I mentioned stock manifolds in regards to the nitrous cars becuase it makes a much bigger difference than the supercharged cars. While the decomposed nitrous has a higher content of 02, and therefore a lower combustion gas volume per specific output, it doesnt have the increased pressure differential the supercharged cars do. I could do some math to relate what boost level is necessary compared to what shot size to make the supercharged car work better with the stock manifolds but suffice to say without some static pressure to force the air out the sprayed cars are gonna choke off with stock manifolds. Iirc cabracco85s 12.0 run had a 116 trap on a 100 shot?
Im not going to pretend to be Tops at math. I can just relate for the hotrod stuff Ive been threw over the years. Maybe a little less complicated terms for me.
The N02 still needs to be pulled into the motor Via vac of the motor/pistons. This takes some of the positive effect of chemical enhancement out. N02 cars run with LOADS of Tq and a steady feed of HP. STill when you look at a power chart of a N02 car it stays within the curve (less the power initiation) of the motor.
If any of this babel makes sense it was meant to say on N02 motor mods are more usfull then on boosted cars due to the motor still is using its base component to bring in air/power. Also where a boosted car makes more power faster as the RPM’s go up. The N02 cars keep with the motor curve. So believe it or not. If done right N02 is safer for the motor then boost.
x2, this was I was describing from the theoretical side. The motor is still normally aspirated, nothing is forcing it in. Iirc when designing headers for nitrous cars you are supposed to compensate pretty significantly as the shot gets bigger.
Thanks for posting Saki! That was the first run of the day before the clutch let go. Slipped on that run in every gear. My second try went right to red line in 2nd so I let out and parked it. Spoke with Andy @ SB and he said it was because I put too much heat in it. Me and a few others agree that’s total BS. Looks like I’ll need to step up to a JHM clutch.
I think its only the case (lwfw chaning high rpm shifting) when you have a JHM short shifter, all those stock shifter preffered goofs will just miss out… haha
haha shouldnt that be thank you for jumping on board and being one of the first 05s to get a tune (I believe only Jay’s car was tuned before)? Original tune revision with check engine light, milltek catback, probably 30whp down from where it should have been. 90* day with low air pressure and 400 cars at the track. No 94 octane either, full weight and then some. No launch control.
My car was not on the 100 shot when i went 12.0 it was the jetting for the 70 shot as i dropped the other jets i had. Which was for a 85 and 100 shot. Its been awhile since ive been to the track with my s4. Id have to pull the jets to see which ones are in there now. If they are the 85 then that was what i was running when i went 12.0. I dont remember off the top of my head which jets i dropped and lost. I do think i was at the limit for the stock down pipes which was around a 12.5@110ish which is about the same as the stock s/c auto went. As far as i now me and the auto cars were the only ones that has maxed out the flow for the stock dps. As for the stock manifolds we will see what times i can get out of it. I think there is a 11.7 in my car the way it sits.