Smithy's 940 Dyno Videos

[smithy]

the car will be hitting 350 whp no probs in the next 6 weeks

[popuptoaster]

Originally Posted by smithy

this is a graph from last year i think november it was a totally standard engine ,standard ecus,t38 hybrid and a cmd unit that controls the fuel.but i didnot connect the maf cut so i was hitting fuel cut at 4200 rpm.i will find the dyno run for the video very soon.if anybody knows anything about turbos then they will know that the t38 hybrid isnt even working at 17 psi witch this graph was at .the turbo does not work properly till it gets to above 24 psi.

Whats the fuel cut out command unit? is it easily available?


Its ok, if its the zenner diode trick just found it on turbo bricks.

[smithy]

Originally Posted by popuptoaster

Whats the fuel cut out command unit? is it easily available?


Its ok, if its the zenner diode trick just found it on turbo bricks.

no im not using that mate im using a dynojet cmd unit that i can map the fuel system and the maf signals and a boost solanoid but i only connected the fuel map and that rolling road was only the 1st map we did mate.but everything else will be connected up now so i can properly map the car

[popuptoaster]

Originally Posted by smithy

no im not using that mate im using a dynojet cmd unit that i can map the fuel system and the maf signals and a boost solanoid but i only connected the fuel map and that rolling road was only the 1st map we did mate.but everything else will be connected up now so i can properly map the car

Aah right, no need for all that for me just yet i think.

[smithy]

Originally Posted by popuptoaster

Aah right, no need for all that for me just yet i think.

not yet for u but in the future u never know because i know u have plains mate and i im only interested in whp too

[TheJoyOfSix]

Originally Posted by smithy

the t38 hybrid isnt even working at 17 psi witch this graph was at .the turbo does not work properly till it gets to above 24 psi.

I have to take issue with that.

A turbo can be working, and working hard at ANY psi - just because it's a large (ish) turbo does not mean it needs to kick out high boost numbers to be 'working'. Most truck turbos are larger than T38's but will only run 18-30psi flat out depending on circumstance.

Equally, high boost pressure does not mean the turbo is working more efficiently, or even providing a lot of air into the engine. If you're ramming the charged air down a 2" pipe (for example) into an engine you'll get a high boost pressure but a low cfm figure. Use a 3" pipe/intake and the boost pressure will drop but you may flow more air.

It's all to do with the size of the turbo in relation to the amount of air required, the ability of the engine to provide enough exhaust gas to spool it, the charge air temps, effectiveness of intercooler, efficiency of exhaust system to remove the gases, size of pipework, size of intercooler etc. You may well find your T38 at 24+psi is operating outside of its efficiency ratings given the rest of the package.


I see the dyno readout was done at HLM - general consensus is subtract 15% from their figures and you may be nearer the truth.

[smithy]

Originally Posted by TheJoyOfSix

I have to take issue with that.

A turbo can be working, and working hard at ANY psi - just because it's a large (ish) turbo does not mean it needs to kick out high boost numbers to be 'working'. Most truck turbos are larger than T38's but will only run 18-30psi flat out depending on circumstance.

Equally, high boost pressure does not mean the turbo is working more efficiently, or even providing a lot of air into the engine. If you're ramming the charged air down a 2" pipe (for example) into an engine you'll get a high boost pressure but a low cfm figure. Use a 3" pipe/intake and the boost pressure will drop but you may flow more air.

It's all to do with the size of the turbo in relation to the amount of air required, the ability of the engine to provide enough exhaust gas to spool it, the charge air temps, effectiveness of intercooler, efficiency of exhaust system to remove the gases, size of pipework, size of intercooler etc. You may well find your T38 at 24+psi is operating outside of its efficiency ratings given the rest of the package.


I see the dyno readout was done at HLM - general consensus is subtract 15% from their figures and you may be nearer the truth.

hlm dyno is spot on mate i put my s40 1.8 vvt on the dyno showed and it showed factory figuies of 122 bhp crank .and the 940 is using 3in piping euerywhere and 3intb too.and this turbo is designed to run up to 2.2 bar .the engine that is going back in the car is forged and also a big valve head and a custom inlet manifold .it was the ecu backing the turbo off with fuel cut because the t38 was pushing alot more air than t35 was doing so that is why i was hitting the maf limit.but take it from me this car is very quick and upsets alot of peeps.and it also did a 13.9 easlely on the strip and that was with a t cam .also ive been on 4 different rollers with this car and they all gave higher figuies

[Jod T5]

Originally Posted by smithy

the car will be hitting 350 whp no probs in the next 6 weeks

WHP....? What is that in terms we may understand...Factor in HLM rollers and 220 bhp?...

Dear me, am i fed up with your bullshi1..?

One of your six weeks are up...

Put up or shut up...Oh yes i expect there will be problems with the graph..., car misfiring or one of your stock excuses....

AGAIN...

Jod

[Jod T5]

Originally Posted by smithy

this is a graph from last year i think november it was a totally standard engine ,standard ecus,t38 hybrid and a cmd unit that controls the fuel.but i didnot connect the maf cut so i was hitting fuel cut at 4200 rpm.i will find the dyno run for the video very soon.if anybody knows anything about turbos then they will know that the t38 hybrid isnt even working at 17 psi witch this graph was at .the turbo does not work properly till it gets to above 24 psi.

This is a poor map with the mods you boast of...your excuses pour out again....It is similar to a 850T5 Rica map....


Jod

[smithy]

Originally Posted by Jod T5

This is a poor map with the mods you boast of...your excuses pour out again....It is similar to a 850T5 Rica map....


Jod

who is boasting im not i try to explain the problems i have to help over forum members if they have rsimilar problems with modding 940s .what is so wrong with that .im still running standard ecus aswell and the hlm thing well we all have our own personnel views on that one.but when i get my car back up and running and tuned then i will take the car to the next dyno day where ever that may be then you can say something about them figuires too.