Supercharger Dual Throttle Project - Page 3 - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


Supercharger Discussion For all you misguided souls.
Sponsored by:
Sponsored by:

Reply
 
 
 
LinkBack Thread Tools Search this Thread
Old 04-17-2010, 10:04 PM   #41
Senior Member
iTrader: (1)
 
Join Date: Oct 2009
Posts: 1,436
Total Cats: 58
Default

What do you guys use for the second throttle cable? Is it all DIY, or are there kits out there to start at?
Enginerd is offline   Reply With Quote
Old 04-21-2010, 10:54 AM   #42
Junior Member
Thread Starter
iTrader: (1)
 
Join Date: Apr 2007
Location: Toronto, Canada
Posts: 455
Total Cats: 18
Default

Quote:
Originally Posted by cymx5 View Post
What do you guys use for the second throttle cable? Is it all DIY, or are there kits out there to start at?
You can use an OEM throttle cable and modify one end. It depends on your preferred cable routing.
The trick is the interface between the cables. As Godless Commie pointed out, cracking the supercharger throttle means that there is an exaggerated difference in cable travel length between idle to WOT of each throttle. He had an interface wheel made up. I drilled an oversize hole in my wheel which gave me the ability to cam it and compensate for the difference.
BarbyCar is offline   Reply With Quote
Old 04-21-2010, 10:58 AM   #43
Elite Member
iTrader: (2)
 
Join Date: Jun 2009
Location: Istanbul, Turkey
Posts: 2,050
Total Cats: 433
Default

I removed one coilspring from the stock TB.
Made no difference in the way the butterfly operates, but the pedal is much lighter now.
Godless Commie is offline   Reply With Quote
Old 04-21-2010, 11:06 AM   #44
Junior Member
Thread Starter
iTrader: (1)
 
Join Date: Apr 2007
Location: Toronto, Canada
Posts: 455
Total Cats: 18
Default

Quote:
Originally Posted by Godless Commie View Post
I removed one coilspring from the stock TB.
Made no difference in the way the butterfly operates, but the pedal is much lighter now.
I removed one spring rotation from each throttle and it feels nice and stocky.
BarbyCar is offline   Reply With Quote
Old 05-02-2010, 01:15 PM   #45
Junior Member
Thread Starter
iTrader: (1)
 
Join Date: Apr 2007
Location: Toronto, Canada
Posts: 455
Total Cats: 18
Default

Dyno Dragon Parallel wiring

Mods please move to sticky, I don't have access.
Attached Thumbnails
Supercharger Dual Throttle Project-cooling_fans_modified_451.jpg  
BarbyCar is offline   Reply With Quote
Old 05-02-2010, 05:18 PM   #46
Elite Member
iTrader: (7)
 
Join Date: Jul 2009
Location: Gainesville,Fl
Posts: 3,354
Total Cats: 7
Default

Thanks Barbycar!
turotufas is offline   Reply With Quote
Old 05-02-2010, 05:46 PM   #47
Elite Member
iTrader: (2)
 
Join Date: Jun 2009
Location: Istanbul, Turkey
Posts: 2,050
Total Cats: 433
Default

Quote:
Originally Posted by BarbyCar View Post
Dyno Dragon Parallel wiring
I just installed a relay powered from the underhood fuse box, and spliced into & ran the 12V signal from the primary fan as a trigger to that relay for the second fan. Second fan and the relay share a common ground, bolted to the chassis.
Five minute job, $3 relay.

The relay is in the lower right part of the picture.
Attached Thumbnails
Supercharger Dual Throttle Project-dsc08379.jpg  
Godless Commie is offline   Reply With Quote
Old 05-02-2010, 11:15 PM   #48
I'm Miserable!
 
Join Date: Apr 2010
Location: Alberta, Canada
Posts: 135
Total Cats: -23
Default has anyone ever tried...

mounting the dummy throttle body to the S/C inlet and leaving the stock throttle body in it's original position, as opposed to using the second throttle body? Would using the dummy throttle body in combination with the existing air intake piping be quiet enough?

