look at my dyno for my car at 4.5 psi on 93 octane and tell me what you see here... bare in mind its an SOHC vtec motor...




ill explain it later with kevins help but its fucked up thats for sure

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isnt that kind of low for numbers?....

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yea thats the point... well since nobody is really that interested other than you, ill tell you whats up.

se that big dip at 4000 rpms... thats vtec... crossing over at the wrong damn point. its suppsoed to be much lower, and im actualyl loosing power in vtec! what the fuck. also, look how rich it is! the motor actually shudders going into vtec. if i cuise at 4000 rpms the car shakes voiolently as the motor gets gas dumped into it.

basically, its a horrible horrible tune, and i wasted a lot of money on it. im quite upset because it may have destroyed my motor, but im not sur eon the that yet. my car is all of a sudden smoking badly and i dont know why. its not coolant any more i dont think... im going to have it retuned very very soon.

im getting a new exaust and im gonna let a real tuner who knows hondas street tune me when its done. im in really bad shape here, my car may be down for the rest of the year at this rate...

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i was about to say wtf, why is your vtec at 4k

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yea, i know. im about to loose my mind here. i paid so much money for that tune, and i got nothing but more shit and a possible damaged motor. i coudl tune that shit better, and now i wish i got blake to tune me

next week ima get a wideband and a new exaust fully setup, and ill be turning the boost to 9psi and getting re tuned.

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F22's only rev to 6500? Is that low for that motor or is that normal?

The vtec engagement shouldn't effect peak power though, something else is still not right.

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2000 S2000 Hardtop

nine.five.four.

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well he also took out a lot of timing for a reason he never really explained properly. if there is somethng wrong, it happened then and there. my motor was mint before he did anything to it. at 4.5 psi i should be at 160hp easy. at 9 psi i shoudl be at 250 hp.

and yes, the motor doesnt rev high. thats where it revs to i guess.

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well, with timing pulled that dyno makes sense but i don't understant why he wouldn't put it back in unless he was getting detonation.. which wouldn't make sense at those power levels.

Sorry, i'm not up to date on your situation. Have you done a compression check?

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2000 S2000 Hardtop

nine.five.four.

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yep. 195 195 195 195


its all good, and theres no contamination of any kind in any of the fluids, and the car runs fine except for the damn shuddering at 4000 rpms when the motor gets super super rich. what would be your guess as to what would cause such horrible figures with a turbo at 4.5 psi?

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it's a little rich in a couple places but not terrible. It goes really rich though right where vtec kicks in which could be part of your power dip.

Regarding the peak power, only thing i can think of is how much timing they might of pulled.

Do you know if the map sensor is seeing 4.5 psi? Just want to rule out the possibility of a boost leak.

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2000 S2000 Hardtop

nine.five.four.

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well, according to them, the car held 20 psi without blowing a coupler or anything. he didnt take it higher because of damageing anything on there. that is pretty impressive with some ebay piping and hose connectors. also, my gauge is tapped fromt eh manifold and its seeing 4.5 psi so i figure if its at the manifold, its not leaking.


i may be able to get my hands on an eprom burner and then possibly put my map online for all to see. i think someone needs to look at that shit.

since i really dont know my stuff when it comes to tuning, i dont know what he may have encountered other than him just not knowing how to go about tuning a car like this.

when he said he pulled timing, i sort of understand what that menas, but at the same time, i have no idea... could you explain how pulling timing out can cause me to loose that power?

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i'm not the right person to answer that really. I have a basic idea of how it works and a theory but i hate saying stuff that i'm not sure is 100% right.

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2000 S2000 Hardtop

nine.five.four.

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i know, but id like to hear the basic shit, even if its not 100%... i jsut wnat an idea of what happens. im not gonan run out and tune it myself lol.

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I know alot about tuning but i don't have any real world exp. I'll help ya out if i can.

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James C.


Check my vB garage

here's what i think...

u're vtec is kicking in too early like what most of them said.. but i dun think it's coz u're running too rich.. dat might be a factor but i think ur car just don't generate enough fuel pressure till it's at a peak and stable for the rocker arm to kick in... i always thought the factory settings for when the vtec kicks in is the most optimal but i'm not too sure bout sohc vtecs but u might have fiddled with it far enough for it to generate enough oil pressure for the vtec to kick in at that time...

i dun think running rich would fuck up the engine.. most cases i heard are for cars running lean.. then it fucks up the motor.. idk.. i might be sooo wrong..

yea.. get a tuner to look at ur fuel mapping and see how it goes from there...

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.EG6.B16A.

well the point is that it has been tuned, by someone with a really good reputation, but apparantly they know nothing about hondas. the vtec solenoid is oil pressure dependent, and typically it would engage at 2700-3100 rpms i think is what kevin said to me. since vtecs engagement point can be changed, theres no reason that vtec couldnt be fixed, but of course, i never messed with it so its not anything i know how to do. i think the timing he took out and the vtec issue is why im loosing such a large ammount of power here. i will find out soon though, im getting retuned

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What did they use to tune it? Your A/F ratio doesn't look horrible it could be a little leaner for 4.5 psi, you got to think thats at WOT, we tuned mine to where at WOT 4200rpm or above it never gets any leaner than 11.7, but I'm running a little more boost (8psi) did you do anything else to the car electrical wise? Didn't you relocate the battery? I would fist go back and check your grounding. One thing I did on mine and I told my friend to do one his caviler is run a direct ground to the ecu ground from the neg terminal. Are you getting any check engine lights? Also you low power numbers are probably due to not enough timing, if the shop is used to doing domestics they are probably used to not having as much timeing, with a penton roof desizne head (basicly most 4 vavle import heads) you can run more timing.

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well they are used to doing supras and evos mainly. mostly higher end cars.

as far as the battery goes, i did move it to the trunk and i grounded it well, but ill try that approach. one thing i did notice was one time i stalled my car really bad, and it threw the cables off the battery. so i pput them back on and bam, car ran amazingly better.... weird, so i guess the ground wasnt good. either way, i re did it again and its even better nw, but ill run a direct ground ot the ECU. id be interested to run a dno and see what im making right now. plus, im gonna change my spark plugs over to the ones i got originally. maybe the tuner replaced them with ones that arent in the right heat range?

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Marc,

Call Mainstream Performance here in Atlanta. They are a small shop but are very cool and have alot of experiences with Honda's.


5014 Frank Aiken Rd
Building B
Powder Springs, GA 30127

Tues & Thurs: 10am-8pm
Wed & Friday: 10am-8pm
Sat: 10am-5pm
Sun & Mon: Closed

Phone: 678.567.9384


http://mainstreamperformance.com/

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if you do the ecu ground then the best thing to do is run a 10 gauge cable to it then solider the conection.

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