Halltech CAI Installed
Safety Car
Joined: Jul 2019
Posts: 4,079
Likes: 2,413
From: Florida
If we wanted to be helpful id ask him to do datalogging during the runs and during testing. I always datalog any mod.
Datalog air intake volume per rpm in the same gear versus intake air temperature, ECT, and the ambient temperature sensor.
This along with trap speed data and 60-130 data will help you know if your mods made power.
Once you know your mods made power THEN start looking for a better e.t. with e t. you may find other things you then want to address like launch traction
Thread Starter
Drifting
Joined: Dec 2016
Posts: 1,702
Likes: 577
How would that help accurately comparing his baseline run versus his halltech run. We're trying to accurately compare data on his car not add someone else's in. That's confounding the data.
If we wanted to be helpful id ask him to do datalogging during the runs and during testing. I always datalog any mod.
Datalog air intake volume per rpm in the same gear versus intake air temperature, ECT, and the ambient temperature sensor.
This along with trap speed data and 60-130 data will help you know if your mods made power.
Once you know your mods made power THEN start looking for a better e.t. with e t. you may find other things you then want to address like launch traction
If we wanted to be helpful id ask him to do datalogging during the runs and during testing. I always datalog any mod.
Datalog air intake volume per rpm in the same gear versus intake air temperature, ECT, and the ambient temperature sensor.
This along with trap speed data and 60-130 data will help you know if your mods made power.
Once you know your mods made power THEN start looking for a better e.t. with e t. you may find other things you then want to address like launch traction
Safety Car
Joined: Jul 2019
Posts: 4,079
Likes: 2,413
From: Florida
Yes that's a 1.8x 60 foot because it's no prep traction. Again as you can see. Ignore that and e.t. focus on trap speed like it shows. Focus on 1/8 to 1/4 mph pickup if you are trying to assess power.
If you all are assessing TRACTION that's a different thing
Now put your car in 4th gear and grab the following data....
Here you can compare your air intake volume before and after any changes.
I'm sure you know your intake air volume will tell you about power.
All this can help you in your testing to get you ready for better times.
The e.t. will come. It's not what you care about in testing performance mods. You want data that will speak to power differences so you can know what mods are doing, what mods to choose and then you can go focus on e.t.
Le Mans Master
Joined: Oct 2005
Posts: 5,040
Likes: 879
From: Tampa Florida
Is this your car? Good information but I won't be using the draggy to record information just for simple bolt-ons. I am an old school guy. I just don't have time for gathering that type of data at the track. I would miss all of the fun with the guys. If I was still bracket racing maybe so. The data may be important to other members.
Race Director
Joined: Jan 2014
Posts: 10,709
Likes: 7,100
From: Fulshear, TX
Here's a post of mine from back in April 2022. The Halltech intake really only shows gains for about 750 RPM worth of powerband, and in that same 750 RPM range, is absolutely decimated by the Corsa intake. Plenty will disagree with me which is fine, but the Halltech design is basically nothing more than an enlarged stock design retaining the negative attributes of it, including reusing the restrictive/small factory inlets along with the forcing already turbulent air to make an immediate 90-degree bend as soon as it passes through the filter media.
Quick summary of peak numbers with gains, in order of appearance, so we have it documented:
Brand / WHP / WTQ (gains)
Brand / WHP / WTQ (gains)
- stock / 436 / 428
- K&N / 441 / 430 (+5/+2)
- aFe Pro5R / 441 / 429 (+5/+1)
- aFe ProDryS / 444 / 435 (+8/+7)
- Halltech / 443 / 428 (+7/+0)
- Corsa / 448 / 431 (+12/+3)
Last edited by Kracka; Jul 28, 2023 at 10:31 AM.
Le Mans Master
Joined: Oct 2005
Posts: 5,040
Likes: 879
From: Tampa Florida
Won't disagree at all. Halltech hits pretty hard at low end but kind of smooth out on top end similar to stock. AFE seems to pull very hard up top. I guess that's similar to the Corsa. One member trapped 125 with a simple bolt-on down here in Orlando with AFE. But for now I am satisfied with my Halltech. Thanks for the info.
