Intercooler Restricting Power Over 250rwkw On R34 Gtt

[mad082]

i had iridiums in my 33 when i got it, they were in there for 20,000kms and were stuffed. put in coppers and they were still fine after 10,000kms. so the reason why iridiums aren't any good is because they are a waste of money.

[PM-R33]

Iridiums are also not ment to be gapped as it damages the end of them. Since most are 1.1 they tend to missfire on high boost applications, hence why most of us run a pre .8 gap on coppers.

[R31Nismoid]

y is every1 so against T bolt clamps, they hold on hydraulic hoses on mining equipment fine with 1000+psi im sure they can hold 20psi

n id also like the hear why iridium plugs are no good, i was thinking of getting a set coz arn't coppers only good for like 10,000 clicks?

If you think the iridi's will last 100,000 like they claim - forget that idea.

In a stock application, ye probably, but in a modified one with extra boost - unlikely.

Why pay $120 for a set of plugs that can foul as easy as coppers anything can foul them really, eg: your fuel reg dies, there goes $120 in plugs.

And say thats only 15,000km's into the set, all of a sudden the coppers are worth their price because you change them frequently.

Plugs are like an oil filter, in a modified application change them often, this is a family magna your talking about.

[joeyjoejoejuniorshabadoo]

whole heartedly agree...

my last set of coppers were pulled out after 20,000 just for good measure and were still running fine at the time. and that's with 300 very abused rwkw...

the set before that lasted just as long

and the set before that were iridi's and were thrown out after 5,000 odd

[allthewaytotheskyline]

odd as my iridiums came standard with .8 gap.

Edited August 5, 2009 by allthewaytotheskyline

[PM-R33]

Then they most likely are platinums, not iridiums. Not many places keep BKR7EIX in a .8 in stock (atleast that's what i find), most keep the BKR7EIX-11.

EDIT: I just checked back a page and you said PFR7B, yep Platinums.

Edited August 5, 2009 by PM-R33

[mad082]

yes they come in both 0.8mm gap as well as 1.1, but if you get the 1.1 (which is the factory specified gap for rb motors) they recommend not changing the gap down to 0.8 with the iridiums as it can damage them.

[allthewaytotheskyline]

yes mine are platinums.

[3LGODZILA]

awsome they were the answers i was looking for, so looks like im gna get a set of coppers. while we're on the topic of plugs, what part number do i need or what heatrange should i get and what should i gap it too. they're going on a usual sub 200rwkw rb25 running 10-12psi, im also gonna be changing to splitfires the same time as the spark plugs go in.

cheers

[adzR34]

No intent on being rude, plug discussions are great

But have we found a solution to the power restriction yet?

Thanks

[Haines]

Yeah ppl

What would be the cause of our low power problems

[PM-R33]

Hmm i didn't even think about your's Pedro. I suppose this is a similar issue you are having, and basically the same car and setup!

[paulr33]

....

power is a simple calculation of

air + fuel + spark + compression = power

whats the tune like?

whats does the AFR look like on max load?

how is the ignition timing tuned?

whats base idle timing ? check it with a timing light?

[joeyjoejoejuniorshabadoo]

he's more asking why there's a 1/2 bar pressure drop between the hot and cold sides paul

cant be tune related...

[paulr33]

compressor out of efficiency?

the more pressure you cram in, the more heated the air is

[allthewaytotheskyline]

got it booked in for monday to be seen by another tuner and have this issue diagnosed.

i dont think the turbo is out of puff as ive seen several other rb25's make atleast 270...and im finding it hard to make just up to 245-250rwkw at anything over 14psi.

plus im getting a massive pressure drop without any detonation...so how can it be producing hot air???

Edited August 6, 2009 by allthewaytotheskyline

[Haines]

found my problem (fingers crossed)

leaking exhaust gas out of a 10mm bolt hole kinda like a little wastegate that constantly open

which would explain why it would hit 18psi then come back down to 15psi

I think its going to go back into the car with a .82 external gate setup now its all out

also i found a crack at the wastegate hole .I dont think that would have been helping my situation either

[SS8_Gohan]

what turbo you running? Mine goes from 18 to 15 as well

[Haines]

gt3076R

Nissan housing on it

bolt is missing from the turbine housing

[PM-R33]

Shit ay! When did you discover that Pedro?