Project Supracharger

[David P]

When I test-fitted the 3.8" and belt, there was no slip but it winkle-d out my bypass-valve foobar, then after correcting the plumbing and getting the extra boost, the map wasn't happy so swapped back to the 4" it's currently mapped for.

 

Keep up Noz.

Edited May 15, 2013 by David P (see edit history)

[David P]

Rich,

 

You made such a good job of that photoshopping, could you do me another please?

 

The plan for the rear is to invert an Impreza roof spoiler, shortened by 1 or 2 vg's and centred (cuts close to the vg's) then mounted by sandwiching the rear under the bumper tight up to the vg's and the front fixed to tank-guard.

 

Not sure which pic will work best, here's the best matching angles I've found.

 

 

Edited May 15, 2013 by David P (see edit history)

[Rich.2211]

Rich,

 

You made such a good job of that photoshopping, could you do me another please?

 

The plan for the rear is to invert an Impreza roof spoiler, shortened by 1 or 2 vg's and centred (cuts close to the vg's) then mounted by sandwiching the rear under the bumper tight up to the vg's and the front fixed to tank-guard.

 

Not sure which pic will work best, here's the best matching angles I've found.

 

[ATTACH=CONFIG]169507[/ATTACH][ATTACH=CONFIG]169508[/ATTACH][ATTACH=CONFIG]169509[/ATTACH][ATTACH=CONFIG]169510[/ATTACH]

 

[ATTACH=CONFIG]169517[/ATTACH][ATTACH=CONFIG]169527[/ATTACH]

 

Hi mate,

 

I'm just off to work but I'll have a go when I get home tonight

[Rich.2211]

I've had a couple of attempts but I just can't get it to look right, sorry

[David P]

Thanks for having a go, maybe I'll just have to try it in old money.

 

I braved some necktrickery today and replaced the cigarette lighter overheat-link purloined from Littler, thank you.

 

 

 

 

The fag lighter now works a treat, but the ignition feed Gremlin persists.

 

I'll work from the other end and get him next time.

[David P]

I've swapped in a U.K. spec fuel tank, the flap-holed Tardis model on the left holds 10 litres more.

 

 

 

 

Does anyone know where this variable resistor is located?

 

 

(Vacuum sensor = MAP sensor)

 

Edited May 20, 2013 by David P (see edit history)

[David P]

I've replaced the 4" tailpipe with a 3" I.D, matching the 3" diameter pipe and bore of back-box.

 

This has raised the exhaust-note, sounding crisper when booted and drone-less on cruise, it's only MIG tacked at the mo, I'll get it to the TIG welder tomorrow.

 

 

 

Edited May 20, 2013 by David P (see edit history)

[chrispot]

Does anyone know where this variable resistor is located?

vaf stands for vane air flow, which is an old type of air flow meter with a flap inside which the incoming air pushes against, sorry I can't be of any more help than that. It may have been on some very early NA's ? in the wiring manual I have got for the supra there is no mention of the VAF, but shows the 2jz ge as having a MAF sensor, so it could be as I said only on certain models/market. MY wiring diagram shows different lighting wiring diagrams for usa and Canada. regards and good luck chris.

[Chris Wilson]

I have never seen a UK, J-Spec or euro spec MKIV, N/A, TT, or VVTi TT with a vane type AFM. Vane types often have either an air bypass screw or a variable resistor to trim them, but I don't think you are going to find one your engine

[David P]

It looks like Mr T. forgot how he'd wired the N/A when he wrote the Supra Bible, it only took 20 years to be discovered.

 

Cheers for the input.

Edited May 22, 2013 by David P (see edit history)

[David P]

With the smaller pulleys to work from/to, I've extended the adjustment available for the idler.

 

Now adjustable from a max of 4.5" down to a min of 3.1", the angle of the slot keeps the idler in max wrap position whichever size pulley is used.

 

 

 

A test fit of the maxed 3.2" pulley achieved belt-wrap of 250 mm, if that doesn't give enough traction, I'll swap up a size.

 

 

Edited May 23, 2013 by David P (see edit history)

[David P]

The new pulleys have each been test-fitted and paired with a belt.

 

Next mapping will benefit from;

 

Exhaust-port matching + exhaust-system upgrade + supercharger bypass-valve upgrade + water/meth injection + cam-timing adjustment.

 

 

Existing

 

4.0" (6PK2550 / 4061003) + 6.78" crank @ 6.8k eng rpm = 11,526 supercharger rpm = 11.5 psi (0.79 bar) @ hubs = 284 lb-ft & 320 bhp

 

Death or Glory R&D

 

3.8" (6PK2535 / 4060998) + 6.78" crank @ 6.8k eng rpm = 12,132 supercharger rpm = 12.? psi (0.8? bar) @ hubs = 3?? lb-ft & 3?? bhp

 

3.6" (6PK2520 / 4060993) + 6.78" crank @ 6.8k eng rpm = 12,806 supercharger rpm = 12.? psi (0.8? bar) @ hubs = 3?? lb-ft & 3?? bhp

 

3.4" (6PK2500 / 4060987) + 6.78" crank @ 6.8k eng rpm = 13,560 supercharger rpm = 13.? psi (0.9? bar) @ hubs = 4?? lb-ft & 4?? bhp

 

3.2" (6PK2490 / 4060980) + 6.78" crank @ 6.8k eng rpm = 14,407 supercharger rpm = 14.? psi (0.9? bar) @ hubs = 4?? lb-ft & 4?? bhp

 

3.0" (6PK2475 / 4060975) + 6.78" crank @ 6.8k eng rpm = 15,368 supercharger rpm = 15.? psi (1.0? bar) @ hubs = 4?? lb-ft & 4?? bhp

 

 

Some completer equations soon.

