Claaarkio

iTrader: (1)

Well the Z4 ecu is now in my 93wrx but it is still running 0.8 bar?

so what could cause this?

any ideas?

cheers

Dave

dan83590

Boost Solenoid or associated pipework maybe? Try giving it all a clean through. On my 93WRX the bottom pipe from the Boost Solenoid has a restrictor inside, check this is not blocked too.

Are all the pipes OE?

Claaarkio

iTrader: (1)

I have just cleaned it, but i have replaced the vacuum hoses with samco stuff not the oe, i will try this but it was boosting to 0.8 before without a problem? just soedn't want to go higher?

I will try and fit the originals to see if it makes a difference.

I assume the restrictor is the same size for the w4 and the Z4 ecu?

dave

dan83590

All the same matey. Just replace the bottom hose on the BCS and try that.

Or disconnect the bottom hose and take her for a short drive, it should easily overboost..

Andy Stevens

Refit the original pipework for starters.

Its a 0.87 bar map, so not that far off once you take into account the likely accuracy of the boost gauge.

Claaarkio

iTrader: (1)

Yeah so its just under 0.1 bar and on the boost guage (a blitz so should be accurate) its not going past 0.8.

The RR printout shows the boost spike to 0.85 when it first comes in then tails off to 0.8 then from about 6 / 6.5k drops to under 0.8.

Dave

Claaarkio

iTrader: (1)

I might try reseting it as well, but seeing as the ecu has just been put in i wouldn't have thought this would make a difference, would it ?

Dave

myblackwrx

iTrader: (1)

Don't think the reset would be worth it but you could try.
WRX (1995/96) ECU Z4 - 12.71psi, dropping to 11.78psi @ 6600rpm. Fuel-cut 15.65psi
As you can see the boost does drop off at at higher revs

dan83590

Claaarkio, did you try the old hoses?

What happened?

Claaarkio

iTrader: (1)

I haven't had a chance yet, will try it tonight afterwork.

The dropping off seems to be working correctly!! i dont have it with me but the printout showed a definate drop at, I think, 6.5K

BTW It got 250bhp at 0.8bar

Dave

dan83590

250bhp sounds bout right.

Subaru claim 260ps which is slightly different from BHP.

myblackwrx

iTrader: (1)

256bhp = 260ps

1 hp = 09863ps

Claaarkio

iTrader: (1)

256bhp = 260ps @ 0.876 bar

Reckon i'd be getting 256 if i had 0.87, and not 0.8!

How much is a dawes device and where abouts can you get them ?

Dave

Claaarkio

iTrader: (1)

Anyone tried one of these? At the end of the day i guess its just a boost controller, either it consistantly bleeds off the air or is doesn't!!

eBay.co.uk: Manual Boost Controller - Nissan 200sx Skyline Pulsar (item 140109897796 end time 30-Apr-07 12:21:27 BST)

myblackwrx

iTrader: (1)

£25 direct from Dawes in America Dawes Devices
If you do a search for dawes device alot of people have used them.

dan83590

I fitted one. Search for 3BarRacing, the new name for Dawes. I fitted mine to cure a similar problem to yours. I have set it to run with my ESL chip at 1.05-1.1 bar. No probs at all. Fast spool on the turbo. No spike. Very good, just don't go mad with the boost level.

I think mine was £30 inc delivery, arrived within a few days.

Claaarkio

iTrader: (1)

I see thanks!

So does this actually "bleed" off any boost?

dan83590

Its not a bleed valve, hence lack of spike. Works for me, very pleased with it, just set it and left it. Its bypassed the problem, max boost is as it should be, a quick spool, sorted.

Check out the website, it explains how its works.

DiddyWRX

This chip can run the car safely at 1 bar btw and that's advice from a gent who rebuilds these cars every day and that's good for 270-280bhp as well!

dan83590

Claaarkio is using the Z4 which shouldn't be set any higher than 0.9bar..

Claaarkio

iTrader: (1)

I'll be sticking it on the Rolling road when i do this anyway, want to get it set up with no worries of running lean etc.

dan83590

You'll have to resurect this thread when you get the results.

Claaarkio

iTrader: (1)

Will do!

Claaarkio

iTrader: (1)

Dawes device ordered!

lets see what it can do

Dave

dan83590

dan83590

Just kidding...

mickywrx

iTrader: (29)

View my scooby

dan83590

I did follow up by saying 'just kidding'.

So at what pressure are you getting 330bhp?

mickywrx

iTrader: (29)

About 1 bar of boost. I wouldn't advise doing the same as me, don't want blamed for anyones bad luck

dan83590

I'm running at 1.1bar with an ESL chip and am at bout 270-280bhp, so how you get 330 from only 1bar?