Gearbox options/experiences - Page 17 - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


Race Prep Miata race-only chat.
Sponsored by:
Sponsored by:

Reply
 
 
 
LinkBack Thread Tools Search this Thread
Old 06-25-2014, 12:30 AM   #321
Elite Member
 
Join Date: Jul 2005
Location: Anacortes, WA
Posts: 2,443
Total Cats: 109
Default

Quote:
Originally Posted by TNTUBA View Post
Have you all actually laid hands on that quicktime bellhousing for the BP? That thing is made out of led. My current trans is lighter than the T101A and that Bellhousing was. Just saying....Ive had both setups on the scales.
Curios what rear end ratio you’re using with the Quaife gear set for autocross. I assume it’s the wide. By my calculations and experiences I think I would want a 4.875 definitely not more than a 4.44. Stock 5 speed with a 3.909 was too tall in second I got significantly faster with a 6 speed 3.636 second gear combo plus turning up the revs to get barely enough top speed. But throttle response and torque is instantly available at all the places on an autocross course that you want it that way. Reaching 73 mph bouncing off the rev limiter for a short bit versus 68 doesn’t mean **** for lap time if you’re loosing any acceleration and throttle response off the 30mph corner to get it.

Quaife wide 2nd through 5th looks very close to 3rd through 6th on the stock 6 speed and 1st is a little taller than mid-way between 1st and second on the stock 6 speed. This is Excellent track gearing! Totally useless on the track if you select the proper rear end gear it for autocross in my opinion.

Maybe I just need two rear ends and add rear carrier swap that to my growing list of swap parts to run both disciplines with the same car. Add another couple grand to the cost of using a Quaife.
bbundy is offline   Reply With Quote
Old 06-25-2014, 12:39 AM   #322
Junior Member
iTrader: (2)
 
Join Date: Apr 2011
Posts: 360
Total Cats: 10
Default

Wide set, 4.3 rear end. 8000 rpms = 75 in 2nd.
codingparadox is offline   Reply With Quote
Old 06-25-2014, 02:23 AM   #323
Elite Member
 
Join Date: Jul 2005
Location: Anacortes, WA
Posts: 2,443
Total Cats: 109
Default

Quote:
Originally Posted by codingparadox View Post
Wide set, 4.3 rear end. 8000 rpms = 75 in 2nd.
That's almost Identical 2nd gear to a stock 5 speed with a 3.909. my car bogged a lot out of slow autocross corners with that gear which in turn prompted a lot of initial over application of throttle pedal followed shortly thereafter by too much wheel spin and the feeling you were going to lose control and crash when the power comes on. With my current gearing it never bogs in second if the car is rolling at all. Power response to pedal movement stays fairly instant and linear.

I'm thinking maybe another 5mph worth of gear at the top of second than what I have might be good 10 is definitely too much for my power delivery to stay in the sweet spot.
bbundy is offline   Reply With Quote
Old 06-25-2014, 05:08 AM   #324
Senior Member
iTrader: (1)
 
Join Date: Jan 2011
Location: Chattanooga, Tn
Posts: 992
Total Cats: 119
Default

Quote:
Originally Posted by codingparadox View Post
Wide set, 4.3 rear end. 8000 rpms = 75 in 2nd.
What that guy said. But I only spin my motor 7700
TNTUBA is offline   Reply With Quote
Old 06-25-2014, 05:12 AM   #325
Senior Member
iTrader: (1)
 
Join Date: Jan 2011
Location: Chattanooga, Tn
Posts: 992
Total Cats: 119
Default

Quote:
Originally Posted by hankclaussen View Post
I could get on board with it, the rating and that there have been failures worry me. I would have a conniption fit if it broke after all that because then it would have made more sense to go all in on a $8k custom whatever else we're looking at.


