14.7psi 96%DC 4.67v@MAF 7krpm and third gear has enough!
03-20-2004, 04:39 AM
#1
14.7psi 96%DC 4.67v@MAF 7krpm and third gear has enough!
Yup, I was playing with the BC and getting greedy. She dialed in 14.7 after ~5pulls. After it locked the boost setting I had one more run and at ~7k WOT 14.3psi I heard the scatter and felt the loss of power, darn! I shift into 5th and its still going, motor is ok!!! Oh well I have never used my AAA membership so I pull over and get towed to my house ~25 miles up the road. So time to get a used box and cryo it up! Honestly I did break my abuse rule by going back to back so many times. My theory is that because it could take it the first few time, even had a spike to 16psi, that heat build up weakend third and is the primary reason for failure.
Interestingly enough the WG was full shut after 6500rpm, so .81 AR is way too big and I doubt I could get to more than 15psi.
Interestingly enough the WG was full shut after 6500rpm, so .81 AR is way too big and I doubt I could get to more than 15psi.
03-20-2004, 09:33 AM
#4
Z driver
Join Date: Oct 2003
Location: Toronto
Posts: 61
Originally Posted by MardiGrasMax
Interestingly enough the WG was full shut after 6500rpm, so .81 AR is way too big and I doubt I could get to more than 15psi.
03-20-2004, 01:14 PM
#5
Originally Posted by MardiGrasMax
Yup, I was playing with the BC and getting greedy. She dialed in 14.7 after ~5pulls. After it locked the boost setting I had one more run and at ~7k WOT 14.3psi I heard the scatter and felt the loss of power, darn! I shift into 5th and its still going, motor is ok!!! Oh well I have never used my AAA membership so I pull over and get towed to my house ~25 miles up the road. So time to get a used box and cryo it up! Honestly I did break my abuse rule by going back to back so many times. My theory is that because it could take it the first few time, even had a spike to 16psi, that heat build up weakend third and is the primary reason for failure.
Interestingly enough the WG was full shut after 6500rpm, so .81 AR is way too big and I doubt I could get to more than 15psi.
Interestingly enough the WG was full shut after 6500rpm, so .81 AR is way too big and I doubt I could get to more than 15psi.
03-21-2004, 10:37 AM
#9
Any chance you'll dyno the VQ30 once you get the tranny back together?
Or are you hoping to find the limit of the VQ30 internals and then do the VQ35 short-block?
Sure wish we could get someone to keep uping the boost while keeping timing and AFR healthy until she throws a rod or ?????, just so we know what a VQ30 can handle.
Or are you hoping to find the limit of the VQ30 internals and then do the VQ35 short-block?
Sure wish we could get someone to keep uping the boost while keeping timing and AFR healthy until she throws a rod or ?????, just so we know what a VQ30 can handle.
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03-21-2004, 03:34 PM
#13
Icy, using injector flow math and the MAF voltage reading I estimate it was pushing perhaps 540bhp/460whp. All speculation, I am not claiming that as actual, no flames please.
516cc @ 96%DC 0.60BSFC 58psi FP
Im sorta torn as to what to do next? Just the trans? Thats 1/2 the way to a motor swap. And if a 5spd trans wont take that kinda power whats the point of building a motor? Decisions Decisions!!!
516cc @ 96%DC 0.60BSFC 58psi FP
Im sorta torn as to what to do next? Just the trans? Thats 1/2 the way to a motor swap. And if a 5spd trans wont take that kinda power whats the point of building a motor? Decisions Decisions!!!
thats 4.3 more then what I run on a regular basis. Time to shop for a tranny. Should have not thrown my old one away 
03-21-2004, 08:29 PM
#16
Originally Posted by MardiGrasMax
Icy, using injector flow math and the MAF voltage reading I estimate it was pushing perhaps 540bhp/460whp. All speculation, I am not claiming that as actual, no flames please.
516cc @ 96%DC 0.60BSFC 58psi FP
516cc @ 96%DC 0.60BSFC 58psi FP
I figured it was ~450whp, but don't like OVERstating without crunching the math, 400whp, 450whp, 500whp ALL FUKING NUTS THAT A STOCK VQ CAN TAKE THAT ABUSE~! Awesome...
I *LOVE* these kind of examples, it *PROVES* what a PROPERLY tuned VQ can do. People blowing a few motors at what ~10psi...
350z guys blowing LOTS of motors at 8-9psi SC'd no less.
Im sorta torn as to what to do next? Just the trans? Thats 1/2 the way to a motor swap. And if a 5spd trans wont take that kinda power whats the point of building a motor? Decisions Decisions!!!
