SHO upper intake manifold opinions

[sspeedstreet]

If this manifold were mounted to the 3.4 DOHC with a custom LIM, do you think there would be an improvement in higher and lower RPM performance?

[gpchris]

It wouldn’t be worth all the work you'd have do to make it work.. And I doubt you gain any power and even if you did it wouldn’t be alot.

[RedZMonte]

that and you would have to say you need ford parts to make your car fast.....

[d.o.h.c]

true that

[series8217]

Probably not worth the work. It may be almost as much work as just modifying or building a new 3.4 DOHC upper intake manifold and using the RPM switched butterflies for a dual-length setup.
I recall someone on this forum making a diagram for how to easily modify the stock plenum with an RPM activated valve to change the runner length or plenum size.

[ez112]

DEFINATELY not worth the worth.

I own a SHO and a 3.4L, and I can tell you right now that torque would be out the window with that thing.

Plus I think something in the computer opens up the secondaries because I've heard of Tweecer modding to open the secondaries up a little earlier. I don't know how that would work with a GM connection??

[sspeedstreet]

DEFINITELY not worth the worth.

I think something in the computer opens up the secondaries because I've heard of Tweecer modding to open the secondaries up a little earlier. I don't know how that would work with a GM connection??

I was afraid the secondaries would be computer operated. Pretty much ends the exercise.

As for Ford parts, I don't limit myself to the bowtie. If it has potential, I'll look at it.

ez112, on what do you base the opinion of lost torque?

[93ztwo4]

they are yamaha parts anywyas

[ez112]

Well this reminds me of back when my friend had his 95 Z.

He had an upper plenum that was cut in half and the inside runners were bored out or elongated or what have you. Then it was welded back together leaving a cool looking bead across the top of it.

The end result of that intake rumored to leave you with a nice loss in torque but a gain fair gain in HP.

If it's because of more air/less restricted flow going in, then this intake would definitely provide that and more. Hell it would practically BE an SHO. All HP and no Torque.

That's just what I think. Our DOHC is just antsy for HP, and not too giving on the bottom end..

[z34phoenix]

its not worth the effort to get that intake to work on our cars.... it would be easyer to cut and modify a 96-97 upper intake to achive the dual runer system.

the benifit of the dual system comes from haveing the best of both worlds... short runers are great from top end HP and long runers give you TQ.

your best option would be to lenghten the factory runers on the stock intake... and add a set of secondaries that are very short. you would need to get a solonoide and an RPM activated switch to trigger the secondaries. a Vac operated switch is no good cause it would end up killing your low end TQ... cause the short runers would open early when you go WOT.

[john_V63400]

SHO's are nice I have a 89 take a look, all i have is intake... This is my honda killer when Im street Racing on the old air strip in the back country on Saturdays.

[nfswift]

What if someone developed a pre-95 (for the long runners) manifold with cutouts arranged for velocity stacks on a manual switch that can be used while racing?? It's a bit crude but couldn't it accomplish what we are trying to do here for top end? Fitting them to seperate ports and fabricating the butterflies would be the difficult part, but the nature of the stacks would allow them to be installed somewhat "outside" of the rest of the manny and would eliminate the need to merge it all into one piece wouldn't it? For people who want power on demand it might seem inconvenient but for racers who enjoy these types of performance mods I'm sure it could be worth it...

Thoughts?

[nfswift]

By the way very nice SHO John.

How's it feel compared to a DOHC 3.4??

[z34phoenix]

problem with that design is getting the sensors needed for fuel managment to work when the short runers kick in....

tuning will be the main thing to get it all to work. and yes getting butterflys at each runer would also be an issue that needs to be overcome. also the very modification of the intake manifold to use a second set of runers will effect air flow and mostlikely increase restriction in the original manifold.

[ez112]

Damn!! That's a nice 89! You need to get yourself a Y pipe!!

I really couldn't really compare the engine because one is a Manual and the other is an auto. But I think we have the edge in torque as scarey as that sounds. Top end...3.4's need to bow down. It's mainly a Super fun car because it handles so damn good too!