Awright, I said that I would never go down from the 3.33" pulley & here I am, planning out for a 2.87 (Urchin...correct?)

** 2.87 Pulley:
Vortech P/N 2A036-287 Supercharger Pulley, 2.87", 6-Rib
** FMU disk
Vortech 8:1 Fuel Management Unit disk
** Gates belt
Size: K060703
** Fuel Injectors
370cc Injectors from a 300ZX Twin Turbo.
** Apexi S-AFC or Greddy E-Manage
To tune the Air Fuel ratio for the large injectors will make things very rich.
** Blitz BOV (Blow Off Valve)??
Not sure is this is required.
** Bigger in-tank fuel pump (Walbro 255 lph)??
Not sure is this is required.
** Air-to-water Intercooler
Not sure is this is required.
-------------
What did I miss?
What (if any) may not be required?
Can our Vortech V2 blowers handle it?...safely...reliably?

Thanks

 

I'm thinking of going with the 2.87" pulley too. I don't know if an injector upgrade is necessary. I don't Kev upgraded his injectors with his 2.87" pulley. Jane has the same size pulley, I don't think she has upgraded the injectors either. I already have the Walbro high pressure fuel pump, the 8:1 FMU disc, and the Greddy BOV. I don't think the intercooler is necessary.

 

i think anything under a 3.25 you need a different BOV(the stock unit won't be able to hold the boost) try the greddy but then again i've heard it leaks. Oh why can't forced induction be easier.

 

yes the Greddy does leak

get the HKS SSQ Sequential BOV i think it is.. and you will have to have the flange welded to the pipe..

Jay25's BOV sounds sweet.. not sure which one he has.. but it almost sounds like a turbo

 

Jaime has the Blitz SS BOV.

 

A couple more things...

** upgraded Fuel Rails
** Place Racing Engine Mounts
** 2-steps colder plugs? What size gap? .005?
** Water Injection

 

this is getting interesting!

 

if I remember correctly, if you do the injectors your fmu is TOO big.. talk to matt, i think he went with a 3:1..

oh.. and a fuel pressure regulator so you can hold the idle.

 

You are correct Brett... if you go with the Z injectors, look into the 4:1 or 3:1 FMU disc. You are now putting out more fuel with each pulse of the injector, therefore there is less reliance on Pressure through the existing pulse.

You will need a FPR unless your going with the ECU... and in your case Dashing, that is not an option.

Fuel Rails?? I don't think anyone makes them for the Max... you may want to look into have them bored slightly, but I don't see it being a hindrance at all.

Motor mounts... nice to have, drivability is somewhat sacrificed though

If you go bigger injectors you could probably go back to stock plugs, or at the most 1 step colder, .005 is way too small a gap...

Water injection has not met with much love from the Maxima people here. Kevin, Jane and MardiGras have all done it, and I believe that none of the above 3 continue to use it. Seems to rob too much power

You need to decide which route your taking with the fuel. Whether your sticking to the Stillen fuel setup or going with the Injectors/FPR setup. That will dictate which FMU disc to use. You need to make that decision first, before you start buying any fuel goodies.

Super-AFC may not be a bad idea, definitely get the Blow off Valve... Air to water intercooler is also not required. I would suggest you check out the J&S UltraSafeguard that MardiGrasMax pioneered. That IMHO is the single most important piece of the puzzle to running ridiculous boost on the motors, and it will give you the piece of mind that if you run it out to 14 PSI you won't be looking at a melted VQ.

I think the V2 can handle it for sure, If you haven't already, invest in an oil cooler, that is the single most important thing you can do to protect the blower IMHO. The cooler the oil the happier the motor and blower. It definitely made my car happier, I can't stress it enough.

Lata
Del

 

** 2.87 Pulley:
Vortech P/N 2A036-287 Supercharger Pulley, 2.87", 6-Rib
** FMU disk
Vortech 8:1 Fuel Management Unit disk
** Gates belt
Size: K060703
** Fuel Injectors
370cc Injectors from a 300ZX Twin Turbo.
Not needed


** Apexi S-AFC or Greddy E-Manage
To tune the Air Fuel ratio for the large injectors will make things very rich.
Not needed


** Blitz BOV (Blow Off Valve)??
Not sure is this is required.
Recommended


** Bigger in-tank fuel pump (Walbro 255 lph)??
Not sure is this is required.
Not needed


** Air-to-water Intercooler
Not sure is this is required.
Not needed


Try not to get the HKS SSQ BOV because you want to release all the pressure of the SC since it is belt driven and will try to make boost if the RPMs are high enough.

 

Bobby I know you like your max streetable so I'll advise against the PR Motor Mounts. I know some guys on here say they aren't bad at all, but brian had them on his car and he took them off because he couldn't stand them he said they made the car unbearable.

 

I'll most likely get the Blitz BOV. C'mon Kevin. a 2.87 pulley pushing 11-12psi boost & NO INJECTORS?!?!
The kinda boost I am running right now (3.33") is equivalent to 100 shot nitrous. 100 shot folks require atleast 85 psi fuel pressure. 90psi is the maximum on our 240cc stock injectors. I think I'm pushing them as it is.

Does 5th gen & 4th gen have the same injectors? If so, what fuel pressures do you see Kevin with your 2.87" pulley?

