Pulsing boost on full power

[Steely]

my Liquid Leon Gauge turned up today, and ive been doing some 3rd gear dyno runs,

It seems im gettiing slight fluctuating boost at full chat, its a mapped 1.8 Cupra

Peaking at 17.6psi and dropping back to 15-16 But from looking at the dyno graph its got a smooth power curve on both bhp and torque (210bhp 225lbft) but as soon as it hits peak power its very slightly fluctuating putting the power down,It only does it at foot to the floor, I dont know if you could class it as pulsing, but its very uniform,

Back on with the standard Bosch DV, which will be replaced with a forge one today, Is it possible that the DV is struggling to hold the peak boost and keeps dropping it?

I'll be honest i have put a tank of the cheap stuff in, Wondered if it was the knock sensors stopping pre det,

Cheers for the help

 

[Steely]

seems its back,

Anyone know the clamping load limit of the standard bosch DV? is it capable of holding 19psi,

it keeps backing off on full throttle, (and on full boost, only way to explain it is pulsing)

Response would be appreciated

 

[wayne lcr]

thought you needed a forge 007 with yellow spring when its been mapped?

 

[Steely]

thought you needed a forge 007 with yellow spring when its been mapped?

Its on order mate with yellow spring , bought from one supplier still not arrived, so got one from awesome instead, waiting on that one now,

Anyone know the clamping load limit of the bosch dv??

you at cleethorpes by any chance today?

 

[adam cupra 20vt]

I think your kind of in between a green or yellow spring so may be best with a green spring and a shim? [I take it the shim makes a softer one slightly stronger?]

Standard valve should be ok as the R uses this valve and boosts about that standard?

 

[Steely]

I think your kind of in between a green or yellow spring so may be best with a green spring and a shim? [I take it the shim makes a softer one slightly stronger?]

Standard valve should be ok as the R uses this valve and boosts about that standard?

Ah right cheers for that

All i can possibly think is the bosch DV is comming to the end of its life at 7-8 year old, and the recent remaps possibly pushed it over the edge and its leaking slightly at peak, ,

Its possibly my own fault, i originally had a 007p whilst the car was stock, didnt see much benefit from it so sold it to generate a bit of spar cash,

Its something ive overlooked since the remap, Oh well live and learn

 

[wayne lcr]

Ah right cheers for that

All i can possibly think is the bosch DV is comming to the end of its life at 7-8 year old, and the recent remaps possibly pushed it over the edge and its leaking slightly at peak, ,

Its possibly my own fault, i originally had a 007p whilst the car was stock, didnt see much benefit from it so sold it to generate a bit of spar cash,

Its something ive overlooked since the remap, Oh well live and learn

na want at cleggy mate if you want my 007 brand new and still got the oem 1 as well and me 007 got both yellow and green springs so if you want to try it giz a pm and ill nip down or meet you some were if you want mate

 

[Steely]

appreciated mate, if id have known i'd of waited on buying the awesome gti one,

cheers anyway,

yeah saw a lcr with black 18" at clee over the weekend, seen you a few times down bawtry road past the racecourse on sat/sun mornings

 

[wayne lcr]

lol dont like clegg skeg vegas yea and prob to go shell and fill with v power

 

[Steely]

just took it for a quick spin and decided to do a Liquid gauge 3rd gear dyno to 6.5k to have a quick look,

Its one hell of a lot smoother from what it was since sticking 98 ron Petrol in it, still not got the 007p on yet, should be on by the weekend

****Ignore the data up to about 2.5k revs***, i did the plot whilst rolling just so i could have a look at the peak boost and bhp, (The torque may look on the low side its not an agressive map)

anyone got any feedback, how does it look from your persective? its the fluctuating after peak thats got me could it be the n75 knocking back?, or does that look quite normal?

 

[Steely]

anyone?

 

[Steely]

Boosting problems, bit of feedback please!

Can i get a little bit of feedback please!

the n249, when it drops boost to stop overboosing, is it on off on off on off, in say second intervals? or would it smoothly cut the boost?

im trying to find out if i have an overboost problem, it only does this at full throttle,


command requested boost is 16.8-17.1

and im getting a peak of actual boost, 18.6 that then settles to about 16.4,

 

[Steely]

sorted now ,

 

[wayne lcr]

was it the dv? and was that you i passed near the racecourse today?

 

[Steely]

was it the dv? and was that you i passed near the racecourse today?

yeah tuned out to be a leaking Oem one , forge 007 back on now,

Yeah was me, saw you at last second, put a spotted thread up, just on my way back from sorting office to pick up 007p actually!

 

[wayne lcr]

lol no worries we will have to get a meet together some time