask him when you see him).

That's why I was a little bit shocked when Marc's recommendation, given at his talk at the ZR-1 gathering in BG last year, was to leave the secondaries in. He described how and when the secondaries open, and how to manipulate them while drag racing and cruising. But, in my experience it is more responsive and the over all driveability is sooo nice, not to mention not having to ever worry about the overly complicated system crapping out ever again, that it made me shake my head in disbelief when he said that... :dontknow:

Parts not used don't fail and they don't cost much to fix!

http://i185.photobucket.com/albums/x220/6PPC_bucket/tech%20files/ZR-1009.jpg

Anywayz...When you come down, and if you have the time, we'll have an FBI pizza GTG, drink some brewskies and tell some lies!

P.

[GOLDCYLON]

It would be great is somebody has written a step by step on how to do this. Im surprised the SES light dosent come on with everything removed. GC

[ZR1@gmx.com]

It would be great is somebody has written a step by step on how to do this. Im surprised the SES light dosent come on with everything removed. GC

I can write that and document it with photos... Probably be a week before I can get to it. It is fairly easy, I made a small tool that helped.

Mark H programed a chip for that and several other mods, I think that may be a requirement.

[bobbyhi]

FBI boys - I will be at Marc's on Saturday April 16th. He opens at 10:30AM. My flight back leaves Midway at 2:58 PM. I come back the next Saturday the 23rd arriving at Midway at 8:30AM. Would be great to get together one day or both days. Always happy to meet fellow ZR-1ers. I'm not sure how far Marc is from Midway but the taxi would have to pick me up a couple of hours before flight time for the 16th. The only fly in the ointment is that I might have a co-pilot:-D.......

[-=Jeff=-]

FBI boys - I will be at Marc's on Saturday April 16th. He opens at 10:30AM. My flight back leaves Midway at 2:58 PM. I come back the next Saturday the 23rd arriving at Midway at 8:30AM. Would be great to get together one day or both days. Always happy to meet fellow ZR-1ers. I'm not sure how far Marc is from Midway but the taxi would have to pick me up a couple of hours before flight time for the 16th. The only fly in the ointment is that I might have a co-pilot:-D.......

Taxi will be a bit of $$ to go to midway

I think on the return trip \it would be a bit better as you would not be time limited..

[bobbyhi]

Sounds good to me. April 23rd. Plane arrives 8:30AM. Marc opens at 10:30AM. Gives me taxi time to Marc's. Meet at Marc's?? Or wherever you guys like...........We have plenty of time..........

[Paul Workman]

It would be great is somebody has written a step by step on how to do this. Im surprised the SES light dosent come on with everything removed. GC

Ah! It would, 'cept the ECM is re-programmed to accept zero vacuum as being OK, and the vacuum sensor, tho open now to the atmosphere, remains electrically connected (so the ECM knows it's there). So, having the chip modified is part of the gig.

When I had my chip re-programmed, it was part of a top end P&P and I opted to have the cooling fans & the idle characteristics (among some other features) included in the cal.

FYI, at idle, Marc's "no secondary throttle plates" calibration has the secondary injectors turned off. At 1 degree of throttle and above, the secondaries join the primaries and hello throttle response!

Pete is a "two-finger" typer, so he's skilled at packing it all in so few words. Gotta love 'im.

You'll notice it'll pull/drive away from a stop nicer.

No more looking for vacuum leaks,actuators,solonoids,pump,vacuum lines,ect.

Pete




Although this pic was taken to document a problem with a gasket, one can see the hole left by the secondary throttle shaft in the secondary port. (And, one can see how the bosses have been "modified" around the injectors (1990 LT5), but that is another topic.)

http://i185.photobucket.com/albums/x220/6PPC_bucket/tech%20files/ZR-1007.jpg

P.