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Hez
11-04-2009, 16:05
Had a trip over to bogg brothers this morning to set the carb and boost up.

Dave deals with the rolling road..so we put it on to see what it was up to, the 5 was running very lean and had a boost leak. http://www.performance-on-track.com/forums/images/smilies/frown.gif

We whipped the carb off to check the jet size, which was 1.5mm with a 1.2 air corrector. He drilled the jet to 1.6mm to be safe and put the 0.9 air corrector in to richen the mixuture up!

With the boost leak sorted we strapped it on the rollers and gave it a run,
Its ran 160bhp @ 16psi (ATW)

2nd run was @ 20psi ran upto 180bhp ATW then started to pull off the rollers, dave just laughed and said it had more left!

Over the moon!
Matt Cole
11-04-2009, 16:12
If your saying that you have drilled the main jet to 1.6mm then there is something clearly wrong with it especially if it was running lean. the on boost fueling starts on the 1st then to 2nd stage enrichment jets and not the main.
Andrew Cooke
11-04-2009, 16:27
holy batpoo, a 1.6main with a 0.9 corrector, have you also got a 1.25 in the 1st stage enrichment :laugh: that thing should be black smoking like a tractor puller

http://www.tomahtractorpull.com/images/front02.jpg
Hez
11-04-2009, 16:27
He checked it on idle and said it was running lean, said he didnt have to drill it but said it would harm it :crap:

On boost he said there was plenty of fuel as the pressure increased.?

No black smoke at all :confused:
Brigsy
11-04-2009, 16:41
1.6mm:eek:

I use std 1.2mm main jet ;)

As for idle mixture its controlled by the idle jet/mixture screw. You want it to be 1.5% c.o.
Scoff
11-04-2009, 16:44
Remember guys, if its a 27.5mm choke then 1.5mm is common place. anything less than that can make things quite lean. 1.6mm even for 27.5mm though is a lot, it will be pretty rich off boost I bet. Maybe the 0.9ac on its own would have sufficed, and saved you some fuel ecconomy.
Hez
11-04-2009, 16:56
Yah the mixture screw was rite out when he 1st put it on, the car use to pop flames out before today but its fine now :crap:
Tiny Tim
11-04-2009, 17:03
All important question here...

Did he actually have an AFR gauge connected to the car?
Hez
11-04-2009, 17:25
Yes mate, the lad who owned it before my mate had done all the engine work..so im not sure on the 1st and 2nd stage enrichment jets?
Nayls
11-04-2009, 17:33
:eek:

i bet you had to refill the tank after the 1st run!