1/4 mile with Diesel

9143 Views 20 Replies 10 Participants Last post by _MerF_, Apr 19, 2016

Poje

Discussion Starter · Apr 17, 2016

2

Yesterday, i went on the track for the 1st time with my Diesel, but it wasnt the 1st time in my life. Some of you know my previous threads about lapping or drag racing. :grin:

This is what i did with my previous RS Cruze with Vermont tuning :

Text Font Document Line Paper

Btw when i drag race, i always go to manual mode (autobox) and deactivate electronic assistance. I also torque-brake for better starts.

So i did this with my Diesel :

Compared to my old Cruze, i did about 5mph faster and almost 0.2s quicker. For a car that weight more then 200lbs heavier, the power difference is quite clear! :eusa_clap:

I also avg 10mpg better with my Diesel. :signs053:

Btw the stock Fuel economy tires that the ECO and Diesel have are garbage for launching a car from a stop, lol. On my 1st run, i torque-braked hard and when i launched, i was spinning in 1st and 2nd gear so much that i missed my shift to 3rd, lol. Im sure that with better tires i could bring it down to 15.4 - 15.5 with the MPH i have.

Heres a calculator for HP/weight for 1/4 mile : https://robrobinette.com/et.htm

If you enter the stats for a 2014 Civic Si, they say it should do 15s flat, witch is possible for a good driver. Its quite acurate and with a Diesel weighting 3500lbs, they say i have around 210hp at the flywheel, witch is in line with the 50hp tune of Fleece.

Diesel POWA! :th_salute:

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money_man

· #2 · Apr 17, 2016

So you ran a 15.7 with the fleece 50 tune?

What did you run with the stock ecm?

Snipesy

· #3 · Apr 17, 2016

14.0 or bust.

bostonboy

· #4 · Apr 17, 2016

those are great numbers. & what kind of tune did you have on the V tuner? thanks & keep posting numbers good luck

money_man

· #5 · Apr 17, 2016

Anyone have their actual 1/4 times for trifecta vs their stock times?

oldestof11

· #6 · Apr 17, 2016

The car stock feels like a 16 second car.

I agree, the stock tires are garbage. Since I am a bracket racer, I thin when I start this year I'll be letting the trans do the work and launching with TC enabled.

Poje

Discussion Starter · #7 · Apr 17, 2016

bostonboy said:
those are great numbers. & what kind of tune did you have on the V tuner? thanks & keep posting numbers good luck

Its a custom tune, but very close to the standard tune.

Reactions: 1

Poje

Discussion Starter · #8 · Apr 17, 2016

money_man said:
So you ran a 15.7 with the fleece 50 tune?

What did you run with the stock ecm?

I dont know, but from the feel of it, i would say a stock should do around 16.2.

The Diesel is an heavy car and im heavy too, lol. (250lbs)

money_man

· #9 · Apr 17, 2016

Yup. Seems car and Driver claims 16.3 seconds stock. Thought we ran a 1/4 in the 17's so that's a pleasant surprise.

http://www.caranddriver.com/comparisons/final-scoring-performance-data-and-complete-specs-page-4

Reactions: 1

Poje

Discussion Starter · #10 · Apr 18, 2016

money_man said:
Yup. Seems car and Driver claims 16.3 seconds stock. Thought we ran a 1/4 in the 17's so that's a pleasant surprise.

Diesel Car Comparo: 2014 Chevy Cruze 2.0TD vs. 2013 Volkswagen Jetta TDI Comparison Tests - Page 4 - Car and Driver

Yep, i was close! :eusa_clap:

Btw there was a modified VW TDI there, it did 15.6 at 90mph, so 0.1 quicker, but 2mph slower.

I also do 7mph faster then stock, so the power is there.

