Educated opinions, please? (bolt-on gains)
Educated opinions, please? (bolt-on gains)
Can anyone tell me what approximate gains in 0-60 time (auto trans) I should be seeing over stock with the following mods:
-Crawford plenum
-K&N drop-in
-7 wire ground kit
-UR crank pulley
-2 degree timing advance
I'm only seeing about a .2 sec advantage (0-60 and 1/4 mile) vs. otherwise stock cars and wondering if something isn't jiving?
-Crawford plenum
-K&N drop-in
-7 wire ground kit
-UR crank pulley
-2 degree timing advance
I'm only seeing about a .2 sec advantage (0-60 and 1/4 mile) vs. otherwise stock cars and wondering if something isn't jiving?
Yeah, that sounds about right. The plenum doesn't help much until near redline, the ground wire are zero, the pulley gets maybe 5 ponies, air filter zero, and maybe 5 hp with advanced timing. Your not going to get a lot of umph from those mods in the 0-60 range. You probably gained some on your trap speed in the 1/4, but our car and the G has problems delivering factory power to the ground. So adding a little horse won't help much.
Last edited by zillinois; Nov 6, 2004 at 05:23 PM.
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From: Columbus, Ohio
I don't think that you are going to get any reliable numbers this way--way too many variables. The only way to know for sure is to do back to back dyno runs, or have a consistent time for your car at a track and look for the changes. Imo, the dyno is by far the more accurate of the two.
I get the same .2 sec avg advantage in 1/4 mile over stock. A few of us went to the TX Motor Speedway drag strip last night and made several runs. What was frustrating to me is that a guy with a completely stock car (also AT) beat me by a good .3 sec by simply icing down his plenum good before running.
Ok, some added info. to accompany the above post. I have raced the same guy on the street before (staged 1/4 mile runs) when he was running just as hot as me. He is completely stock. I took him slightly off the line, but under load toward the end of the 1/4, he was pulling on me (I still came out slightly ahead; I'd estimate by the same .2 sec I had over the other stock car at the track). I would think this should not happen with the plenum in place. I've been kicking it around and am thinking that perhaps at higher rpms under load, the ECU is pulling timing on me. No way to check it except to have my tech ride with me with the ConsultII hooked up (which I may try to do in the near future as time allows for both of us). The possible culprits are:
-The 2 degree timing advance in conjunction with the other mods is causing knock and pulling timing under load at higher speed/rpm (I strickly run Chevron 93 octane, BTW).
OR
-The undampened UR pulley is creating imbalance at high rpms under load which is registered as knock and resulting in pulled timing.
0-60 runs after each of these mods registered no adverse effects and I picked up .15 sec after the timing advance, but it would appear that there may be trouble at higher speed/rpm/load than 0-60 tests would indicate. On the other hand, there may be nothing at all wrong and this guy's engine just reponded REALLY well to icing down the plenum. He had .5 sec in the 1/4 over identical stock car there. That seems pretty huge. Lauch/shift techniques were the same.
Here are our time slips from the track (before you freak out at the times, I guess I should mention that these are FX35s (I traded my coupe on it about a year ago), but everything still relates exactly the same as if I had an auto Z or Gas we are running the same engine/drivetrain/exhaust/state of tune). Temp was 60 deg. Elevation was sea level, winds calm and all of our vehicle weights were within 40lbs. We all have the stock 20" rims, though mine are chromed, which may add a bit of ratating mass.:
Any ideas/theories? I'd appreciate any input.
-The 2 degree timing advance in conjunction with the other mods is causing knock and pulling timing under load at higher speed/rpm (I strickly run Chevron 93 octane, BTW).
OR
-The undampened UR pulley is creating imbalance at high rpms under load which is registered as knock and resulting in pulled timing.
0-60 runs after each of these mods registered no adverse effects and I picked up .15 sec after the timing advance, but it would appear that there may be trouble at higher speed/rpm/load than 0-60 tests would indicate. On the other hand, there may be nothing at all wrong and this guy's engine just reponded REALLY well to icing down the plenum. He had .5 sec in the 1/4 over identical stock car there. That seems pretty huge. Lauch/shift techniques were the same.
Here are our time slips from the track (before you freak out at the times, I guess I should mention that these are FX35s (I traded my coupe on it about a year ago), but everything still relates exactly the same as if I had an auto Z or Gas we are running the same engine/drivetrain/exhaust/state of tune). Temp was 60 deg. Elevation was sea level, winds calm and all of our vehicle weights were within 40lbs. We all have the stock 20" rims, though mine are chromed, which may add a bit of ratating mass.:
Code:
stock vehicle running warm
------------------------------------------------------------------------------------
run1 run2 run3
R/T .925 .653 .086
60' 2.374 2.360 2.407
330' 6.664 6.610 6.661
1/8 10.146 10.046 10.101
MPH 71.31 72.44 72.37
1000' 13.166 13.019 13.077
1/4 15.736 15.555 15.616
MPH 87.52 88.66 88.51
avg 1/4: 15.636 @ 88.23mph
Code:
MustGoFastR (me)
------------------------------------------------------------------------------------
run1 run2 run3
R/T .640 .299 .486
60' 2.294 2.395 2.321
330' 6.512 6.625 6.545
1/8 9.913 10.035 9.943
MPH 72.94 73.14 73.32
1000' 12.878 12.975 12.877
1/4 15.397 15.479 15.376
MPH 89.40 89.76 89.91
avg 1/4: 15.417 @ 89.69mph
Code:
Mr. Iced plenum:
------------------------------------------------------------------------------------
run1 run2 run3 run4
R/T .502 .391 .452 .631
60' 2.272 2.284 2.243 2.273
330' 6.412 6.538 6.370 6.455
1/8 9.778 10.008 9.717 9.840
MPH 73.52 72.47 74.29 73.58
1000' 12.714 12.959 12.611 12.761
1/4 15.206 15.458 15.073 15.245
MPH 90.40 90.20 91.42 90.54
avg 1/4: 15.245 @ 90.64
I am assuming that you have an automatic tranny correct? I know of a couple people now who have found that their ECU is pulling a lot of timing out as the rpms go up on their modded AT vehicles. I would very much guess this could be the culprit. The 2 degree advance might be causing a negative reaction?
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Originally posted by zzzya
I am assuming that you have an automatic tranny correct? I know of a couple people now who have found that their ECU is pulling a lot of timing out as the rpms go up on their modded AT vehicles. I would very much guess this could be the culprit. The 2 degree advance might be causing a negative reaction?
I am assuming that you have an automatic tranny correct? I know of a couple people now who have found that their ECU is pulling a lot of timing out as the rpms go up on their modded AT vehicles. I would very much guess this could be the culprit. The 2 degree advance might be causing a negative reaction?
I'd chalk it up to production variances. Some engines are just stronger than others straight from the factory. I've heard that there could be +- 2 ponies per cylinder due to this variance.
Originally posted by al503
I'd chalk it up to production variances. Some engines are just stronger than others straight from the factory. I've heard that there could be +- 2 ponies per cylinder due to this variance.
I'd chalk it up to production variances. Some engines are just stronger than others straight from the factory. I've heard that there could be +- 2 ponies per cylinder due to this variance.
Hmm, one other thing: how much does tire pressure effect you in the 1/4? That's the only thing I didn't check between us and mine was a bit lower than I would have liked for the event (32psi).
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