I seem to remember Pete Croney saying that there were issues with a lot of retard on the MY01 PPP.

I logged Mike's UK300 PPP with original up-pipe, but Magnex twin dump downpipe the other day and it was running about +8 degrees knock correction (=advance) across the range on full load.

Anyone else logged a Bugeyes PPP with only a downpipe?

 

Anyone?

 

John

From memory Pete was seeing about 9-11 degrees less advance with the standard uppipe and a Scoobysport full decat on a PPP'd car on a rolling road. As an RR is about the most severe test (lots of sustained power and minimal cooling air in comparison to road conditions) I guess that this would be why he found a worse case than you.

Pete's original results persauded me to change the uppipe (not to a Scoobysport, but a different manufacturer). However, I've had a number of problems with the change - the first didn't fit and the current one looks like it is beginning to develop a leak. Maybe it is better to fit one with one with a flexi-joint.

Duncan

[Edited by BugEyed - 5/18/2002 8:43:34 PM]

 

This one had a dirty great load of advance of at least +8 degrees across the range and was in rude health. I was very surprised - I was just advising the gentleman to get an up-pipe PDQ and then to see that timing was quite surprising. As it happens Falkland had a new Magnex design to try out anyway, but it is not flexible.

 

so is it ok to fit a down pipe?
it it ok to fit up pipe?
ether together or separate?
and which is the best make ?

steve
my01 wrx ppp

 

Everyone seems to agree it is safe to fit both. On one car that I tried just a downpipe seemed OK - does not mean all will be. Up-pipe only - Caronte posted this question don't know if he had an answer.

 

John,

I logged my friend's WRX MY01 PPP last week which has (I think) SS UP, SS DP, SS centre but with the OE rear centre silencer thing + PPP BB.

He is running about +8 deg Knock correction too....

I can a)double check the exhaust details if you like and b)mail you the trace

Matt

[Edited by mutant_matt - 5/19/2002 11:23:25 AM]

 

That would help nicely Matt or screen dump the trace as a .gif and post on here.

[Edited by john banks - 5/19/2002 11:31:52 AM]

 

John,

I'll mail you the trace, and I'll try and double check the exhaust details tomorrow....

Ta,

Matt

 

John,

YHM m8

 

Thanks, yes looks the same. Like the "13.5 PSI" yeah right Funnily enough mine reported the same with my fuel cut defender on, wonder why

 

John,

According to his Defi's, he's peaking about 1.4 and holding 1.2-1.3 - 13.5psi is of course, the PPP doing it's thing (how annoying is it that you can't monitor the "real" boost figure on an MY01 PPP )

Matt