Safety Car
Joined: Jul 2019
Posts: 4,079
Likes: 2,413
From: Florida
Is this your car? Good information but I won't be using the draggy to record information just for simple bolt-ons. I am an old school guy. I just don't have time for gathering that type of data at the track. I would miss all of the fun with the guys. If I was still bracket racing maybe so. The data may be important to other members.
It's helped me figure out a lot of very costly mistakes over the years of building cars haha
Thread Starter
Drifting
Joined: Dec 2016
Posts: 1,702
Likes: 577
So your C8 is stock? Have you done any track testing? The draggy is good to gauge performance but track vids have shown there is a difference between the actual track clock and the draggy. I actually go to the track to test out these mods that I install on my car.
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Thread Starter
Drifting
Joined: Dec 2016
Posts: 1,702
Likes: 577
I went with the Halltech because it's closely designed to the stock unit and makes a little more power over the drop-in filter and I paid 715 to my door. I truly believe all the CAIs make about the same power. Heck, the Eventuri supposed to make 18hp/17tq, but we have not heard/seen proof during actual track testing. I am open to track test one.
Le Mans Master
Joined: Oct 2005
Posts: 5,040
Likes: 879
From: Tampa Florida
I went with the Halltech because it's closely designed to the stock unit and makes a little more power over the drop-in filter and I paid 715 to my door. I truly believe all the CAIs make about the same power. Heck, the Eventuri supposed to make 18hp/17tq, but we have not heard/seen proof during actual track testing. I am open to track test one.
Instructor
Joined: Oct 2022
Posts: 170
Likes: 53
Stock run meaning your baseline run.
Again, ignore e.t. on your first run you were at a 1.73 60 foot.
On the halltek run you had a 1.67 60 foot.
Your e.t. improvement was all launch. The first 60 feet. Shifting, traction, launch is e.t. forget about that if you're trying to purely evaluate mods / power.
Like I said...trap speed and back half delta is power.
Your car without the halltek picked up 24.58 mph without the halltek in a worse DA.
Your car picked up 24.50mph in a better DA with the halltek.
If you're looking for objective power data that's it.
If you want a better e.t. throw on a drag slick and you'll run 3 tenths faster but you won't have made more power.
No Halltek
DA 2799
95.64 mph trap 1/8
120.22 trap speed 1/4
24.58 mph increase from 1/8 to 1/4
Halltek DA 2609
96.01 mph trap 1/8
120.51 mph trap speed 1/4
24.50 mph increase from 1/8 to 1/4
Again, ignore e.t. on your first run you were at a 1.73 60 foot.
On the halltek run you had a 1.67 60 foot.
Your e.t. improvement was all launch. The first 60 feet. Shifting, traction, launch is e.t. forget about that if you're trying to purely evaluate mods / power.
Like I said...trap speed and back half delta is power.
Your car without the halltek picked up 24.58 mph without the halltek in a worse DA.
Your car picked up 24.50mph in a better DA with the halltek.
If you're looking for objective power data that's it.
If you want a better e.t. throw on a drag slick and you'll run 3 tenths faster but you won't have made more power.
No Halltek
DA 2799
95.64 mph trap 1/8
120.22 trap speed 1/4
24.58 mph increase from 1/8 to 1/4
Halltek DA 2609
96.01 mph trap 1/8
120.51 mph trap speed 1/4
24.50 mph increase from 1/8 to 1/4
Safety Car
Joined: Jul 2019
Posts: 4,079
Likes: 2,413
From: Florida
Safety Car
Joined: Jul 2019
Posts: 4,079
Likes: 2,413
From: Florida
His car was quicker and faster and that's what matters to me. Without actual iat's during each run its hard to know what's actually going on. Car could have been more heat soaked with the Halltech, who knows. All I know is that with the simple mods I've done I've cut about 4 tenths off my times.
You could literally drop .4 seconds in e.t. by running on a prepped surface vs non prepped and zero horsepower changes took place. The trap speeds will barely budge though.
If you want to assess power changes you look at datalogs of engine power, air intake, timing etc and then you look at acceleration data such as trap speeds, increase in mph from 1/8 to 1/4 and 60-130 times.
Obviously if you had a better 60-130 time but a worse e.t. you wouldn't think the car made more power when it has the better e.t. than 60-130 time. That's because e.t. is confounded by way too many other independent variables.
I this only to be helpful to those that are interested in actually assessing their modification changes. For those that are just horsing around and having fun then none of this matters anyway.
