higher compression - how would it affect A/F?
 

how would higher compression effect air fuel mix ?

after doing pistons and gasket mod i think im running rich

could just be me though ps air filter is clean and tb boots are fitted correctly v-stacks fitted and the same zorst as before only thing diff is pistons and thinner gasket

thanks

Re: higher compresion how would it effect A/f?
 

It should not affect it

Re: higher compresion how would it effect A/f?
 

ok cool, fuel economy is better than before just smells like fuel, will pull plugs at some point

ps running 99super

Re: higher compresion how would it effect A/f?
 

What did you do Velocity Stack wise?

Re: higher compresion how would it effect A/f?
 

what do you mean ? i had them in before, running factory pro 70/35 midrange stacks

http://i357.photobucket.com/albums/o...0012011686.jpg

Re: higher compresion how would it effect A/f?
 

Could be something else random like the temp sensor keeping it on enrichment, also super is a bit denser which could affect it.

Re: higher compresion how would it effect A/f?
 

yeh head that the MAF (map?) (i think its called) goes as well ???

Re: higher compresion how would it effect A/f?
 

Well, MAF is mass air flow, I don't think SV uses one. MAP is manifold air pressure which it does use.

Re: higher compresion how would it effect A/f?
 

must be the map then :p

will look in to it and see if i can test them some how

Re: higher compresion how would it effect A/f?
 

Well you have a few things on the go, could also be something daft like TPS needs doing. Or nothing at all and you got a whiff of petrol left over from cold start that just vaporised.

If it feels to run alright then pop it on a dyno and run it up, see what you get.

Re: higher compresion how would it effect A/f?
 

Was just interested to know what you were using and what benefit you got from them?

Re: higher compresion how would it effect A/f?
 

tps wasn't done that long ago, will be taking it to stevejordan at some point to remap the stock ecu, but just wondering if something is up at the moment (ps aparently the pair system can f*k with A/F readings so going to remove that at some point.

ahh ok :) they move the power band more in to the mid range, but still add a little on top end as well.

to be honest i dont think they would work that well with the stock air filter as the filter plastic around the element covers half of the front stack, so to me looks like the filter been there would hinder performance of the stack, going to get a BMC filter though for the remap and run that over stock with a desnorkled box.

Re: higher compression - how would it affect A/F?
 

PAIR is as far as I know only open on overrun, so not really going to do anything to the AF unless it sticks, and then not much.

Re: higher compression - how would it affect A/F?
 

ohh ok, some one on sv rider said it made a fair bit of diff so suppose his was probs faulty

Re: higher compression - how would it affect A/F?
 

Well if it's any consolation, I was just told by DynoJet that I should have the PAIR disabled while using their autotune module. Here's the email they sent me.

Re: higher compression - how would it affect A/F?
 

Depends on how far you have gone with the compression and what else you have done. Generally our tuned ones go off rich through the midrange after the work but no two bikes are the same. Variances in the stock fueling and injector flow rates play a part too.

Tbh if you have done that work don't guess, get and air fuel run done. I've actually got a graph from a stock gsxr which we mapped last week, 10bhp gain. Shows how far out even a stock bike can be.

Re: higher compression - how would it affect A/F?
 

8-10thou middle layer of gasket job, busa pistons,stock system with stubby slip on (i know its pants for power but i like it so its staying), 70/35 velocity stacks,billet tank risers,High lift exhaust (curvy intake)

thats it i think

i know it needs tuning thats evident (soft top end) but if its over fuelling then i was going to pull the snorkle for now to get some more air in until i have the cash for the dyno (and the other thing i messaged you about)