60 ft question A4 vs. A3
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Heres my question... Last year, my car would 60' 1.68- 1.69 all day long with the 4l60E,9.5 inch 2800 vig, and bfg dr's.
This year new set up, 350 turbo forward valvle body, 9.5 inch 3400 edge, and 26 10.50 16 et streets. The best sixty I have cut is a 1.752.
Did swapping trannys make me loose my 60'? What can I do to get it back? Give me some tips. I'm running the same mph, maybe a -.5 mph due to et streets, What gives????
This year new set up, 350 turbo forward valvle body, 9.5 inch 3400 edge, and 26 10.50 16 et streets. The best sixty I have cut is a 1.752.
Did swapping trannys make me loose my 60'? What can I do to get it back? Give me some tips. I'm running the same mph, maybe a -.5 mph due to et streets, What gives????
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Originally Posted by matt94z
Heres my question... Last year, my car would 60' 1.68- 1.69 all day long with the 4l60E,9.5 inch 2800 vig, and bfg dr's.
This year new set up, 350 turbo forward valvle body, 9.5 inch 3400 edge, and 26 10.50 16 et streets. The best sixty I have cut is a 1.752.
Did swapping trannys make me loose my 60'? What can I do to get it back? Give me some tips. I'm running the same mph, maybe a -.5 mph due to et streets, What gives????
This year new set up, 350 turbo forward valvle body, 9.5 inch 3400 edge, and 26 10.50 16 et streets. The best sixty I have cut is a 1.752.
Did swapping trannys make me loose my 60'? What can I do to get it back? Give me some tips. I'm running the same mph, maybe a -.5 mph due to et streets, What gives????
But I can tell you that I went from a 4L60E/4400 TCI combo with a 4.30 gear and 26' ET Drag's at 3480 lbs the car ran a best of a 11.07 @ 120 with a 1.51 60' in really good air..
I recently swapped in a 2.48 geared Turbo 400 with a brake and with 28' ET Drags with the same 4.30 gears the car last week went a 11.43 @ 118 with a 1.61 60' in really bad air....
But weather conditions , track conditions can cause all kinds of reasons your car slowed down..
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I did not loose any 60' from the swap in my LT1 car but can see how one could with alot of changes, my biggest dislike was the loss of the 1st gear ratio. THe A4 felt alot stronger off the line but according to the slips not much was lost, if any it actually picked up some with the TH350 but I figured that was just due to weight.
I changed alot of stuff when I did the swap but no changes to the suspension or tires, it was exhaust changes mainly and some head work...but dyno showed no increase in power.....with all the changes....talk about sucking!
I changed alot of stuff when I did the swap but no changes to the suspension or tires, it was exhaust changes mainly and some head work...but dyno showed no increase in power.....with all the changes....talk about sucking!
#5
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Last year I ran 25.7 tall bfg's, this year 26.1 et streets. I have a Moser 12bolt with 3.73's. I have a BMR adj ta set at -2.5, bmr lca, adj. phr, and bmr subframes (boxed style). This year I also removed my front sway bar. I have had the car out three times. The first time was on street tires, and ran a best of 12.47 with a 1.811 60' @108.96 on Kuhmos 275/40/17's. I thought I would kill my previous best when I got my new slicks. What diffrent adjustments can I make?? Help me out..
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Well, what did you 60' with your slicks?!? You never said. All you gave us was your Kuhmo times.
As for the topic, I will let ya'll know soon how my swap affects my short times.
Old set up: C1 cam, 4L60E, YPT4400 and 26" Hoosier QTP's
New set up: G5X4 cam, TH350 w/ 2.75 first gear, 8" 5000 RPM converter and 27" Hoosier QTP's.
It is probably only fair to compare foot brake launches. I didn't have a t-brake on the 4L60E of course. I'll post up in a week or so!
As for the topic, I will let ya'll know soon how my swap affects my short times.
Old set up: C1 cam, 4L60E, YPT4400 and 26" Hoosier QTP's
New set up: G5X4 cam, TH350 w/ 2.75 first gear, 8" 5000 RPM converter and 27" Hoosier QTP's.
It is probably only fair to compare foot brake launches. I didn't have a t-brake on the 4L60E of course. I'll post up in a week or so!
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The 3.06 low gear in the A4 should theoretically 60 ft better than the 350.
