Removing Secondary Vacuum System questions.

[xxxscimitarxxx]

Thanks

will drop Haibeck a line

does the chip have a specific programme reference and how much is it?

To use the American venacular....''this is a no brainer''

lm driving mine, not going in for concours shows. I want simplicity and reliability....and this is a good move.

Any other suggestions for stuff to rip out that give you more grief than gogo?

Dave

[Paul Workman]

Originally Posted by xxxscimitarxxx

Thanks

will drop Haibeck a line

does the chip have a specific programme reference and how much is it?

To use the American venacular....''this is a no brainer''

lm driving mine, not going in for concours shows. I want simplicity and reliability....and this is a good move.

Any other suggestions for stuff to rip out that give you more grief than gogo?

Dave

There are a few options, depending on what all ya want. Mine was a "feature-rich" version tuned for an additional 50 hp coinciding with the top end porting.

As for your question re the two plenums (other post): Plenum design is a balancing act with volume, harmonic frequency, and air column velocity being the major factors - simply put as I can. Smaller engine displacement benefit from smaller runners, and bigger engine displacement need runners with more volume. However, if you mix the two, you can come out loosing instead of gaining. Put a big siamese plenum and IHs on a 350 ci and you could loose low end as well as high end performance. Put a stock plenum on a (stroked & sleeved) 441 motor and you'll choke it to death. It's all in the tuning, and books have been written on this very subject.

P.

[xxxscimitarxxx]

Thanks for the haibeck info.....lm guessing about $250......

and re the plenums, l was just curious.

I have had the question on my mind for some time since seeing one and was thinking that the siamesed runners were for a performance application

as for other plenum designs ....the one on DRM's web site with the downdraft ram pipes being an example of the dropped plenum

beautiful engineering indeed

[xxxscimitarxxx]

as lm going to be pulling a plenum or two this weekend lve got this secondary delete project in mind

But.....

1)If l delete all the secondary plumbing and tie wrap the secondary butterflies open without the prom being modded (haibeck).....what is the effect likely to be.....driveable or not

2)also as lve not ordered my plenum gaskets in time to get them shipped....if my plenum gaskets come off in OK condition.... is it OK to reuse them with a little jointing compound

I know its not the way ....but as you know my nearest parts stores are over 2000 miles away.

[John Boothby]

Order your gaskets from Jerry. He is very good at getting them out. Excellent service. Order the thicker gaskets that he offers and if you need to R/R the plenum again you should be able to reuse them, no sweat. Also, I reused my gaskets once, and they were perfect. Just be sure that they are in good shape and reuse them on the same side, don't flip them. I do not believe you need to use any sealant on them, I didn't. Torque the plenum screws according to the FSM (20 foot pounds) and in proper sequence.

[Pete]

Originally Posted by xxxscimitarxxx

1)If l delete all the secondary plumbing and tie wrap the secondary butterflies open without the prom being modded (haibeck).....what is the effect likely to be.....driveable or not

It will drive just fine maybe better,you will have to make sure power key is always on.

Originally Posted by xxxscimitaxxx

2)also as lve not ordered my plenum gaskets in time to get them shipped....if my plenum gaskets come off in OK condition.... is it OK to reuse them with a little jointing compound

That is also OK.

Pete

[xxxscimitarxxx]

Thanks guys

there are two reasons to own a ZR1....one of course is the car it self.....the other is the help you get from the people who own them in this registry

Thanks again......

[xxxscimitarxxx]

well l did the secondary actuator plumbing removal on my yellow92

and........

OMG what a difference......its like day and night

and considering its been running without operational secondaries since the day l had it (and l didnt know it) its like a different car......

also considering its got muffler deletes, and l discovered its running a fidanza flywheel and a modified prom

Jeeeeeeeeeeeeeeeezus

I was physically numbed by the difference.....l got out of the car after giving it some WOT feeling something l cant put into words

wouldnt have considered this job without the previous comments from you guys



Thanks

David

PS....now l have to work on something to keep the nose on the ground.....steering now feels way to light when l floor it....maybe too much squat

my red 90 also has secondary vac probs and driving it now clearly shows that the secondaries dont work......slowwwwwwwwwww

[Pete]

Originally Posted by xxxscimitarxxx

well l did the secondary actuator plumbing removal on my yellow92

and........

OMG what a difference......its like day and night

and considering its been running without operational secondaries since the day l had it (and l didnt know it) its like a different car......

also considering its got muffler deletes, and l discovered its running a fidanza flywheel and a modified prom

Jeeeeeeeeeeeeeeeezus

I was physically numbed by the difference.....l got out of the car after giving it some WOT feeling something l cant put into words

wouldnt have considered this job without the previous comments from you guys



Thanks

David

PS....now l have to work on something to keep the nose on the ground.....steering now feels way to light when l floor it....maybe too much squat

my red 90 also has secondary vac probs and driving it now clearly shows that the secondaries dont work......slowwwwwwwwwww

Can you tell us how much low end power you lost and how many times your car backfired and how badly it chugs in traffic.

Some like having the power key,for those that really don't care for it and don't wanna pay big dollar parts,this is the way to go.


Pete

[xxxscimitarxxx]

seemingly l have gained in all areas.......low end was like a rocket.....and no chugging....and l never drive with power key off

why should it have have been as bad as you suggest if all the previous comments said l would never miss it