dyno reading / fuel

[pete.w]

just had me first dyno test and bit disapointed with the results ,it show that its giving 346.8 bhp wich aint bad for a used engine but the pic shows that at 70 mph the power drops off until 74 mph and then pics up again ,its also running dangerously lean and im risking the lump. dont know weather you can see the pic but the drop in power at 220 bhp is vertuatly flatlined. im only disapointed due to the fact ive done so much in the way of mods and wanted around 400 bhp .if shes runnung that lean then with this sorted it should give me a bit more but more inportantly save me lump, but what do you pips suggest i do to put this right ,maybe fuel regulater upgrade ??

its running with a walbro pump ,decats and all the bpu mods (2jz gte)
the chap who runs the dyno sugested a ajustable fuel preasure regulater and block the old one off ????????
advise needed pips

 

[RockPaperSwoRD]

you dont block the old one off, you remove it completely. you can order a kit at driftmotion.com

 

[10secdream]

What do you have for the rest of your setup? What size injectors? What sort of fuel management? Ect.

 

[pete.w]

its a standard mk4 ecu with a uk engine i think there550 injecters ,ive fitted a walbro fuel pump and all is bpu ,plugs decat and so on .been told it could be airflow meter ?

 

[pete.w]

forgot to mention its got a turbo boost controller ?

 

[Supracentral]

Pete, can you get that dyno graph plotted over RPM instead of MPH?

Like this:

or this:

It's nearly impossible to diagnose anything when plotted against MPH.

 

[pete.w]

think he only does this one ,realy need to get too the bottom of this as im risking it.

 

[carguy34]

That plot looks messed up. The drop looks like he shifted gears. It's also way to vertical to be accurate for a stock twin car. I would be nice if you could have the data plotted vs. rpm with an a/f ratio run along the bottom. Frankly, that plot you posted doesn't mean anything.

 

[pete.w]

im starting to think the same,crap dyno. i only took it to the dyno cuz she pinks (chain rattle noise) when i put me foot down so it is running lean .im certain it running lean on full boost so ive got fuel shortage somehow .checked the timeing so fuel pump,regulater,or maybe injecters ?

 

[Supracentral]

Go find a better dyno. If you're willing to drive to ATL, head over to DynoLab and tell Arthur that I sent you:

http://www.dynolab.net

 

[pete.w]

i dont mind traveling but im in the uk, i would have to set off tommorow and get back august lol