Vortech Pros: Upgrading the vortech, cog or pulley?
06-05-2009, 01:34 PM
#41
mean u'll be banging off the rev limiter pretty easily when you are driving hard.
Ya there are gains, but the 20 hp is not worth losing that much rpms at the top. Its not a linear curve between boost and rpm. As rpms increase, the differences get much bigger, and its only til after about 4000 rpm that the differences get wide enough to even feel on the street.
Its only like 10hp per psi. so its not very significant if you can 1 psi at 2000 rpms. and 2 psi more at 4000 rpms.
Ya there are gains, but the 20 hp is not worth losing that much rpms at the top. Its not a linear curve between boost and rpm. As rpms increase, the differences get much bigger, and its only til after about 4000 rpm that the differences get wide enough to even feel on the street.
Its only like 10hp per psi. so its not very significant if you can 1 psi at 2000 rpms. and 2 psi more at 4000 rpms.
06-05-2009, 02:41 PM
#42
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Thanks for the info guys.
The 2.87 pulley 32/28 is better power band for the vq35de, due to the fact it is made to perform better at 7k then compare to 6k. Also the drivability is more enjoyable at a high end power band then compare to a low end when you running hard on the street.
Long story short regardless what cog I put or the pulley I go with. The power will come in at 4k its up to me/you on how wide you want your power band to be. Correct me if i am wrong.
The 2.87 pulley 32/28 is better power band for the vq35de, due to the fact it is made to perform better at 7k then compare to 6k. Also the drivability is more enjoyable at a high end power band then compare to a low end when you running hard on the street. Long story short regardless what cog I put or the pulley I go with. The power will come in at 4k its up to me/you on how wide you want your power band to be. Correct me if i am wrong.
06-05-2009, 06:47 PM
#43
so anyone know how much extra psi u will see with the 34T and 28 vs the stock 32T and 28? If u guys do the calculations, changing to a bigger cog pulley causes less overspinning vs getting the 2.87 pulley. I wondering if it will still net the same gains tho and will the cog belt ripe ezier?
06-05-2009, 08:12 PM
#44
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3.12 pulley gives the blower 50k rpms
3.12 pulley with the 34/28 cog gives the blower 52k rpms
2.87 pulley gives the blower 54k rpms both redline at 6600 rmps
Every 4k rpms give you 2 psi so from what I read. If the cog only gives the blower 2k rpms. Then the cog will give you no more then 1 psi that can equal to 10-15 whp. Thats just my guess.
As far as the belt ripping I simple don't know.
3.12 pulley with the 34/28 cog gives the blower 52k rpms
2.87 pulley gives the blower 54k rpms both redline at 6600 rmps
Every 4k rpms give you 2 psi so from what I read. If the cog only gives the blower 2k rpms. Then the cog will give you no more then 1 psi that can equal to 10-15 whp. Thats just my guess.
As far as the belt ripping I simple don't know.
Last edited by tgunsg35; 06-05-2009 at 08:20 PM.
06-06-2009, 03:16 AM
#45
Goin to the 34t over the 32t is the exact same as dropping 1/4" off your pulley.
just start looking at it based on impeller speed as boost is tied directly to that.
if your car makes 8 psi at 35,000 impeller rpm, it doesnt matter what cog/pulley combo you use to get there. That is fixed.
cogs/pulleys are just there to manipulate the powerband.
a 34/28/2.87 at 6400rpm will make the exact same boost as a 32/28/3.12 at 7400 rpms on the same blower.
Thats where you have to start calc where you cam efficiency is, etc. With aftermarket cams, its prolly better to spread out that rpm range since you can rev to 7400 pretty easily. Since you are already overspinning your T-trim at 7000 rpms, it looks like ~520 hp is the max that blower will support without pushing the impeller more than non-slipping 58000 rpms the impeller is moving now.
So in your case you could use a 3.33 stock pulley with a 32/28 and spin to 8100 rpms and make the same boost and the same power if you cams/heads were meant to operate at that rpm
But the rebuild is only 400$, i'd slap a 2.62 on that baby and see what she does! Iron-Mike might still have his for sale
just start looking at it based on impeller speed as boost is tied directly to that.
if your car makes 8 psi at 35,000 impeller rpm, it doesnt matter what cog/pulley combo you use to get there. That is fixed.
cogs/pulleys are just there to manipulate the powerband.
a 34/28/2.87 at 6400rpm will make the exact same boost as a 32/28/3.12 at 7400 rpms on the same blower.
Thats where you have to start calc where you cam efficiency is, etc. With aftermarket cams, its prolly better to spread out that rpm range since you can rev to 7400 pretty easily. Since you are already overspinning your T-trim at 7000 rpms, it looks like ~520 hp is the max that blower will support without pushing the impeller more than non-slipping 58000 rpms the impeller is moving now.
So in your case you could use a 3.33 stock pulley with a 32/28 and spin to 8100 rpms and make the same boost and the same power if you cams/heads were meant to operate at that rpm
But the rebuild is only 400$, i'd slap a 2.62 on that baby and see what she does! Iron-Mike might still have his for sale
Last edited by str8dum1; 06-06-2009 at 03:25 AM.
