TT402LS1

iTrader: (5)

I was looking over my engine and was thinking the Victor Jr. manifold might look a little better than the LS6 intake. (in my car) I also like the idea that I can "tap" the manifold, for a cleaner look. (vac. lines) Besides heat soak, is there any other draw backs to using this manifold? How will it affect my lower end? I was thinking on a FI car it wouldnt make the big of a differance. Most of the cars I see here with the Victor Jr., are mostly race type vehicles. Anyone using this manifold on the street? If so, any regrets??

OBTW - I will be running a Comp cam with 224* duration and .580 lift with a 114 LSA.

Thanks - Ron

HAMRHEAD

iTrader: (8)

I have never used it but was informed that it would work well on my TT setup. I would lose a little torque but in that setup it wouldn't be a big deal. I think it is the better intake for a FI setup but the only reason I didn't use it was hood clearance. Most of the big FI setups use this type or the GMPP intake.

Speed

iTrader: (33)

Ask Tiago. I believe he is running one on his 1khp street car with no problems.

V6 Bird

iTrader: (15)

You can gain alot of that torque back and exceed it if you work the intake and match the cam. Putting it on box stock with a mismatched cam will yield exactly the results you read about on here and that you posted.

stevieturbo

https://ls1tech.com/forums/forced-induction/605899-reason-switching-carb-intake.html

Got Me SOM

iTrader: (2)

that's the thing nobody has figured out what cam to run since it changes up the events drastically.

wish they could adapt an edelbrock performer manifold to our car. i think a dual plane would work best.

TT402LS1

iTrader: (5)

They make a Performer RPM madifold for the LS1, but you would have to modify it for EFI.

TT402LS1

iTrader: (5)

I can understand NA cars loosing lower rpm tq. Dont the fact that its FI help get back that lower end tq.? I like the idea of better flow to all cylinders, but dont want to loose drivablity. This would have to be better than running a sheetmetal intake, wouldnt it??

Thanks - Ron

Baldturbofreak.com

I would have to think so. look at it this way, my Lt1 has a 3" runner and I have no drivability issues. Lsa and intake centerline will have alot to do with making the shorter runner work. But what are we really talking here, 40-50 ft lbs off boost? you can feel it yea, but you'll quiclky forget as the boost rolls in and pulls alot harder up top.
If you have heads that outflow the intake (not hard to do) you'll pick up a good gain there. I have head of ported versions in the 380+ range.
Besides sheet metal intakes can be a pain, as they are usually prone to cracking after prolonged use. A casting has alot more wall to it, and less residual stress in the metal from it's construction/machining.
We are going to try one on my buddies Twin 42R 402 once the motor is broke in. I dont wanna push the motor much beyond 12-14 psi on the Fast 90/90. for fear of distribution issues at 160+ lbs/min.

lbz34

iTrader: (3)

I whould have some results here in a few weeks when my turbo comes back. was on a ls6/stock TB. Going to victor jr/Elbow stock TB. Only change will be going from tr6 plugs to the tr8's. same boost same tune. Will try 10 psi since that is what the last dyno was on.

SVC707

iTrader: (33)

i can tell you the. gmpp i am running now smoothed out my idle and cold starts much better than when i had the fast 90. but i will also give it up to rick @ synergy for getting it so smooth too. but he also stated that it runs smoother with this manifold
my cam is 24x/25x .64x 115

JMBLOWNWS6

iTrader: (17)

Ok Mike Ill send you my cam specs,Head flow numbers and the intake and you do the porting.

Inspector12

iTrader: (29)

Me too I'll send him mine and let him show me how these parts are supposed to be matched. Give some credit to some of these few guys that have already played with it, although I will be doing my own comparison very soon and will give my opinions.

JMBLOWNWS6

iTrader: (17)

You dont know **** about FI I wouldnt run your cam if they gave it to me!

TT402LS1

iTrader: (5)

So far seems the Victor Jr. isnt such a bad idea. Do you think the cam is too small? I really dont want to run anything bigger. This is a street car, and I want it to be very streetable.

Thanks - Ron

stevieturbo

My cam is a baby compared to yours, but my car also drives better than ever after I fitted the Victor Jnr.

It just doesnt really go any faster than it did with the LS6/Stock TB.

TT402LS1

iTrader: (5)

What size cam you running? Bigger or smaller than mine? I see your also running a M6. Can you notice a differance when taking off? (normal street driving)

Thanks - Ron

TT402LS1

iTrader: (5)

Oh, what kind of TB you running. I was thinking about running a 4BBL type 1000cfm.

Thanks Ron

stevieturbo

Im on a 382 with a 224/230, 0.581/0.591 on 115+4

With the intake and 85mmTB, the car feels more torquey, bu a lot of that could be down to the simple fact its getting more air, at smaller throttle openings than before with the bigger TB.

I dont believe outright power has made any big increases.

But the car does idle better, and generally drive much nicer than it did before. I did spend a little more time on that though when tuning.

pwrtrip75

iTrader: (8)

i have one on my 5.3 w/ a 224/224 .580/.580 112 cam, its like driving a 200hp car around off boost. With the stock cam it was pretty snappy off idle. I think my cam selection sucks.