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R34 Loud Bang, Boost More Than Halved

surfm8

By surfm8,
in Engines & Forced Induction

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surfm8 Rookie

surfm8

Posted
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I drive a R34 GT-T and have done abit of modification. Upraged fuel pump, bosch 1000cc injectors, link G4 plug and play ecu, greddy intercooler, kiwagana 76mm turbo, spitfire coils and a GFB boost controller, it was tuned at 18psi or so giving it 266rwkw. Tonight i was giving it a few test runs and there was a loud bang and then the boost has gone right back to about 7-8psi. I looked under the hood and noticed a small tubes clamp has blown off and the tube had came off aswell. i have circled where the tube was in the photo below (it was lowest tube on the top section) and air appears to be pissing out from where the tube was attatched. with it being dark i havent been able to look fully into it all. the car still runs and the only problem (so far) is the boost problem. Any ideas on what blew off the car and any ideas on how to fix my problem?

post-117564-0-73955200-1387799480_thumb.jpg

wolverine Grand Master

wolverine

Posted
Posted

I don't think that small vacuum hose is going to account for a loud bang.

The hose (we are guessing) you circled obviously needs to be reconnected but I suspect if you have a good look around you will find an intercooler hose has come off.

ido09s Mentor

ido09s

Posted
Posted

Its a bit inconsistant given you heard a loud bang and as said above, you would normally expect a loud bang to be much more than simply a vacuum hose. Unless its the fuel reg hose and it caused the tune to go haywire and it was in a backfire out the exhaust

Obviously reconnect that hose, but i would agree you have probably also popped an intercooler hose. Get underneath and give them a real good look over as they can often look like they are still connected properly after they have popped off.

surfm8 Rookie

surfm8

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Thanks for all your suggestions guys. After getting up this morning I have gone back under the hood and haven't seen anything unusual. Checked connections seeing if anything is loose or leaking but to no avail as of yet. If I can fix this problem is it going to need a retune after the severe boost drop?

surfm8 Rookie

surfm8

Posted
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As normal the masses are right and the main problem was the first pipe from the turbo out to the intercooler had let go. Cheers for all of the input guys, it was very much appreciated! :-)

Rolls Grand Master

Rolls

Posted
Posted (edited)

Its a bit inconsistant given you heard a loud bang and as said above, you would normally expect a loud bang to be much more than simply a vacuum hose. Unless its the fuel reg hose and it caused the tune to go haywire and it was in a backfire out the exhaust

My vote is this, fuel reg blown off would make it do something funny, probably also the clamp smashing into the bonnet along with it, might even be an intercooler hose missing.

I've blown my intercooler piping off a few times with the old clamps I had, made a huge bang as the pipe would smack the bonnet and then I'd get a huge cloud of black smoke/backfires, sounded pretty bad when it happened, thought I had put a rod through the block the first time.

try using T bolt clamps instead of worm drive ones.. those babies will make sure nothing comes loose...

t-bolt_clamp.jpg

as soon as I replaced mine with these I never had a problem again running at 18psi

Edited by Rolls
Ben C34 Grand Master

Ben C34

Posted
Posted

I have had a problem using them with a dodgy bit of pipework. I was in a rush and didnt weld a lip onto a piece of pipe and it blew off at 20psi . Those clamps are heaps better, but not going to fix other issues.

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