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.

 

YOU BETTA BE CAREFUL ****!!!!

 

You Greedy power hungry bastid! Nice Job ;-)

 

Wow thats pretty crazy. What kind of wastegate does your setup used? I had a peak at your car/site, pretty crazy setup you have there. Nice tire choice too btw... (M&H)

 

At least it was just a trans and not an engine!

 

*DYNO*DYNO*DYNO*

Before she blows~!

 

I thought matt dyno'd in 3rd gear?..lol


Better that then the motor, I think.

How many back to back to back runs?

 

I'm using a Tial 38mm, sorta pushing that a bit.

I think is was six, plus a few about 15min before that.

 

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.

 

this is just nuts

you know that thing was making some serious power if it stripped a gear while acclerating

 

Over 400whp and I can only imagine the torque.

 

Mardi - your engine should be the king of all VQs...did you do a compression test recently?

14.7psi....dang! I will love to see the dyno on this one!

 

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!!!

 

14PSI 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

 

I just can't believe you were running 14 psi on stock motor. That makes me happy on thinking I can run that kind of boost on a stock motor.

 

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.

 

Man thats too bad,
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?

 

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

 

I read the same thing in Turbo magazine last month I think. Pretty interesting.

 

You didn't sell your car?

 

Congrats matt!! maybe you need to give rob at nrh a call on the tranny and axles. he will help you out!!! 3016172500

 

When you say 96%DC, are you referring to IDC? If so,that is damn high and maxed out. Are you at 58psi static?

Just curious,are you hitting 4.67volts on the MAF at redline?

 

i thought NRH only beefs fluid driven trannys (you know what i mean but i cant think of the proper term)

 

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.

 

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?

 

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.

 

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

 

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.

 

Also, Mardi can easily have JWT program his ECU for the Cobra MAF they offer.

 

From what I can tell the Z MAF can handle more then the Cobra MAF that JWT calls for.

 

Wow. Ever consider getting the 3rd gear custom machined out of something stronger?

 

Thats what I thought too.

 

I have but can only imagine how much it would cost, does any one have a clue?

 

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.

 

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

 

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.

 

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

 

Yeah the Z maf is around 560hp while the cobra is 450hp or so.

 

I have a spare that has bad input bearings and a cracked case, Ive had it for a while. I just need to strip it down and send the parts to get cryoed and shotpeened. I have a Turbo mag that shows a SER trans build up, they give some great pointers for deburing etc... Its on my bench now.

 

Yeah, I forgot about that article.

How much difference do you think cryo, shot-peening, and deburing can make?