 

Excellent write up Delio. Thx!
** I already have the Permacool Oil Cooler kit. check...
** PR Motor Mounts are out...
** Fuel Rails are out...
** Water injection is out...
** I would rather stick with the Stillen fuel setup if it will serve my needs. Chances are, I'll REQUIRE upgraded 370cc fuel injectors to safely deliver >90psi fuel pressures.
** also, Do I need FPR *AND* S-AFC? Can I just go with one instead of both?
** Air-to-water intercooler is out...kinda expensive anyways.
** Blitz BOV is in.

Fuel...fuel...fuel. *scratches head*

 

No fuel pressure gauge. In theory, I am pushing 105 psi.

You can go higher than 90psi ... just ask SR20DEN (120).

 

Is that okay to do that safely, reliably & consistently?
How can I measure injector duty cycle?

 

If your going to upgrade your injectors, just go with the 370CC's off of the 95-96 Z's (earlier years do not work), and drop the FMU disc to 4:1 or 3:1 you will never again approach the 90 PSI mark for fuel pressure because you will be getting the extra fuel in the pulse of the injector, seeing more volume, and less pressure. With the right tuning you can get them to equalize if not create an even better A/F ratio. You would be keeping Fuel pressure in the 60's or whatever the math works out to be.

**if you are only going to go with EITHER the FPR or S-AFC AND you go with the bigger injectors definitely go for the FPR... THe AFC is snazzy and all, but you will absolutely need the FPR to lower base fuel pressure down to compensate for the extra fuel being let in at idle due to the bigger injectors.

Do a search for MardiGrasMax and his injector post. He had a sweet post on what he did to make it work, you will have to replicate what he did almost to the T in order to make your car IDLE and behave normal off boost, as well as having all the fuel there in boost, high boost, and MEVI boost.

Good luck.

 

If you want safety, follow Delio's suggestion about upgrading the injectors.

 

If you want safety, follow Kev's suggestions about following Delio's suggestion about upgrading the injectors.

 

Como se dise "POST *****" in Espanol?

 

So, in conclusion. Here's is what is required/recommended to safely push the Maxima VQ to ridiculous 2 digit boost levels using a 2.87" pulley:

** 2.87 Pulley:
Vortech P/N 2A036-287 Supercharger Pulley, 2.87", 6-Rib
** FMU disk
Vortech ??:1 Fuel Management Unit disk. With injectors 3:1 or 4:1 disk. Requires some tuning.
** Gates belt
Size: K060703
** Fuel Injectors
370cc Injectors from a 300ZX Twin Turbo. (95-96 only)
** Blitz BOV (Blow Off Valve)
To hold & release the extra boost efficiently.
2 step colder plugs
Someone confirm the part# NGK PFR5G-11. Decrease the gap .005
Permacool Oil Cooler kit
Myself already have one but those who don't...should get it.
Fuel Pressure Regulator (FPR)
Paxton or SARD or ???
Does anyone have part numbers.
Gauges
Fuel Pressure, EGT, Boost, Air/Fuel.

Profe$$ional Dyno Tuning
...using a wideband O2 sensor for optimum results.

 

 

If you go with the bigger injectors I don't think you will see the need for the colder plugs... Air Fuel guages for the most part are junk unless you spend the cash for a nice unit. Make sure the injectors are from a 95-96 Z TT.

 

I ordered the 2.87" pulley already. I'm planning to install it probably after the school semester is over. I don't plan to upgrade the injectors, Kev said it's not necessary. Besides, injectors aren't cheap!

 

puta del poste

 

 

Run this at your own risk. Neither Jane or my car have had any problems with the pulleys, but it may be different for your car.

 

Kev has a 5th gen.

What you need to do is install an AFC and take your car to Lightning and have it tuned. Adding more boost will give you more high rpm power but with out tuning the AFR in the midrange you will be flat until you get way up in the RPM range, IMHO a very bad thing for an auto.

The power is in the tuning.

PS; Injectors are cheeper than a motor swap. Their are a few people who have had injector failure from super high fuel pressure in 4th gen's.

 

stop posting in 4th gen forum..



i KNOW you don't want me to come over to the 54th gen and make you look silly..




[IMG]

 

I sent you an email about this a few days ago. What do you think is the safest possible system fuel pressure before the fuel rails break and injectors get choked?
100psi? 90psi?
Also, is it reasonable to assume that the static flow of Nissan OEM fuel injectors is 43.5psi?

 

 

~90psi

fuel pressure is 43.5 at wot

factory injectors are ~239cc, iirc

 

Nice one!

 

be sure the freakin mill down the center bolt so your belt will clear with the smaller pulley.


also. think about the rotational impeller speeds with that size. DO NOT run at extended periods of time at high boost... the revolutions exceed vortechs's v2 safety spec.

 

 

So, what is the consensus on impeller speed?
50K rpms?
or
55K rpms?

 

The Vortech website lists the max speed for both the V1 s-trim and V2 SQ blowers as 50,000 rpm. The V1 t-trim has a 55000 rpm max speed.

 

Cheston is right on the money here guys. Vortech admitted to me that the blowers had some head room, but they can self distruct and explode sending metal fragments into your motor and taking it down also. I only do acceleration runs up to ~120. I dont do long high speed runs, or hold it in gear at above 6k for longer thatn a second.

 

Yeeehh! For once he sure is
According to Vortech Calculator, the 3.125 pulley (assuming that our crank pulley is 6.5") produces an impeller speed of: 48807.2
Therefore, peeps running 3.125 or larger shouldn't have to worry too much...correct?

Thx

 

3.125 or larger..... not smaller.

 

Right...right...of course
dangerous typo eh...