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Discussion Starter #1
2008 Supercab, short bed, FX4

Spartan 250 tune
AFE PG7 airfilter in stock box
DPF delete
MRBP 4" mufflerless catback
3.73 gearing
34" tall Terra Grapplers on 20x10 XD wheels
Leer 700 cover, heavy
7842 lbs with me in it and a 40% fuel, runs last night were almost full tank


best run was a [email protected], 1.8914 sixty and a [email protected] in the 8th mile, it wheel hopped all night but this run i kept it matted and it got a 1.8 sixty.
 

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Discussion Starter #3
Yeah no problemo, i asked what it would do and no one could say so hope this helps. I have no clue why it wheel hopped all night but i did have a nail in the rear driver side and it was 20 psi prior to that run, so i filled it back up. On the street it never does and grabs hard. Maybe its the VHT, who knows.
 

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Discussion Starter #5
First two runs I ran about 20 psi of boost to launch or more, and the last run I did the same. The third run I tried a light launch at 10 psi of boost and it hopped as well and went 2.0 sixty.


Tire pressure was 75 psi on 3 corners and 20 on the one, last past they were all at 75 psi. That will dead hook on 20 psi on the street.
 

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WWDD
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10,531 Posts
thats alot of pressure next time drop down to about 45 up front 30 or so in the back, that should help a ton
 

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WWDD
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weight hurts you way more than what you make up for in drag loss (if any) myth busters tested that and said that a tailgate up was the best for fuel economy.
 

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WWDD
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i could cut 1.80s on 35s and 37s with the same trap speed no reason you couldnt cut that or better
 

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6.4 STROKER
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I'm running 37" BFG AT KO's on mine and getting a 1.8 60' with a SCT O.R box tunes. I dropped my tire pressure to 40psi in all 4. I'm also boost launching h**l outta it too.
 

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6.4 STROKER
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Not that I can notice. Truck doesn't hop, it hooks and books
 

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WWDD
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Well im not far off with a 1.89 sixty then. And you guys get no hop either?
No but i have traction bars so its solid even if the tires spin. I only launch 12-17 psi of boost though. you might try launching at 1700-1800 rpm some say thats easier than boost.
 

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Just curious but what were some numbers the 250 has put down? I run it everyday except going down for towing. Hadnt had this truck on a dyno and was just wondering.
 

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Discussion Starter #19
The dyno graph on Spartan's website shows like 490 rwhp and 1013 lb/ft if i remember correctly.



If I could cut a 1.7 sixty the truck will go 13.6 or better, plus if i cut 300 lbs off the truck for the track i might pick up another mph as well and thus may cut my ET down as well.
 

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The dyno graph on Spartan's website shows like 490 rwhp and 1013 lb/ft if i remember correctly.



If I could cut a 1.7 sixty the truck will go 13.6 or better, plus if i cut 300 lbs off the truck for the track i might pick up another mph as well and thus may cut my ET down as well.
The dyno graphs on the website for that tune are a little dated.

13.6 is definitely achievable with the 250 tune. I think the reason we haven't seen any mid 13 second times with the 250 tune is because no one really races with it.
 
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