Any current/active members running 2.62 pulley?
09-11-2010, 01:42 AM
#1
Any current/active members running 2.62 pulley?
Ive searched and have found a few members that have used the 2.62 pulley in the past, back then they were worried about timing, but they didnt have the tuning options that we have (ie EU). So any current members looking into it or using it? I understand it will (can?) overspin the blower, but they say thats only really an issue if you hold peak rpms. If im running the 1/4 mile im at peak rpms for a second or so....idk. Would it be ok? btw, this would be on a DEK, with a V2, 440s, z32 maf, walbro 255, and EU for tuning.
09-11-2010, 08:19 AM
#2
Ive searched and have found a few members that have used the 2.62 pulley in the past, back then they were worried about timing, but they didnt have the tuning options that we have (ie EU). So any current members looking into it or using it? I understand it will (can?) overspin the blower, but they say thats only really an issue if you hold peak rpms. If im running the 1/4 mile im at peak rpms for a second or so....idk. Would it be ok? btw, this would be on a DEK, with a V2, 440s, z32 maf, walbro 255, and EU for tuning.
Based on what Ive read on the older V2 units the max rpm that you want to spin them is around 45,000rpms. After that they begin to loose quite a bit of their effeciency. The newer V2 SC Si trim has a max rpm speed of 52,000
Based on the Vortech calculator running a 2.62 pulley on the older V2 blower it will hit 45,000rpms at 5240, well below the 6500rpm rev limiter. So anything above that and the blower will then be overspinning and therefore loosing its effeciency. Even the 2.87 overspins the V2 at 5740.
Im not sure if others steered a bit away from the 2.62 due to the timing issue because you can always adjust fuel to compensate for the timing. Im thinking it was more due to the overspinning issue and proper fuel setups.
Another thing to remember is a lot uf us aquired our blowers used, and they already had some wear and tear on them. To install one and then begin using a smaller pulley to build more booost but overspin the blower would just lower the life span of the blower even more which would result in the need for a rebuild much sooner.
Do you know how many miles are on your blower?
09-11-2010, 08:52 PM
#3
Im using the 2.87 pulley right now. Im not sure how many miles are on the unit itself, but it was rebuilt before i bought it so its at a couple thousand miles, on the bearings anyways. Thanks for the insight though. Ive read a lot of people saying itll be ok, including those that used it (like Meximax i believe). Then you have the ones that are worried about it. I was just curious about the situation. I have all of the supporting mods for it, i guess i dont have the proper blower for such a small pulley.
09-12-2010, 06:55 AM
#5
what i dont understand is that every time i see someone using a 2.62 pulley they are at like 12psi so why even try to use it. i never seen anyone hitt the full boost of that pulley what ever the psi is. i see people get 13-14psi out of the 2.87 pulley
09-12-2010, 08:29 AM
#6
Also the VQ I read in another thread somewhere on here eats boost very well. The "boost" guage is measuring the resistance of the engine to air being fed. So two dif. motors with same pulley will yield dif. "boost" #'s.
I dont believe it was timing that kept people from it, rather as FLAVA mentioned the overspinning. Get a T trim. I hear you can really wind those up. Belt slip would be a concern as were not COGg style.
Also the OP's mention of engine management is right. Since back in the day we didnt have as such a fine control as EU gives us. people stayed away.
If you want to go BIG BOOST why not turbo? Im sure your SC kit will fetch a pretty penny and i see turbo kits(piping) being sold for cheap on here all the time.
Last edited by HomerMAC; 09-12-2010 at 08:37 AM.
09-12-2010, 02:04 PM
#7
Really?
Thats weird. Im wondering if the pople you saw making those boosts numbers had an intercooler setup and used the 2.622 pulley to gain some boosts back.
I know when I was running the 2.87 on my older V1, I easily saw 13-14lbs of boost at redline. Once I did the FMIC my peak boosts went was at 11.5-12psi.
depending on setup. Mostly plumbing/ choice of air/air or air/water. If your running a HUGE air with all that plumbing and bends AND WHICH BLOWER. like flava said EFFICENCY is key. if your past eff. then your just making alot of sound.
Also the VQ I read in another thread somewhere on here eats boost very well. The "boost" guage is measuring the resistance of the engine to air being fed. So two dif. motors with same pulley will yield dif. "boost" #'s.
I dont believe it was timing that kept people from it, rather as FLAVA mentioned the overspinning. Get a T trim. I hear you can really wind those up. Belt slip would be a concern as were not COGg style.
Also the OP's mention of engine management is right. Since back in the day we didnt have as such a fine control as EU gives us. people stayed away.
