29 replies to this topic

[Elisha-The-Cooper]

standard mpi with K+N , lcb playmini twn dtm.

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any thoughts or comparison advice is helpful as noone from my local club has replied

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[Bungle]

the transmission losses seem a little high

[Elisha-The-Cooper]

your talking to a moron here? what does that mean lol ?

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[Bungle]

drag out put = 28.5

my mini was only 18

you may have a flat tyre or the brakes stuck on a bit

it's the guessed difference between power at the wheels and power at the fly wheel

when they did the power run after reaching peak power the operator took his feet off all the peddles and let the car slow down its self, this measured the losses

[Elisha-The-Cooper]

just want to know if its overall good or bad ?

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[Bungle]

not as good as it could be if your losing almost 30 bhp between the crank and the wheels

i don't know if the high diff on a MPI would do this

[Ethel]

I think that's about right for an MPI but as Bungle says you are wasting power and mpg somewhere. The high diff would mean the wheels do more revs per engine rev so drag losses would be higher measured against rpm. Don't think it should be that much difference though. An equal road speed comparison would mean more.

[Ouster]

I'm getting roughly the same on my stage 3 kitted 998.

[Elisha-The-Cooper]

=[

downer

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[Ethel]

Why's that a downer?

Your engine seems to be pulling well and you might have spent your money wisely if you discover a basic fault like a sticky brake.

You also need something for comparison to make real sense of 30 horses to turn your tyres at 104mph on rollers may not be bad at all.

[Elisha-The-Cooper]

aww cheers upper

ill have to compare it to someones at some point x

[secondopsman]

Mines going for a RR tune on the 15th but its a 998cc with stage 1 kit and a 12g295 head i will post up the results for you to compare (and laugh at) just out of curiosity an any idea approx what i should expect?
Pete

[Bungle]

did the rolling road operator say anything about the losses ?

[Sprocket]

Absolutely nothing wrong with that!!

Drag output is subjective, as it differes from dyno to dyno. 28bhp losses is a common figure on this dyno, i know, i use Minisport sometimes too.

Let me see if I can find the dyno plot for my 1400 before it was fitted with a modified head and high ratio rockers

Nope, cant find it, but the shape of the curves are the same.

have a look at this, this is the engine with the modified head and high ratio rockers, again the shape of the curves the same, just higher up the revs.

http://uk.youtube.co...h?v=D95auqEsZP0

[icklemini]

wheel alignment being out can cause a massive hit - both on a rolling road and on the track...