VORTEC S/C 2.9VR6

[Dubsingh 0]

HI guys/Gals

I posted a thread here some time back with regards to the golf ralley i was looking to purchase...its running a vortech s/c (on an OBD1 2.9)......ohhhh myyyy god the thing dose half shift had a subaru eatin my dust !amazed !lol !amazed !lol .......

now i need some help.....the MAF is placed between the s/c and t/b iv been told this needs to be before the s/c......and where can i get hold of the neat pipe work from s/c to TB as mines a mish mash of carbon,silcon hoses... a bit crap....and after speakin to vince at stealth i found ut i do not need the CAT (bonus) how much power will getting rid of the cat give......

the intake for the s/c is quite low dwn im worried about hoverin up water into the engine how can i prevent this?

[mightyvr6 0]

You could leave the maf where it is if the car runs ok. If not, you can buy an upper intake and CAI from C2 Motorsports and relocate the maf, and plumb in a recirculating dump valve. (www.c2motorsports.net) I did the same on my car and it runs great.

I've got a plastic splash guard at the bottom the wing to protect the air filter from splashing. There's also something called a pre-charger which is a bag with a micro-filter which fits over the top of the air filter (K@N sell them). I don't think splashing is too much of a problem as teh filter is oiled and repels water. As long as you don't drive through massive pools of water you should be ok.

The cat - get rid of it and you should liberate a few horses (probably 10-15) depending on how restrictive the exhaust is.

[Dubsingh 0]

sound the car seems to be running to rich....and when pushed hard i get a pop followed by black smoke (im presume unburnt fuel right?)

out of intrest what is the spec of your car? i do not see the oil feed on ur charger....ceramic bearing?

[mightyvr6 0]

I don't think Vortechs use ceramic bearings.You can see the oil feed going to the charger(black pipe) in the picture. Mines 2.9, vortech v1, stock compression, maf before the charger, 6.5 psi no intercooler.

You might be running a bit rich as the maf is after the charger - air is constantly be registered by the maf's filament and the ecu is chucking more fuel in even when your not on the throttle.

[Dubsingh 0]

sweet mines a 2.9 with vortech charger using z engineering fitting kit, i thinks its only at 4 psi not sure (how do i find out) vince at stelth had it on the rollers ant it registered at 250.2 bhp at 5764... oh the best bit this set up is in a rallye....i undertand you have at your disposal the fitting guide to this kit?

[mightyvr6 0]

You can check the boost using a boost guage plumbed into the intake manifold. I think yours should be about 6 - 6.5 psi boost using a 3.25" pulley.

I've got the AMS supercharger kit fitting instructions which uses a v1/v2 headunit with mounting brackets designed by z-engineering.

Any pics of your engine bay?

[Dubsingh 0]

how do i get picture up on here?

[mightyvr6 0]

I think you have to host it (email to me if you want) and I'll host it.

[Dubsingh 0]

sound iv sent the email....i checked out the site u mentioned earlier.... i really likr the look of the kit where the give u the maf sensor slot already plumbed into the pipe that goes to the inlet of the supercharger.....u mentioned recirculating DV...could explain just how its gonna help/work?

[VR6Rich 3]

BTW you can add pictures to posts if you are a premium member ;-)

[mightyvr6 0]

Pic:

http://img.photobucket.com/albums/v406/corradovr6sc/vr6sc.jpg

The maf goes before the charger so the charger sucks through the maf which is better as the maf only registers airflow when you get on the throttle.

When the car is idling or on closed throttle the dv diverts air from the upper intake back into the path of the supercharger impeller which prevents air from being drawn through the maf so the car doesn't run rich off throttle (like it does with the maf after the charger). In additon the maf before the charger is a better setup as there is no build up of air pressure on the throttle butterfly which has nowhere to go. Instead it is recirculated back into the charger intake so there is no "lag" when you get back on the throttle.

[Nerih 0]

agreed with m.vr6, maf on intake side of charger is better...250bhp out of a vr6 would need 6psi, i cant remember what the rallye specs are.

m.vr6 cdan you possible take a sound clip of your charger, mine is quite noisy at idle....

[Dubsingh 0]

well the mk 2 rallye.....its basicly a mk2 with flared arches and 4 wheel drive. not quite sue what bore size i should go on the exhaust 3 3.5? i want something really free flowing...what you guys reckon?

[Nerih 0]

well from what vince has told me, the back pressure helps low end torque, which is where most people drive, the s/c only comes in above 3000rpm and builds to the red line, where backpressure is not wanted...to have the best of both id remove the cat and go for 3....just to maintain some low end torque.....which is where the vr6 is poor anyways, without a shrick.

[Ultimatetune 0]

i would go for a 2.5 inch diameter and 3 max

[Dubsingh 0]

hi all where can i get custom pipework for my charger???? the old induction pipework and filter got runover after falling off stupi jublee clip broke.