91'lude, sorry no exterior shots yet.
I can't wait to finish everything and get the car cut + polished before any photoshoot.
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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