23 replies to this topic

[Soop]

I'd be with you on this Jovi. Could you please verify how the Twin turbo system works for me? Because if possible, it would be interesting to see what sort of temperatures the intake charge is getting to while running this kind of boost. Noting that the maximum recommended boost pressure for a TD04L is 16psi. The TD04L is substantially larger than the Primary on the GTB and the B4.

[Billsy]

i wouldnt go doing that, and i would give almost anything a go. its all well and good disabling the wastegate so it will run max pressure on the primary (the bleed pressure of the ECV), but when you hit the secondary, that 16 psi can easily turn into 26 psi or more...

[XXB4XX]

I been running mine at 18+ psi for a little while now?..... (now saying it, it's prob gonna do the same as my gearbox and go splat)

[Jeff]

would running 16psi on primary really cause too much drama??? the secondary isn't any bigger really and ppl are running 18, 19, and even 20psi on that without issues

[Soop]

Billsy, how did you go about getting you car to reliably run the boost it is?

[XXB4XX]

p.s, I left the bloke a nice reply on the first link.. lol stupid greek.

[Mav]

isnt your primary f**ked in the first place jov? or did you fix that engine light issue thing?

[twinturbosubaru]

Not so fast kiddies, I ran 16psi on my primary for years, it's not how much boost you run and how sensible you are. Remember also that once the secondary kicks in the primary drops right down on pressure, sometimes down to around 5 psi whilst all the beef is heading to the secondary. I monitored individual pressures on both turbos for some time and was pretty surprised by what I saw. My 0.02c worth Regards Paul

[Soop]

The problem with that mod is that he Primary boost is unregulated Paul.

[Billsy]

its not the primary where the issue is, the primary will only make around 16 psi due to the spring tension on the ECV which acts like a wastegate, but when your on the secondary the ONLY pressure relief is the wastegate, if this is bypassed you will create much more boost than is safe. much more boost on a B4 = detonation, which = no more engine in the long run. just get a boost controller and have the benefit of higher boost and ability to stop the engine from boostin its tits off. i left the goober a message aswell sooop, my turbos are ported, slightly hi flowed and i now have a P18 housing on the primary (modified vf19 secondary housing on vf 26 core and front), so 20+ psi isnt out of my range, although its not exactly in its reasonable efficiency rannge

[Billsy]

a bit off topic, hahahahah http://au.youtube.co...feature=related

[Soop]

What are the efficiency ranges of the factory Twin turbo's?

[Billsy]

What are the efficiency ranges of the factory Twin turbo's?

which ones do you mean?

the actual ranges are a bit of a mystery, but the stock 18/19 and 26/27 ive used dont seem to do much more above 18/19 psi (although theres a difference between them)
once you port the turbos and ecv that changes to around 19/20 psi (but makes a bit more) and once the exhaust housing is changed it opens up a new page on TT's which im still writing, although so far the vod is back but power is on strong.

[Soop]

Have you run it on the Dyno yet?
If not do you have plans to do so anytime soon?

I was guessing, that seems the turbo's are all roughly similar sizes, that they may have similar efficiency ranges.

[Billsy]

Have you run it on the Dyno yet?
If not do you have plans to do so anytime soon?

I was guessing, that seems the turbo's are all roughly similar sizes, that they may have similar efficiency ranges.

alot has to do toth the exhaust trim and A/R which is mainly ahayt ive been muching with, i havent changed any comp wheels yet as i dont have the equiptment to balance them.

once i get the boost issue sorted ill go to the dyno for a comparison, i think it will be quite positive. from the results so far where ive now managed to hit 20 psi for short periods. and pump mad flames out the back

[Soop]

Hahaha, Need video evidence!

I'll certainly be keen to follow the progress.
http://www.subyclub....hp?showforum=45

I want pict0rbz of this Frankenstein.

[B4TT]

The 33 and 32 on the ADM B4's would have a slightly higher efficiency then the 18/19 combo but wouldn't it?