Re: If/When you go to siamesed Intakes?
 

all hail the almighty ported IH. I'm having a 2010 space odyssey flash back the way the light is reflecting off those beautiful ports

who is doing the "mono runner/siamese" work now and how much would it cost? I'm thinking of putting my current plenum "up on the wall" to save the sigs and getting the engine repainted. Like to try and see if these injector housings and a mono runner would pick up some top end

I am however worried about low end torq. with the big cams and light flywheel the LSV feels a little soggy until you kick it just a bit and then all hell breaks loose. even though the light flywheel is great for power and revs, it's not so great for launching the car. the heavier flywheel "dumps the intertia" and gets the car moving

I find I need to rev the car a bit more than with a stock zr1 for sure and even with the 4.10 gears it's not quite as "punchy" as I'd like on the hit until I get to 2k revs and then all is forgiven

good news is that it's got enough torq to let the clutch out at idle and not stall the car!

like to hear more about this intake mod. for sure it looks very sexy and has good potential up top. that's where the lsv lives anyway 6k and up!!

Re: If/When you go to siamesed Intakes?
 

Yep that will do it.

Re: If/When you go to siamesed Intakes?
 

Not a problem. just a few minutes work

1. raise the idle to about 2 grand (for better idle roll-out)
2. throw on a set of 10" slicks
3. launch at about 5K

Presto change!! no more "soggy" feeling.;)

I think what you REALLY want, is the angelic TT feeling...... smooth & docile grocery getter with the devil himself hiding below the loud pedal where all you have to do is step on his tail.

Re: If/When you go to siamesed Intakes?
 

Boost is the key to your ills...

Re: If/When you go to siamesed Intakes?
 

yes indeed, you guys know me too well. I'm a boost junkie and the TT ZR-1 is the holy grail.

sooooo........ how is that megasquirt project coming anyway? like to hear more about corey's progress on the raptor builds

a nice 800 at the tire is about all I need. smooth idle, endless torque that pulls to 7500 will work just fine

and shucks, I'll go back to a dual mass to kill the rattle.

the megsquirt is the key. I was surfing the DIYTune site the other day and noticed the nice 8 channel EGT box so we can tune each cyl

nice!! wondering if I can adapt that to my haltech ecm on the TT Z06 as it's quite a bit cheaper than the two 4 channel egt boxes and probes (1500!!!) from haltech. my bet is that it would work just fine and plug and play!!

here's my wish list for santa. some stretched liners, grooves in the heads, 93 cams (don't need my big stg II thumpers, let someone else have them) 16 60 lb injectors, a pair of walbro 340 pumps, the megasquirt, raptor TT, some fresh pistons, carillo rods (someone can have my TI rods), and yes, maybe a mono runner (looks cool)

stir in a good corey tune, and VI OOOOLA !!! TT ZR-1

stir in a roll bar (DRM), bikini top (have that already it folds up so you can put it in back), R&D Brace for top out crooze (have it)

and a ram 9" dual disk for grins. probably go back to a 3.45 gear at that point as well, someone can swap me for my 4.10 rear.

this is all doable, just need the PILE O CASH that will be needed to freshen up the old gal.

meanwhile, I'll keep trying to wear out the soggy ol LSV :salute:

Re: If/When you go to siamesed Intakes?
 

Could this be because there's still a bottleneck in the intake flow, with even with siamse-ed tubes?

WHich might be creating impedance in intake flow at mid throttle? And which is 'overcome' at WOT?

:confused:

Re: If/When you go to siamesed Intakes?
 

Hmmmm
Siamese vs Nicely Ported

Here are some thoughts.

Today we have big inch Z's with smaller cams no siamese intakes that run good 1/4 ET's/MPH.

Technology/performance has gone beyond Siamese intake, today we go just as fast with less.
Siamese/droped plenum does not hurt performance it does give you reserve air.

Tested Hogan's Intake (for sale) gained power raised peak RPM.
Hogan's comes with all lines,pressure regulator/gauge plug n play.

I would consider cost to gain.
Pete

Re: If/When you go to siamesed Intakes?
 

flow velocity is a very important factor. really big ports can hurt that and while they work ok upstairs, not so great getting rolling and hampering the overall area under the torq curve is not a good approach for a street car. you want that torque curve to be wide and meaty rather than "peaky" like a race car.

the LSV has the "state of the art" bifurcation ported plenum that was heavily ported and the "best at the time" but clearly the heads aren't ported that well, and no fancy drop plenum ect... it's and old school build and not that impressive relative to Pete's work with top end porting and cams relative to displacement.

as pete is saying "today we can do more, we have the technology"

and pete proves it every day by pulling 129 with a stock block which is as good as I can do with a 390 and the "full boogie LPE" package

key is in the endless hours of experimentation, tuning and optimizing the overall combination. Pete you are the man!

like to see that hogans intake!

kirchoffer spent a TON on his fancy fabbed intake on wild jeal cams and 421 build only to discover the design didn't seem to help much. I remember seeing it in BG and like Ron H said the "top plate" would flex up and down as he would rev it

he only got to run the car a few times and eventually blew a freeze plug out of the back of the motor

but overall there didn't seem to be a huge gain.

