Improved ET
Thread Starter
Melting Slicks
Joined: Jun 2012
Posts: 3,163
Likes: 6
From: Oceanside California
Improved ET
Hey everyone, I hit the crappy 1/8th mile unimproved strip we have here in San Diego last night again. (Bolt on's 99 coupe).
Long story short I went from consistent 8.7 times last race (8.757 being my best), to consistent 8.4 times this time (8.412 my best). Upgrades since last time are a FAST 92mm intake, LS2 TB, and 85mm MAF (I had the 75mm MAF stock).
I found it funny that I was still getting literally the same MPH (87mph), as last time to this time. Don't get me wrong, I am happy with reaching lowish 8 second times, but my tuner suggested that Id likely see 3 tenths better and two mph faster. He was right on the money with the ET. Why didn't my trap speed improve?
Gotta give props to Excelsior Motorsports for the great tune and time put into it. Kushan is a great guy and very knowledgeable and experienced.
Long story short I went from consistent 8.7 times last race (8.757 being my best), to consistent 8.4 times this time (8.412 my best). Upgrades since last time are a FAST 92mm intake, LS2 TB, and 85mm MAF (I had the 75mm MAF stock).
I found it funny that I was still getting literally the same MPH (87mph), as last time to this time. Don't get me wrong, I am happy with reaching lowish 8 second times, but my tuner suggested that Id likely see 3 tenths better and two mph faster. He was right on the money with the ET. Why didn't my trap speed improve?
Gotta give props to Excelsior Motorsports for the great tune and time put into it. Kushan is a great guy and very knowledgeable and experienced.
Pro
Joined: Aug 2012
Posts: 568
Likes: 1
From: Fresno California
What happened to your 60' time? I know they go hand in hand but often times it is easier to lower the e.t. than increase top speed. There are so many factors involved that it can be difficult to answer the m.p.h. question. Generally though, an increase in h.p. or a reduction in weight usually means higher top speed in a given distance.
Safety Car
Joined: Aug 2011
Posts: 4,436
Likes: 403
From: Portland OR
If the 60ft improved, then it likely didn't have much to do with the manifold TB MAF change.
Unless the new setup makes less low end torque thus eliminating tire spin......
Just saying.
MPH comes from HP.
You mentioned a tune....on the dyno? Any diff in HP there? Or was it tuned on the street?
Unless the new setup makes less low end torque thus eliminating tire spin......
Just saying.
MPH comes from HP.
You mentioned a tune....on the dyno? Any diff in HP there? Or was it tuned on the street?
Thread Starter
Melting Slicks
Joined: Jun 2012
Posts: 3,163
Likes: 6
From: Oceanside California
If the 60ft improved, then it likely didn't have much to do with the manifold TB MAF change.
Unless the new setup makes less low end torque thus eliminating tire spin......
Just saying.
MPH comes from HP.
You mentioned a tune....on the dyno? Any diff in HP there? Or was it tuned on the street?
Unless the new setup makes less low end torque thus eliminating tire spin......
Just saying.
MPH comes from HP.
You mentioned a tune....on the dyno? Any diff in HP there? Or was it tuned on the street?
Safety Car
Joined: Aug 2011
Posts: 4,436
Likes: 403
From: Portland OR
Thanks.
if the air density were worse the second time you raced, the no change in mph is explainable. 15 horse is probably about 1-2 mph. Torque curve look better in the midrange?
You will put all those new parts to much better use when you do the heads and camand headers etc.
if the air density were worse the second time you raced, the no change in mph is explainable. 15 horse is probably about 1-2 mph. Torque curve look better in the midrange?
You will put all those new parts to much better use when you do the heads and camand headers etc.
Thread Starter
Melting Slicks
Joined: Jun 2012
Posts: 3,163
Likes: 6
From: Oceanside California
Thanks.
if the air density were worse the second time you raced, the no change in mph is explainable. 15 horse is probably about 1-2 mph. Torque curve look better in the midrange?
You will put all those new parts to much better use when you do the heads and camand headers etc.
if the air density were worse the second time you raced, the no change in mph is explainable. 15 horse is probably about 1-2 mph. Torque curve look better in the midrange?
You will put all those new parts to much better use when you do the heads and camand headers etc.
Le Mans Master
Joined: Aug 2005
Posts: 5,375
Likes: 326
From: CA.
St. Jude Donor '13-'14-'15
[QUOTE=RonSSNova;1582364255]If the 60ft improved, then it likely didn't have much to do with the manifold TB MAF change.