Instructor
Joined: Oct 2022
Posts: 170
Likes: 53
That's not what matters if you are trying to assess power modifications. If you are just having fun that's cool but e.t. is not used for assessing power changes.
You could literally drop .4 seconds in e.t. by running on a prepped surface vs non prepped and zero horsepower changes took place. The trap speeds will barely budge though.
If you want to assess power changes you look at datalogs of engine power, air intake, timing etc and then you look at acceleration data such as trap speeds, increase in mph from 1/8 to 1/4 and 60-130 times.
Obviously if you had a better 60-130 time but a worse e.t. you wouldn't think the car made more power when it has the better e.t. than 60-130 time. That's because e.t. is confounded by way too many other independent variables.
I this only to be helpful to those that are interested in actually assessing their modification changes. For those that are just horsing around and having fun then none of this matters anyway.
You could literally drop .4 seconds in e.t. by running on a prepped surface vs non prepped and zero horsepower changes took place. The trap speeds will barely budge though.
If you want to assess power changes you look at datalogs of engine power, air intake, timing etc and then you look at acceleration data such as trap speeds, increase in mph from 1/8 to 1/4 and 60-130 times.
Obviously if you had a better 60-130 time but a worse e.t. you wouldn't think the car made more power when it has the better e.t. than 60-130 time. That's because e.t. is confounded by way too many other independent variables.
I this only to be helpful to those that are interested in actually assessing their modification changes. For those that are just horsing around and having fun then none of this matters anyway.
Safety Car
Joined: Jul 2019
Posts: 4,079
Likes: 2,413
From: Florida
One thing that you may not be considering is that most of the power gains from these mods may be in the lower and midrange rpm 2,000-5,000 and will mostly show on an 1/8 mile run and not as much in the 1/8 to 1/4 times. And we all know our cars fall on their face in 5th gear.
The only time you are between 3500rpm and 4500rpm is a millisecond at launch that doesn't even get counted in your time... rollout
Instructor
Joined: Oct 2022
Posts: 170
Likes: 53
You are not between 2000 and 4500rpm in any run but literally for a couple milliseconds. You are launching at 3500rpm and shifting at redline in each gear.
The only time you are between 3500rpm and 4500rpm is a millisecond at launch that doesn't even get counted in your time... rollout
The only time you are between 3500rpm and 4500rpm is a millisecond at launch that doesn't even get counted in your time... rollout
That's 53mph of 121mph at or below 5,000 rpm if your shifting at 6,500. Think what you like but making more hp at lower and midrange rpm with the same peak hp will make your car faster.
Safety Car
Joined: Jul 2019
Posts: 4,079
Likes: 2,413
From: Florida
If you look at the rpm/mph charts for each gear you may change your view. I stated midrange up to 5,000 rpm not 4,500. If your car actually shifts at exactly 6,500rpm in every gear which mine will shift before that especially when shifting 3rd-5th gears you would still have 53mph of acceleration at or below 5,000 rpm. For a Z51 0-27mph, 35-45mph, 58-64mph, 84-89mph and 116-121mph.
That's 53mph of 121mph at or below 5,000 rpm if your shifting at 6,500. Think what you like but making more hp at lower and midrange rpm with the same peak hp will make your car faster.
That's 53mph of 121mph at or below 5,000 rpm if your shifting at 6,500. Think what you like but making more hp at lower and midrange rpm with the same peak hp will make your car faster.
Anyways you said 2000rpm to 5000rpm.
There is literally zero time spent below 3500rpm and zero time that's counted below 4500rpm.
I said 4500rpm because that's mid range. After is upper on a 6500rpm car.
Instructor
Joined: Oct 2022
Posts: 170
Likes: 53
My point is that you can make more power at lower than peak rpms with bolt ons, run lower et's and make the same peak hp. I don't have a data logger or a dragy, the drag strip is all I have for reference.
Safety Car
Joined: Jul 2019
Posts: 4,079
Likes: 2,413
From: Florida
The car is not at lower power band during wot runs. It is upper middle to redline the entire time.
If you want to feel peppier passing power while lugging the engine at 2000rpm, you go for low end gains. If you want the car to get somewhere faster your want top end gains.
Torque is force.
Horsepower is speed.