My 20v quarter mile times... horrible... wtf?

[aaron7]

I did horrible in the quarter... I think I need more tuning.

89 MR2
5 speed
20v, first gen silvertop
Intake to Tom's style scoop (cold air)
20v header, 2" exhaust, no cat, straight thru muffler
Megasquirt
185/60/14 Yokohoma Advan's on light rims

Tires gripped awesome, except for last run where they spun a little when I hit second.

I never left third gear. and I wound out all 3 gears to about 7100rpm (just before the power dropped off)

Now, don't make fun of my reaction times... I hadn't raced in 3 years!


Race 1:
R/T 1.206
60' 2.199
1/8 10.332 @ 65.14
1/4 16.625 @ 76.21

Race 2:
R/T .943
60' 2.7
1/8 10.828 @ 67.11
1/4 16.610 @ 85.85

Race 3:
R/T .958
60' 2.669
1/8 10.804 @ 68.16
1/4 16.527 @ 86.48

Now... I never understand this stuff... why was my fastest (time) run with the slowest trap speed?

So besides tuning... any ideas?

[aaron7]

This was with a full car load:

Girlfriend - 120lbs
2 subs and boxes + amps
Spare

I'm not running the stock ECU. I have the fuel cut set at 7800 currently, but anything over 7100 drops in power.

I launched at about 4000rpm. Little spin, but no bog.

The first 2 runs were with the girlfriend, last run was alone.

[ToyotaTechGeek]

have you put this thing on the dyno yet? is your megasquirt dialed-in yet? you said besides tuning...hmmm, tuning is going to be the key, dude. the 20V is all about revs which makes it a terrific candidate for the dorifto crowd. sustained revs. as for drag racing, hmmm, i don't know. maybe with the new engine you are still a noob at say launching the car.

[aaron7]

No tuning has really been done. I'm running so rich it smells like raw gas behind the car. Problem is, I don't know how to tune, nor can I find anyone to help me with it!

[ToyotaTechGeek]

in the stone ages of engine tuning, i was taught that 'lean is mean'. of course now the engines can and do suffer from predetonation with catastrophic results. if you are running that rich, hell yeah you are going to be slow. you need to get on a dyno and at least get a baseline AFR map and a dyno plot so that you can tune. many times the dyno operator(s) know how to tune. now you have a megasquirt, well you will have to find someone who can support the tune there.

[aaron7]

Yah, my timing is set at 14btc i think and the air/fuel is 9:1, but it might be 9btc and 14:1 fuel... I dunno. That's what I was told.

[ToyotaTechGeek]

9??? ohmyfarkinggosh! in an NA car??? geeeeeeeez! you are just pissing fuel...pissing like a racehorse!

[aaron7]

yah, it is. smells so strong. But I can't find anyone to tune my megasquirt!!

[NESW20]

get a tune. i'm sure right now you're running way less than stock horsepower in that thing. oh, preignition and detonation are two seperate things. they have many similar effects on killing an engine quickly, but they're not quite the same, hehe.

-Mike

[MRQtwinturbo]

something doesn't add up....you hit the 1/4 mile still in third???...

[ToyotaTechGeek]

it's a 20V...it revs forever and ever

[aaron7]

Yup passed the finish line around 7400rpm.

[MRQtwinturbo]

looks like it needs better gear ratios..seems like it revs and revs but not going any where all too fast.....get your 60' times under 2.0 and you'll see better ETs...

[aaron7]

It's either a C52 or C56.

[Timberland]

Something doesn't make sense. Your best run had your worst 60ft, and your worst run had your best 60ft. 2.6 60ft is pretty nasty, and you're saying you had relatively no wheelspin? Your traps seem kinda high for mid 16s....

Call me crazy, but I think you might want to try a different track. These times just seem weird to me!