Rolling Road Results

[John_B 11]

After I had trouble with my original rebuilt Mi, I bought Dave Walker’s old project BX to use the engine while my original engine was being repaired. The plan is to use the TBs, Verniers and ECU on my fixed rebuilt engine when it’s finished.

 

Anyway, after taffycrook had tightened the timing belt for me, why do they always come loose?, we got it on the rollers. We went to Got Boost in Llandow.

 

 

 

Originally I thought the result was OK. 164bhp against the 169 that Dave had seemed OK since the engine has had some abuse since then. But having looked at the graph from PPC I’ve just realised we are losing 11 lbft!!!!!!!

 

 

The fuelling was a bit up and it could do with a service but still ………… The torque curve seems to pick up 1000rpm further up?

Edited May 26, 2009 by John_B

[dcc 855]

I went down to got boost a few weeks ago for its opening, a brand new fiesta tdci something or other made book power and 2ftlbs more torque. my car, being 40degrees out on the lower timing pulley, made 160bhp and 120 ftlbs torque. other cars made good results and were consistant with previous results from rolling roads accross the country.

 

AFR is a bit wavey by the looks of it, but its making good power at the wheels.

[Luca 1]

the torque dial in on the dyno could have been different

[sideways danny 0]

different dyno, different day. No way you can make a fair direct comparison. Your AFR plot looks pretty poor though

[jimbean 0]

different dyno, different day. No way you can make a fair direct comparison. Your AFR plot looks pretty poor though

 

Aint the afr just dropping on gear change....

 

Not going too weak

 

Was the tuner using a 2nd lambda or down the exhaust pokey stick.... latter, could be the cause

[welshpug 1,661]

gear change?!

[sideways danny 0]

Aint the afr just dropping on gear change....

 

Not going too weak

 

Was the tuner using a 2nd lambda or down the exhaust pokey stick.... latter, could be the cause

 

 

you dont change gear on a power run. it should be done in 4th from low RPM to limiter (or thereabouts)

 

The fueling is going rich, so power will be lost. Tailpipe wideband normally only gives odd readings at low RPM, once you get revs up and gas speed is reasonable they read pretty damn well

[jimbean 0]

i apoligise

 

the graphs seemed to follow the drop off and gain as if it were changing gear

 

but hey ho i am no expert i will leave it to you lot

[John_B 11]

Yeah it's a power run so obviously no gear changes. The sesnor was put up the exhaust but I'm not worried by that either.

 

After taffycrook looked at the map for me it turns out that it's a bit of a strange one. The fuelling settings are all over the place. I think Dave Walker may have altered the map quickly to get it through the MOT, or I've somehow ballsed it up by accident.

 

Anyway I'll switch to the standard BX map and see how it goes then.

[taffycrook 2]

How's it improved with the new mapping John.

Should be much better in the mornings, and on the road compared to the old map.

I would imagine some of the missing torques are back too.

[John_B 11]

It's definitely better now.

 

Cold starting is much better although it still idles at 700rpm until warm. Feels maybe a tiny bit quicker but not a lot. Pickup in gear is much better (torques?). Blipping the throttle you can tell the engine is far more responsive. Heel and toeing is far easier. Misfires on light throttle at low revs though.

[John_B 11]

The original map, the one used for the above power run is on the left, the one I've just switched to is on the right. The injection maps are totally different.

 

[John_B 11]

I think this may be why the cold starts are a little better!

 

[taylorspug 7]

Certainly getting alot more fuel at full chat now!