This is probably a dumb question, but thought I would ask

Jim
jimj64 is offline   Reply With Quote
Old 05-03-2010, 08:57 AM   #49
Elite Member
iTrader: (1)
 
Join Date: Jun 2006
Location: Warrington/Birmingham
Posts: 2,658
Total Cats: 39
Default

yes plenty of times, its VERY VERY VERY loud
richyvrlimited is offline   Reply With Quote
Old 05-03-2010, 10:42 AM   #50
I'm Miserable!
 
Join Date: Apr 2010
Location: Alberta, Canada
Posts: 135
Total Cats: -23
Default

Quote:
Originally Posted by richyvrlimited View Post
yes plenty of times, its VERY VERY VERY loud
I figured that was the answer, but it didn't hurt to ask
jimj64 is offline   Reply With Quote
Old 05-03-2010, 10:55 AM   #51
Junior Member
Thread Starter
iTrader: (1)
 
Join Date: Apr 2007
Location: Toronto, Canada
Posts: 455
Total Cats: 18
Default

Quote:
Originally Posted by jimj64 View Post
I figured that was the answer, but it didn't hurt to ask
I've heard it described as being like an Apache helicopter's 20mm cannon.
BarbyCar is offline   Reply With Quote
Old 05-03-2010, 05:47 PM   #52
Junior Member
iTrader: (2)
 
Join Date: Mar 2008
Location: Irvine, Ca
Posts: 277
Total Cats: 23
Default

Stock TB location is pretty loud. I know since i have my car set up that way.

cjsafski is offline   Reply With Quote
Old 07-13-2010, 12:33 PM   #53
Senior Member
 
steelrat's Avatar
 
Join Date: Jul 2005
Posts: 514
Total Cats: 0
Default

So finally got the dual tb installed on the weekend....

Running without any recirc at this point, however, I think I'm going to try one.... I'm wondering if extra boost the stock 4-rib pulleys the bypass valve will be enough.

Stock idle, is a wonderful thing. If you add load (turn the lights on, or whatever else, it doesn't dip or do anything.)

So after working with Barby's car we've modified the pulley wheel for both throttles to help make sure the offset is included. At this time, it seems to be working well with the two stock TBs that I'm running. With the new TB in the stock location, I had to adjust the idle set screw after the install. But given this was from another car, I'm not surprised. The blower TB hasn't been adjusted, but I'm curious if I need to adjust the stop a little higher or not yet.

Also I've found that I needed to add the restricter pill back into the bypass. Originally I had it removed to help with the boost/off-boost transition, back when the kit was new. I found at this point, the faster transition was hurting the near 0 vac was making it stumble a bit on grades without going into boost.

Also finding I have to relearn the car, the throttle response, and more importantly just the little things like decel are completely different.

At this point I'm thinkin' all hotsides should be dual tbs... <G>

Dave,
steelrat is offline   Reply With Quote
Old 07-13-2010, 11:03 PM   #54
Junior Member
Thread Starter
iTrader: (1)
 
Join Date: Apr 2007
Location: Toronto, Canada
Posts: 455
Total Cats: 18
Default

Quote:
Originally Posted by steelrat View Post
Also I've found that I needed to add the restricter pill back into the bypass. Originally I had it removed to help with the boost/off-boost transition, back when the kit was new. I found at this point, the faster transition was hurting the near 0 vac was making it stumble a bit on grades without going into boost.
Two things:
Fix that vacuum leak on the signal modifier.
Try the signal modifier at 2" vacuum and reduce the volts.
BarbyCar is offline   Reply With Quote
Old 07-13-2010, 11:42 PM   #55
Junior Member
iTrader: (1)
 
Join Date: Jan 2008
Location: Oahu, Hawaii
Posts: 87
Total Cats: 1
Default

I finally got to autox my dual throttle setup yesterday and everything ran perfectly. I forgot how much of a PITA it was having to deal with throttle dip. The car now idles perfectly and transitions much quicker. It is a pleasure to drive again.
EvoRoadster is offline   Reply With Quote
Old 07-14-2010, 11:14 AM   #56
Senior Member
 
steelrat's Avatar
 
Join Date: Jul 2005
Posts: 514
Total Cats: 0
Default

Quote:
Originally Posted by BarbyCar View Post
Two things:
Fix that vacuum leak on the signal modifier.
Try the signal modifier at 2" vacuum and reduce the volts.
Vac leak is a work in progress. <G> Need to get the new pressure switch first. Second.... the switch I have/ordered works the same, in 0.5-1psi on boost....

