If/When you go to siamesed Intakes?

[rkreigh]

Originally Posted by Polo-1

Hey Al

It was both that Greg had mill flat.
I bought all new plenum, and housings, sent out for siamese runners got back a wrapped used mess from Kirchhofer. I sat on it for a few years then had Greg Van Deventer port it and mill it all flat. So I bought new parts, got used parts back that would not seal, then Had the right Guy fix it.... This is why I say " go to the right guy first ".

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!!

[FU]

Originally Posted by rkreigh

with the big cams and light flywheel the LSV feels a little soggy

Yep that will do it.

[A26B]

Originally Posted by rkreigh
with the big cams and light flywheel the LSV feels a little soggy

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.

[RHanselman]

Originally Posted by rkreigh

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!!

Boost is the key to your ills...

[rkreigh]

Originally Posted by RHanselman

Boost is the key to your ills...

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

[Schrade]

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.

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?

[Pete]

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

[rkreigh]

Originally Posted by Pete

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

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

[Pete]

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

Pete

[Polo-1]

Originally Posted by Pete

Hmmmm
Siamese vs Nicely Ported

Pete

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 $$$