Best setup for ~9.49 sec 1/4 mile and also track day capability

[Andy13186]

I want to build my 10r80 car to be able to do a 9.49 1/4 mile or less and also be able to run on the track for a road course style track sessions for 15 mins without problems. I do have access to e85. Currently thinking of a whipple setup without too much boost and with the oversized heat exchanger and a good e85 fuel system. I want to keep the stock cats, would they melt from a track session on e85 with a whipple setup that can run 9s? I also want to be able to switch over to 93 octane without changing the pulley. Is this possible with a whipple setup? What would you guys recommend for supporting mods, or would you all say a different power adder would be a better choice? I know turbos have the ability to change boost but I dont really like the kits that are out compared to a whipple setup, they seem like more stuff can go wrong. Let me know if you have any suggestions, thanks.

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[tj@steeda]

Andy,

If you give our build team a call - they can point you in the right direction. Our Silver Bullet just ran a personal best 9.787 ... which is also made for the streets.

We also have our track set-up ... we can blend the best of both worlds

 

[Jackson1320]

I want to build my 10r80 car to be able to do a 9.49 1/4 mile or less and also be able to run on the track for a road course style track sessions for 15 mins without problems. I do have access to e85. Currently thinking of a whipple setup without too much boost and with the oversized heat exchanger and a good e85 fuel system. I want to keep the stock cats, would they melt from a track session on e85 with a whipple setup that can run 9s? I also want to be able to switch over to 93 octane without changing the pulley. Is this possible with a whipple setup? What would you guys recommend for supporting mods, or would you all say a different power adder would be a better choice? I know turbos have the ability to change boost but I dont really like the kits that are out compared to a whipple setup, they seem like more stuff can go wrong. Let me know if you have any suggestions, thanks.

What you’re asking for pretty much any boosted application should be able to handle. you can switch to 93 as long as you are setup for 93 and just change your tune for the e85 But honestly I don’t think you’ll need to I think you can run in the 9’s on 93. I would focus on some cooling system upgrades. The road course is really going to put your cooling system to the test a quarter mile is the easy part

 

[EFI]

You're in for a losing battle, you're not going to keep that Whipple cool on the race track for 15 minutes even with major cooling mods. Check out the road racing section as there are some FI guys on there and they all have heat trouble.

If you just want to putt around for 15 minutes driving at 5/10 and short shifting, sure you can do it. But if you want to actually drive 9/10 with that setup it ain't gonna work. With this, you can't have your cake and eat it too. Choose one or another and go with it.

However a twin turbo setup might be better for you if you really want to try. The turbos will run cooler on the track and you can easily set them up to run like 5-6psi and keep it all cooler. You don't need a full 9 second car on a road course.

 

[Adamone92]

You're in for a losing battle, you're not going to keep that Whipple cool on the race track for 15 minutes even with major cooling mods. Check out the road racing section as there are some FI guys on there and they all have heat trouble.

If you just want to putt around for 15 minutes driving at 5/10 and short shifting, sure you can do it. But if you want to actually drive 9/10 with that setup it ain't gonna work. With this, you can't have your cake and eat it too. Choose one or another and go with it.

However a twin turbo setup might be better for you if you really want to try. The turbos will run cooler on the track and you can easily set them up to run like 5-6psi and keep it all cooler. You don't need a full 9 second car on a road course.

@sigintel has some experience using a whipple on a track believe. He might could give some good insight on that.

 

[engineermike]

I believe sigintel lowered his boost level. You can drop the Whipple down to about 8 psi with just a pulley or lower if you’re savvy at tuning yourself.

 

[Andy13186]

I believe sigintel lowered his boost level. You can drop the Whipple down to about 8 psi with just a pulley or lower if you’re savvy at tuning yourself.

Would 8psi with e85 be capable of 9.49? I also dont want to do weight reduction, just a drag pack

 

[engineermike]

Would 8psi with e85 be capable of 9.49? I also dont want to do weight reduction, just a drag pack

I doubt it. I wonder if you could do something creative with the torque management to run a pulley small enough for drag racing but limit load for road racing.

 

[Adamone92]

Would 8psi with e85 be capable of 9.49? I also dont want to do weight reduction, just a drag pack

Switch pulleys and maybe even tune between drag and track?

 

[engineermike]

Switching from 93 to e85 and from road to drag will be tough to do optimally without swapping tunes and pulleys.

 

[Andy13186]

Switching from 93 to e85 and from road to drag will be tough to do optimally without swapping tunes and pulleys.

edit * oops misread this, ignore prior post

 

[engineermike]

@Andy13186 I was referring to your first post where you mentioned wanting to be able to run 93 as well.

 

[Andy13186]

@Andy13186 I was referring to your first post where you mentioned wanting to be able to run 93 as well.

I misread your prior post, but I still dont see why it wouldnt be easy to just switch from 93 to e85 with the same pulley but different tune. I thought E85 would just make more power and take more timing unless I am mistaken

 

[engineermike]

I misread your prior post, but I still dont see why it wouldnt be easy to just switch from 93 to e85 with the same pulley but different tune. I thought E85 would just make more power and take more timing unless I am mistaken

You can do that, but if you pulley it for 93 I’m not sure that just e85 will achieve the mid 9 second Et you’re after. Once you get over about 11 psi you start losing power on 93 due to spark timing retard required to live at 12/1 compression. I think it would be tough to reach a mid 9 on e85 at 11 psi.

 

[sigintel]

TLDR: My promise: max fun/$ = Go sign up for a track day stock this second!

"..... for 15 mins without problems. "
Unfortunately, Not at the same power level as 9s... You'll have to back way off or get a GT500.

Steeda has 2 different cars for a reason..

Spend your time and money on track, car needs nothing.

I loved my Whippled 15 mostly for instant torque; effortless flow in traffic. For running road courses, it was mostly about having the most fun, not necessarily the fastest lap times. I previously worked in the auto industry logging years of track time, so I'm old and like fun as much as being fast. I actually dropped down to a 4.0 pulley second season to try and work on lap times and improve durability/thermal issues. I promise the Steeda track car NA would be faster than my Whippled 15.

I think you might want to track the car stock for at least a season before adding weight and power. You will be HPDE with an instructor before being let loose solo. You would likely want to be running with the 2nd or 3rd run groups by second season before adding power. You may have sooo much fun you will just stay stock or go E85 NA. Add in suspension stuff when you have a good baseline feel and only change one thing at a time.

The drivetrain is not capable of running 15 minute sessions maxed out at the same power as you would run 9s without lots of time, cost, research, mods. You need to ease up to make laps. Whipple weight hurts corner speed and you will get passed by lower power cars.
15x60 = 900 seconds
9x1 = 9 seconds
900/9 = 10,000% increase

I sold my Whippled 15 to go TT on my 2018, then got side tracked endurance racing an Audi wheel to wheel.

PM if you like.

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