I started from turbo and worked back. Seemed logical to me. you would want to open up volume for the exhaust gases where they are the hottest.

 

Data, Mods, and June testing plan:

2006 RS - 3470 lbs w/driver, laptop and Tactrix cable, and safety equipment, 30,218 miles, 38 runs total, 34 in the last two months, ET reduction -.972 second uncorrected for weather and altitude.

Car mods:
Solid Shifter bushings - self machined, hard annodized
OEM MR struts w/Swift Spec R MR springs - struts traded for used parts, springs sponsored by Swift USA
OEM MR BBS wheels w/Kuhmo all season radials, Volk CE28N wheels w/BFG 225-45-17 drag radials - BBS's w/tires 600.00 ebay, Volk's w/tires on loan from 9sec9 and OKIX for testing.

Engine mods:
9sec9 tune - tunes to be released to the community - Free
Hallman MBC - purchased from the for sale threads - 60.00 shipped w/paypal fees
Perrin air filter and Vibrant MAF adaptor retail - 71.99 shipped
Total dollars spent on engine mods to date 131.99 / 368.11 left in budget

Used parts sold to fund engine mods:
OEM Enkies full set 450.00
OEM struts and springs 200.00
Gross 650.00
Net after shipping 500.00

Date, ET, and engine mod history w/best run per outing:
11/21/08...12.998@104.56...tune only,100% stock, BBS, Shell 93 octane
04/04/09...12.862@104.84...retune, BBS, Shell 93 octane
04/11/06...12.913@103.44...retune, BBS, Shell/Sunoco 95 octane, driver issues
05/07/09...12.223@111.32...MBC, air filter, retune, Volks, Shell/Sunoco 95 octane
05/10/09...12.077@112.35...retune, Shell/Sunoco 95 octane
05/12/09...12.024@113.35...retune, Shell/Sunoco 96.5 octane
05/17/09...12.213@111.89...2 step test, Shell/Sunoco 96.5 octane
06/04/09...12.015@112.34...retune, Shell/Sunoco 96.5 octane
06/05/09...12.026@112.52...retune, wounded clutch, Sunoco 98 octane
* all outings run at O'reilly Raceway Park - Indianapolis, Indiana
All runs to date were with all emission controls working, stock engine, stock exhaust w/cat, and stock clutch on unleaded fuel - Shell 93, Shell/Sunoco 95-96.5, and Sunoco 98.

Testing schedule for June:
1. After the clutch install we will baseline the car with the same tune from 06/05/09.
2. Retune if necessary.
3. Flash with 104+ unleaded race gas tune.
4. Run the 2.5" Mil.Spec 100 cell cat with the stock exhaust on 93 unleaded w/26.5 psi street tune. *
5. Flash with 104+ unleaded race gas tune.
6. Evaluate data, select additional mods if necessary.

*Estimated total dollars spent on engine mods w/Mil.Spec 100 cell cat 350.00 / 150.00 left in budget.

Our project goal: 11.50's with 500.00 or less in engine mods.

 

Thanks for your input . We wrestled with the test pipe idea since it would have added only 50.00 to our engine mod budget, but after much thought it was decided to give Mil.Spec's 100 cell cat a try based on it's proven track record for performing at similar levels to the test pipe with all the advantages of running a cat. This will put our total dollars spent at near 350.00, still 150.00 under our 500.00 budget. An E85 tune may still be in the future after we exhaust our gasoline options. Thanks for following our project, Indy and 9sec9

 

^ Slightly OT, but ... looks like I finally get to install the swift springs I bought from you more than a year ago. Finally got a set of Bilsteins on the way. Woot!

l8r)

 

I think this is a great plan. I've been wanting to get a milspec 100 cell cat for a while now but if I can add it into my current exhaust and save the $1k from a TBE I'd be much better off.

Good luck reaching 11.5

 

Thanks for giving me MY marching orders list. I'm printing it and not allowing any deviations in the plan! I'll start working on your race gas tune as soon as I've had lunch. I like your plan and schedule.

 

You guys crack me up . You add and subtract all the little parts that have gone into this but consider the biggest ticket item to be "loners" and don't account for them.

Those Volks with drag radials are massively important to the 60ft times you are running. Get at least $2500 on that list

 

I wish i had my own 9sec9 personal tuner!!! I know i've spent a decent amount of money and i'm still not as fast

 

jid2, I'll comment about the wheels and tires. With your infinite wisdom, how much do you think 3lbs per tire and wheel is worth when being compared to Indy's et's? The price of a wheel and tire has nothing to do with the results, if comparable results are attainable on similar wheels and tires. MANY stock wheels and tires have resulted in 1.6x 60' times. To prove and backup my point, I'll back any figure on a bet that Indy can and will go just as fast on his STOCK BBS wheels and another set of tires. Care to take up the bet? Mitsubishi BBS wheels previously used by Indy are stock items. The tires he's using are dot approved tires. Tires are maintenance items and when they wear out, you HAVE to replace them. His were old and hardened so I loaned him mine. Don't make your inability to achieve similar results jade your clarity in understanding what we're doing. 95% of the posters know and understand our fun in achieving a great result on such few parts. Because you have a mental block is of little concern to me.

 

By the way, the "loners" are only LOANERS and he'll be back on his own BBS before we're through, so I wouldn't concentrate to much on those being an issue.

 

For an engineer you have made more basic mistakes with your build which has consumed nearly one year and thousands of dollars… I'd be pretty embarrassed. The lack of planning, design, and fabrication skills makes me wonder... If I were you I'd be concentrating on my own build before criticizing someone else's .

 

The wheels aren't making any difference.... lots of folks are running the same short times on stock wheels. My best 60ft was made on snow tires.

 

although it appears to already have been decided, i vote for e85. i understand that injectors cost money, but race fuel is significantly more expensive. it's a road less traveled by and for some reason everyone forgets that continuing costs will quickly outstrip the small initial outlays you've already identified as available in the used/for sale arena.

to be honest, i thought you guys were cutting those times on pump gas. i still appreciate your data but i think it's a beautiful thing when we can figure out a way to produce more power while being cleaner. while not the case right now, more emissions testing and stricter enforcement are the future. there's going to be greater demand for tuners who can keep customers out of trouble while satisfying the need for more power. look at what's going on in the california based evo forums - the level of development on stock components on 91(!) while maintaining emissions compliance is incredible.

i say fuel pump, 1000cc injectors, retune. keep all the stock exhaust.

 

I'm not sure how replacing wear item street tires with drag radials is really valid for what you're doing, unless you can demonstrate that they have no effect on ET/trap.

 

Thanks Jeff, that's exactly right. For some reason, that's being conveniently overlooked for unknown reasons. The Volks originally had Dunlop M1 Winter Sport tires which we used for my tuning/testing on the street. Then I decided to put the BFG's on and use them for class reasons at the David's shootout in August. After seeing how bad Indy's hardened tires were, I decided to loan them to him to at least give him a chance of getting reasonable launches. When all is said and done, his BBS wheels with different street tires (maybe my Dunlops) will be back on the car and the results will be very similar.