Less than expected BHP
 

Recently had a remap on a blobeye Impreza. Has a couple of mods.

Fully de cated (2.5" I believe)
Miltek exhaust
Sti TMIC
NGK PFR6B spark plugs
Lightened pulleys
Walbro 255 fuel pump
Ramair foam air filter

Remap was done on a rolling road and only made 272bhp.

Always run on Tesco 99 Ron.

From the tuning guide I've read I should have expected around 280-290 bhp.

Any ideas why the short fall in power?

Cheers

Need a bit more information than that to potentially identify where the short fall is (if any)

Graphs would help, plus a bit more about the car. (Mileage etc)

There is no short fall on power, thats around the expected power for the mods you have.

Why worry if it feels quick enough leave it alone if not carry on tuning rolling road is good to make sure every thing is working as it should don't get caught up in worrying about numbers no two cars or rolling roads ever give the same figures.

What he has done is read somewhere on the t'interweb that you will get 280-290bhp, the fact is that the turbo will on average only give you 270-280bhp (and the top end if you are lucky), its bang on the power.

8bhp is nothing, you could pump the tyres up harder or loosen the straps and make that back, 272 is about right for your mods, as long as it running nicely now I wouldnt worry

Some rollers are optimistic, so you might find those figures are bang on.

What boost you running? Std TD04?

td04
 

I had td04 mapped by thwaites in warwick we got 287 bhp so your figure is bang on the money. I moved away not long after to vf34 blower plus alcatek ecu plus fpr plus rcm fuel pump plus 3 port boost solenoid mapped by mr b rawle now at 350 /340 , at its limit with gearbox so im done as is my wallet ! :brickwall if it pulls nice in 1 st and 2nd id say be happy. figure chasing and such can be expensive , always remember bigger turbo more delay in spool up. vf series are good units and 34 has roller bearing , so quite strong under pressure.

A flew bhp shouldn't both you, how does the car feel?

Either they had very optimistic rollers or you had a hybrid as 287bhp would be far too much hot air through a td04l and you would suffer boost creep to boot (hybrids are good for around 300bhp).

Post up the graphs so we can have a butchers :thumb:

So many variables to engine condition, RR, temps, tyre pressures, mapper etc. You could easily see a 3% variance in figures just doing dyno runs on different days, let alone different dynos. Need to see graphs really.

Cheers for the info chaps...I was more worried about engine health that was all but if those figures are bang on then I won't worry.

Car does feel really good now and pulls alot better than the PPP map which was only 243 bhp in the end.

I'll dig out the graph and get a pic of it put up to see what people think.

Have thought about better injectors and bigger turbo but I'm thinking gearbox.

Cheers.

Marks dyno at tdr ( dyno dynamics ) is stingy , trust me . :D

If its the tuning guide i think it may be the figures are known to be optimistic for a safe map. Info is as dross as the mapper.

Interesting video on how to fiddle rolling road figures,

Very easy to manipulate a dyno indeed.

1/4 mile is a far more accurate way of measuring performance

o dont start that crap again, there are too many variables on a drag strip for it to be comparable.

Just like a dyno then.

Scale beside it may change but the shape of graph should stay the same,

Which is a good indicator of how a car drives.

And the prize for SN most ridicules statement 2016 goes to........

As said in the other thread, Dyno is a much more consistent benchmark. While yes it does vary some, its alot more accurate than running down a drag strip.

post the dyno printout. Do you have a printout of the boost and lambda too? If so post them too.

https://cimg4.ibsrv.net/gimg/www.sco...895857a3d6.jpg

The graph as promised. Any good?

thats one of the weridest graphs ive ever seen.. or is it just me?

Your torque goes up and down a little, interested to see what your boost is doing / what your boost level is at peak power rpm. Do you have that as a print out?

Torque seems very odd. Max torque should be around 3.5k on a TD04 no?

I don't have that as a print...it's running 1.25 bar boost at peak I believe

You beat me too it.
The BHP figures look OK and relate to my previous experiences with UK Newage 2.0l cars but the torque is quite late on the graph.

David Hendry in Malmesbury may have been closer for you than Indigo. Do they use Open Source mapping?

:wonder: