Paul_C
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| posted on 3/5/05 at 09:47 PM |
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i-VTEC
This web site has given me many happy hours at 'work' Thanks for all your contributions.
Just to add to the VTEC thread according to a Honda brochure the Civic Type R has i-VTEC and to quote 'Add Variable Timing Control to match
inlet-valve opening to the engine load even more precisely. Bring on more power and torque lower down, so there's a smooth progression right
across the rev range, instead of a sudden peak at the top end'.
My interpretation is that they have added variable timing to the inlet camshaft in addition to the slow and high speed cams for both the inlet and
exhaust valves.
VTEC was described back in the October 91 issue of the defunct magazine Car Design & Technology
Can't beat a good V8 but can't afford the petrol.
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atomic
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| posted on 4/5/05 at 10:17 AM |
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The K2 ecu is about £350 with a base map installed. If you then want/require a RR session then you looking at another £200 or so, this with someone
who knows about engine mapping.
I don't think the megajolt system will able to control the V-Tec system in the correct manor ie for engine reliability.
Why change the way/method of V-Tec engagement from the way Honda designed it in the first place.
Having now had quite a bit of experience of V-Tec with my F20C engine, best solution is to go for an Emerald/AEM15 (Gems) ecu just because they have
base maps. Building a map from scratch is a real pain and almost impossible without a RR and good knowledge of this type of thing. What sort of price
do you think it would cost just in RR time alone without a bse map, more that 3/500 I can tell you.
[Edited on 4/5/05 by atomic]
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MonkeyHunter
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| posted on 4/5/05 at 11:01 AM |
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James, im planning on using Megasquirt II when its out, on my Turbod VTEC.
I cant see that the basic mapping will be particularly challenging, as I have read the maps off of the ROM in the stock ECU. So I plan to start with
those, and some basic turbo multipliers and take it from there. Hopefully I wont blow the engine up, but if I do I have a spare 
I think the Honda VTEC system is very good, you?ve got to hand it to them, the engine I have, from 1990 produces 170PS if used with the JDM ECU,
that?s not bad for a 1.6L engine!
I have had my turbo manifold made up so I can run several turbos, either the MHI TD04 from a WRX STI using a special funnel (plan a) a T3 or a T4.
I keep meaning to put a website up but I haven?t got round to it yet. I have put a couple of pics in my gallery now though.
Scott.
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James
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| posted on 4/5/05 at 11:57 AM |
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quote:
Originally posted by ned
james,
probably because if you can find a few grand for an engine, wjhy skimp a couple of hundred for an ems?
and also you spend the money on the engine, build you megajob and then blow up the engine, what a fool you would feel.....
Ned.
ps thats assuming you even managed to hook up all the sensors and get it mapped yourself, how many engines have you mapped? remind me please  oh and
let us know when you find a rolling road that'll do your megajob too 
[Edited on 3/5/05 by ned]
Ned,
S2ks will come down in price in the time frame I'm looking at.
And I'm not sure if I call ~£500 a couple. You must be richer than me!
Obviously, if I "blow up the engine" I'm not gonna be too pleased. But I really don't think that's too likely-
I've got a Pinto to practice on for a start.
Obviously, I've not mapped any engines but until three years ago I'd not welded, or rebuilt engines. The number of MS success stories
suggests it really can't be that hard.
MonkeyHunter,
Sounds really interesting! Please do a site.
Glad to hear someone's attempting MS and V-tec. Would be really interesting to see your results. I much prefer the Locost ethos to Ned's
cheque book solutions to everything which with a little brain application can be done oneself!
Cheers,
James
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"The fight is won or lost far away from witnesses, behind the lines, in the gym and out there on the road, long before I dance under those lights."
- Muhammad Ali
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atomic
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| posted on 4/5/05 at 12:06 PM |
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Supercharing is a better option for the V-Tec engines. There are server of the new generation superchargers which use a turbocharger housing and
turbine but are belt driven of the crank which can used.
MonkeyHunter, how have you read the maps from the stock ecu?..
Depending on the ecu, you may have another option, which would be to send the ecu to Hondata (http://www.hondata.com)and get the mod which allow you
to remap the ecu at will.
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Volvorsport
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| posted on 4/5/05 at 12:16 PM |
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hmm , lotus had an offering of a hydraulic system before the japs got into it !! - porsche alters thetiming of cams by adjusting the tension in the
cam chain .
i think if you use MsnS youll have an output for controlling the solenoid , hell just needs to be an rpm controlled switch - which will only operate
within certain parameters that you can program into the software , eh ?
Megasquirt is as good as GEMs since gems has only one fuel map to play with and can accept knock sense and does boost control - its just a case of
figuring it out - you do need to get a wideband sensor definitely - mine was £230 for everything including controller .
the only downside for MS is the customer back up - altho the chap im dealing with is starting to do it professionally so its getting better .
www.dbsmotorsport.co.uk
getting dirty under a bus
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NS Dev
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| posted on 4/5/05 at 12:26 PM |
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Emerald = £380 incl flying lead loom, base map, software etc etc = bargain in my book. Depends how much of a price tag you put on time +hassle.
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MonkeyHunter
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| posted on 4/5/05 at 12:45 PM |
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Atomic
to get the map off, i unsoldered the ROM, and slapped it in a reader. There is actually quite a lot you can do now with some of the stock Honda
ECU's, check out This Site I generally prefer Turbo over supercharged, and it works out cheaper.
Engine management is something Id like to do myself, mainly just becasue i can, but also becasue it means I can spend the spare cash on things like
the Quaife ATB that should be arriving today. 
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