I notice that no one has a set up with 5-7 PSI (350WHP) and short gears?
03-29-2010 | 04:21 PM
#21
I have changed the differentials and gearing in my car several times. So I have tried the 3.5's, 3.9's and 4.08's all with and without the Vortech. They do make quite a noticable difference. I think the 3.9's are a nice compromise for my setup. I have a T-trim and am running 12-13 psi.
The gears almost make it feel like you are driving around in a lower gear. For example 6th gear feels like 5th. The rpm's climb faster and get you into the boost sooner
03-30-2010 | 11:19 AM
#24
Registered User
Joined: Oct 2007
Posts: 1,891
Likes: 1
From: Chicago
From physically looking at a stillen, I think its lack of volume is the issue. Is it even a 1L blower? I just don't think it is capable of flowing enough air to be compared to the centrifigul's and turbo's that are available for us crazies.
Tom
Tom
Generally speaking, a positive displacement supercharger will have better low end than a turbo, but a centrifugal supercharger will not. In fact, the turbo kits made for our cars generally outperform the centrifugal superchargers for the VQ platform across the entire rpm range. Most of the SCs I see posted here are the centrifugal type.
I think Stillen does make a small positive dispacement SC for the VQ, but I don't know how well it performs. Based on its general lack of popularity, I would assume that it also does not perform any better, or perhaps performs worse, than a good turbo kit in the low rpms, and certainly won't perform better in the high rpm range. I have not seen anyone here in the forum use a good strong positive displacement SC on the VQ, though it would be interesting to see. There is some discussion on SCs in a thread relating to twin-charging I started a while back. You can probably search on the term "twin-charging" and my screen name and find it if you are interested.
Also, one more thing to note; a SC requires mechanical energy direct from the crank to operate, thereby eating up some of the hp that is produced. In other words, you will be pushing the motor harder to get the same whp numbers in comparison to a turbo setup. Turbos extract energy from the exhaust gases, so they really don't take any additional hp to push (ignoring the effects of back pressure). The centrigugal SCs probably don't take a whole lot of hp to drive, but the large positive displacement SCs certainly do.
I think Stillen does make a small positive dispacement SC for the VQ, but I don't know how well it performs. Based on its general lack of popularity, I would assume that it also does not perform any better, or perhaps performs worse, than a good turbo kit in the low rpms, and certainly won't perform better in the high rpm range. I have not seen anyone here in the forum use a good strong positive displacement SC on the VQ, though it would be interesting to see. There is some discussion on SCs in a thread relating to twin-charging I started a while back. You can probably search on the term "twin-charging" and my screen name and find it if you are interested.
Also, one more thing to note; a SC requires mechanical energy direct from the crank to operate, thereby eating up some of the hp that is produced. In other words, you will be pushing the motor harder to get the same whp numbers in comparison to a turbo setup. Turbos extract energy from the exhaust gases, so they really don't take any additional hp to push (ignoring the effects of back pressure). The centrigugal SCs probably don't take a whole lot of hp to drive, but the large positive displacement SCs certainly do.
03-30-2010 | 11:24 AM
#25
It is an Eatom M90 from the looks of it. That is a 1.5L supercharger, and should be plenty for the VQ. If ported, that goes up to 1.7L. They use the same blowers on the 3.8L Pontiac Grand Prix. Some of those guys are getting 14psi of boost with the proper mods.
Those superchargers are good for 8-10psi, anything past that they will just blow hot air.
It looks like it is made for engines up to 5.7L:
http://www.capa.com.au/eaton_m90data.htm
One thing to note, if you look at the 10psi vs HP chart, it takes 42hp from the engine to make that 10psi of boost. At this same 10psi the discharge temperature gets to 180deg F.
The 4th generation is a bit better;
http://www.capa.com.au/eaton_mp90_4th.htm
EDIT:
I guess it is an Eaton M62
Last edited by Boosted Performance; 03-30-2010 at 01:32 PM.
03-30-2010 | 11:35 AM
#26
Registered User
Joined: Oct 2007
Posts: 1,891
Likes: 1
From: Chicago
Even just physically comparing it to the stock eaton that was on my 03 cobra...its teeny. But the eaton on the 4.6L V8 of the cobra it was good for about 600-650 if you spun the bageeses outta it. I dunno much about the M90 though.
