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If someone was driving an 8k mile 91 across flats of Idaho to Tennessee, hypothetically what kind of time and distance would it take to go from 120-170 mph - obviously on a private course?
I heard of a fellow with a clean gas tank and fuel filters and all the injectors ohm tested good (but maybe not cleaned) who once ran 4th up to 130 or so and 5th to 144 but the last fifteen miles per hour or so ticked off less than one per second.
i am a longtime member on the c1/c2 forum and do track days with my 64. Thank you guys!
If someone was driving an 8k mile 91 across flats of Idaho to Tennessee, hypothetically what kind of time and distance would it take to go from 120-170 mph - obviously on a private course?
I heard of a fellow with a clean gas tank and fuel filters and all the injectors ohm tested good (but maybe not cleaned) who once ran 4th up to 130 or so and 5th to 144 but the last fifteen miles per hour or so ticked off less than one per second.
i am a longtime member on the c1/c2 forum and do track days with my 64. Thank you guys!
benton
ps- I hear the car looks vaguely like this
If that the case there was something wrong. I ran 150 in a standing mile at an airport runway. If I recall correctly at 150 I was still in 4th and still accelerating nicely. That was with a basically stock 90’. And yes, it does look vaguely like that...
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For what it's worth, I ran 144+ in a standing 1/2 mile on a airport runway (Chicago area WANNAGOFAST event) in 4th gear.and it was accelerating smartly still. Stock 3.45 diff.
Thanks Paul! The evidence is building. I was reading a pdf online earlier in thebcar that suggests these two gents have the flywheel ticking when warm symptomatic of needing injectors on the primary side. The secondary side was tested and changed by a deal and NO check of the primary. At least “that’s what I hear.”
looks like going with accel all around (including the secondaries)
Thanks Paul! The evidence is building. I was reading a pdf online earlier in thebcar that suggests these two gents have the flywheel ticking when warm symptomatic of needing injectors on the primary side. The secondary side was tested and changed by a deal and NO check of the primary. At least “that’s what I hear.”
looks like going with accel all around (including the secondaries)
I've been using the Accel 150821s (x16) from Summit Racing since 2011(??) with NO problems or noise from my Fidanza aluminum FW in combo with a sprung hub disk.
I've been using the Accel 150821s (x16) from Summit Racing since 2011(??) with NO problems or noise from my Fidanza aluminum FW in combo with a sprung hub disk.
I’ve read a few articles from zr1specialist on the accel 150821’s and they are my move next for my buddy. The flywheel is knocking at idle which I’m told will resolve.
The car just completed a cross-country trek averaging about 18.5 mpg and after two bottles of Techron revved a little better by day 4.
The car had three new injectors before the trip- dealer felt it need a “secondary” tuneup. Car has 8k miles with only 1k added from 95 to this week. My friends late father was the original owner.
Baffled the specialty dealer didn’t bother to check the primary injectors resistance when there were three dead secondaries. Particularly at $110 an hour.
No, on second thought I’m not baffled.
Anyway- I have read I can test the primary injectors remotely before pulling the upper plenum which I’ll do this week. I’m betting I have several bad and I’ll retrofit the entire 16 with fresh accel- after test. I know I’ll need some gaskets.
I’ve read a few articles from zr1specialist on the accel 150821’s and they are my move next for my buddy. The flywheel is knocking at idle which I’m told will resolve.
The car just completed a cross-country trek averaging about 18.5 mpg and after two bottles of Techron revved a little better by day 4.
The car had three new injectors before the trip- dealer felt it need a “secondary” tuneup. Car has 8k miles with only 1k added from 95 to this week. My friends late father was the original owner.
Baffled the specialty dealer didn’t bother to check the primary injectors resistance when there were three dead secondaries. Particularly at $110 an hour.
No, on second thought I’m not baffled.
Anyway- I have read I can test the primary injectors remotely before pulling the upper plenum which I’ll do this week. I’m betting I have several bad and I’ll retrofit the entire 16 with fresh accel- after test. I know I’ll need some gaskets.
In all at least the 2,800 mile trip was glorious!
There IS a procedure for measuring injector resistance w/o removing the plenum. I've got to run right now, but if nobody chimes in before I get back, I'll try to look it up (got pix too). (I'm packing for the Rocky Mountain Run - leaving tomorrow AM and haven't begun to pack yet.)
That said, if you've already experienced some bad injectors, then it is only a matter of time before the rest will fail. I'd suggest replacing them NOW as in addition to running rough, burning a valve due to lean condition is a distinct possibility (IMO).
And, far as your dealer goes, I've had some bad experiences EVERY TIME I let a dealer touch my car: F'ed it up BOTH times. (Secondary tune-up? ) Lots of talent on this (and the ZR-1 Net Registry club's) FORUM especially! Point is, even if your not familiar with the LT5, the basics are easily mastered with the help here on the ZR-1 FORUMs. With dang few exceptions, taking you Z to some dealer who chances are has never seen an LT5 before, is really like playing Russian Roulette...only with 4 bullets in the revolver!!
So - as mentioned above - test all your injectors as per the link above and/or the service manual - please note - early model Z's have issues with ethanol causing failure of fuel injectors - so if they are OEM, source some RC Engineering units and replace them all. Good luck!
So - as mentioned above - test all your injectors as per the link above and/or the service manual
FSM pic Everyone knows you don't need a FSM for these cars. Just tinker around those ECM connectors for a while- your bound to get some sort of reading that means something, if only there was a codex of knowledge that had detailed diagrams of all the circuits, it could make things easier for us rookies.
FSM pic Everyone knows you don't need a FSM for these cars. Just tinker around those ECM connectors for a while- your bound to get some sort of reading that means something, if only there was a codex of knowledge that had detailed diagrams of all the circuits, it could make things easier for us rookies.
Funny thing - every year of the ZR-1 has a separate service manual due to the running changes that GM made with each successive MY. Wiring changes is one of the biggest areas of those changes. One might go so far as to say that if you want to work on all the years of ZR-1s you'd have to own 6 service manuals! Crazy talk, right?
I suppose one could just fool around and see what happens - but it might be seen as somewhat.........silly!
But what do I know?
Aaron - you should post up copies of the service manual for those too lazy or cheap to buy one! It's only copyrighted material owned by GM! I'm sure GM won't mind!
"Aaron - you should post up copies of the service manual for those too lazy or cheap to buy one! It's only copyrighted material owned by GM! I'm sure GM won't mind!"
They did not mind defaulting on their bonds and screwing every shareholder of their stock. They owe us
I’m sorry I missed so many good replies! I got so many notifications from the cf on email I turned off notifications since I’m always on the c2 forum. My apologies.
I have a full set of accel injectors but it will be a week before I can swap them. I’ll report back. I did follow the zr1 specialist remote primary injectors test and as I felt driving it she still is way down on power- I can wait to drive her after i fix!
thank you! It now belongs to a great friend i wrench with/for. His dad bought it new, put 7k on it, sold it and it sat through several owners and got only 1k for the other 24 years or so of it’s life. We put 2,800 odd miles on coming home!
I’m hunting for one! The engine sound is intoxicating!
a few photos-
Last edited by ChattanoogaJSB; 07-20-2018 at 09:44 AM.
07-07-2018, 04:41 PM
Speed building above 120?
) Lots of talent on this (and the ZR-1 Net Registry club's) FORUM especially! Point is, even if your not familiar with the LT5, the basics are easily mastered with the help here on the ZR-1 FORUMs. With dang few exceptions, taking you Z to some dealer who chances are has never seen an LT5 before, is really like playing Russian Roulette...only with 4 bullets in the revolver!!
But than I've never been over 70