 

 

Edited May 25, 2013 by David P (see edit history)

[Noz]

When you say exhaust porting, is this on the head side? I thought you'd done both sides.

[David P]

I have done both sides.

 

The inlets last year when I first fitted the supercharger, but the exhaust ports were only done recently and so after the previous mapping.

Edited May 25, 2013 by David P (see edit history)

[David P]

I managed to fit the twin ERL's in the corners of the wheel well and with a little fettling, have included an extending 19mm wheel brace, the hub and nut keys and a high vis jacket into the kit.

 

 

[Noz]

Those pumps look smaller than the one I had with my HFS-5, are they newer? I'm thinking I've some big old thing

[David P]

Those older little fellas are the daddies.

 

They run quieter and go for 'ever', yet 1 is at it's limit driving 4 x 0.4's so running 2 to ensure good atomisation @ peak demand.

Edited June 3, 2013 by David P (see edit history)

[David P]

I've been dodging bad weather and weaving my dodgy spine through the pre mapping job list and these are the last remaining.

 

 

Strip exhaust-manifold, replace studs, fit new gasket and re-jig exhaust front-bracket

 

Fit new spark plugs and realign supercharger

 

Splice the ERL FiA2 into engine loom, twin pumps, Aquamist 2C, w/m gauge and ECU

Edited June 3, 2013 by David P (see edit history)

[David P]

Today was MOT day and the Old Girl passed with flying colours.

 

In perfect parallel sweep, the front brakes sent the needles off the test gauges and past the limit of the machine, so numbers had to be made up to keep the computer happy.

 

I wish I'd taken my camera.

 

Supercharged and with no cats, yet during the 'no cat' test showed such low emissions, that the Testing Technician went and checked that the BLAST he wasn't expecting when he trod on the clitoris pedal, hadn't buried his probe into the wall at the other end of the workshop.

 

 

Edited May 30, 2013 by David P (see edit history)

[J-Meiser]

Today was MOT day and the Old Girl passed with flying colours.

 

The front brakes test sent the needle off the gauge and past the limit of the machine, so numbers had to be made up to keep the computer happy.

 

I wish I'd taken my camera.

 

Supercharged and with no cats, showed such low emissions that the Testing Technician went and checked that the blast he wasn't expecting when he trod on the clitoris pedal hadn't buried his probe in the wall at the other end of the workshop.

 

http://www.mkivsupra.net/vbb/attachment.php?attachmentid=170191&d=1369837794

 

Those are some seriously low emission numbers; nice one !

[David P]

I don't know much about emissions hocus pocus, yet those low figures are indicative of an efficient engine, that is to become more efficient when the water/meth injection is up and running.

 

 

"CO = Carbon Oxide, concentration of the exhaust in percent of the total sample. = Partially Burned Petrol, This is the petrol that has combusted, but not completely. This gas is formed in the cylinders when there is incomplete combustion and an excess of fuel. Therefore excessive CO contents are always a sign of an overly rich mixture preparation. ( The CO should have become CO2 but did not have the time or enough O2 to became real CO2 so it is exhausted as CO instead.) CO is HIGHLY POISONOUS ODORLESS GAS! Always work in well ventilated areas!

 

HC = Hydrocarbons, concentration of the exhaust in parts per million (ppm). = Unburned Petrol, represents the amount of unburned fuel due to incomplete combustion exiting through the exhaust. This is a necessary evil. We don't want it so try to keep it as low as possible. An approximate relationship between the percentage of wasted fuel through incomplete combustion and the ppm of HC is about 1/200 ( 1.0% partially burned fuel produces 200 ppm HC, 10%=2000 ppm HC, 0.1%=20 ppm HC )"

 

 

This was not a 'mates job' and he was making a proper job of it, so I thought it prudent not to ask at the time, but for the record, when I get the chance I'll go back and have it given the full-monty emissions test.

 

Whilst I'm there, I'll make a video of the brakes beating the machine that was designed to beat brakes.

Edited May 30, 2013 by David P (see edit history)

[mellonman]

with these new fuels who needs cats lol,

effiient or lean engine ?

[David P]

Here are the parameters it should fit into and interested to see what the water/meth and HHO will do to the figures.

 

 

The new DBA hats have arrived, I'll fit them whilst it's apart when I raise the front.

 

 

 

Fitted a pair of spoilers to try and keep the wipers on the screen, they look as though they fell off of Dame Edna's Saxo and the "stainless steel" is rusting already, but if they work I'll see if I can live with them painted satin black.

 

 

I was outside having a smoke after midnight and heard a solid knock on wood so went to investigate, there was a gaggle of Eastern Europissheads passing by out the back and assumed they were indulging in the "hurt your own feet by kicking gates and fences" ritual they seem to like doing, so left them to carry on hurting themselves to save me the bother.

 

In the light of day, the knock on wood became clear.

 

Luckily for him/them I hadn't noticed this in the dark, if I had, the one who'd tried to steal it a couple of weeks ago would now have some ethno companionship in the beds around him.

 

 

[David P]

I've booked the Old Girl in for the remap on Friday 28th June with the intention of giving her a run or three at the Jap Show.

 

 

There's not much remaining on the list and with a bit of help with the necktrickery, all is on schedule.

 

 

Strip exhaust-manifold, replace studs, fit new gasket and re-jig exhaust front-bracket. (When the O.E. gasket eventually arrives)

 

Fit new spark plugs and realign supercharger (After the above is done)

 

Splice the ERL FiA2 into engine loom. (Dependant on the healthy neck of A.N. Other)

Edited June 3, 2013 by David P (see edit history)

[Noz]

Looking at the graph of AF ratios, can you explain how water injection makes a difference. I can only see an impact from water?