I read about cryotreatment process by "300 Below", http://www.300below.com/site/home.html, in Turbo&High-Tech Performance where they treated a turbo for one of those tractor pull lunatics. Anyways, before they'd be lucky to get 6-pulls before the turbo would die, but after they got 140-pulls before signs of a bearing problem. Not sure how that applies to tranny gears, but the picture shows engine blocks, brake rotors, cranks, cams, rods, pistons, and heads.
03-21-2004, 08:52 PM
#17
Member
Join Date: Nov 2003
Posts: 92
Originally Posted by MardiGrasMax
Yup, I was playing with the BC and getting greedy. She dialed in 14.7 after ~5pulls. After it locked the boost setting I had one more run and at ~7k WOT 14.3psi I heard the scatter and felt the loss of power, darn! I shift into 5th and its still going, motor is ok!!! Oh well I have never used my AAA membership so I pull over and get towed to my house ~25 miles up the road. So time to get a used box and cryo it up! Honestly I did break my abuse rule by going back to back so many times. My theory is that because it could take it the first few time, even had a spike to 16psi, that heat build up weakend third and is the primary reason for failure.
Interestingly enough the WG was full shut after 6500rpm, so .81 AR is way too big and I doubt I could get to more than 15psi.
Interestingly enough the WG was full shut after 6500rpm, so .81 AR is way too big and I doubt I could get to more than 15psi.
Has Nigel or Hal blown a tranny at 400+?
My buddy just got a tranny rebuilt and he said that rebuilds are stronger than stock tranny, is this true? What about the maxima 6spd tranny or another tranny swap?
03-21-2004, 09:28 PM
#18
Originally Posted by I30tJim
...Hal blown a tranny at 400+?
Matt, sounds like fun times other than the minor setback there! I was out yesterday on 16psi+juice, it's tooo fun! One thing I wanted to question/comment: "I'm using a Tial 38mm, sorta pushing that a bit."... if it is not even having to vent, why do you say you are pushing it? Look forward to more excitement once you get the new tranny on
03-22-2004, 06:43 AM
#19
Originally Posted by IceY2K1
I figured it was ~450whp, but don't like OVERstating without crunching the math, 400whp, 450whp, 500whp ALL FUKING NUTS THAT A STOCK VQ CAN TAKE THAT ABUSE~! Awesome...
I *LOVE* these kind of examples, it *PROVES* what a PROPERLY tuned VQ can do. People blowing a few motors at what ~10psi...
350z guys blowing LOTS of motors at 8-9psi SC'd no less.Yikes...that is difficult. I have a feeling axles are going to be necessary in your NEAR future also.
I read about cryotreatment process by "300 Below", http://www.300below.com/site/home.html, in Turbo&High-Tech Performance where they treated a turbo for one of those tractor pull lunatics. Anyways, before they'd be lucky to get 6-pulls before the turbo would die, but after they got 140-pulls before signs of a bearing problem. Not sure how that applies to tranny gears, but the picture shows engine blocks, brake rotors, cranks, cams, rods, pistons, and heads.
03-22-2004, 06:45 AM
#20
Originally Posted by hlh0501
yes. I even managed to blow my cryo tranny, 3rd gear, not during a shift...
Matt, sounds like fun times other than the minor setback there! I was out yesterday on 16psi+juice, it's tooo fun! One thing I wanted to question/comment: "I'm using a Tial 38mm, sorta pushing that a bit."... if it is not even having to vent, why do you say you are pushing it? Look forward to more excitement once you get the new tranny on
Matt, sounds like fun times other than the minor setback there! I was out yesterday on 16psi+juice, it's tooo fun! One thing I wanted to question/comment: "I'm using a Tial 38mm, sorta pushing that a bit."... if it is not even having to vent, why do you say you are pushing it? Look forward to more excitement once you get the new tranny on
03-22-2004, 10:22 AM
#23
Supporting Maxima.org Member
Join Date: Jan 2002
Posts: 3,371
Originally Posted by Redmax
Congrats matt!! maybe you need to give rob at nrh a call on the tranny and axles. he will help you out!!! 3016172500
03-22-2004, 02:20 PM
#24
Hal, I could be wrong but I thought the Tial 38mm was rated up to 450bhp? I'll be PMing you for info on the 5th gear swap
Yes 96% Duty Cycle, yes high, but what the heck! 58psi with a 1:1 boost reference. Yes 4.67v on a Z32 MAF.
Yes 96% Duty Cycle, yes high, but what the heck! 58psi with a 1:1 boost reference. Yes 4.67v on a Z32 MAF.
