Tmars

iTrader: (4)

Opinions please.

Is it worth wiring in the rpm switch to control the power rod on a supercharged vq30 with the 00vi. Or just take the power rod out? Has anyone tried this on their supercharged de-k or supercharged de-00vi, any disadvantages, advantages other than less work in the intake swap. It's getting force feed it's air so is the power rod really doing anything anymore when it opens in terms of performance gains ?

I could not find any threads on boosted engines trying this.

Tmars

iTrader: (4)

Nobody has removed the power rod in the 00vi on a boosted max?

Kevlo911

iTrader: (36)

You will still lose low end power. You should gain top end but it is up to you if it is worth the low end loss.

Tmars

iTrader: (4)

Have you tried it, remove the power rod on a supercharged vq30VI?

Because if you think about it the manifold was not designed for forced induction it was designed for a naturally aspirated engine and the velocity of incoming air in a second runner to give more air. So with that said how does it hurt low end torque when you are forcing in air with a supercharger, it's design shouldn't matter anymore but the size of the intake runner should and with the power rod removed you get two runners full of compressed air going to the combustion chamber= more volume. Like changing from a 2.5" charge pipe to a 3" more volume.

Anyone one else have an opinion?

streetzlegend

iTrader: (8)

You will still loose the low end torque/power, I removed mine when I had a 3.0 00vi and noticed specially since my car is automatic, I depended on that slight low end advantage. You should be able to gain more top end power by removing it though, it basically moves your torque curve to the right, it did for me on my dyno's.

Quickywd01

iTrader: (16)

I wonder how much boost the 00vi manifold can take.

mywhitewolf

because the fluid dynamics working on the moving air are the same, it doesn't negate the affects of tuned length runners buy using forced air, it changes their effective rpm range and overall efficiency, but they still "work" as such.

I THINK with the manifold the higher the pressure the faster the pressure wave pulse. which means that to have the same volumetric efficiency you have to increase the length of the runners. which would mean that forced induction would also move your power curve to the right slightly (not counting the actual performance increase you get with FI) so removing the power rod will mean that the gained benifits would be even further right than it would be on a NA car.

However all the changes are dwarfed by the amount of difference the efficiency range of your snail shell is.

however, if you think about it, the easier you are on the charger (the less restrictions of forcing air into the engine) the less the charger has to work so the less power its robbing from you (in heat). so by removing the power rod you might get better air (less heated air) into your engine in the upper RPM range, which would be useful if you have a small charger that's not so efficient in the upper rpm range.

as i think everyone uses the same supercharger here which has a very good efficiency range for the higher rpm, i would personally leave the power rod where it is to maintain good mid range performance. however if you want to maximise your upper rpm torque, feel free to remove it.

I would expect a difference of approximatly (horse power gained on NA * absolute psi / 14.7) so if your running 7psi, which is ~21 absoulte psi, you should see a 50% improvment on expected horse power gains on NA.

this is a VERY simplified version of the maths required to calculate the fluid dynamics of the system however should give you a very ROUGH idea on what breathing mods will do for your FI system post charger.

OC_Nooby

iTrader: (11)

Sorry for resurrecting this old thread. I just installed my supercharger and I have an 00vi on my 4th gen. I can have it so the power rod gets activated right away or at 5500 rpm (cant remember if its there). I like low end power, so should I just have it activate at 5500rpm (like NA) or will this make no difference at that point and have it always one.

Thanks

Tmars

iTrader: (4)

l think all the supercharged/00vi guys are still leaving it set at the same activation point as N/A to keep the low end torque, between 4900-5200rpm. Mine is set at 4900rpm, and pulls like a jet to the red with a 3.125 pulley.

OC_Nooby

iTrader: (11)

Alright ill have her activate ^_^

Quickywd01

iTrader: (16)

I'm currently installing an '00VI and I just removed the LIM swirl valves and was about to do the same to the UIM thinking that since it's S/C'ed it should make up for the low end loss. Being auto and reading this makes me want to leave the UIM power rod especially since I have a stock rev limit. This should be left to those with extended rev limiters to take full advantage of removing the rod.

aic96max

iTrader: (12)

i was 5 sp, over 20 pulls on a de intake, and 20 on 00vi, (old car) turbo, i didnt loose anything, stock rev, all was positive, the drop in power after 5200 didnt happen , kept going up. this is comparing a de to a swirl valve removed oovi, never dynod with it closed and then opening after certain rpm . to me it was more crap to wireup for minimal potential gains. when youre florred, even being auto, do the rpms actually drop below 4-4500 anyways? maybe a search in the dyno thread will help. once your force inducted, the gains should be minimal, it wont be a 100 ft lbs difference imo

maybe you can post both dynos, with and without the valve

Quickywd01

iTrader: (16)

I saw a dyno of it the other day but everyone's setup is different. The mid-range tq. will be beneficial since I'll be driving this thing everywhere and less power at WOT shifts will reduce stress on the trans. I'll leave it in for now and pull it out later to see what happens.

t6378tp

iTrader: (69)

imho, if your boosted and started to build + boost psi before 45k I would just remove it

streetzlegend

iTrader: (8)

In my setup, not having the power rod in the manifold affected my low/mid, noticeably. Part reason because im automatic with a laggy turbo, so I NEEDED that 00vi low/mid power. I also had issues with the methanol corroding the rod and making it get stuck and unmovable, so on a dyno I saw the torque very late in the power band. Once I sanded it down and fixed it, It was very noticeable.

ghostmax301

iTrader: (7)

Leave it in