In my case a tko600 with a .82 5th was brought to my attention and wouldn't be the worst thing in the world though there's a lot of fabrication involved compared to what I want to do (none), but zero worries about power.
There is no such thing as a racing part that wont eventually break. I have seen Jerico transmissions shatter gears at 1/2 of the power for which they are rated.
TNTUBA is offline   Reply With Quote
Old 06-25-2014, 07:17 AM   #326
Elite Member
iTrader: (1)
 
Leafy's Avatar
 
Join Date: Jun 2012
Location: NH
Posts: 8,814
Total Cats: 92
Default

Quote:
Originally Posted by bbundy View Post
That's almost Identical 2nd gear to a stock 5 speed with a 3.909. my car bogged a lot out of slow autocross corners with that gear which in turn prompted a lot of initial over application of throttle pedal followed shortly thereafter by too much wheel spin and the feeling you were going to lose control and crash when the power comes on. With my current gearing it never bogs in second if the car is rolling at all. Power response to pedal movement stays fairly instant and linear.

I'm thinking maybe another 5mph worth of gear at the top of second than what I have might be good 10 is definitely too much for my power delivery to stay in the sweet spot.
Bob you're talking two guys with twin screws that make over 200ftlbs starting at idle.
Leafy is offline   Reply With Quote
Old 06-25-2014, 09:11 AM   #327
Junior Member
iTrader: (5)
 
hankclaussen's Avatar
 
Join Date: Mar 2010
Location: Houston
Posts: 364
Total Cats: 56
Default

Quote:
Originally Posted by TNTUBA View Post

There is no such thing as a racing part that wont eventually break. I have seen Jerico transmissions shatter gears at 1/2 of the power for which they are rated.
Sure but I don't think the Quaife is taking 500ft/lbs very well, this other one is designed for it. Not that I'm going to make that.
hankclaussen is offline   Reply With Quote
Old 06-25-2014, 11:42 AM   #328
Elite Member
 
Join Date: Jul 2005
Location: Anacortes, WA
Posts: 2,443
Total Cats: 109
Default

Quote:
Originally Posted by Leafy View Post
Bob you're talking two guys with twin screws that make over 200ftlbs starting at idle.
I make 200 ft-lbs at 3100 rpm but Over 300 by 4200 rpm till about 7200 where it slowly tapers down. Car is substantially faster if it stays above 4000 rpm off slow corners and much easier to drive staying away from transitioning through the rapid torque rise part of the curve.
bbundy is offline   Reply With Quote
Old 06-25-2014, 06:27 PM   #329
Elite Member
 
Join Date: Jul 2005
Location: Anacortes, WA
Posts: 2,443
Total Cats: 109
Default

Quote:
Originally Posted by Leafy View Post
Bob you're talking two guys with twin screws that make over 200ftlbs starting at idle.
Codingparadox versus my dyno plot, same dyno same tuner. David is using E85, Im using pump gas. And that dyno pull for me is at my 20 psi boost cut. I run 18-19PSI for autocross so take out 10 to 15 off the numbers on my plot. ~14PSI for NASA TT2 to get right around 330 hp. I make a boatload more torque ~50 ft-lbs but to keep the car in the controllable flat torque curve part of the plot slow corners need to be taken at 4000 rpm or better.



bbundy is offline   Reply With Quote
Old 06-25-2014, 06:29 PM   #330
Junior Member
iTrader: (2)
 
Join Date: Apr 2011
Posts: 360
Total Cats: 10
Default

The point of the above statement was simply that we have linear/controllable torque from as low as needed, so we can make our gearing as wide as we want.
codingparadox is offline   Reply With Quote
Old 06-25-2014, 07:04 PM   #331
Elite Member
 
Join Date: Jul 2005
Location: Anacortes, WA
Posts: 2,443
Total Cats: 109
Default

Quote:
Originally Posted by codingparadox View Post
The point of the above statement was simply that we have linear/controllable torque from as low as needed, so we can make our gearing as wide as we want.
With my power curve I have become a gearing snob. I'd hate to spend a shitload of money and have my car be slower.
bbundy is offline   Reply With Quote
Old 06-25-2014, 07:14 PM   #332
Elite Member
iTrader: (1)
 
