Top speed in 1ST gear for stock Z?

[Mystic ZR-1]

See Ronstar post above.
Makes no difference, even if it takes a week to get there.
2nd gear's my favorite ~0 to 85ish w/o shifting!!!

[rush91]

Originally Posted by Paul Workman

Just a "SWAG", and I hate doing that as a rule, BUT those symptoms (runs out of steam at 5000 rpm) are classic "NO SECONDARIES" scenario, OR the accordion hose between the air filter box and the plenum is collapsing (which is what mine was doing when I had that exact problem).

Do you have the stock hose? If so, Marc can provide you with some hoops to insert in there to keep it from collapsing. Easy fix (if that is the issue).

And, if the hose isn't collapsing, then there's fuel pressure and Secondary Port Throttles (SPT) operation to verify.

You're in FBI country, so some of the best gurus of the ZR-1 are not far away! But, the "group" mainly resides in the Chicagoland area. But, IIRC, you're near Marion, IL, yes?

If so, and you want to drive up to Custer Park, I've got everything on hand to trouble shoot/assess the situation and either fix it or at least put you in the right direction.

PM me and we can hook up.

BTW, what year is your ZR-1?

Paul.

P.S:

If you can fashion a metal sleeve to fit inside that accordion hose, it might solve your problem and save you the trip... Just sayin.

My Z is a 1991, about 49,000 miles on her. I have wondered about the air duct for sometime now. It's original, and it could be collasping under load. And for $30 bucks I think, Marc's solution is nice. So are those silicone ducts Jerry has for sale, very nice......

And I live in Carterville, which is about 10 minutes from Marion. I keep my Z in Marion, which is 30 seconds from interstate 57 lol. I will take you up on that offer!! I'd love to truly trouble shoot this car. I do wish I lived closer to FBI land, I'm about 5 hours from Chicago.

Sent from my XT1585 using ZR-1 Net Registry mobile app

[ssrszz4]

I believe what causes the bellows to start collapsing is a plugged air filter. Once they start collapsing they of course weaken and it just gets worse.

Sent from my XT1585 using ZR-1 Net Registry mobile app

[efnfast]

RPM and speed are all mechanical. Power doesn't factor into it. Tach not reading right or gears have been changed.

[XfireZ51]

If u can datalog, u can read correct RPM directly from ECM.

[Paul Workman]

Originally Posted by rush91

My Z is a 1991, about 49,000 miles on her. I have wondered about the air duct for sometime now. It's original, and it could be collasping under load. And for $30 bucks I think, Marc's solution is nice. So are those silicone ducts Jerry has for sale, very nice......

And I live in Carterville, which is about 10 minutes from Marion. I keep my Z in Marion, which is 30 seconds from interstate 57 lol. I will take you up on that offer!! I'd love to truly trouble shoot this car. I do wish I lived closer to FBI land, I'm about 5 hours from Chicago.

Sent from my XT1585 using ZR-1 Net Registry mobile app

I'm "south of I-80", east of Kankakee about 20 miles; a little bit over 4 hrs (is all). Given some notice and we could see who we could entice from Chicagoland to join us too!

It might be a good idea to nab a plenum gasket set too ahead of time - just in case. We can assess what next steps need to be/ parts needed etc, and go from there. And, we can feed you a fine meal too, time permitting!