Unless the new setup makes less low end torque thus eliminating tire spin......
Just saying.
MPH comes from HP.
Completely !! Your ET dropped beacsue you made LESS TQ and LESS HP and the car hooked up better--Time slips don't lie--
also--1/8 mile runs aren't a great way to check for HP gains from mods--
In order to compare mods you really need to get the trans 1:1 (or
3rd gear on an A4 ) to get accurate results without a dyno-
AND a 92/LS2/85mm mod is really a top end charge deal--In 1st and 2d gear beacuse of the underdriven trans there is just not enough load on the engine to make them work---Best results for TQ and HP for 1st and 2nd gear runs would be to DOWNSIZE the air system to increase TB velocity and not flow---Velocity produces TQ--and TQ is what gets you off the line---
Unless the new setup makes less low end torque thus eliminating tire spin......
Just saying.
MPH comes from HP.
Completely !! Your ET dropped beacsue you made LESS TQ and LESS HP and the car hooked up better--Time slips don't lie-- also--1/8 mile runs aren't a great way to check for HP gains from mods--
In order to compare mods you really need to get the trans 1:1 (or
3rd gear on an A4 ) to get accurate results without a dyno-
AND a 92/LS2/85mm mod is really a top end charge deal--In 1st and 2d gear beacuse of the underdriven trans there is just not enough load on the engine to make them work---Best results for TQ and HP for 1st and 2nd gear runs would be to DOWNSIZE the air system to increase TB velocity and not flow---Velocity produces TQ--and TQ is what gets you off the line---
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Thread Starter
Melting Slicks
Joined: Jun 2012
Posts: 3,163
Likes: 6
From: Oceanside California
[QUOTE=tblu92;1582369445]
I understand velocity. I preach it all the time to these guys and their over sized headers, over ported heads, etc, etc. I dont know how you can come to that conclusion though..
The car was dyno tuned and made a 15whp and 13wtq. increase. No it does not have a great effect on the low end, but the torque curve increased throughout the entire RPM band. So there was no loss power-wise.
If the 60ft improved, then it likely didn't have much to do with the manifold TB MAF change.
Unless the new setup makes less low end torque thus eliminating tire spin......
Just saying.
MPH comes from HP.
Completely !! Your ET dropped beacsue you made LESS TQ and LESS HP and the car hooked up better--Time slips don't lie--
also--1/8 mile runs aren't a great way to check for HP gains from mods--
In order to compare mods you really need to get the trans 1:1 (or
3rd gear on an A4 ) to get accurate results without a dyno-
AND a 92/LS2/85mm mod is really a top end charge deal--In 1st and 2d gear beacuse of the underdriven trans there is just not enough load on the engine to make them work---Best results for TQ and HP for 1st and 2nd gear runs would be to DOWNSIZE the air system to increase TB velocity and not flow---Velocity produces TQ--and TQ is what gets you off the line---
Unless the new setup makes less low end torque thus eliminating tire spin......
Just saying.
MPH comes from HP.
Completely !! Your ET dropped beacsue you made LESS TQ and LESS HP and the car hooked up better--Time slips don't lie-- also--1/8 mile runs aren't a great way to check for HP gains from mods--
In order to compare mods you really need to get the trans 1:1 (or
3rd gear on an A4 ) to get accurate results without a dyno-
AND a 92/LS2/85mm mod is really a top end charge deal--In 1st and 2d gear beacuse of the underdriven trans there is just not enough load on the engine to make them work---Best results for TQ and HP for 1st and 2nd gear runs would be to DOWNSIZE the air system to increase TB velocity and not flow---Velocity produces TQ--and TQ is what gets you off the line---
The car was dyno tuned and made a 15whp and 13wtq. increase. No it does not have a great effect on the low end, but the torque curve increased throughout the entire RPM band. So there was no loss power-wise.
Le Mans Master
Joined: Aug 2005
Posts: 5,375
Likes: 326
From: CA.
St. Jude Donor '13-'14-'15
It really depends on each individual combination--IF you have a stall converter then you would pass right by the lower RPM bog--If you launch a 6 speed from 3000-4000 then that would again pass right by the bottom bog----BUT if you have a stock converter (1400 RPM) or launch a 6 speed below 3000 you launch right where the smaller diameter airflow would help in making it leave harder-----It's sorta like putting too large of a carburater on a car---The larger carb may make more HP at high RPM's but the smaller carb with more velocity would make more TQ and it will leave harder --it's a trade off and depends what you believe will make the car QUICKER in the 1/4---not faster at big end--