If you want to go BIG BOOST why not turbo? Im sure your SC kit will fetch a pretty penny and i see turbo kits(piping) being sold for cheap on here all the time.
Also the VQ I read in another thread somewhere on here eats boost very well. The "boost" guage is measuring the resistance of the engine to air being fed. So two dif. motors with same pulley will yield dif. "boost" #'s.
I dont believe it was timing that kept people from it, rather as FLAVA mentioned the overspinning. Get a T trim. I hear you can really wind those up. Belt slip would be a concern as were not COGg style.
Also the OP's mention of engine management is right. Since back in the day we didnt have as such a fine control as EU gives us. people stayed away.
If you want to go BIG BOOST why not turbo? Im sure your SC kit will fetch a pretty penny and i see turbo kits(piping) being sold for cheap on here all the time.
Running the Si blower, with the same 2.87 pulley with my FMIC Im now seeing 15-16lbs of boost at redline.
http://www.youtube.com/watch?v=oVICu...er_profilepage
09-17-2010, 07:02 PM
#8
Really?
Thats weird. Im wondering if the pople you saw making those boosts numbers had an intercooler setup and used the 2.622 pulley to gain some boosts back.
I know when I was running the 2.87 on my older V1, I easily saw 13-14lbs of boost at redline. Once I did the FMIC my peak boosts went was at 11.5-12psi.
T trim is really designed for cars that have high revving capabilites. The Si blower is more ideal for our cars.
Running the Si blower, with the same 2.87 pulley with my FMIC Im now seeing 15-16lbs of boost at redline.
http://www.youtube.com/watch?v=oVICu...er_profilepage
Thats weird. Im wondering if the pople you saw making those boosts numbers had an intercooler setup and used the 2.622 pulley to gain some boosts back.
I know when I was running the 2.87 on my older V1, I easily saw 13-14lbs of boost at redline. Once I did the FMIC my peak boosts went was at 11.5-12psi.
T trim is really designed for cars that have high revving capabilites. The Si blower is more ideal for our cars.
Running the Si blower, with the same 2.87 pulley with my FMIC Im now seeing 15-16lbs of boost at redline.
http://www.youtube.com/watch?v=oVICu...er_profilepage
you and your cuddly panda beast... whats your redline?
thats alot of boost with an FMIC. you still have that HUGE one that i remember seeing at one time.
09-17-2010, 07:46 PM
#9
09-17-2010, 08:58 PM
#10
how do u make 13-14 psi? whats your exhaust set up? im only seeing 9.5 on a V2 (which is suppose to make more than V1 right?) , granted i have stock headers, 2.5 inch catback, out to a dynomax muffler. im hoping a 3 inch will fix that problem.
09-18-2010, 07:12 AM
#11
I never saw a change going from the 2.5 to the 3.0
9.5 psi is pretty low for the 2.87 pulley, I would see 10psi with my 3.0 pulley. Are you using an intercooler? Have you checked the belt to insure its not slipping? Also check your bov to insure its holding boost?
Last edited by Flava_24/7; 09-18-2010 at 07:19 AM.
09-18-2010, 10:59 AM
#12
I don't think opening the exhaust flow will change your boost levels.
I never saw a change going from the 2.5 to the 3.0
9.5 psi is pretty low for the 2.87 pulley, I would see 10psi with my 3.0 pulley. Are you using an intercooler? Have you checked the belt to insure its not slipping? Also check your bov to insure its holding boost?
I never saw a change going from the 2.5 to the 3.0
9.5 psi is pretty low for the 2.87 pulley, I would see 10psi with my 3.0 pulley. Are you using an intercooler? Have you checked the belt to insure its not slipping? Also check your bov to insure its holding boost?
Im not using an intercooler. The sign of belt slippage is? It builds boost then all of a sudden falls off? If so, then nope, no belt slippage.
U may be onto something with the bov...when i first installed the setup i had to switch out to a way softer spring because with the original one it didnt vent at idle. So maybe now its too soft...hmm...
09-18-2010, 11:44 AM
#13
really? i thought the exhaust had some say...
Im not using an intercooler. The sign of belt slippage is? It builds boost then all of a sudden falls off? If so, then nope, no belt slippage.
U may be onto something with the bov...when i first installed the setup i had to switch out to a way softer spring because with the original one it didnt vent at idle. So maybe now its too soft...hmm...
Im not using an intercooler. The sign of belt slippage is? It builds boost then all of a sudden falls off? If so, then nope, no belt slippage.
U may be onto something with the bov...when i first installed the setup i had to switch out to a way softer spring because with the original one it didnt vent at idle. So maybe now its too soft...hmm...