03-22-2004, 04:01 PM
#25
Mardi, I am not really sure about this? Would porting the MAF out a little, could it be possiable to lower the voltage? I am not sure how this works. It seems like if you boost anymore it will be maxed out. Would you have to a dummy MAF and 300Zx MAF is you wanted to go any higher?
03-24-2004, 07:36 AM
#26
He can upgrade to a bigger MAF from a Q45 or split the air stream with a dummy MAF or PVC tube for that matter.
He can boost higher with a FMU, however he'll have a boost referenced system once the MAF is max'd vs. a metered air system, which isn't as reliable/safe.
He can boost higher with a FMU, however he'll have a boost referenced system once the MAF is max'd vs. a metered air system, which isn't as reliable/safe.
Originally Posted by spanishrice
Mardi, I am not really sure about this? Would porting the MAF out a little, could it be possiable to lower the voltage? I am not sure how this works. It seems like if you boost anymore it will be maxed out. Would you have to a dummy MAF and 300Zx MAF is you wanted to go any higher?
03-24-2004, 10:00 AM
#27
Supporting Maxima.org Member
Join Date: Jan 2002
Posts: 3,371
Originally Posted by IceY2K1
He can upgrade to a bigger MAF from a Q45 or split the air stream with a dummy MAF or PVC tube for that matter.
He can boost higher with a FMU, however he'll have a boost referenced system once the MAF is max'd vs. a metered air system, which isn't as reliable/safe.
He can boost higher with a FMU, however he'll have a boost referenced system once the MAF is max'd vs. a metered air system, which isn't as reliable/safe.
03-24-2004, 10:42 AM
#28
It's supposedly 10mm bigger and as long as you compensate via AFC/fuel pressure and/or injector size...shouldn't be a problem.
I've seen BIG turbo 350z promo cars using it.
I've seen BIG turbo 350z promo cars using it.
Originally Posted by subs1000w
any idea on how the Q45 maf is calibrated. would it be close to the z32 since the Q45 uses 8 370cc injectors instead of 6
03-26-2004, 06:16 AM
#33
Originally Posted by Jeff92se
Wow. Ever consider getting the 3rd gear custom machined out of something stronger?
03-26-2004, 07:07 AM
#34
You guys are probably right, I just saw 450+hp packages including the Cobra MAF, so I ASSumed.
Not sure really. I think ANY MAF can be used by JWT, so as long as it goes 0-5V and has a bigger area like the Q45 MAF, JWT should be able to use it.
Not sure really. I think ANY MAF can be used by JWT, so as long as it goes 0-5V and has a bigger area like the Q45 MAF, JWT should be able to use it.
03-26-2004, 07:36 AM
#35
I've heard
Cobra MAF is good up to 350+/-WHP
Z32 500+(apparently...)
I think JWT offers the Cobra MAF for two reasons...ease of install on multiple apps and also because its cheaper and much easier to find than the Z MAF NEW. also I've read the Cobra MAF is pretty easy to recalibrate...look at this graph and how much voltae dropped under load after the recalibration
really good info in this article
http://www.mustangworks.com/articles...tionBlues.html
Cobra MAF is good up to 350+/-WHP
Z32 500+(apparently...)
I think JWT offers the Cobra MAF for two reasons...ease of install on multiple apps and also because its cheaper and much easier to find than the Z MAF NEW. also I've read the Cobra MAF is pretty easy to recalibrate...look at this graph and how much voltae dropped under load after the recalibration
really good info in this article
http://www.mustangworks.com/articles...tionBlues.html
03-26-2004, 07:49 AM
#36
Anything ford is easy to tune.
Ahhh, I have an auto-x video of a BMW with a sequential 6 straight cut gears, god its loud. That is all you hear in the upper rpms. It revs to 9,000 rom though.
A shop that works on a lot of sequential racing trannies told me they could design the 3rd gears with almost a straight cut.
03-26-2004, 02:49 PM
#37
Mardi,
Not sure what you're planning, but here's a '00 5spd w/65K for sale:
http://forums.maxima.org/showthread.php?t=297155
Not sure what you're planning, but here's a '00 5spd w/65K for sale:
http://forums.maxima.org/showthread.php?t=297155
Originally Posted by MardiGrasMax
I have but can only imagine how much it would cost, does any one have a clue?
03-27-2004, 05:08 AM
#39
Originally Posted by IceY2K1
Mardi,
Not sure what you're planning, but here's a '00 5spd w/65K for sale:
http://forums.maxima.org/showthread.php?t=297155
Not sure what you're planning, but here's a '00 5spd w/65K for sale:
http://forums.maxima.org/showthread.php?t=297155