Why, or what ?

[vcosmin]

http://www.youtube.com/watch?v=caXc6...eature=related - blue s2 -
http://www.youtube.com/watch?v=g-7RmdABDIk - s2 from swe.

Ok, both have highly modified engines, gt40r, and the blue s2, has 2.5 , long block stroker, both are on drag tyres. How, or why is so big difference. 10.4 vs 9.4 it is huge , I know the blue s2, has a nos system installed, dont know if they use it ? and if so, i does make so big difference ? the 60ft, is very close, 1.5 vs 1.6 , i dont think that any of this cars have modfied gearbox ratio, but still over 1 sec,

[Jamo]

One is 2.5 long block stroker as you said <- you have your answer

[vcosmin]

One is 2.5 long block stroker as you said <- you have your answer

Doubt that 0.25l of displacement, and a wider power band, will give so much more advantage.

[quattro84]

Pff, this is hard -if not impossible- to compare.
The silver S2 is Karlsson, did a 10.14 with 227km/h end speed two weeks ago. He runs full interior by the way including aircon!
The hungarian car has a 20km/h higher end speed. Just by looking at the footage is seems like the hungarian car:
- has much better traction off the line (because of track/tires/suspension)
- has minimal bodymovement in gearshifting moments (good driver/good gearbox/shortshifter/altered suspension & damper setup)
- uses a very effective antilag setup

Engines is another aspect. Strokers aren't the way to go for dragracing. You don't want to be in the lower revs. Even neglecting the internal engine caracteristics, optimising the engine mapping for these gearbox ratio's is the way to go if you are dragracing.

Just my two cents.

[vcosmin]

Pff, this is hard -if not impossible- to compare.
The silver S2 is Karlsson, did a 10.14 with 227km/h end speed two weeks ago. He runs full interior by the way including aircon!
The hungarian car has a 20km/h higher end speed. Just by looking at the footage is seems like the hungarian car:
- has much better traction off the line (because of track/tires/suspension)
- has minimal bodymovement in gearshifting moments (good driver/good gearbox/shortshifter/altered suspension & damper setup)
- uses a very effective antilag setup

Engines is another aspect. Strokers aren't the way to go for dragracing. You don't want to be in the lower revs. Even neglecting the internal engine caracteristics, optimising the engine mapping for these gearbox ratio's is the way to go if you are dragracing.

Just my two cents.

And yet, all the faster s2, where strokers,also i noticed, very little lag, on blue s2, might be nos ?

[quattro84]

Ofcourse, i was talking in theory. Building a stroker is much easier than building a revver. Strokers are good to spool up big turbo's. But maximum power comes with maximum rpm (if your turbo is big enough to make some torque), so theoreticly you want to stay in the high revs.

Look at F1. If you want power, and you are limited in displacement, revs is the way to go. Smaller stroke means less inertia forces, but bigger problems with balancing and reliability. Revving cost a lot more money compared to stroking.

[Audi_CQ]

Look at F1. If you want power, and you are limited in displacement, revs is the way to go. Smaller stroke means less inertia forces, but bigger problems with balancing and reliability. Revving cost a lot more money compared to stroking.

But how would an F1 engine be if only bore and number of cyl was limited and stroke was free

[Jamo]

Ofcourse, i was talking in theory. Building a stroker is much easier than building a revver. Strokers are good to spool up big turbo's. But maximum power comes with maximum rpm (if your turbo is big enough to make some torque), so theoreticly you want to stay in the high revs.

Look at F1. If you want power, and you are limited in displacement, revs is the way to go. Smaller stroke means less inertia forces, but bigger problems with balancing and reliability. Revving cost a lot more money compared to stroking.

So why are there a lot or Scandinavian strokers running over 1000 bhp?

[GazzaG60]

i wouldn't say a lot but there are a few.

personally i believe a good/expert engine builder and tuner can extract it either way. for the majority capacity is key especially for low down and spool once on boost a lot of the benifits are gone

[Jamo]

You'd be shocked if you visited some of the non english forums what is out there................