My Rolling Road Visit
Turbo Mini Forums

Thought I'd share my power graph from todays rolling road visit. Blue is 7psi, Brown @ 12psi and Yellow is 14psi showing 149.5bhp @ the wheels and 170bhp @ flywheel. We only went upto 6k, as engine as only covered 400 miles and power seemed to level by then anyway. The curves look similar to n/a power runs due to the slow spooling oversize choice of turbo, that builds boost far to slowly for my liking.

Class C 3rd Place Avon 2011 14.18 @101mph

nice results

Done now needs redoing lol

What was peter like? I've heard a pretty bad reveiw about him lately.

They are good results for the boost run though

Audi s4 b5 - 470bhp & 486ft lbs

On 30th Apr, 2012 Brett said:
yeah stick the bit in and give it a wobble

Benny pm'D

Class C 3rd Place Avon 2011 14.18 @101mph

Very nice results, must be that cylinder head. lol

rick

WWW.FORCE-RACING.CO.UK PLEASE CLICK HERE

Thanks guys

Edited by alaskanow0 on 14th Sep, 2011.

Class C 3rd Place Avon 2011 14.18 @101mph

its a cracking car mate, id be happy with that power ( to begin with )

Yes i moved to the darkside

Instagram @jdm_brett

That develops peak torque quite low down really. My N/A motor needs a good 1000rpm more to peak.

Brett, I was going to try a run at 16psi, but bottled it has AFR was creeping up with more boost (12.4 at 14psi) and I ran out of time to carry out more needle work. I plan to run 16/18 at the TM rolling road day, but don't think I dare risk anymore.

Class C 3rd Place Avon 2011 14.18 @101mph

pok pok pok pok.

^ my best chicken noise.

BTW nice numbers especially for the boost level.

If something is worth doing, it's worth doing half of.

What needle did you start with?

Found bca to rich at cruise and full load, so started with BDD. Almost there just need to work stations 11,12

Class C 3rd Place Avon 2011 14.18 @101mph

We started with a BCA and just added more boost until it was OK. 25psi and counting...

bca is too rich on cruise for us too. but we're not bothered! lol

If something is worth doing, it's worth doing half of.

So what engine is this?

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

I was getting no richer than 13:1 on cruise with a standard bdd.

Audi s4 b5 - 470bhp & 486ft lbs

On 30th Apr, 2012 Brett said:
yeah stick the bit in and give it a wobble

Spec is

1293cc 5 Port 8.6-1CR
Mirage Manifolds
Hybrid T25, with T28 55Trim Compressor Wheel, R5 Compressor Housing, 300ZX Shaft and Turbine Wheel (Its way to big), Im moving to Either Gt1548, or GT1752 after TM Shootout.
Omega Pistons Cast +20 10cc
Fully worked Crank & Rods
BMW Oil cooling Jets
Oil feed thrust's
ARP Rod & Head Bolts
MED FIS Head 36 x 32mm Valves
Drydecked
1.3 Med Rockers
Phase 2 Cam
Alloy Venier Adjustable
MED Pre-Verto Billet Flywheel & alloy backplate.
Single Grey Diapham & Bonded AP Plate, MED Arm Kit
SCCR Box & Quaife Diff etc. 3.1FD
SC Drops
MJ and MED Trigger
Custom Intercooler
Nic Plenum
AEM Thru Boost Adjustable Boost Controller

Edited by alaskanow0 on 15th Sep, 2011.

Class C 3rd Place Avon 2011 14.18 @101mph

Well, that power curve gives an SOT of 11.23 at 6k, so it is up there with the best.

Don't bother changing the turbo.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Sorry to be stupid but what is SOT? Im not 100% on accuracy of results, in my experience these rollers normally show 10% to high, based on my dyno'd 1380na & prevous engines run on other rollers. I did however change the dyno setting to show 10% less for these runs with an increased load.

Class C 3rd Place Avon 2011 14.18 @101mph

It's Robert's equation that gives a specific output fron an engine:

STATE OF TUNE = power/(litres*boost bar abs *(rpm/1000))

It provides a much better comparison between engines than headline figures as it levels the playing field.

The result shows how well an engine is breathing, so relates to VE more than anything.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Paul, the turbo does peforms quite well , just spools and builds it boost very progresive and slowly due to over sized compressor wheel, I would prefer my boost lower down, which would make a far better road car. Maybe its just me comparing it to my race 1380. I plan to do back to back test with a standard T2 before moving to the GT Series. Im pleased with the SOT , I guess we will confirm the results at the TM shootout. Either way 14-16psi feels way to much on the road especially with a torque steer issues.

Edited by alaskanow0 on 15th Sep, 2011.

Class C 3rd Place Avon 2011 14.18 @101mph

i know your turbo isnot the usual suspect but is there not a compressor housing available with a smaller a/r to just swap out?

Edited by Brett on 15th Sep, 2011.

Yes i moved to the darkside

Instagram @jdm_brett

Brett, no others seem to be available. The housing as been machined to accept t28 55 trim wheel. The housing is .48, which should be ok with the smaller t25 50 trim. But would mean new housing, wheel and machining. I think oem spec is a better starting point to build from, hence standard t2, gr17 etc.

My lean off pipe is still connected.

Edited by alaskanow0 on 15th Sep, 2011.

Class C 3rd Place Avon 2011 14.18 @101mph

Maybe rev it a bit harder then if its late to build boost, the spec of the engine looks up to it.

I'm currently researching whether a TD04 and phase 2 cam will give me use up to 7500rpm.