766 replies to this topic

[slindborg]

stage 2 has better area under the graph (and thats the important thing!) ffs, put the fecking power and torque on the SAME axis resolution! makes working things out far easier

[SteveM]

I know, it took ages to plot that lot on two different axis resolutions

[speedster]

Not sure what stage # my machine would be classed as... but as far as I can make out am ahead of the iTB's + Milltek setup in both Torque and Power.... BTW not bashing the iTB's.... just surprised!

[Crispy]

Notice also how much flatter then lines are for the TB (smoother power delivery) and how there is hardly any tapering off at the top end -- in my opinion its these kinds of differences that add extra value to the package (over and above the x BHP increase).

[speedster]

Notice also how much flatter then lines are for the TB (smoother power delivery) and how there is hardly any tapering off at the top end -- in my opinion its these kinds of differences that add extra value to the package (over and above the x BHP increase).

Note the scaling on my torque graphs, my run is pretty smooth too. I'm between 140 and 167 lb ft across the most of rev range plus appear to be making more high end torque than the iTB's. Torque starts tapering off from 165 lb ft at around 5000'ish, I'm hitting the limiter (low setting) at around 130 lb ft at (I was lean above 5200 RPM on this run).

The iTB's appear to be running between 140 and 152 lb ft across most of the rev range, tapering down from 140'ish lb ft at 5600'ish ending up at 122 lb ft.

Not much different between iTB's and my single 68mm... Wonder how we will fair out with cams?

[MartinS]

To confirm, the TB's add 25bhp to whatever state of tune you have? i.e. a stage 2 that (I thought) was around 160-165bhp would become 190ish? Martin s

[DutchMike]

......... Supply only kit price should be sorted today, working with Webcon to reduce the price a little (depends on their suppliers fixing some of the componant prices). .....

.......

Any new on this John? Cheers.

[davemate]

At the moment i am trying to work out the difference between just buying a turbo or vxr, super charger or ITBs. Would it be possible to find a brief rundown somewhere or have a guide as i find it all rather confusing at the moment. im interested in the speed (obviously) power delivery, relyability, tunability, etc.

[paulf-cam]

At the moment i am trying to work out the difference between
just buying a turbo or vxr, super charger or ITBs.
Would it be possible to find a brief rundown somewhere or have a guide as i find it all rather confusing at the moment.

im interested in the speed (obviously) power delivery, relyability, tunability, etc.

Ah, i see you are after the holy grail of the this thread.

There is little or no information about how VXR, ITBs or supercharged NA compare unfortunately. The only way to get a decent idea is to get three cars to the same dyno on the same day and run the numbers.

The other other way is to get someone impartial who has driven all three to give his opinion - very unlikely to happen unfortunately...

Ta,Paul.

[JG]

I've just had an idea. Lets get a standard Na a standard T A VXR an SC an ITB a stage 1 T and a stage 2 NA all together. maybe at an airfield. we all drive each others cars and then capture the drivers thoughts. I'll take it upon myself to write the article. And will no doubt do better than the road and track mag a few years ago

[Crispy]

i'm up for that.

[Arno]

ffs, put the fecking power and torque on the SAME axis resolution! makes working things out far easier

Create an account and stick 'em on http://www.dyno-plot.../dyno/about.htm

Makes it easy to compare to any other car/engine as well.

Eg. a Westfield with a 2.0L XE Opel/Vuaxhall engine does this:

http://www.dyno-plot...chards-Bros.htm

Bye, Arno.

Edited by Arno, 06 June 2007 - 05:44 PM.

[slindborg]

it also means you can check to see that the RR is setup nearly properly too

[davemate]

that sounds like an excellent idea, maybe thorney might be interested in this as i am sure lots of people are interested in the throttle bodies, although i do understant it is early days yet (well, you know what i mean!) i would be happy to provide a stage 1 na.

[Thorney]

I#d like to do another VX220 dyno day for sure, and in many respects I guess the timing is right so we'll try and sort that.

[Karlosfandango]

Stage 3 Na reporting for testing

[DutchMike]

Let's try again

John?

......... Supply only kit price should be sorted today, working with Webcon to reduce the price a little (depends on their suppliers fixing some of the componant prices). .....

.......

Any new on this John? Cheers.

[RCduck7]

From what i read i understand the engine revs amost like a v-tec with TB's. I had a Honda S2000 as my former car and i know shifting up at a high rev range was important to not loose power when your in the next gear. The vx220 has only 5 gears... So, my question is can you stay in that powerband when shifting up? And what rpm (minimum revs) should you shift not to loose power? Or does the vx220's torque means this isn't much of an issue? RCduck7

[NickB787]

I've just had an idea.

Lets get
a standard Na
a standard T
A VXR
an SC
an ITB
a stage 1 T
and a stage 2 NA

S/C Car ready here

[Crispy]

From what i read i understand the engine revs amost like a v-tec with TB's.
I had a Honda S2000 as my former car and i know shifting up at a high rev range was important to not loose power when your in the next gear.
The vx220 has only 5 gears...
So, my question is can you stay in that powerband when shifting up?
And what rpm (minimum revs) should you shift not to loose power?
Or does the vx220's torque means this isn't much of an issue?

RCduck7

I've not driven an S2000 unfortunately so I wouldn't be able to make the comparison.

When pushing i'm changing just before I hit the limit, but I wouldn't know for certain if I stay in the powerband or not, or how the torque effects things.

I know its good fun though