I'm having dirty thoughts...

Way to late for me to add this by the looks things, but i would like to say that i chuffing love Dump Valves.

The sound of rev limiter backfiring launches followed by dump valve 'ptoosh' and wastegate chatter gives me the horn. I know when i've a car worthy i will be investing in one.
 
Clarkey said:
You wouldn't have bought that S3 is fuel cost was an issue though right, otherwise whats the point in it, your argument seems pretty poor.
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Your arguement doesn't even exist given you've no real experience actually running a car, let alone a half decent one (Becuase 300ZX's are cheap to run when they live in your garage) - although it may not be a driving force between many peoples decisions to buy you cannot ignore fuel economy and most people will keep an eye on it when driving. Aside from depreciation, it's the biggest cost associated with car ownership.
 
Clarkey said:
You wouldn't have bought that S3 is fuel cost was an issue though right, otherwise whats the point in it, your argument seems pretty poor.
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The S3 is better on fuel than the R32, 3.2v6 A3 and 130i. How do you know that wasn't a consideration for me?

Fuel economy isn't a primary concern when buying any sort of performance car, but to say it doesn't matter at all is simply wrong.
 
Had a Blitz on the Rex, it sounded nice, if a little quiet.

On the Scoob I had a Forge, very loud, and almost sounded like a whip cracking really really loudly.
 
eidolon said:
What about SARD R2D2? I heard they're pretty good value for money (no personal experience however, only going on reviews)
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Yeah I've heard about the SARD DVs... don't think I've ever heard one though. Just looking on the bay and they're around £100!! Can't afford to spend that much on one! :(

squiffy said:
I believe uneconomical on fuel, and can damage your engine?
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I thought it was just the fuelling that they mess up on some engines (VAG 1.8 Turbo). Don't think they actually damage the engine.

Clarkey said:
who drives a turbocharged car and gives a damn about fuel consumption lol.
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I fill it up when it needs to be filled up, don't really care how much it costs me as it's fun to drive... but recently I have started to back off the loud pedal as petrol prices are pretty ridiculous at the moment.

Bug One said:
I made a video showing what it sounds like a few months back. Just uploaded it to youtube, so still be processing. Will post it when its ready.
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Already seen that video Dave, got it on my computer actually.

Edd, I'd stay atmos-free on my car but the chatter from the T25 sounds a bit gay. I'd much prefer the chirping of baby birds, but instead I hear a group of pigeons everytime I let off the throttle.

haha Phate. I have no problem turning heads (had some absolutely comical responses which make me burst out in laughter as I drive by), I'm just after a different sound.

I'm currently keeping my eye on a few kits on the bay... although it's quite ridiculous. Dump valve fitting kits, comprising of a T-piece, hose clips and a bit of silicone tubing are selling anywhere from £5 to £50.. and they don't even include the dump valve.

Even the T-pieces on their own are £15!!!! (edit... £5.50 for a fitting kit... not bad ;))

Wouldn't mind one of those HKS replicas though. If they sound like the real thing, I'll be very happy.
 
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playworker said:
Compressor stall is for winn0rs.

Fit a T28 - much better sounding (read: louder) compressor stall :)
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New turbo is on the cards next year :)

Going to get something with a 360º roller bearing, no chance of the turbo being damaged by running without a dump valve.

I've seen a video of a Rover 620Ti with a GT28R (no dump valve) and it was exactly the type of sound that I'm looking for.
 
agw_01 said:
Going to get something with a 360º roller bearing, no chance of the turbo being damaged by running without a dump valve.
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360 degree bearing is just a different style of journal bearing - standard is 270 degree. Roller bearing is something altogether different AFAIK.

Stock T28s seem to be happy at 1 bar with no dump valve - keep an eye open on SXOC and you can pick up one off an S14 for ~£150. GT28Rs are normally a bit pricey :)
 
Ahhh gotya :) Showing my noobishness with turbos there. So I'm guessing it's the 360º bearing turbos aren't affected by running with no dump valve?

What does the roller bearing part do?

Like I said earlier in the thread, compressor stall doesn't seem to be an issue until you get upto high boost levels. There's a guy on Rovertech who's running a 200sx S14a turbo in his car at 12psi and he's been running without a dumpvalve for months without issue.

Another question for you... what's the difference between the T28 and GT28?
 
agw_01 said:
haha Phate. I have no problem turning heads (had some absolutely comical responses which make me burst out in laughter as I drive by), I'm just after a different sound.
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Ahh stop complaining about the price and treat yourself! :D you've said to me loads of times you like them so you won't be happy until you do :p

Paid £85 for mine (Forge) - I still remember the convo with Sirrel Squirrel over msn now

16:00

Jacob Says:
Convince me to put a atmos dump valve on my car

Luke Says:
DOOOOOO IT!!!!!


....


16:01

Jacob Says:
It's arriving tomorrow

Luke Says:
Sick :cool:
 
agw_01 said:
Like I said earlier in the thread, compressor stall doesn't seem to be an issue until you get upto high boost levels. There's a guy on Rovertech who's running a 200sx S14a turbo in his car at 12psi and he's been running without a dumpvalve for months without issue.

Another question for you... what's the difference between the T28 and GT28?
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I run my T28 at 17psi and have done for nearly a year and before that it was running 15psi for a couple of years without a recirc valve because it packed in for some reason after fitting my FMIC. Doesnt seem to have made any difference to the turbo as it still runs fine.

I'll soon know if there has been any damage to the turbo as its coming off to fit a GT2871R sometime this month, just waiting on my 300Zx TT AFM to turn up from Japan.

The T28 is a standard journal bearing turbo the GT28R is a ball bearing unit.
 
agw_01 said:
Ahhh gotya :) Showing my noobishness with turbos there. So I'm guessing it's the 360º bearing turbos aren't affected by running with no dump valve?
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Compressor stall is a high vibration effect that can break things, stall also puts more thrust load into the shaft theres no golden rule with it all anyway, the oil seals tend to fail on a turbo way before fatigue sets in.

A normal journal bearing is just a surface where the shaft sits inside with a layer of oil fed from the engine to lubricate the moving, a roller bearing is where the shaft is connected to the inner race of a roller/ball bearing and the outer race is the turbo housing, the contact area here is less so you have less resistance and the load is primarly support by the ball bearings rather than a oil film.

270 degree has 1/4 of the bearing surface missing so its easier to fit parts, 360 is a full surface, more awkward to build so you have shafts with bolt on compressor wheels. They do support lateral loads from the compressor screwing the air and the stiffer section has less issues with an inbalance of the shaft/wheel assembly.
 
Ive had various, and found the SSQV too high pitch, kinda gay :)


The Sard R2D2 would be my choice. Cheap to buy, deep meaty noise and well made.
 
Hate to say it, but if I had a turbo'd car that didn't grumble if you put an atmos DV on it I'd have one in a flash :p

I'm sure the novelty would wear off after a while but I kind of like them :) :)
 
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