06-06-2009, 06:28 AM
#46
Goin to the 34t over the 32t is the exact same as dropping 1/4" off your pulley.
just start looking at it based on impeller speed as boost is tied directly to that.
if your car makes 8 psi at 35,000 impeller rpm, it doesnt matter what cog/pulley combo you use to get there. That is fixed.
cogs/pulleys are just there to manipulate the powerband.
a 34/28/2.87 at 6400rpm will make the exact same boost as a 32/28/3.12 at 7400 rpms on the same blower.
Thats where you have to start calc where you cam efficiency is, etc. With aftermarket cams, its prolly better to spread out that rpm range since you can rev to 7400 pretty easily. Since you are already overspinning your T-trim at 7000 rpms, it looks like ~520 hp is the max that blower will support without pushing the impeller more than non-slipping 58000 rpms the impeller is moving now.
So in your case you could use a 3.33 stock pulley with a 32/28 and spin to 8100 rpms and make the same boost and the same power if you cams/heads were meant to operate at that rpm
But the rebuild is only 400$, i'd slap a 2.62 on that baby and see what she does! Iron-Mike might still have his for sale
just start looking at it based on impeller speed as boost is tied directly to that.
if your car makes 8 psi at 35,000 impeller rpm, it doesnt matter what cog/pulley combo you use to get there. That is fixed.
cogs/pulleys are just there to manipulate the powerband.
a 34/28/2.87 at 6400rpm will make the exact same boost as a 32/28/3.12 at 7400 rpms on the same blower.
Thats where you have to start calc where you cam efficiency is, etc. With aftermarket cams, its prolly better to spread out that rpm range since you can rev to 7400 pretty easily. Since you are already overspinning your T-trim at 7000 rpms, it looks like ~520 hp is the max that blower will support without pushing the impeller more than non-slipping 58000 rpms the impeller is moving now.
So in your case you could use a 3.33 stock pulley with a 32/28 and spin to 8100 rpms and make the same boost and the same power if you cams/heads were meant to operate at that rpm
But the rebuild is only 400$, i'd slap a 2.62 on that baby and see what she does! Iron-Mike might still have his for sale
06-06-2009, 07:22 AM
#47
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I was going off of the nonrev v2 LOL. I should of asked which trim before doing the resreach. Good luck with the 2.62 hope to see that dyno chart soon.
Last edited by tgunsg35; 06-06-2009 at 07:25 AM.
06-06-2009, 07:59 AM
#48
ya, sending parts thru the motor would be bad. There definitely pics of when people's bearings went on the older V2s where there were pieces of impeller all the way thru the intercooler.
At those rpms, i bet the bearings start to float as well which would cause the impeller to crash into the volute. hello rebuild.
does your T-trim have a carb cert # on it? i've been reading on the ysi on the stang forums and being able to bolt that right up in our car makes it an attractive upgrade at ~3k new. sell your t-trim for like 1500$
At those rpms, i bet the bearings start to float as well which would cause the impeller to crash into the volute. hello rebuild.
does your T-trim have a carb cert # on it? i've been reading on the ysi on the stang forums and being able to bolt that right up in our car makes it an attractive upgrade at ~3k new. sell your t-trim for like 1500$
06-06-2009, 03:12 PM
#49
ya, sending parts thru the motor would be bad. There definitely pics of when people's bearings went on the older V2s where there were pieces of impeller all the way thru the intercooler.
At those rpms, i bet the bearings start to float as well which would cause the impeller to crash into the volute. hello rebuild.
does your T-trim have a carb cert # on it? i've been reading on the ysi on the stang forums and being able to bolt that right up in our car makes it an attractive upgrade at ~3k new. sell your t-trim for like 1500$
At those rpms, i bet the bearings start to float as well which would cause the impeller to crash into the volute. hello rebuild.
does your T-trim have a carb cert # on it? i've been reading on the ysi on the stang forums and being able to bolt that right up in our car makes it an attractive upgrade at ~3k new. sell your t-trim for like 1500$
07-11-2009, 09:56 AM
#53
3.12 pulley gives the blower 50k rpms
3.12 pulley with the 34/28 cog gives the blower 52k rpms
2.87 pulley gives the blower 54k rpms both redline at 6600 rmps
Every 4k rpms give you 2 psi so from what I read. If the cog only gives the blower 2k rpms. Then the cog will give you no more then 1 psi that can equal to 10-15 whp. Thats just my guess.
As far as the belt ripping I simple don't know.
3.12 pulley with the 34/28 cog gives the blower 52k rpms
2.87 pulley gives the blower 54k rpms both redline at 6600 rmps
Every 4k rpms give you 2 psi so from what I read. If the cog only gives the blower 2k rpms. Then the cog will give you no more then 1 psi that can equal to 10-15 whp. Thats just my guess.
As far as the belt ripping I simple don't know.
iF those impeller speeds are correct then a lot of the ppl using the sc trim with 2.87 pulley are overspinning their blower at 54K rpm while their blower is rated for only 50K. So does that mean with the t trim I can spin it around 60K rpm and still be okay?
09-24-2009, 01:27 PM
#56
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haven't posted in awhile but I'm getting my vortech back from the customer I sold it to and will be installing it in Dec. I have a new 2.87 pulley for it and will be running 34/28 tooth cog pullies with it along with a host of other mods including the upgraded impeller that has a 60,000rpm ceiling.
this thread has been a very interesting read so far and just wanted to say hi and let you guys know I'm back LOL
carry on
this thread has been a very interesting read so far and just wanted to say hi and let you guys know I'm back LOL
carry on
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