Dyno Test - low on power, what next..?

[P_G]

Not necessarily, as you know in third which this dyno run was done on there is the combination of air box flap and torque limiter removed. It could be that on the road the surge is felt but is this the same surge as in other cars, some people have expressed partial opening of the flap. Plus if there is insufficient airflow in the first place it will affect the top end much in the same way as occlusion as you would have it by carbon build up.

Plus IIRC the figure was 338.6 at the crank which is only 10bhp (3%) less than my lowest Dyno Dynamics figure and 30bhp (8%) less then my best. Yet like I said before my car can make 400+ bhp on a Dastek road with the same car and can run 8.2-8.5 second 3k-8krpm tests. So between Shoot mode, fuel and airflow certainly creditable.

[sonny]

Daz rs4,does it always kick in the higher gears? Or have you had it feel flat like in the earlier gears and no extra induction roar so to speak? The airbox flap has been known to be ill fitting and need a fettle (neckarsulms i think) if it does intermitently kick which you havent said it does.Go on mrc website and look at the power plots and compare yours you will see what i mean.

Use this power plot if you wish

[lengster1]

Thanks sonny,do you see what i mean now? My car was the same before cleaning although not to the same degree it made 379 in fourth with a full milltek system inc cats,my graphs are near identical to sonnys when i had that spec (maybe a couple of bhp down to be excact) but i then replaced the sports milltek cats with no cat downpipes and cold air induction mod and the manifold further reworked and stage 2 map which gives an even more linear power delivery all the way to 8k+ and substantially more torque,a trip to mrc would cut out all the various rolling road b*llocks as its directly comparable with many other benchmark b7s,i do accept there are variables when rolling road tests are done but i do think a car that made 338 is far enough out to suggest a problem greater than fuel etc

[DazN]

My car currently has 53k on the clock and has been serviced at Audi twice, 17,500 and 36,000, it did have an oil change when I bought it but that wasn't from Audi.

On both the Audi services it only had oil changed and on the 36k it had air filter too.

I'm suspecting it might need the plugs changing and a 'proper' service, I suppose Grizz from Unit 20 is the best man to do this!!

[DazN]

Resurrecting this thread because the car's at Unit 20 now.

Airbox flap was stuck so that's been freed, also had a full service with new plugs etc. Car is now putting out 350bhp and Martin thinks the engine has a bit of a carbon build up.

He's more than happy to clean it out but the costs are obviously going to be increased so he's suggested taking it back and giving it a good thrashing for a few weeks.

Also mentioned some additives I can buy off the shelf to assist with cleaning, will have to search on here for what to buy.

Looking forward to getting it back now!!!

[P_G]

Wynns DIP3 is the best stuff for cleaning, petrol additive and Intake spray; latter only really to be used pre-oil change / service. I get mine from Andrew Page MotorFactors; if not Wynns Petrol Gold treatment from halfords.

[DazN]

Wynns DIP3 is the best stuff for cleaning, petrol additive and Intake spray; latter only really to be used pre-oil change / service. I get mine from Andrew Page MotorFactors; if not Wynns Petrol Gold treatment from halfords.

Thanks!

I have read the intake spray can be done at any time though? I don't want to ruin anything as it's just had service and new plugs and Unit 20, would hate to undo all their good work!!

[klauster]

Resurrecting this thread because the car's at Unit 20 now.

Airbox flap was stuck so that's been freed, also had a full service with new plugs etc. Car is now putting out 350bhp and Martin thinks the engine has a bit of a carbon build up.

He's more than happy to clean it out but the costs are obviously going to be increased so he's suggested taking it back and giving it a good thrashing for a few weeks.

Also mentioned some additives I can buy off the shelf to assist with cleaning, will have to search on here for what to buy.

Looking forward to getting it back now!!!

I take it the power increase was noticed after the full service then like mine?

[DazN]

I'm working in Germany at the minute so I haven't collect it yet, going tomorrow straight from the airport and then giving it a good thrashing up the motorway

[DazN]

Hi All

So I've had the car back a couple of weeks now and it does feel better, not sure it's any faster but it's a lot more responsive and I'm enjoying it.

The 2nd dyno run after a full service including plugs didn't really show much better results, graph attached with 2 runs overlaid.

I'm wondering if it's worth spending a few hundred and having the engine de-carbon'd? Would I see a noticable improvement or am I just chasing figures...?

Thanks

[ShaneyB]

I think you'll see a big improvement with manifold polish/port but where do you stop? Manifold polished/ported, remap, filters, cold air feed, change/remove cats, exhaust??

Healthchecks and dyno runs are great but as soon as you see you're not making the power others are from stock a can of financial worms opens.

I had a budget of £1800.00 to get my work done which has now risen to £3k. I'm sure I'll be chuffed to bits with the results but even now I'm trying to work out how I can raise funds for the Milly.

My 2p's worth.

[P_G]

Hi All

So I've had the car back a couple of weeks now and it does feel better, not sure it's any faster but it's a lot more responsive and I'm enjoying it.

The 2nd dyno run after a full service including plugs didn't really show much better results, graph attached with 2 runs overlaid.

I'm wondering if it's worth spending a few hundred and having the engine de-carbon'd? Would I see a noticable improvement or am I just chasing figures...?

Thanks

Just chasing figures and to be honest, it is not a few hundred, it is several hundred to decoke unless you DIY.

[pisquano]

I think MRC asks for a bit north of £1000 to decoke

[pisquano]

I think you'll see a big improvement with manifold polish/port but where do you stop? Manifold polished/ported, remap, filters, cold air feed, change/remove cats, exhaust??

Healthchecks and dyno runs are great but as soon as you see you're not making the power others are from stock a can of financial worms opens.

I had a budget of £1800.00 to get my work done which has now risen to £3k. I'm sure I'll be chuffed to bits with the results but even now I'm trying to work out how I can raise funds for the Milly.

My 2p's worth.

frankly if you get something like 50 bhp in one go that's really good and I am pretty sure it WILL be noticeable

very curious to see where you get to Shane
I am a bit dubious about too many modifications, as it could make it hard to sell the car (when and if....) - a lot of people are more willing to buy stock cars (not always for the right reasons but hey), not least as it normally means a higher premium

[ShaneyB]

I think MRC asks for a bit north of £1000 to decoke

Over £700.00 for manifold polish & port in labour alone.