BowtieGuy

· #11 · Apr 18, 2016

The crazy thing is the gas Eco MT was tested by the same Car and Driver and tested to be just as 'quick' as the diesel:
2011 Chevrolet Cruze Eco – Review – Car and Driver

Black20cruze

· #12 · Apr 18, 2016

I finally lined my ctd up at a stoplight with a Jetta tdi, both cars black On black, I scoot up and switch to manual waiting for green.....look over and it's a girl looking down texting!!! Oh well, I'll keep searching, lol

Reactions: 2

Poje

Discussion Starter · #13 · Apr 18, 2016

BowtieGuy said:
The crazy thing is the gas Eco MT was tested by the same Car and Driver and tested to be just as 'quick' as the diesel:
2011 Chevrolet Cruze Eco – Review – Car and Driver

Ya, its logical, since the Diesel has almost 500lbs more to move around. 138hp vs 151hp, lol.

Go to my 1st post, there's a link to a Drag time calculator for HP + Weight.

Poje

Discussion Starter · #14 · Apr 18, 2016

Btw i found another calculator on the net that tells you how much Flywheel HP your car has if your finished at Xmph depending on the weight of the car.

For a 3500lbs car to finish at 92mph a 1/4 mile you need 210hp. Thats aprox, but still in line with what is advertise as a 50hp tune from Fleece.

money_man

· #15 · Apr 18, 2016

Wouldn't that depend on gearing as well?

MP81

· #16 · Apr 18, 2016

money_man said:
Wouldn't that depend on gearing as well?

Absolutely.

My Cobalt would be much quicker in the 1/4 mile if it didn't end up in 3rd gear, which is 1:1, for the last ~1/3 of the run.

Reactions: 1

_MerF_

· #17 · Apr 18, 2016

Why do slushbox drivers think they can shift their cars better than the TCU can? In a straight-line acceleration race (drag race) there is no way switching to manual shifting could ever help.

Unless your tune enables only in manual mode, which I know was a thing for a while. Otherwise, stop being silly and let the car shift.

Poje

Discussion Starter · #18 · Apr 18, 2016

_MerF_ said:
Why do slushbox drivers think they can shift their cars better than the TCU can? In a straight-line acceleration race (drag race) there is no way switching to manual shifting could ever help.

Unless your tune enables only in manual mode, which I know was a thing for a while. Otherwise, stop being silly and let the car shift.

That made me laugh, but i'll be nice and explain :

1. In the manual setting, in any Cruze autobox, the torque converter hydraulic pressure is higher, so the shift are crisper and power transfer better to the tarmac.

2. In the manual setting you can choose at what RPM you will shift and with a Diesel, thats important, since in automatic it shifts 500 rpm over the powerband, 4500, when the power drops at 4000.

I hope you understand now.

Reactions: 1

_MerF_

· #19 · Apr 18, 2016

Poje said:
That made me laugh, but i'll be nice and explain :

1. In the manual setting, in any Cruze autobox, the torque converter hydraulic pressure is higher, so the shift are crisper and power transfer better to the tarmac.

2. In the manual setting you can choose at what RPM you will shift and with a Diesel, thats important, since in automatic it shifts 500 rpm over the powerband, 4500, when the power drops at 4000.

I hope you understand now.

So you have side-by-side slips of the car in manual shifting and shifting on its own and there is a measurable difference in the ET?

Chris Tobin

· #20 · Apr 18, 2016 (Edited)

I though the Cruze Diesel would be a great bracket racer... BUT, with the overboost function, it is hard to be consistent from run to run making it guesswork for Bracket Racing. When I was reviewing the car I entered a bracket race at an event I was covering and the ET varied by 0.5-seconds if I remember correctly... I'm not sure if the Fleece tuning allows "overboost" all the time to make the car more consistent, but stock it was not a good bracket racer...

Personally I liked the way the car shifted on its own versus manual mode which seemed more hesitant to respond to me. Also, I highly doubt that the line pressures are altered in the transmission based on manual mode vs drive, but I have no documentation to back up my assumption so I could be wrong!!!

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