Jump to content
The mkiv Supra Owners Club

Project Supracharger


David P

Recommended Posts

  • Replies 1.9k
  • Created
  • Last Reply

Top Posters In This Topic

The idler bearing/bracket fits like it was made for the job. ;)

 

This will reduce belt-whip and increases wrap on supercharger pulley, with the option of fitting a larger wheel if more wrap is required. :think:

 

With the guard modified and fitted, it looks as though it belongs there. :)

 

I declare this job jobbed, :thumbs: that's one more off the list. :)

 

attachment.php?attachmentid=135060&d=1309011512

 

attachment.php?attachmentid=134990&d=1308861955

sc57 007.JPG

sc57 003.JPG

Edited by David P (see edit history)
Link to comment
Share on other sites

The main pieces of the pulley support bracket are formed and ready for assembly but the adaptor I made is slightly on the wonk. :limp:

 

It was my first go on a lathe and haven't worked out yet how it went wrong, :think: so have asked a pal to use it as a pattern and knock me up a straight version.

 

attachment.php?attachmentid=135023&d=1308946774

sc58 002.JPG

Edited by David P (see edit history)
Link to comment
Share on other sites

That tensioner is a nice bit of work, I like your creative thinking there :thumbs:

 

Sorry to ask a dumb question, but why is a support braket needed for the PAS pulley? Is it due to the extra stress the SC could put on the belt system?

Link to comment
Share on other sites

looking really good. what sort of power output you expecting/hoping for?

 

Thank you for the compliment. :thumbs:

 

Here's the post you missed. ;)

 

6.78” crank pulley / 4.2" supercharger pulley x M112 = 13.56psi (0.93 bar) 711 cfm (20,147 lpm) engine 6,800rpm s.c. 10,977rpm

dynamic compression 16.86:1 (figures allow for valve overlap and @ 95% ve)

 

Along with the water/meth and HHO, I think it could be possible to scrape into the exclusive 500 club.

Edited by David P (see edit history)
Link to comment
Share on other sites

That tensioner is a nice bit of work, I like your creative thinking there :thumbs:

 

Sorry to ask a dumb question, but why is a support braket needed for the PAS pulley? Is it due to the extra stress the SC could put on the belt system?

 

Simple, strong and true. :thumbs: I am pleased with the outcome. :)

 

 

The power steering pump wasn't designed to have 50 bhp of supercharger pull loaded on it, so I'm giving it an additional bearing to support the pulley in double shear. :think:

 

I am asking a lot of the 6-rib belt system that was designed for less demanding accessories, so I am giving it it's best chance. :shrug:

 

Tomorrow I plan to fit the new idler pulley, supercharger bracket/throttle-body assembly and air filter, these can then stay on the car. :)

 

This will allow me to check belt length with the larger ATI crank pulley and progress to fabricate a cold-air filter box.

 

I am working on elements for several of the countdown list jobs.

Edited by David P (see edit history)
Link to comment
Share on other sites

The supercharger bracket, throttle body, induction/air filter and additional belt tensioner are on the car engine to stay. :)

 

Fitting the bracket required removal of the N/A throttle body, distributor, alarm and thermostat housing, yet now it's in, all is well for clearance and function. :thumbs:

 

The Supercharger throttle body is fixed at WOT and the N/A induction is plumbed through it keeping the car operational. :think:

 

attachment.php?attachmentid=135121&d=1309175977

sc59 004.JPG

Edited by David P (see edit history)
Link to comment
Share on other sites

Glad to see some bits making into the cars engine bay now.The idler pulley /bracket is clever.

 

There are lots of little hose and loom tails creeping into there, I have the job 'surrounded' and working towards being as close as possible to a plug & play installation when the big day comes.

 

It is satisfying to install a few of the components into their new homes, which even though made to my own guessmeasury specifications, it remains almost a surprise to find that first time on the car they actually all fit and function without 'issues'. :cool:

 

The new adaptor for the power steering pulley is made, but I need to find another OE steel pulley.

I don't want to use the alloy one I have, as I plan to return to steel for maximum strength, of which I have two, however, one is bent and the other was from a burnt out Supra and is very rusty.

This pulley/bracket needs to be even cleverer. :think:

Edited by David P (see edit history)
Link to comment
Share on other sites

Looking good David, glad you went for a double shear bearing for the PAS pump, they are a bit delicate even when run as intended :) If you were to "productionise" this would it not be easier to have a dedicated crank pulley for the SC and a dedicated belt, forward of the auxiliary belt? The SC would have to be further forward of course.

Link to comment
Share on other sites

The belt and pulleys are an unknown quantity and the 'Achilles heel' of the project. :think:

 

Should this element of the build fail, I will need to upgrade to an 8-rib and maybe also change to dedicated pulleys.

 

First I am beefing up the 6-rib system to give it it's best chance, and see what happens? :shrug:

Edited by David P (see edit history)
Link to comment
Share on other sites

There's no bolt in the end of this one, it's just an interference fit.

Originally there was a plastic button clipped into the end, yet that died some time ago.

 

 

Another full days tinkering, yet not a lot to show for it.

 

The 4" to 3" elbow has been shortened one way and lengthened the other, it is a bit of a clip-fest, but the cold-air box will be easier to fabricate over the straight panels now beneath the filter.

 

I have made some minor modifications to the Lexus throttle body and the Supra throttle position sensor is now set up to read as a stock Supra t.b. and refitted with new gasket.

 

The TPS is now insulated and the wires are routed into the loom across to close to the N/A TPS wires.

 

The rear section of induction insulation is fitted and the HHO feed hose is connected and for now, bundled up next to brake master cylinder.

 

Barney's pulley has arrived, so I can get on with the power steering pump support bearing. :thumbs:

 

attachment.php?attachmentid=135214&d=1309373402

 

attachment.php?attachmentid=135216&d=1309373402

 

attachment.php?attachmentid=135215&d=1309373402

sc60 004.JPG

sc60 005.JPG

sc60 006.JPG

Edited by David P (see edit history)
Link to comment
Share on other sites

Using the aluminium and door seal found at the scrapyard, I knocked-up a cold-air box.

 

It is secured onto 3 OE 6MT fixings and the alugarmi fitted perfectly first time. :cool:

 

There will be a little more work routing the throttle and cruise cables through it when I have some, but think that job is jobbed enough to take it off the list and declare DEFCON 5. :)

 

attachment.php?attachmentid=135385&d=1309718191

 

attachment.php?attachmentid=135384&d=1309718191

sc62 002.JPG

sc62 004.JPG

Edited by David P (see edit history)
Link to comment
Share on other sites

After I have found someone who can make a straight adaptor allowing me to complete the support bearing, I can at last temporarily bolt on the supercharger and spin it up to check the belt stands up to it. :eyebrows:

 

To do this I need to prune 1/2" off the front of the N/A t.b. to get the charger in, yet the spare I had was carved up for components to make the supercharger ICV.

 

I would sooner not shorten the one I have fitted because a lot of effort went into taper reaming and polishing it.

 

Does anyone have an N/A t.b. gathering dust?

Edited by David P (see edit history)
Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. You might also be interested in our Guidelines, Privacy Policy and Terms of Use.