looks a bit like VTEC is engaging a bit too lowQuote:
Originally Posted by ProECU
Printable View
looks a bit like VTEC is engaging a bit too lowQuote:
Originally Posted by ProECU
Thats awesome power man, cant wait to see some results on the strip.
Do you have any better overall shots for the car?
why did you remove the car id and description from the dyno graph? is that your graph or someone elses :thumbdwn:
fly_vti, because this is a public forum and I don't want to post trackable data/details. Wouldn't you?
ProECU, the dip is a result of vtec transition at 6krpm. The low cam want so much fuel before the transition and the vtec cam just want all of that fuel disappear asap. The area after vtec transition is rich and noisy on knock sensors log. Interesting car to tune btw.
IMHO from the dyno printour, if vtec is lowered the midrange would gain around 10-20rwkw but my tuner did not want to do it because we tried it before with a SC and we lost power.
I am using IK27 at stock gaps with aem c2di twin sparks.
91'lude, sorry no exterior shots yet.
I can't wait to finish everything and get the car cut + polished before any photoshoot.
Thats understandable, after being in and out of the workshop so much, they do tend to get dirty.
Interesting you say the fueling requirements are different...Quote:
Originally Posted by 9krpm
What engine management are you using? The factory ECU not only interpolates between load/rpm points, it also interpolates between the low & high speed tables upon vtec transition.
If your engine management doesnt have dual tables, then this could contribute to what you've described.
In any event, I would try removing fuel before vtec and add it right after to even out the transition.
None the less, fantastic result.
Iwould suggest doing the same, only with timing as wellQuote:
Originally Posted by ProECU
Bloody Unreal!!
nice results you got there, can't wait to see more pics :)
thanks proecu and saxman, we tried to take fuel out but the engine did not like it at all. It's actually asking for fuel before vtec and less fuel after vtec, a bit more fuel after that and then less fuel after around 7 or 8krpm. Interesting engine to tune. I will post a fuel map graph when I have time tonight.
I dropped the knock control volt table down a tad and knock control is kicking in this morning at around 6600 rpm even with avgas. We tuned this car with very conservative ignition timing and fuel so it's more than likely that it's from back ground noise but I think the car is going back on dyno soon.
Proecu, I am using the aem ems. The aem ems has a vtec fuel trim function. I will do a bit more home work on this. Where about do you tune normally? Would you mind dropping down to Willall racing for some coffee/beer while we retune the car next time?
btw I got 12.9 @ 119mph yesterday at the track with 17psi
it's either too much bog or wheel spin
I had 4 runs and then the intercooler hose blew out on me :(
I will need a lot more practice on launching and will be back again for my 11.
MateQuote:
Originally Posted by 9krpm
i'm in Adelaide, but i'd be interested in coming down to take a look.
Shoot me an email on the below address, we'll take it offline
Cheers
Ev
have you tried doing a dyno run on just the low cam and just the high cam and overlaying to find the optimal vtec point? I do all my tuning on obd1 hondas, but that looks to me exactly like vtec being set too low
saxman, no we have not try that method. We left the vtec at 6krpm.
I still think the dip is caused by AF ratio dropping into the 11 or lower. We will try the fuel trim function for vtec. It will be more effective and should hopefully clear this up.
I'll try to talk the tuner about your method, overlaying the 2 cams dyno runs, to find the effective vtec transition next time. Hopefully he will give it a try. BTW how low do you set the vtec cam when you do the "vtec cam only" dyno run?
4000rpm is low enough, or select a point low enough where the car is happy to live, your tuner should be OK with this, not a difficult concept.
doesn't have to be anthing rediculously low, just something obviously lower then where vtec should be. for the s2k motor, 4k sounds like a good number to me too
what I would do is overlap the two dynos, then set the vtec to about 200 rpm or so below where they overlap, and bump timing slightly before, and drop a little timing afterwards to smooth the transition
thanks guys
Nice to meet proecu and the honda owners today.
You guys had some very nice rides.
proecu, you can download the latest aem ems software from here
http://forum.aempower.com/bbs/viewtopic.php?t=8610
We'll catch up soon. You still own me a ride in your beast m8.
I did not want to hold you up today :(
wo wow wow owowo.... very impressive, what compression you running?
mate, our rides are nowhere near the standard of your beast...
very ****ing impressive car !
yes i can say this s2k is fuking mental!!!!! i had the pleasure to be a passenger too today....its just shits over all our cars...
Thanks guys but it's not that great.
I would love to get the car to idle and run smoothly like the proecu does on your rides.
Hope you get your idling issues sorted out, props to you and your development team :)
9:1 compressionQuote:
Originally Posted by mini_s2000
I think part of the idle problem is that the EMS minimum vacuum is 14.9 or something like that.
Hondas tend to like about 20-26 inHg to idle under 1000rpm.
those load points are not fixed and adjustable proecu
At idle, my boost gauge is around -550mmHg, and the map normally hover around -11.56 and -8.71.
I got it to idle around 1000rpm at one stage but then all of the sudden it changed and stalled in traffic :confused: The aem has many idle parameters. Right now it idle at 1300.
I think my high idle ignition timing is causing this.
BTW what ignition timing do you run at idle proecu?
i heard s2000's engines blow up quite easily cause its already heavily tuned
what will the turbo do to it?
yeah i know its adjustable in the software, but the minimum is -14.9.Quote:
Originally Posted by 9krpm
Try going lower than that......software doesnt support it from what I saw.
Your base timing should be as per the timing mark.
I dont know what the factory setting is from factory, but i'd definately stick to that.
It might be worth while talking to Brett for some ideas....
He loves the s2000 !
blow it up even quicker :DQuote:
Originally Posted by chicken8
J/k a lot of people runs 10psi on stock compression (11:1) with stock internal As long as you have the hardware and software with conservative tune then it's quite reliable :cool:
Thank proecu. As suspected my timing is way too much at around idle. I will look more into this idle issue. I never had much time before but will get some more time to play around with this.
I will talk to Brett once I am more happy with the base tune. I may get him to fine tune it to see if there is any difference between Brett and Martin ;)
Very Nice job their....
The idea of a turbo'd s2k really interests me :)
DudeQuote:
Originally Posted by 9krpm
I dont mind spending some time with you on a weekend trying to sort out your idle issues.
This is something that can be done without a dyno.
that is insane... turbo s2k how much would it cost?
just finished reading the whole thread, you have done lots of work 9krpm, im still in my early stages of purchasing my s2000.
any updates ... pics times etc.
Btw a well done job ... how is the car going now anyway? anymore trouble or most of them should be sorted out...
peace. !