Cam on Monday

[mexi]

hmmm with my sidewinder i got better 60ft and a ton of low end torque...my best 60ft so far is a 1.79 before the cam i was 2.0*'s

here is a vid of mine leaving the line RaceVideoForums.com MMP TNT Mexi 300c 12.4 HD - Car Videos on StreetFire

[turbohips]

Well another reason why my 60 probably hasn't improved is the fact the last two times at the track I had a DA of 4400+ and 3500+. I'm sure with a negative or zero DA I would have a much different result.

[EricG]

I don't think that DA has too much an effect on your 60 foot time. Now overall e.t. - somewat, and trap speed - definitely. 60 foots are very dependant on track prep and car prep.

The Sidewinder is a proven 5.7 cam, not many better.

Eric

[turbohips]

Come one Eric you're telling me that regardless of the DA my 60 foot times wouldn't be different? My car and the track prep doesn't really mean much to AWD guys. If your reasoning is correct that wouldn't explain how my 60 foot times got better when the air was cooler on the same track and with a lower DA later in the evening. DA absolutely has something to do with 60' times. My cam is larger than the Sidewinder so I should have more torque.

[EricG]

Originally Posted by turbohips

Come one Eric you're telling me that regardless of the DA my 60 foot times wouldn't be different? My car and the track prep doesn't really mean much to AWD guys. If your reasoning is correct that wouldn't explain how my 60 foot times got better when the air was cooler on the same track and with a lower DA later in the evening. DA absolutely has something to do with 60' times. My cam is larger than the Sidewinder so I should have more torque.

I dunno...maybe it's different for AWD, but I stand by my statement - for my car anyway.

Eric

[yamabob]

Steve, what would be a good stall speed for the torque convetor

[lethal300c]

Originally Posted by turbohips

Come one Eric you're telling me that regardless of the DA my 60 foot times wouldn't be different? My car and the track prep doesn't really mean much to AWD guys. If your reasoning is correct that wouldn't explain how my 60 foot times got better when the air was cooler on the same track and with a lower DA later in the evening. DA absolutely has something to do with 60' times. My cam is larger than the Sidewinder so I should have more torque.

I'd have to say Eric is right, to a point. DA in itself should not have a huge impact on 60' times, depending on the largest part factored into the DA. The heat soak that occurs, and is largely part of the DA at lower altitude tracks, is the problem. Since you are running in the area of Fontana, heat is the single biggest challenge you have, and the largest contributer to a high DA. Damn near impossible to get your engine cooled enough for decent runs in extreme heat or humidity. Getting it cooled just in high altitude is a different story.

Going with that, the DA (heat/humidity) killed me my last time out. My best 60' is 1.81 this last spring with a DA of around -300 or so. About a month ago (with 75-80 more whp thanks to heads/cam) my best was 1.97 in a DA of +3300 and worse. Now on that outing track prep sucked and I still do not believe I could have matched my previous best, even if track prep was damn near perfect.

You will get better 60' times turbo, once it cools off a bit. That is my story, and I am sticking with it.

Edit: Sorry bob, did not mean to hijack your thread.

[stevesrt8]

Originally Posted by yamabob

Steve, what would be a good stall speed for the torque convetor

Ideally you would look to the cam spec to decide, but in these cars you can go WAY higher than I normally would due to the trans design.

3000 rpm looks like the norm to me.

[yamabob]

Thanks Steve. At least this will be a relatively cheap mod

Keith-no need to apologize. I find your postings entertaining and somewhat pertinent to a cam job. It's all good! Now Steve has helped me with my personal stimulus package. Keep up the good work guys!!! Only problem is I only get to enjoy the car 1 to 2 days a week max at this point. I'll be back to her tonight though and plan on "breaking" in the cam job as best as I can. I'll let ya know if I feel any difference.

[EricG]

Originally Posted by lethal300c

I'd have to say Eric is right, to a point. DA in itself should not have a huge impact on 60' times, depending on the largest part factored into the DA. The heat soak that occurs, and is largely part of the DA at lower altitude tracks, is the problem. Since you are running in the area of Fontana, heat is the single biggest challenge you have, and the largest contributer to a high DA. Damn near impossible to get your engine cooled enough for decent runs in extreme heat or humidity. Getting it cooled just in high altitude is a different story.

Going with that, the DA (heat/humidity) killed me my last time out. My best 60' is 1.81 this last spring with a DA of around -300 or so. About a month ago (with 75-80 more whp thanks to heads/cam) my best was 1.97 in a DA of +3300 and worse. Now on that outing track prep sucked and I still do not believe I could have matched my previous best, even if track prep was damn near perfect.

You will get better 60' times turbo, once it cools off a bit. That is my story, and I am sticking with it.

Edit: Sorry bob, did not mean to hijack your thread.

Thanks Keith, and I should have elaborated a little more maybe. Track prep you cannot control really, but car prep is important. Same tires, same PSI, same weight, and controlling your car's temps etc are crucial...and when you want to compare before and after or try to measure the weather's effects you need to control all these other things. That's all I meant, and when you do all that I bet you would find that your 60 foots would not change that much day to day regardless of the weather if the car's modifications are held constant.

Eric