10-01-2010, 02:45 PM
#15
10-01-2010, 04:17 PM
#17
10-01-2010, 10:06 PM
#18
what kind of intercooler do you have? 1-1.5 psi drop is not that bad for adding the intercooler. but if hes not losing any boost you should try his intercooler to see if you gain that psi back
10-02-2010, 01:02 PM
#19
Im seeing around 16psi now so Im not too worried about the 1-1.5 psi loss any more.
10-02-2010, 06:04 PM
#20
10-02-2010, 07:53 PM
#21
yea, 16 psi, that is a lot.
but anyway, something that ive overlooked in my setup, mainly because ive never had a problem with it, never thought about, and i did hit full boost with the 3.6 pulley (i know its not a lot), is that the impeller has very slight damage to it. that may be the issue. Its been smoothed out and everything by the previous owner, and he said it will hit full boost, but im thinking thats still probably the cause. like i said i never thought about it too much cuz the damage wasnt a lot, and it doesnt cause any issues whatsoever, except maybe its just not as efficient anymore.
but imma still search for other causes. how do you test for boost leaks? i know some people have developed boost leaks through their z32 maf, the "lid" in particular. what are other problem areas and how do you guys go about locating them?
but anyway, something that ive overlooked in my setup, mainly because ive never had a problem with it, never thought about, and i did hit full boost with the 3.6 pulley (i know its not a lot), is that the impeller has very slight damage to it. that may be the issue. Its been smoothed out and everything by the previous owner, and he said it will hit full boost, but im thinking thats still probably the cause. like i said i never thought about it too much cuz the damage wasnt a lot, and it doesnt cause any issues whatsoever, except maybe its just not as efficient anymore.
but imma still search for other causes. how do you test for boost leaks? i know some people have developed boost leaks through their z32 maf, the "lid" in particular. what are other problem areas and how do you guys go about locating them?
10-03-2010, 06:36 AM
#22
10-03-2010, 12:31 PM
#23
so what size pulley do you have on there now? i think the 2.62 pulley is just problems. i think the belt will touch its self i think thats why people only see like 12psi on that pulley that really sucks
10-03-2010, 12:53 PM
#24
10-05-2010, 01:01 PM
#27
10-06-2010, 11:21 AM
#30
Max Boost: 22 PSI
Max Flow: 1150 CFM
Max Power: 775 HP
Peak Efficiency: 78%
Oh, Im sure the car is more then capable of making more power by tuning, but when i had it tuned I asked them to tune it conservatively.
As it is, I already have a hard time with traction.
10-06-2010, 05:10 PM
#33
Thanks
Inspect each connection/coupler while the car is running and feel for any escaping air. You can also use a smoke machine.
Inspect each connection/coupler while the car is running and feel for any escaping air. You can also use a smoke machine.
10-06-2010, 06:12 PM
#34
Member
Join Date: Nov 2006
Location: Calgary
Posts: 176
I thought that you will only see full boost it first gear? I have stock stillen piping,pancake filter and the 3.33 pulley and I cant get 9 psi to read on my boost gauge in first gear never mind any other gears. could also be the gauge.
Last edited by brasso; 10-06-2010 at 06:17 PM.
10-06-2010, 07:19 PM
#35
If you look at that video clip I posted earlier in this thread you will see me hitting peak boost in 2nd, and then in third. Both gears hit the same boost level.
10-06-2010, 08:24 PM
#36
Member
Join Date: Nov 2006
Location: Calgary
Posts: 176
alright i was just reading this thread http://forums.maxima.org/supercharge...-question.html. and it said other wise.
Yea i saw the video, thats what got me looking at other threads. Cause i just had my blower rebuilt and i was wondering why i cant get full boost in all the gears like you did. I thought it might be the stock piping and filter of bad BOV.
Yea i saw the video, thats what got me looking at other threads. Cause i just had my blower rebuilt and i was wondering why i cant get full boost in all the gears like you did. I thought it might be the stock piping and filter of bad BOV.
10-07-2010, 02:36 PM
#37
The only belt slip issues I had where when I dynoed after my engine build. I hadn't tightened the belt enough to prevent the slip. My last dyno with the built engine was only seeing about 11 psi (and still manged 450+ whp). After that session, I did went to town on that tensioner, added VHT to the belt, and did see a over 14psi.
Note that I am SEVERELY overspinning the blower by going north of 7000rpm with a 2.62 pulley.
Note that I am SEVERELY overspinning the blower by going north of 7000rpm with a 2.62 pulley.
Thread
Thread Starter
Forum
Replies
Last Post
ballerchris510
3rd Generation Maxima (1989-1994)
9
09-10-2015 09:35 PM