Originally Posted by matt94z
Heres my question... Last year, my car would 60' 1.68- 1.69 all day long with the 4l60E,9.5 inch 2800 vig, and bfg dr's.
This year new set up, 350 turbo forward valvle body, 9.5 inch 3400 edge, and 26 10.50 16 et streets. The best sixty I have cut is a 1.752.
Did swapping trannys make me loose my 60'? What can I do to get it back? Give me some tips. I'm running the same mph, maybe a -.5 mph due to et streets, What gives????
This year new set up, 350 turbo forward valvle body, 9.5 inch 3400 edge, and 26 10.50 16 et streets. The best sixty I have cut is a 1.752.
Did swapping trannys make me loose my 60'? What can I do to get it back? Give me some tips. I'm running the same mph, maybe a -.5 mph due to et streets, What gives????
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Originally Posted by matt94z
My best 60' since the swap is a 1.752. Where can you get lower first gear sets for the tranny? I didn't know you could get a lower ratio when I bought mine. Help me out I wanna go 11's this year.
Lower gear sets are expensive unless you buy them used.
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Originally Posted by matt94z
Thanks for the info. How much would a 2.75 1st gear help me out? Would it get me back in the 1.6's?
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OK, I got some results.
OLD SETUP: C1 cam, YTP4400 converter, 4L60E, 4.10 gears
NEW SETUP: G5X4 cam, ATI 8" 4900 converter, TH350 w/ 2.75 1st, 4.10 gears
OLD 60's: 1.51
NEW 60's: 1.58
However, the DA was 2000' last night when I cut a 1.58. In 2000' DA on my old set up my 60's were around 1.54 or 1.55. SO I guess I lost about 0.03 to 0.04. But my wheelie days are now gone.
This ATI converter hits like a ![Supergay](https://ls1tech.com/forums/images/smilies2/supergay.gif)
I should have saved my money and kept the 4L60E and YTP4400 and got the G5X4 and some AFR 205's in addition.
OLD SETUP: C1 cam, YTP4400 converter, 4L60E, 4.10 gears
NEW SETUP: G5X4 cam, ATI 8" 4900 converter, TH350 w/ 2.75 1st, 4.10 gears
OLD 60's: 1.51
NEW 60's: 1.58
![Cry](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_cry.gif)
However, the DA was 2000' last night when I cut a 1.58. In 2000' DA on my old set up my 60's were around 1.54 or 1.55. SO I guess I lost about 0.03 to 0.04. But my wheelie days are now gone.
![Cry](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_cry.gif)
![Supergay](https://ls1tech.com/forums/images/smilies2/supergay.gif)
I should have saved my money and kept the 4L60E and YTP4400 and got the G5X4 and some AFR 205's in addition.
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What did you expect? you went from a 4L60E with a 3.06 first gear to a TH350 with a 2.55 first gear. You have a trans brake..leave off it next time
Try going with a TH400 with a 2.48 first gear
Try going with a TH400 with a 2.48 first gear
#17
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No, I'm supposed to have a 2.75 1st gear. At least that's what I paid for. I'm not convinced that's what I have though.
I figured going from a 3.06 to a 2.75 wouldn't effect my sixty foot times because I was also going from a 4400 converter to a 4900 converter and in addition I was adding a bigger cam. I figured the bigger cam and converter would offset the higher 1st gear ratio.
It's all good though. I can live with it.
I figured going from a 3.06 to a 2.75 wouldn't effect my sixty foot times because I was also going from a 4400 converter to a 4900 converter and in addition I was adding a bigger cam. I figured the bigger cam and converter would offset the higher 1st gear ratio.
It's all good though. I can live with it.
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Originally Posted by Shon Herron
just have to work with the new set up. Might take a different launch technique.
#20
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I heard most anyone would pick up in the 1/4 from the turbo 350 swap from a 4l60E for four reasons.
1) It takes less horsepower to turn it.
2) The car will weigh less. (trans is lighter)
3) The gear spacing is superior. (engine does not pull down into 2nd)
4) If you are making any real power the 3.06 first gear is too short.
Is this true or no?
1) It takes less horsepower to turn it.
2) The car will weigh less. (trans is lighter)
3) The gear spacing is superior. (engine does not pull down into 2nd)
4) If you are making any real power the 3.06 first gear is too short.
Is this true or no?