Tuning turbo time!

[craigb244]

built and fitted 4 velocity stacks... made them from a bit of old exhaust pipe and a 15ton press. they where formed from an inner taper bearing race and a inner race from some other bearing. (got a huge collection of ramdom crap for stuff like this lol)

trued them all up and made the length and flare the same on all of them.

welding never went well... cleaned it loads and weld would not take... turn up the amps and it would take but the heat caused the weld to droop. should clean up ok.

All to do now is smooth the oval shaped ports into the round stacks

ordered a large pwm valve for the antilag.... mewahaha

 

[lxfusion]

Some nice pictures of ALS-systems from back in the days, enjoy! :

Original Audi Sport anti lag system used on the 20v:

Used in the 1985 Pikes peak hillclimb car:

Toyota GT-4 WRC car from the early 90's:

All this is sourced from a lovely thread found here:
rs25.com

 

[Munkul]

I wonder how much damage it causes... I mean internetz pplz keep say having no dump valve kills turbos but I know thats not true.

it DOES kill turbos... well not pissy little ICV bypass setups like a lot of people run, it cant flow enough air, but full-on WRC antilag like that audi setup (seen that pic before, its cool as: worship it goes through turbos quite quickly. Then again, it depends how often you use it... I suppose you, like me, have been pissing around with full-throttle shifts for long enough to realise real anti-lag will just be more of the same theres definitely more wear in my turbo bearings than there was before, but it was nigh on new, so you'd expect some wear naturally.

 

[craigb244]

I never noticed any real wear on mine... and use it quite a lot....

killed my clutch tho... which is why im interested in the new antilag. it sounds like it would work at lower rpms/smoother and be less stressful on the clutch/box

 

[Munkul]

you could actually come off the throttle giving the plates time to engage before you unleash instant full boost again lol

 

[craigb244]

been lurking on munkuls thread (brilliant work btw) seems we are coping bits from each other... this may never end haha.

noticed you where looking into the antilag valve so took some photos of mine while i was fitting the connections (even found some silicone hose that connected it all up perfectly )

as for the valve itself... the hose connections are 19mm but inside there is a square hole about 10mm by 18mm and works by a drum with a window in it. the drum rotates to open up the square hole... pretty cool I thought.

anyway I think it will flow more then enough for the anti-lag. the standard stepper motor on 8valve only has a 6-7mm round opening and even this flowed enough for me to almost bounce the engine off a 7500 rpm limiter (back in the day when i fitted ms and tried to get the idle stepper working)


oh and thanks for the cam tip... checked my cams and found a set with higher lift...:yum:

 

[Munkul]

useful, ta

haha I learn off you, you learn off me, win-win

It looks like the normal GM 2-wire plug - which means it'll plug straight into where my GM boost solenoid plugged, no wiring alterations :worship:

Nice work as usual dude, what TB are you using? I think I missed it...

 

[craigb244]

Yeah think the plug is the same as the injectors

The throttle body is from a rover 400 and most others I guess. It might be a bit on the large size. Got it for £10 brand new

 

[fingers99]

Good price, probably the 48 Dell'Orto TB. J333EVO used one on the n/a 1.4 16v Sei without issues, so it should be fine.

 

[randomizered]

aye, 48mm, also used on mine as well for a while no probs

 

[craigb244]

yeh that be the one. It huge compared to the standard 16v and even the larger on from the bravo that people fit.

only bought it after looking at random throttle bodies (cheapest first) and seen that which looked good because it never had no idle valve and looked small/basic with a very nice bolt pattern.

reason I was looking is the standard throttle body has a large opening that would require a silicone reducer which would cost more then buying an more appropriate throttle body

 

[fingers99]

There is a much bigger version -- I think 65mm or so -- used on some of the Lotus K Series engines (should that one prove too small

 

[craigb244]

yeh that seems to be what most of the rover guys go for. I asked the seller before hand to make sure it was not that. be defiantly to big.

still think this 48 is a bit on the large size. might be good for a ported and cammed N/A engine. we will see

 

[Munkul]

its only 0.5mm dia bigger than a marea TB. It'll be fine dude.

 

[craigb244]

made the turbo brace... took a while to figure out (had to drill and tap a lump that was on the block)

very rigid so should work... i guess.

 

[woj]

Any good reason for this contraption on the oil feed line? Do I guess right pressure sender to monitor turbo separately?

 

[craigb244]

its an inline turbo oil filter

 

[woj]

Had no idea there are things like this. But then, I have no idea about many things

Obvious issue that hits me right away: filter = cleaning up stuff = collecting crap = getting stuck eventually = dead turbo. Or am I missing something?

 

[Munkul]

You're missing the fact that something would have to be seriously wrong with the engine, to produce enough crap to block the filter, even after several years

The turbo oil feed comes straight after the main oil filter anyways.

Bracing looks good I didnt spot the horizontal one until I looked a second time!

 

[craigb244]

the filter is just a wire mesh in a cup shape so would take a lot of crap to fill.

Its just a precaution really. the turbo gets filtered oil anyway. I just figured that it would protect the turbo if there happened to be any crap on the clean side of a new filter