Adam, what am I going to have to make sure clears? The actually bodies will be pretty standard for jenvey and there will be a large sellection of trumpets available to choose.

What is worrying me is that I don't think this is too hard a mod but it seems on here to be hard. Just remove the standard intake, replace it with the jenvey kit, do a pedal convertion, sort out an air box (hardest bit IMO), install a stand alone and have it mapped.

 

the trumpets themselves....the problem is that while their manifold is a std piece, since their design places the trumps in a vertical fashion, you have to be concerned about the length of the trumpets...even more so if you look to enclose them in a box. But, as you adjust the length of the trumpet, you are also significantly affecting where the power/torque is made. This is one of those things I tried to ask about when I called them back in March, but they had no answer for me and basically said I'd be on my own. Certainly alot different of a scenario though if you are local to them and can have it all sorted in house

It's not a hard thing in theory, but in execution I think there will be some stubling blocks to overcome. Like anything, all depends on your budget, patience, etc.

 

Want to make sure you don't think I'm have a go Adam as im deffo not but I'm still unsure what the trumpets need to clear. What will be in their way? The strut brace may be an issue?

 

A bolt on turbo kit would be more drivable than itbs...

ITBS require a **** load more work than most assume, not to mention tuning is very finicky, and forget about it if you live in an environment where weather changes throughout the seasons.

 

strut brace is the least of the issues...the hood is your biggest limiting factor

 

weather changes have nothing to do with it...you use an air inlet temp sensor and map sensor, exactly like any turbo kit uses, and if properly tuned, no setup should need tuning based on seasons.

More driveable...can't see how anyone can make such a statement when no one has the ITB's on a street driven car yet. Like anything else, time will tell

 

Adam from this I thought you meant that hood clearance would be fine but understand now.

With regard to setting up itbs I've never had an issue with constantly having to tweek them and I've had them on 2 cars; a fully built motor and just a bolt on.

Carbs yes, constantly tweeking but itbs on an injection car no.

 

sorry I should have been more clear. An 07 hood will offer you more clearance but I don't think even it will give you the clearance needed to run the kit as shown in an enclosed box without dropping the engine down significantly. But this is of course just my best guess based on the pics I've seen of these kits on a variety of race Z's

 

Makes sense now Adam. I've ask my tuner to check trumpet lengths, air box and clearance. If he is willing to assure me they will fit under my bonnet and if they don't my car will be put back to standard at no charge then I think I'll go for it.

 

oh and I've spent a lot with this tuner in the past so have a good relationship with them.

 

good luck with it Colin - any questions, lmk

 

There's one thing I don't understand.

To me, the main attraction of these ITB's is that they look really cool. I mean nothing looks better that the first picture in this post.

BUT... If you have to put a big air box over them to get them to work, you can't see the ITB's any more. To me, that's game over. Maybe you could make a clear plastic air box, but I don't know... If I couldn't do it without an air box, I wouldn't do it. It would be different if it made 30 NA horsepower or something.

Am I missing something?

 

is needing a custom hood that big of a deal?

 

JB,

You sort of answered your own question. For you, its only aesthetically pleasing. If your only buying them for looks then I agree its not worth it, but then again that is my opinion.

Will it make 30 hp NA? I have no clue, but we will definitely know soon for sure. I do expect a car that converts over to ITBs do drive somewhat differently in a positive manner.

 

you could build a box with a clear section if you really wanted to see them...ala Alfa Romeo does. Power gains we'll have to see. Based purely on the research I've done so far, torque will get a good kick in the pants, and you you're taking in a significantly larger volume of air. Throttle response should also be improved too. WHP gains will vary by setup of course, so we'll just have to wait and see how it plays out.

Building an airbox is by no means easy - and it cuts down on the volume of air that the bodies can ingest as well. Plusses and minusses involved to running them open, or ducted, and closed. Alot of math involved in spec'ing out the exact "ideal" box, and then, you're again limited by space. I was quoted $5k to do a single box design, a bit more if it were in carbon. That would then give me rights to the mold as well...but only that singular design. Keep in mind this was only for the box, not for the bodies to go inside them

 

a bigger deal than not needing one I'd say

 

Once again it depends on who you ask, to some it will to others it won't.

The top secret cars that run ITBs have hood modifications I would NEVER make on my own personal car.

 

...or like Top Secret did...

 

getting ITB's because they look good = fail. i think there is a good chance that these will make a bunch of power, but 20 whp NA? really unlikely IMO. possibly somewhere in the midrange, but not the coveted peak #'s most people here care about. its not like the starting point is a 350 with a 2-barrel manifold. the stock manifol has semi velocity stacks that flow pretty well as it is. the big advantage to ITB's is the revability. for an 8000+ RPM setup like adam's, the gains over a STOCK intake manifold could be huge, probly not over whatever it is that he is working on though. it also is pretty dependent on how long/short you make the trumpets though