New Owner---1990 Black LPE 368 475hp zr-1 43k miles #699 ---

[alwayscode390]

Does it seem like I have nothing to worry about? The car runs strong , just dyno'd it the other day (good a/f ratios) ... and it feels solid while driving it. No weird noises while rolling down the road, its just while at idle ---

[ZZZZZR1]

I agree with the single flywheel theory (thought you knew you had a dual mass flywheel).

I think they used Mcleod and or a special lightweight flywheel.

My car @ idle isn't too bad, but I have a sprung hub clutch (catches the rattle pretty good)

David

[alwayscode390]

I just went through the paperwork ... no flywheel paperwork.

16 new Bosch ZR1 primary/secondary injectors purchased in 2007.

The previous owner told me I had a dual mass ... hence the sound I was hearing , he may have been confused. Is there a way to notice when the car is up in the air and you are looking at it? I can try to snap pics when I get the wheels installed in a week.

What is actually making the clunk, are these engines not balanced? ---

[ZZZZZR1]

Bosch injectors are likely rebuilt injectors and have issues. We have seen numerous failures and that could be a cause.

I'm hoping you have a single mass flywheel!



David

[alwayscode390]

The Bosh injectors say "BRAND NEW" next to the order ... he paid $672.50 for them!!!

Also bought an AC Delco fuel injector pressure regulator for $120 and PCV valves at the same time.

So, Im guessing ... its not supposed to hesitate at 3500rpm when you are babying the throttle? I could have sworn that was just because the secondaries were about to open and its dumping more fuel in there ... but I get off the throttle too soon for a shift? Is the secondary engagement supposed to be smooth? Its not throwing any codes ---

[alwayscode390]

Here is my recent dyno from a few days ago. SMOOTH torque/horsepower curve ... expected power output even with a fubar center resonator.

Shouldn't be producing enough sound to show up as knock on the computer right?

I drove her today, and NO sound. Seems to happen after I drive it ... park it about an hour , then restart it. I had my vid camera and everything waiting for it to happen. I will get a vid soon enough.

Let me know if everything seems reasonable. Thanks ---

[efnfast]

Air to fuel looks a little high. From my experiance, which is very limited, I would expect to see peak hp around 6800.

[alwayscode390]

With this being a ported / tuned engine, Im pretty sure it could be a little off from a stock Dyno.

My tuner said it IS a little lean, but its still in the safe zone ... he was impressed with it being an OBD1 car that it was running so well.

Thanks for the input ---

[alwayscode390]

I called Lingenfelter Performance earlier today. They dug deep in the records and verified the work done to my ZR-1. He said it has some history , and will send me all the paperwork ... with 2 Polished Aluminum LINGENFELTER badges for the fenders. They REALLY keep those on lockdown. They had me verify the car was in my possession in multiple ways before even considering selling me one, then dug deep in their 1993 files ( they told me before they only had records back to 95' ) to verify the car was actually worked on by them, and didn't just have a Lingenfelter kit installed. It took the 5th person I contacted to actually have the pull to do this.

I really just took the previous owners word on it, considering the throttle body tube was the only thing with Lingenfelter on it. The paperwork he gave me was in POOR shape, it was a copy that was crooked, faded, and without Lingenfelter written on it anywhere. Im STOKED!!!

Now to get the wheels installed later this week after waiting on some custom front hub-centric spacers to come in ... then I will post some pics.

I have some questions on the injectors that came with the purchase on the car, I want to make sure they are stock and used ... starting to wonder if I have new injectors in a bag that need to be installed. I will take pics of them and post up later. I found the fuel pressure regulator ... new, uninstalled that I previously thought was installed with the injectors . This may answer the stutter problem I have been having ---

[WB9MCW]

Looks like you are on the right trail now.

Congrats on the Badge(s) coming to you very nice.

How would you compare/contrast your Viper with the Z?
What do you like about the one vs the other?