The voltage for the clamp was set properly before, but I can throw a DVM on it and see to make sure it hasn't shifted. <G>

Dave,
steelrat is offline   Reply With Quote
Old 07-15-2010, 10:56 AM   #57
Junior Member
 
Join Date: Dec 2009
Location: ON, Canada
Posts: 106
Total Cats: 2
Default

Steelrat I've got a few questions for you.

1) Did you buy the extra TB pulley from the UK supplier or are you using the existing pulleys (i.e. does the TB in the stock location have an additional pulley mated to it)?

2) What did you do about a throttle cable between the two TB's? Did you get a custom made cable?

3) What do you mean when you say you modified the pulley wheel? When you mention offset are you referring to an eccentric pulley configuration (pulley axle not in its center)?
Staffah is offline   Reply With Quote
Old 07-15-2010, 11:21 AM   #58
Junior Member
Thread Starter
iTrader: (1)
 
Join Date: Apr 2007
Location: Toronto, Canada
Posts: 455
Total Cats: 18
Default

I can answer these for the Rat

1) The pulley is a rough mockup of my redesign of the UK pulley. It is an additional pulley. Once we know that everything is good - a few miles travelled and some autoX runs we'll get a few production quality pulleys made.

2) The throttle cable is made up locally in Toronto to my dimensions and runs around the rear of the engine.

3) The modification was to machine two different radius on the same pulley face allowing the supercharger TB to be cracked open at idle and having both throttles hit WOT together.

GodlessCommie did something similar by having his second pulley be a reduced diameter. See above in this thread.
Quote:
Originally Posted by Staffah View Post
Steelrat I've got a few questions for you.

1) Did you buy the extra TB pulley from the UK supplier or are you using the existing pulleys (i.e. does the TB in the stock location have an additional pulley mated to it)?

2) What did you do about a throttle cable between the two TB's? Did you get a custom made cable?

3) What do you mean when you say you modified the pulley wheel? When you mention offset are you referring to an eccentric pulley configuration (pulley axle not in its center)?
BarbyCar is offline   Reply With Quote
Old 07-15-2010, 11:53 AM   #59
Elite Member
iTrader: (2)
 
Join Date: Jun 2009
Location: Istanbul, Turkey
Posts: 2,050
Total Cats: 433
Default

Quote:
Originally Posted by BarbyCar View Post

GodlessCommie did something similar by having his second pulley be a reduced diameter. See above in this thread.
I had to have a reduced diameter..
I have the BBK big throttle body on my SC, and that butterfly requires a lot LESS cable movement as compared to the stock pulley.
Godless Commie is offline   Reply With Quote
Old 07-15-2010, 12:21 PM   #60
Senior Member
 
steelrat's Avatar
 
Join Date: Jul 2005
Posts: 514
Total Cats: 0
Default

Quote:
Originally Posted by Godless Commie View Post
I had to have a reduced diameter..
I have the BBK big throttle body on my SC, and that butterfly requires a lot LESS cable movement as compared to the stock pulley.
It would seem at the moment the two stock TBs have the same sort of limitation, since you always need the blower tb open a little....

Need to check the throttle position adjustment. My blower might be set "too" open at idle from trying to get it to idle properly with the IC + one tb.

Dave,
steelrat is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Project Gemini - Turbo Civic on the Cheap Full_Tilt_Boogie Build Threads 58 Yesterday 10:04 PM
MP62 maintenance Pist0n Supercharger Discussion 3 10-10-2015 05:23 PM
Expected intake temps on the track? tazswing Race Prep 20 10-03-2015 12:04 PM
New M62 Miata owner Pist0n Meet and Greet 4 10-01-2015 09:18 PM
Time to start learning and play with tuning The Gleas MEGAsquirt 3 10-01-2015 10:30 AM


Tags
btb, dtb, mp62, silicone

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 11:21 AM.