- Dec 9, 2005
- 106
Hey everybody, just wanted to show some results with the Gen 2 SC. Car has FRPP long tubes, FRPP muffler, Accufab TB, and 91 OCTANE. Also note, this is 3rd gear. 4th gear showed 25-30lbs more torque, same HP.
Whipple Gen 2
- Thread starter Whipple Charged
- Start date
MAD IN NC
Proud Owner/ BOD blah bla
Mase
GT Owner
nice numbers for sure :thumbsup, but i'm surprised you run the mixture that lean.
What kind of intake temps are you guys seeing vs delta ambient air temps?
What kind of intake temps are you guys seeing vs delta ambient air temps?
Hi Dustin,
Very impressive numbers. However, I too am concerned about a/f's - they seem high. In particular, the area around 6000rpm, the engine is seeing just over 20lbs of boost with a/f's near 12.5:1. If this were my car, I'd rather have around 11.5:1 - and perhaps a few less ponies. Is a richer mixture possible with the tune or are we seeing the limits of fuel pumps and/or injectors?
Very impressive numbers. However, I too am concerned about a/f's - they seem high. In particular, the area around 6000rpm, the engine is seeing just over 20lbs of boost with a/f's near 12.5:1. If this were my car, I'd rather have around 11.5:1 - and perhaps a few less ponies. Is a richer mixture possible with the tune or are we seeing the limits of fuel pumps and/or injectors?
Empty Pockets
ex-GT Owner
mardyn
GT Owner
BlackICE
GT Owner
My understanding is that the case is the same, but the internal rotors are new. They displace more air per revolution, thus give more boost at any given RPM. Maybe Dustin can chime it here and tell us the more about the specs. I would like to know how much more displacement, the abiatic efficiency vs. the old rotors and the cost to retro fit them into a Gen 1 case.
Just out of curiosity, why show the lower 3rd gear results? Don't most shops show 4th gear?
Either way, impressive, especially for 91 octane and what seems to be a reasonable amount of boost. Any info on improvement of the IATs?
Either way, impressive, especially for 91 octane and what seems to be a reasonable amount of boost. Any info on improvement of the IATs?
Fast Freddy
GPS'D 225 MPH
the GT's 4th gear is not a 1:1 ratio. as a result of 4th gear being overdriven i would assume that this would show a higher # than what 1:1 would show and thus the reason Dustin decided to do his pull in 3rd gear. i am not sure which gear would be closer to a 1:1 reading? obviously 3rd gear is far from 1:1 but its not overdriven like 4th gear is in the GT, so maybe the results in 3rd gear are more accurate?
Dustin how much more HP and TQ do you think this setup could make with a 100 octane tune? i bet it would make 800 rwhp :thumbsup
Last edited:
fjpikul
GT Owner
- Dec 9, 2005
- 106
The displacement is the same, the Volumetric Efficiency is increased. Typically VE was somewhere around 85-95% depending on boost and rpm. The Gen 2 picked up nearly 12% VE at rpms lower than 10,000 and 7% at high rpms. This gives you more air volume at the same rpm. Also, because it leaks less, temperature is decreased for the same volume of air. AE was increased 5-8%.
Dustin
Empty Pockets
ex-GT Owner
- Dec 9, 2005
- 106
No, there was still room with injectors/pump. The red line is 12.5:1, so this got to a max of 12.25:1. This AF on top varies .25 depending on the ignition firing. Also, this has long tubes, so the AF is reading 1 cylinder, so you get slightly higher pulses than a constant flow in one collector. Also, with the Dyno Jet Wide band, it's commonly .25 AF leaner than our Horiba's, which are more accurate at the 13:1 and lower numbers.
Thanks,
Dustin
- Dec 9, 2005
- 106
Few reasons, first, when I first did my first GT, where we built the pulley and first tune, I started with 3rd gear pulls, and everyone after that. Therefore, all my data is with 3rd gear pulls. Data logs, graphs, info, etc. I've certainly run 4th gear runs. I've back to back them, at this level, it's 25lbs of torque more.
Dustin
- Dec 9, 2005
- 106
No, 3.25" pulley. Long tubes and high flow mufflers drops boost 1-2psi, especially at this flow level.
Thanks,
Dustin
BlackICE
GT Owner
Fast Freddy
GPS'D 225 MPH
i wonder how many degrees of timing he is runnin on that 91 octane tune? i bet with 100 octane gas and more timing he could make 800 rwhp......
AlohaGT
GT Owner
Dustin, I'm convinced - sign me up. :thumbsup I'm airing my FGT to Kendall in May prior to the Le Mans trip. Please set aside a Gen 2 for me. I suppose we'll (at least Bony & I, maybe others?) land on the Continent with the first Gen 2s.
I can hardly wait! :banana:banana
I can hardly wait! :banana:banana
- Dec 9, 2005
- 106
Very, very soon, and I'm pretty confident it will leave here with 800RWHP on 91 octane gas. Got 2 more tricks in my bag :banana
Dustin