is there a way of checking it ? i'm not getting any CELs

had my car on the rollers earlier and it had lost 75 bhp from 2 weeks ago when it made 347 bhp
made 272 today , the graph shows that my AFR is a flat line from 4100 rpm
boost hit max 19 psi at 4100 rpm but dropped to 13 psi at 6450 rpm

the techy bloke said it's running very VERY rich but i've always had it mapped straight after every mod
bob rawle must be sick of seeing me lol

car is my00 UK classic and has been on many diferent rollers and has always made 340 - 349 BHP
apart from today obviously

i have no idle problem though

lambda or maf ?
could it be 1 of these or something else ?

spec

IHI VF 34 ROLLER BEARING TURBO
K+N 57i
550CC INJECTORS
GT SPEC HEADERS
H+S DOWNPIPE , 3"
BLITZ NUR SPEC R SYSTEM
NGK PFB7R SPARK PLUGS
LIGHTENED PULLEYS
MAGNECOR HT LEADS
WALBORO FUEL PUMP
FRONT MOUNT INTERCOOLER(AUTOBAHN CHEAPIE)
RE-MAPPED FOR OPTIMAX BY BOB RAWLE DEVELOPMENTS
SAMCO HOSES ALL ROUND
BAILEYS VENTURI DUMP VALVE,VTA
3-PORT BOOST SOLENOID

 

replied to email

 

fanx m8

 

Lambda isn't taken into account on a full throttle run, so wouldn't make a jot of difference to the BHP in that respect.

Andy

 

pavlo says i must have a leak somewhere for the boost drop so much
which i can understand, i'll check all the i.c pipe and hoses tomorrow.

but would this still cause it to run so rich ?
70 -75 bhp is a heck of alot to lose

 

It causes the richness, because the air is being sucked through the MAF sensor, so the ECU thinks it's going into the engine, but instead it's leaking out. The ECU meanwhile doesn't know it's lost the air, so puts the fuel in nonetheless, causing richness. In addition, as the ECU reads increased airflow, it sees increased load, and should find itself on an area of the map that has less ignition advance, causing the power to from further. COmbined with less boost, you will easily experience the power difference you see.

Paul

 

Usually makes a horrid wheezy whistle if a hose comes loose (or is left loose as I have done in the past )
No odd sounds apparent?

but does make sence

Andy

 

i've had hoses work loose before and i know the exact noise your on about
but nothing this time
when i ran at interpro i noticed a slight hiss but still ran it
it still made 347 there but the day after the hissing hose did fall off lol
100% secured that 1 and used mikalor for that bit extra
ain't checked t'others yet but will do sometime today
if i can't find anything then i'm going to get a 2nd opinion on other rollers without telling them about yesterdays run, just to see what power it does and if they say it's TOO rich

 

just been out there and can't see anything wrong
jiggled and wiggled but they are all tight including bov hose

needed a 0.75 litre litre of oil and i emptied me catch can which has been full for a while. i'll get on some other rollers this week and see what they reckon.

 

dump valve problem, maybe leaking ?

 

maybe,maybe not

put it all back together earlier , feels fine , hitting just under 1.45 bar and tailing back to around 1.2
the graph on the RR day said i was hitting 19psi and dropping to 13

well 1.45 = 22psi and 1.2 bar = 17.4 psi
so,i've either sorted or god knows lol

 

oil catch tank full leading to degredation of burnable mixture ???

Clutching at straws.

Andy

 

well i emptied it
been full for a while now
was a little lot sh1tty

 

I know hence why you might have fixed it without realising...


Andy

 

I had the seal on the ICV go a little while ago.

That hissed like a basterd!!

Easy to get to and worth checking.. maybe...

 

was just doing everything my mind can handle innit

dunno how you lot work on your feet all day , my bloody back's killing me leaning over that engine for 3 hours
i'll stick to lorry driving

 

You get used to it.

 

nipping down to AP Motors in the morning for a test to see if i've got any air leaks then they're putting it on there rollers for an AFR check then a power run

 

just got back

AFR spot on
340.1 bhp , a bit less than i have made but this was on straight optimax
348 lbs/ft torque , bang on

hit 1.45 bar and settled back to 1.25

 

glad its sorted dazza.

 

cheers bud

that is of course IF there was owt wrong in the first place
still feels the same to me and hitting the same boost as saturday morning

just different on the rollers , but the rollers guy is just the messenger as he told me a 100 times

 

wait & see next weekend to see if still ok.

 

not running bud
my mate in his v4 type r is
he has similar power to me