How to make the Pulsar run better...

[Alex]

I got the Pulsar back on the road after the new sills were done... thanks to you guys for your advice and help

It is great fun to drive, once you get used to the turbo lag...

It idles at 1500 - 1750 revs - must be too high, surely?!?

Any ideas on what could be causing this and how to fix it?

 

[Fast Guy]

Air leak somewhere after the inlet, assuming it's set up properly and the throttles aren't just open too much.
Try the idle adjusting screw first, if that makes no difference then it could be a case of checking all the hoses on the back of the engine for air leaks.

 

[fubar andy]

As above...

 

[Alex]

OK, thanks for the replies.
I have looked up the relevant pages in the workshop manual and will check it out this weekend...

 

[Fast Guy]

One other possibility is the dump valve could be leaking.

 

[Alex]

OK we checked the hoses to the right of the engine that run to the back of the engine. When you move them around it affects the idle speed and makes the engine run really unevenly, and even stall. The hoses attached to this blue thing - see picture - seem to affect the running of the engine, but we couldn't find a leak in the hoses. What is the blue thing? Is it standard fit or a modification?
Does it need cleaning or replacing?
Is there a GTI-R specialist in the London area I can take my Pulsar to to get it sorted?

 

[Fast Guy]

Blue thing looks like an after market dump valve.
If moving things makes it run unevenly and stall, I'd suspect you've located the problem.

 

[PobodY]

I'd guess it's a piston valve, and it gets sucked open under vacuum at idle... which lets unmetered air in and increases the idle speed.

It's not an uncommon problem, and manufacturers like Bailey will tell you that a single piston dump valve is meant for a carburetted turbo application. - They make a double piston valve for EFI applications.

 

[Richard_Sideways]

Is there a GTI-R specialist in the London area I can take my Pulsar to to get it sorted?

Depends on what you call London area. There's Ed at Fusion Motorsport in Chertsey who knows Rs inside out, but hes often busy as hell. I've been taking mine to a place called EuroSpec in Guildford. They're a general Japanese performance place but they know the R ok from my experiences with them.

 

[Alex]

I'd guess it's a piston valve, and it gets sucked open under vacuum at idle... which lets unmetered air in and increases the idle speed.

It's not an uncommon problem, and manufacturers like Bailey will tell you that a single piston dump valve is meant for a carburetted turbo application. - They make a double piston valve for EFI applications.

OK from what you wrote, I guess this piston valve might be the problem 'cos it might not be suitable for the GTI-R... Should I just remove it and see what happens?

 

[lakeview]

that looks like a turbosmart dumpvalve it will be compatible with the gtir,though that doesnt mean it works they do wear over time