The PROS of UR crank pullies and the track

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Aug 7, 2007 | 05:31 PM

#81

typeR

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From: Port Richey, FL

Quote:

Originally Posted by mrsteve

Shift points will change but the RPM at which 2nd, 3rd, or 4th gear begin after a WOT shift will not. It's all mechanical. At a certain MPH the motor will spin at a certain RPM given a certain gear. It just so happens that the minimum RPM the engine spins after a WOT shift into 2nd, 3rd, or 4th will be 4,800 RPM to keep the car in it's powerband.

what im saying is the other driver may drive not as aggressive and have his car on a more seldom WOT run in D5 shift eralier than urs causing shift early enough to be just out of vtec ...anyone wanna do a ECU reset then go first run wot in d5 and see what happens... after a few passes the car will shift later and later

Aug 7, 2007 | 07:17 PM

#82

EL19

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From: DC

Quote:

Originally Posted by CLS6SpeedNupe

im getting my car dynoed thursday afternoon, i got a felling that the car isnt running strong. I know everyone says that the Stock ecu on our cars are suppose to be fine wit bolt ons but like its been said, every car is different so we wont truely know till the car is tested.

hey we all slummed at the track cuz of the heat...no way im hittin consistent 14.5s with all the shit i got in my whip

Aug 7, 2007 | 07:30 PM

#83

fsttyms1

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From: Appleton WI

Quote:

Originally Posted by NightRider

IF you have an AT and the tranny early shifts out of 1st, you do miss VTEC in second for just a moment, but not if you gate shift. It does miss VTEC in 4th even if you take it to 7200rpm in 3rd, damn double overdrive! With the 6MT you should still hit VTEC in 4th though.. faster revs are always a good thing IMO

mine never dropped out ov vtec going into 4th with the AT if i shifted at redline (just before the revlimiter kicked in)

Aug 7, 2007 | 08:04 PM

#84

NightRider

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From: Lakehood, CO

Quote:

Originally Posted by mrsteve

I don't know where you guys are getting this stuff from. Watch this video of my automatic car. The transmission shifts automatically from 1 -> 2 around 6,700. I then use the SS mode to shift at 7,100 for 3rd and 4th gears. All gears begin at 4,800-5,000.

http://photos.imageevent.com/mrsteve...S%2020-110.wmv

Theoretically even with the crappy ratios of the AT, 1-3 should be in VTEC when shifted into. You are saying you have never driven the AT in SS or D mode and had it early shift on you? I'm not talking 6700, more like 6400. If it shifts out of first at 6400 it just misses VTEC in second. Look at ":03" on your video and see how right as the needle is falling on the upshift to 2nd (6700), the speedo needle is crossing "40". If you gate shift at 71/7200, the speedo needle is crossing near "50" when the needle falls on the upshift to 2nd. I will get a video in a few minutes and look at this and the stated rpms vs ecu rpms thing.

Aug 7, 2007 | 08:11 PM

#85

NightRider

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From: Lakehood, CO

Quote:

Originally Posted by fsttyms1

mine never dropped out ov vtec going into 4th with the AT if i shifted at redline (just before the revlimiter kicked in)

It is fine line with the needle reading, but seems to me even with a redline rev limiter brink shift, the high cam is not on for a moment in 4th. Too early yet in the night to give this a try...

Aug 7, 2007 | 08:31 PM

#86

typeR

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From: Port Richey, FL

Quote:

Originally Posted by NightRider

It is fine line with the needle reading, but seems to me even with a redline rev limiter brink shift, the high cam is not on for a moment in 4th. Too early yet in the night to give this a try...

more than a moment...ti drops way down like 4400 ish maybe even 4200 cant remember

Aug 7, 2007 | 10:34 PM

#87

mrsteve

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From: Leesburg, Virginia

Well yeah.... if you don't shift at redline you aren't going to remain in the powerband when the next gear engages. BUT the design is not flawed. If you shift correctly you will remain in VTEC the entire time.

Aug 7, 2007 | 11:57 PM

#88

NightRider

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From: Lakehood, CO

Ok I tested out the rpm reading on the vtec controller several times in first and second gear...I took it to 7100 and shifted, and also let it hit the rev limiter a couple times (boo), the max rpm reading at 100% throttle did not break into 7000 ever.
If 7100=6900 then can it be assumed the tach is 200rpm off? Seems the ECU knows what it's doing...

EDIT: Couldn't get any video, my brother jacked my camera yesterday

Aug 8, 2007 | 09:31 AM

#89

typeR

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From: Port Richey, FL

Quote:

Originally Posted by NightRider

what size tires ?

Aug 8, 2007 | 10:14 AM

#90

Joe5.0

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From: Metro Detroit

it wouldnt surprise me at all if the stock tach is off, most oem tachs are.

I only trust a aftermarket tach that reads off the ignition.

I mean hell, look at how accurate out speedometers are

Aug 8, 2007 | 01:29 PM

#91

NightRider

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From: Lakehood, CO

Quote:

Originally Posted by typeR

what size tires ?

Yoko YK420s, identical to stock specs I believe

Aug 8, 2007 | 11:22 PM

#92

NightRider

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From: Lakehood, CO

I have video of the vtec controller rpm reading and 1st gear redline gauge test, just can't host my software is acting up right now.

Aug 8, 2007 | 11:41 PM

#93

RUF87

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From: Plano - Texas

Quote:

Originally Posted by ChucksCL-S

No, it is reving up to higher rpm's FASTER with the pulley because of it's lighter weight. This should give benefits of more power, sooner. Third is used up sooner now because the engine is spinning more freely. Everyone else has noticed this.

I'm with you, I need to sleep on this one . . already had some wine, so I'm not top of the class. However, I can see how the gearing would be impacted by the engine turning quicker . . . . they are both intrensically tied together. What I think can happen is that this would result in the car getting from point A to point B sooner, which in fact could result in a low ET, and a lower trap speed . . .

Okay, whatever I said :

All I can say is don't get hung up over trap speed vs ET. When I ran 14.7s with just lighter weight wheels and tires, my trap speed dropped to 93MPH, well below most of the other guys that night who were running 14.8 - 14.9 and where trapping 97-98 MPH. The lighter weight tires really helped me get off the line quicker and post better 330' times, so I had let time to get the speed up . . .

Ruf

Aug 9, 2007 | 01:29 AM

#94

NightRider

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From: Lakehood, CO

http://img531.imageshack.us/my.php?i...1000881ek5.flv

Aug 9, 2007 | 02:08 AM

#95

NightRider

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From: Lakehood, CO

Here is the link to the 7500 rpm thread, eventually you even get to see both videos

Sorry for the post whoring

https://acurazine.com/forums/showthr...94#post2694794

The vafc video is in 1st so it's kinda quick, I tried 2 second gear ones on the highway and they were too jerky. I know the acceleration seems slow, but we are a mile high.