Leafy's Avatar
 
Join Date: Jun 2012
Location: NH
Posts: 8,814
Total Cats: 92
Default

Quote:
Originally Posted by bbundy View Post
With my power curve I have become a gearing snob. I'd hate to spend a shitload of money and have my car be slower.
They have different gearing requirements than us. We want a 7.74 total gear reduction, they want 7.04ish. Thats the difference between having a 8500rpm redline and a 7500 rpm redline with matching powerbands for both.
Leafy is offline   Reply With Quote
Old 06-25-2014, 08:11 PM   #333
Senior Member
iTrader: (1)
 
Join Date: Jan 2011
Location: Chattanooga, Tn
Posts: 992
Total Cats: 119
Default

Que the pointless Supercharger vs Turbo pissing contest.
TNTUBA is offline   Reply With Quote
Old 06-25-2014, 11:58 PM   #334
Elite Member
iTrader: (1)
 
Leafy's Avatar
 
Join Date: Jun 2012
Location: NH
Posts: 8,814
Total Cats: 92
Default

Quote:
Originally Posted by TNTUBA View Post
Que the pointless Supercharger vs Turbo pissing contest.
My redline's higher than your redline.
Leafy is offline   Reply With Quote
Old 08-23-2014, 02:25 AM   #335
Junior Member
iTrader: (8)
 
Join Date: Jul 2008
Location: Portland, OR
Posts: 396
Total Cats: 9
Default

Emilio, any updates on the 6 speed gearset?
kaisersoze is offline   Reply With Quote
Old 08-23-2014, 05:47 PM   #336
Supporting Vendor
iTrader: (3)
 
emilio700's Avatar
 
Join Date: May 2005
Posts: 4,757
Total Cats: 922
Default

Quote:
Originally Posted by kaisersoze View Post
Emilio, any updates on the 6 speed gearset?
I would not keep it a secret. We're building a 350whp track car that could certainly use such a trans so my interest is very specific now.
emilio700 is offline   Reply With Quote
Old 08-24-2014, 11:02 AM   #337
Junior Member
iTrader: (8)
 
Join Date: Jul 2008
Location: Portland, OR
Posts: 396
Total Cats: 9
Default

Quote:
Originally Posted by emilio700 View Post
I would not keep it a secret. We're building a 350whp track car that could certainly use such a trans so my interest is very specific now.
Great, just wanted to know if you were still moving forward with the gearset so I can continue to wait, instead of saving up for the PAR gearset or the Richmond 6 speed.
Thanks for taking this on
kaisersoze is offline   Reply With Quote
Old 08-24-2014, 12:42 PM   #338
Elite Member
 
Join Date: Jul 2005
Location: Anacortes, WA
Posts: 2,443
Total Cats: 109
Default

Quote:
Originally Posted by emilio700 View Post
I would not keep it a secret. We're building a 350whp track car that could certainly use such a trans so my interest is very specific now.
Keep me posted. I could certainly put such a gearset to the test.
bbundy is offline   Reply With Quote
Old 08-24-2014, 01:45 PM   #339
Junior Member
 
Join Date: Aug 2009
Location: Sun Prairie WI
Posts: 50
Total Cats: 1
Default

I am also eagerly awaiting a 949 custom gearsets. Thank you Emilio in advance for your hard work getting one put together.��
92mazdaspeed is offline   Reply With Quote
Old 08-24-2014, 11:36 PM   #340
Junior Member
iTrader: (2)
 
Join Date: Apr 2011
Posts: 360
Total Cats: 10
Default

I'm about to also have a low miles 5-speed box with Quaife gearset installed and proven to hold power for sale in around a month, for people who need a solution sooner. ;-)
codingparadox is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Removing speedo sensor from gearbox ThunderFox Suspension, Brakes, Drivetrain 2 09-10-2015 03:19 PM
Loud gearbox vibration rhysmate Suspension, Brakes, Drivetrain 9 08-12-2012 05:43 PM
DIY gearbox rx-7fd 3s with the first side oem gearbox dogits DIY Turbo Discussion 18 03-09-2011 05:18 AM
difference automatic gearbox NA Lazy_g General Miata Chat 2 04-14-2010 03:07 PM
Nissan SR-20DET engine into Miata Big Al General Miata Chat 2 05-23-2008 11:17 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 07:07 AM.