4.10 A4 track results
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From: Simi Valley, CA
4.10 A4 track results I headed out to Carlsbad today to test out my new 4.10 gears. The only change over last week is I swapped my 3.23 gears out for the 4.10s, and had the computer adjusted for the new gears.
Best ET with the 3.23s: 11.64@116 1.72 60' time
Best ET with the 4.10s: 11.63@118 1.60 60' time
I'm a little baffled, as I picked up .12th in the 60' time (should be around .2ths in the 1/4), but it didn't materialize. My only thought is my shift points might be too low now. Things go by fast with the 4.10s and I didn't get a really good look at them.
To add insult to injury my 4.10s are now whining like crazy (they were quiet on the way to the track). I'll give the gear shop a ring on Monday and see what they can do for me. I might have to cut my loses and pay them to reinstall the 3.23s. It's too bad, I really like the way the 4.10s drive on the street. At the track I also tried a lockup switch, which was worth another .5 mph and no ET. The ST3800 converter appears to be pretty efficient, only a 10rwhp peak difference between locked and unlocked.
Best ET with the 3.23s: 11.64@116 1.72 60' time
Best ET with the 4.10s: 11.63@118 1.60 60' time
I'm a little baffled, as I picked up .12th in the 60' time (should be around .2ths in the 1/4), but it didn't materialize. My only thought is my shift points might be too low now. Things go by fast with the 4.10s and I didn't get a really good look at them.
To add insult to injury my 4.10s are now whining like crazy (they were quiet on the way to the track). I'll give the gear shop a ring on Monday and see what they can do for me. I might have to cut my loses and pay them to reinstall the 3.23s. It's too bad, I really like the way the 4.10s drive on the street. At the track I also tried a lockup switch, which was worth another .5 mph and no ET. The ST3800 converter appears to be pretty efficient, only a 10rwhp peak difference between locked and unlocked.
Teching In
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From: Corona, CA USA
Re: 4.10 A4 track results Terry sorry about not getting better results <img src="gr_sad.gif" border="0">
But, can you tell me the name of the clutch again that you suggested for the ratmobile?
At this point Money is not a oject. I'm tired of not being able to shift <img src="gr_sad.gif" border="0"> Dang clutch
Or anyone else
TIA
But, can you tell me the name of the clutch again that you suggested for the ratmobile?
At this point Money is not a oject. I'm tired of not being able to shift <img src="gr_sad.gif" border="0"> Dang clutch
Or anyone else
TIA
Re: 4.10 A4 track results The results are pretty odd. The MPH looks good, but it doesn't add up. Where were your shift points set, and what were you crossing at?
Just curious why you went to 4.10's since this setup was supposed to be a "street" setup.
Just curious why you went to 4.10's since this setup was supposed to be a "street" setup.
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Re: 4.10 A4 track results You definately need to Atap the shift points, Terry. Cause like you said, your significant improvement in 60' should have translated to more at the end than it did. Is your car programmed to shift by mph or rpm? If it's mph, like mine, you'd be shifting higher with the 4.10's. In fact, I'm surprised you didn't hit the rev limiter.
Don't give up on the gears, yet. The 4.10 really wakes these A4's up on the street. And I think they make a streetable package, unless you're into long high speed cruises. Mine tachs at around 3000 at 80 mph.
Don't give up on the gears, yet. The 4.10 really wakes these A4's up on the street. And I think they make a streetable package, unless you're into long high speed cruises. Mine tachs at around 3000 at 80 mph.
Re: 4.10 A4 track results Terry get it back on the dyno just to fine tune her alittle bit better.Set your shift points accordingly.
U picked up considerable et/mph in thr 1/8th.Now u need to do is get the setup working properly and u should net 2.5 tenths up top...
Dont give up on the 4.10 yet.
11.40's r just around the corner Terry
Good Luck...
JS
U picked up considerable et/mph in thr 1/8th.Now u need to do is get the setup working properly and u should net 2.5 tenths up top...
Dont give up on the 4.10 yet.
11.40's r just around the corner Terry
Good Luck...
JS
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Re: 4.10 A4 track results Terry,
Those gains are pretty consistent with what we've seen around here too. The guys are right, do some super tuning and give it one more shot. If you don't find another tenth in that, then you'll probably be just as happy with the 3.23s. Nice ET and mph by the way. <img src="graemlins/gr_cheers.gif" border="0" alt="[cheers]" />
Those gains are pretty consistent with what we've seen around here too. The guys are right, do some super tuning and give it one more shot. If you don't find another tenth in that, then you'll probably be just as happy with the 3.23s. Nice ET and mph by the way. <img src="graemlins/gr_cheers.gif" border="0" alt="[cheers]" />
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
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2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
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On The Tree
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From: Hainesport N.J.
Re: 4.10 A4 track results Hi Terry,
80% of your torque multiplication is comming from your converter so the gears will be less effective. Good luck though hope to see you put up some real good times soon.
