JasonO
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Posts posted by JasonO
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You were trying to kill it, right ?....at 12psi it was 12:1 -14:1 a/f ratios but at 14psi it was 30:1 leaning out big time..................we just hooked up the avc-r and took it for a strap and it was running 11 - 12psi exact boost..................... when we had the bleede valve hooked up full boost was at 5000rpm..........the avc-r....full boost at 3000 all way to redline.... -
That's not a very pretty mental image.....your chasing a hairy goatit start running like hairy goat burr bup blup burr....
Which is, or results in detit leans out and gets to hot...
Does it ? Surely you're refering to the RB26 plenum not the GReddy ?unlike a greddy plenum were it has seperate butterflys for each cylinder.... -
Ooooh, Ugly :throwup:
Yep, Nº6 killed by det. Still not convinced of the plenum being to blame though.
I recall of some discussion (about the RB26) along the lines of Nº6 failing becasue it is the warmest, with little (no) cooling airflow actually managing to reach it all the way back in the bay against the firewall.
Did them engines in the pics die on the dyno or on the road ?
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I propose that what happens when running too much boost, is that the charge temp goes through the roof.to much air thats what happens when you run too much boost because the standard fuel pump injectors carnt keep up....Intrested in your photo's though
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The RB25 has a fault with the intake manifold...........
That's not an intake manifold problem Cameron, that's fueling and not relevant to the boost levels we're suggesting here.Consider we have proof x2 i meant that it starved of fuel... to much air thats what happens when you run too much boost because the standard fuel pump injectors carnt keep up....i'll post some pics
The stock 370cc injectors can cope well and easy with .95bar, with the right regulator, pump and mapping.
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Hi Rev, been a while
Guilty,
The stock IC is good for 300bhp and 0.9bar, the stock turbo is only good for about .85bar and running beyond this will be risky.
The intresting thing is that increasing boost beyond .8bar on the stock IC / turbo will not result in an increase in peak power (low down torque will increase though) as the IC is saturated (can't cope with the volume of air) and the turbo is operating out of it's efficiency zone resulting in a rather hot intake charge and subsequently more of that nasty det at high rpm.
This is from experience gained on a dyno, using all sorts of measurements and dataloging everything as we went, Intake Air temp, Turbo outlet temp, IC outlet temp, etc. etc.
Keep the stock cooler unless you intend to fit a bigger turbo
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its got good kilometers on it.
The RB25 has a fault with the intake manifold and if you run too much boost piston number 6 tends to starve and leans out. which casues it to go bang... but this general happens as the car is coming up to the 100k mark & has had a hard previous life.
Cameron,
Surely if it's starved of air, then it'll run rich.
I've never heard of this problem on the RB25DET, certainly on the RB26 the end cylinder (Nº6) gets more air than the others, leading to this being the first cylinder to fail due to det. On the RB25 the plenum feeds over the top of Nº's 3&4 which would suggest that these two would be susceptible to det more so than the others.
Got any more info on this, on the RB25DET ?
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Tom,
Have you got any more details on how to fit the RB26 inlet temp sensor then ?
Is it possible to hook it into the stock loom, and have the PFC detect and use it straight up ?
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But the dyno charts of a Greddy intake sure is a sobering thought.
Tony,
Where can I see these dyno charts ?
What sort of improvement could be expected by replacing the pleanum alone ?
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Better hope he doesn't find y'allI don't think these non-GTROC'ers know of the Mycroft saga
:crazy: :bonk:
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Hmmm,
Looks like this lot went to the Mycroft school of fashion :slap:
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Joel,
From Sumo Power in the UK
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Good news guys, I placed my order for the HKS GT3037 Special Turbine Kit yesterday morning :uh-huh:
Steve,
Looks sweet, thanks for the photos, you know they've saved you from having to answer a gazillion questions from me
B-Man,
Gotta love that shiny look, which exhaust manifold have you used ?
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Beario,
Do you come here often
I've heard that the RB25DET turbo is a good swap on the RB20DET, and there's someone selling one on the www.gtr.co.uk forums just now, check it out
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plenum aint gont nothing to do with it.. but yes.. you can fit any turbo with the stock plenum
I was meaning from a physical POV because the high mount sits in the space that the stock inlet piping uses to return from the IC.
Obviously the IC needs uprating, which in turn brings about a pile of new piping to the inlet......I was just enquiring if there was enough room to clear it.
Thanks INASNT :nowigetit
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Does the GT3037 fit in with the stock plenum ?
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steve,
how low does the CR drop with the 1.6mm h/gasket?
From the HKS GoodsMaster for the RB25DET
- 1.2mm = 9.0
- 1.6mm = 8.6
- 2.0mm = 8.3
- 1.2mm = 9.0
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Not really, seeing as it uses an external wastegate.Is the 3037 a straight bolt in with minimal modifications? -
RS500,
HKS List a a few thicknesses of head gasket in the GoodsMaster, I'll check them out for ya when I get home off this nightshift malarky
Steve,
Would appreciate if you can manage that, I'm especially interested in the turbo / manifold side of the engine.
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better grab a mop and bucket because steve brings out the pictures JasonO
I've got me tissues at the ready
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Steve,
Can you tease me some more with a photo or two of your engine bay ?
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its there to stop all the dolphins from going tits up, and the trees turning brown.
Thanks Steve, It looks like I'll be going for the .87 A/R kit, a nice slow buildup to max boost with something usable below 3.5krpm is exactly what I'm after
Quick recap, your using a 1.6mm headgasket and stock bottom end ?
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PCV is very easy to block,................block it off - it is not your friend:)
Hmmm, had the same problem myself withthe PCV, I cut it open, stretched the sring inside, and glued it back together, problem solved.
Can you tell me why it's not a friendly little thing to have around, as I'd be happy to get shot of it for a tidier appearance.
Can you also tell me a little bit more about the 3037 with the .61 a/r housing, what rpm did it boost at ?
:crazy: :bonk:
Question about the boost for a stock GTS-t
in Forced Induction Performance
Posted
FFS You can't mix RB25 / RB26 plenum design pros and cons willy nilly, they are completely differing concepts of design.