Tom
Tom
It is an Eatom M90 from the looks of it. That is a 1.5L supercharger, and should be plenty for the VQ. If ported, that goes up to 1.7L. They use the same blowers on the 3.8L Pontiac Grand Prix. Some of those guys are getting 14psi of boost with the proper mods.
Those superchargers are good for 8-10psi, anything past that they will just blow hot air.
It looks like it is made for engines up to 5.7L:
http://www.capa.com.au/eaton_m90data.htm
One thing to note, if you look at the 10psi vs HP chart, it takes 42hp from the engine to make that 10psi of boost. At this same 10psi the discharge temperature gets to 180deg F.
The 4th generation is a bit better;
http://www.capa.com.au/eaton_mp90_4th.htm
Those superchargers are good for 8-10psi, anything past that they will just blow hot air.
It looks like it is made for engines up to 5.7L:
http://www.capa.com.au/eaton_m90data.htm
One thing to note, if you look at the 10psi vs HP chart, it takes 42hp from the engine to make that 10psi of boost. At this same 10psi the discharge temperature gets to 180deg F.
The 4th generation is a bit better;
http://www.capa.com.au/eaton_mp90_4th.htm
03-30-2010 | 12:36 PM
#30
It's an M62 not an M60. The Cobalt SS SC has this same blower....in a 2.0L 4cyl engine. Even the M90 would be kinda smallish, although with the M90 you can at least get 400whp out of it.
Why doesn't anyone make a screw type SC for these cars? It would be insane.
Why doesn't anyone make a screw type SC for these cars? It would be insane.
03-30-2010 | 01:31 PM
#32
Wow, I did not think they were dumb enough to use an M62 on a 3.5L.
The lack of power is not making perfect sense. All this time I was confused by the system, thinking that it is an M90 supercharger.
03-30-2010 | 03:24 PM
#33
I have changed the differentials and gearing in my car several times. So I have tried the 3.5's, 3.9's and 4.08's all with and without the Vortech. They do make quite a noticable difference. I think the 3.9's are a nice compromise for my setup. I have a T-trim and am running 12-13 psi.
The gears almost make it feel like you are driving around in a lower gear. For example 6th gear feels like 5th. The rpm's climb faster and get you into the boost sooner
The gears almost make it feel like you are driving around in a lower gear. For example 6th gear feels like 5th. The rpm's climb faster and get you into the boost sooner
03-30-2010 | 05:50 PM
#35
I rode in Z_ology's car today. For you supercharger guys a gear is a great thing to do! The boost really comes on strong and it keeps the engine in the powerband much better rather then that linear feeling the stock gearing gives you. I also noticed it wasn't annoying while driving at highway speeds (just put your car in 5th gear and see if you can tolerate that and it will give you an idea). This will be my next mod for sure! Thanks for the ride Nate!
03-30-2010 | 07:01 PM
#36
Since this engine has a 60 degree V, there isn't enough room to lower the blower into the "valley" and the other problem is that the timing chain/timing cover runs high across the front top of the motor.......this also makes the blower snout have to sit up high. basically, if you want a big roots/screw/whipple blower on your VQ35, your gonna have to run a prostock style hood!
03-30-2010 | 08:06 PM
#37
it's mainly a hood clearance issue.......the Z/G crowd is very picky when it comes to body mods.....and 99% of them are not going to go for a massive raised hood to accomodate a big roots-type blower. People made a big enough deal in regards to the stillen hood bump for the little Eaton M62.
Since this engine has a 60 degree V, there isn't enough room to lower the blower into the "valley" and the other problem is that the timing chain/timing cover runs high across the front top of the motor.......this also makes the blower snout have to sit up high. basically, if you want a big roots/screw/whipple blower on your VQ35, your gonna have to run a prostock style hood!
Since this engine has a 60 degree V, there isn't enough room to lower the blower into the "valley" and the other problem is that the timing chain/timing cover runs high across the front top of the motor.......this also makes the blower snout have to sit up high. basically, if you want a big roots/screw/whipple blower on your VQ35, your gonna have to run a prostock style hood!
03-30-2010 | 09:12 PM
#38
Last edited by 350Z400rwhp; 03-30-2010 at 09:14 PM.