80% of your torque multiplication is comming from your converter so the gears will be less effective. Good luck though hope to see you put up some real good times soon.
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From: Corona CA
Re: 4.10 A4 track results It doesn't make sense that you'd run a better 60, a faster MPH, and the same ET, IMO. How did your 1/8mi numbers compare?
Terry, I'd try Fontana before making any major changes.
Several people had strange slips there yesterday. They may have been have trouble with the timing Equipment, (or not).
Example: I got a slip that said 99mph at the 1/8, and 111 at the quarter, and the distance (660ft) was covered in 4.5 seconds. That's an average speed of 100mph. The average speed should have been ~105mph. Doesn't sound like much, except 5mph is ALOT.
I saw a couple of other people's slips that looked fishy as well.
Terry, I'd try Fontana before making any major changes.
Several people had strange slips there yesterday. They may have been have trouble with the timing Equipment, (or not).
Example: I got a slip that said 99mph at the 1/8, and 111 at the quarter, and the distance (660ft) was covered in 4.5 seconds. That's an average speed of 100mph. The average speed should have been ~105mph. Doesn't sound like much, except 5mph is ALOT.
I saw a couple of other people's slips that looked fishy as well.
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Re: 4.10 A4 track results [quote]
So did you only pick up 1.5 mph with the gears, and another .5 mph by locking it up, or was that 2mph gain an apples to apples comparison?
<hr></blockquote>
I picked up 2mph with the gears, and another .5 mph by locking the converter up.
Regarding the numbers, I agree they are very strange. I was hoping for a 1.5th reduction in ET so I was a little ticked off. The shift points must be too low. I am loosing 2 MPH in the 1/8 and picking up 2mph in the 1/4 over my previous 3.23 times.
The 4.10s are a really fun street gear, the car is fast all the time now, and the RPMS on the freeway are not that bad. My car is really quiet, so that helps with the freeway driving. Maybe I'll look in to getting a 4.10 12 bolt. The car felt a lot better at the track with the 4.10s over the 3.23s, and launched much more consistently.
So did you only pick up 1.5 mph with the gears, and another .5 mph by locking it up, or was that 2mph gain an apples to apples comparison?
<hr></blockquote>
I picked up 2mph with the gears, and another .5 mph by locking the converter up.
Regarding the numbers, I agree they are very strange. I was hoping for a 1.5th reduction in ET so I was a little ticked off. The shift points must be too low. I am loosing 2 MPH in the 1/8 and picking up 2mph in the 1/4 over my previous 3.23 times.
The 4.10s are a really fun street gear, the car is fast all the time now, and the RPMS on the freeway are not that bad. My car is really quiet, so that helps with the freeway driving. Maybe I'll look in to getting a 4.10 12 bolt. The car felt a lot better at the track with the 4.10s over the 3.23s, and launched much more consistently.
Teching In
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From: California
Re: 4.10 A4 track results [quote]Originally posted by Terry Burger:
<strong>To add insult to injury my 4.10s are now whining like crazy (they were quiet on the way to the track). </strong><hr></blockquote>
Is it possible that they didn't get set right? Or broke in long enough before launching hard on them? I ask because I'm considering the same swap.
<strong>To add insult to injury my 4.10s are now whining like crazy (they were quiet on the way to the track). </strong><hr></blockquote>
Is it possible that they didn't get set right? Or broke in long enough before launching hard on them? I ask because I'm considering the same swap.
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Re: 4.10 A4 track results I dropped the car off at the gear shop today, and they tell me that the majority of the whining problem is being caused by the pinion bearing in the rear end. It looks like the 4.10s will get another chance at the track. <img src="gr_images/icons/wink.gif" border="0">
The motor makes good power up to about 6800rpm, so I'm going to set my shift points at 6800 and give her another shot.
The motor makes good power up to about 6800rpm, so I'm going to set my shift points at 6800 and give her another shot.
Teching In
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From: Bremerton, WA
Re: 4.10 A4 track results Terry,
What tires are you running? Do you know what RPM you cross the traps at? I changed from 3.42's to 3.90 and noticed my 1/8 mph drop about 2 also...
But my top end mph went up by three. and I dropped about a tenth off my ET.
Ryan
What tires are you running? Do you know what RPM you cross the traps at? I changed from 3.42's to 3.90 and noticed my 1/8 mph drop about 2 also...
But my top end mph went up by three. and I dropped about a tenth off my ET.
Ryan
Re: 4.10 A4 track results Terry get ready for some good ETs
With your S2X setup u need to shift it around 6600 to 6800 to really benefit..
All u need is a good track prep and decent DA and I expect u to have a BIG smile on your face this weekend..
Good Luck
JS
With your S2X setup u need to shift it around 6600 to 6800 to really benefit..
All u need is a good track prep and decent DA and I expect u to have a BIG smile on your face this weekend..
Good Luck
JS
Re: 4.10 A4 track results did you ever analyze both slips side by side, looking at 330', 1/8, & 1000'? I'm curious where the ET was lost given the 60' was better and the mph was better.