I've always wondered what the LT5 would do with an individual runner crab style harrop slide throttle intake. it would clearly be soggy down low, but flow like gang busters up top. ahhh.... it's good to dream and experiment, now I just need that 14th mortgage ;)

Re: If/When you go to siamesed Intakes?
 

Ron,this is the only picture I can find.
This top plate does not flex.

Pete

Re: If/When you go to siamesed Intakes?
 

Who asked you.;)

Back when this was done, it was the question of the day. Go BIG or High Tech porting.
Both mine and Todd's were at GVD at the same time. Same bench flow machine.

Todd's twin holes out flowed the mono ( Siamese ) bottom line. It was very close together at my SGC II cams lift, but on higher lift where Todd was going..... I got my azz handed to me. If I had to do over, find the guy who is making the power you want and go with their package. The Siamese looks cool ( my taste ) but was VERY pricey $$$

Re: If/When you go to siamesed Intakes?
 

Do we really even require siamesed ports anymore? Just going by tpepmeie's high output427, 638 rwhp(on chassis dyno) and 702hp at the crank 700hp from 6500-7000rpm & 588lb/ft torque(engine dyno) while running short of injector.

Re: If/When you go to siamesed Intakes?
 

Thank God!!!!! I knew this siamesing was $$$$$. I'll just get it dynoed, figure out any bugs & if it's not up to snuff, I'll go see my buddy Pete!

Re: If/When you go to siamesed Intakes?
 

like to try that with a 1300 cfm oval mono blade throttle body

I think the stroker "starves" for air running off the tiny little primary port and then all hell brakes lose as the secondaries crack open

for what you pay to modify a stock intake, a hogans would be cheap

I think LPE charged about 4k to do the bifurcation job

welding up a sheet metal intake isn't cheap, but it's not rocket since either

I'm seeing more "billet tubes" that are CNC machined and then welded to the base.

cool stuff. like to do a 3D carbon fiber printed intake someday. it would take a bit to do the CAD, and the 3D printers aren't cheap, but they are getting more affordable all the time.

you could design a much better shaped port with the right taper and plenum volume sized to the displacement for 7500 rpms and my bet is that it would work quite well.

even the "crab style" cross ram would look very cool and as long as the tubes are small enough it should build great port velocity

the LT5 intake has WAY too many turns and pinch points to really flow well up top due to the compromises for the packaging and injector housings

it looks cool, but me thinks we can do better with the modern high tech equipment

the nylon stuff on the LS motors is light, rejects the heat, and flows pretty decent without all the hassle. but the casting process is expensive to tool up and it would be tricky to make

the more I learn about the carbon fiber and 3d printing, the more I get excited about it. it's gone from "prototyping" to "small volume manufacturing" which is exactly what us LT5 guys need for a bunch of the parts no longer made

can you say "group buy" they we digitize and make up whatever we need. the technology is getting cheaper and easier to use every day.

it's the bomb:cheers::dancing:dancing:fahne:

Re: If/When you go to siamesed Intakes?
 

I have seen a few of the "siamese" intakes, seems that they forgot to port them first....my whatever the hell you want to call it has more volume

Re: If/When you go to siamesed Intakes?
 

Yeah, your right Lee some of those siamesed plenums were not ported any bigger then stock size ports I think they were relying on the volume of the Siamese.
Some like the Siamese look.

POLO 1 :p

Pete

Re: If/When you go to siamesed Intakes?
 

for sure on port size. this is a 36 ball and before it went to Greg for repairs.

http://i7.photobucket.com/albums/y292/kpie/P1010209.jpg

Dont do the siamese intake. It's money lost in todays porting out there. buy Pete's cam's instead, you will do better then siamese.

Re: If/When you go to siamesed Intakes?
 

Here is the data I have for mine and Kevin's induction system. These are loss percentages. Higher loss = lower flow. This is a loss compared to each of our cylinder heads with just a clay radius, nothing else.

http://i1036.photobucket.com/albums/...ie/400lift.jpg

http://i1036.photobucket.com/albums/...ie/450lift.jpg

http://i1036.photobucket.com/albums/...ie/500lift.png