I use an SAFC to lean out with, and use an auto ecu on my 5 speed stick. I've tuned biki before on my friends cars and yes about a 12.7:1~13.2:1 is better if you increase the ignition timing which would increase the cylinder tempratures, this is also dependant on manifold and header modification.Last time I used my friends wide band I was running 14:1 AFR flat. It makes alot of power if the distributor isn't advanced. I tuned it from a 13.7:1. When I did advance the distributor it felt as if I lost alot of torque at WOT, so I left timing at 20BTDC, I wouldn't be surprised if it made decent if not more power at stoich even dropping the timing a little more down towards 18BTDC.Just so you know I'm not a liar like most people in this forum I have a quick pic.Just with bolt on's and SAFC adjustments I was able to run at 15.3 at infinion raceway, with a .838 reaction time it was a bit short of a 16.1. NHRA tracks include reaction time, it is the most rediculous thing I have ever heard of. I run head up wiht my friends H22 prelude running a VAFC.SSS wrote:How are you making your peak power at 14.7:1 at WOT in the upper end of the rpm range? Most NA motors tend to make their peak power with AFR's around the 12.8-13.7:1 range.
i dont remember about back then, but these days theyre required to run gasoline, its one of the things that keeps their power in checkWDRacing wrote:Didn't they run on basically straight Toluene with like a splash of water?? I can't remember exactly, I used to know when I was getting into the DIY Alky Injection. But methonal is just so much cheaper...hence my lapse in memory...or perhaps it was the beer.
High compression scares me. My friend at Nissan of Antioch owns a 350z. He added a Greddy turbo kit and fried the motor before we even made it to the freeway. There is just way to much fine tuning involved when the compression is higher than 9.5:1 CR. Alot of my honda buddies have done super charging with the jackson racing kit on the K20a's, and one of my friends has an experiment on his H22 with a 10.0:1 CR. I have noticed that there isn't alot of boost on high compression before it blows.WDRacing wrote:All you need now is a little boost....LMAO. Sorry, couldn't resist.
Have any of you guys considered a low boost high compression build? I don't know of anyone in KAT who's actually attempted it.
I have ALOT of idea's in that category, but I'm more of a high boost kinda guy myself.
WD
If you look at an F1 engine lay out they utilize individual throttle bodies, actually WD wasn't it you that posted the Renault engine being tested? Sitting static this engine can only rely on vacuum to draw air into the cylinder. Once the engine is in the vehicle and the airbox is attached, you put the car in a forward motion, and air is pushed into the chamber. Now I don't have numbers or speeds but the engine continues to suck in more air than the forward motion can push into the chamber leaving a vacuum, until a certain speed. Once that speed is reached than you would have a positive pressure, how much pressure would depend on the speed. The only fallacy in that is an F1 engine is so efficient at sucking air in that the minute amount of positive pressure created becomes negligeable. In our cars you would call this a ram air and it does help actually. Maybe we should move the FI and NA stuff into the Technical forum?DjPantsSpecR wrote:lol, a few things have happened in this thread.
the only things i wanted to add about any of this debate was this:
on the level of these F1 cars, the N/A motors do infact, as you say " have the magical hand of boost gods" IN them.
you cant tell me that an all-motor engine with a plenum and runners tuned to high rpm, doesnt use a gain of at least 1-2+ psi depending on max rpm.
thats why N/A motors like plenums under the size of their displacement. less volume allows the air in the plenum to be "packed" or pressurized more easily by the columns of air bouncing back and force and inverting.
turbo motors like plenums to be 100% or greater than the motors displacement. for example i hear Xcesssive has choosen 3.2 liters for their KA plenum. This is because turbos are already pressurizing the air, and too small of a plenum couldnt move enough air. this will start to cause turbulence and possibly reversion of sorts.
so... i guess all i wanted to say is that N/A motors use pressurized air to make more power....
and we're missing the point of this whole thread:it sucks and its four pages.
You should be beaten...ShionS14 wrote:Unfortunately Cosworth is no longer an engine supplier as of this year though.
And I totally spaced and didn't realize I had put 8 g's as deceleration it is between 3 and 4 g's.
Even better!!! The year before that I ran a 15.1 just slightly shy of a 15 flat.There is a large difference in those times from 3 things that ocured the next year.My synchros are now shot in 2nd and 4th gearIt was 10 degrees cooler the year before, this years time the temprature was 99.8 degrees.My VLSD now has more slip as now it works like an open diff.I am .2 seconds shy from making a 14.9 which is the average 1/4 mile time of an sr20det.nismo_power wrote:
so ur saying that ur car is stock with just bolt ons such as I/H/E and a safc, ur running a 15.3 at the tracks without the reaction time???cause if thats the case then u have a fast a$$ car....and ill be doing that too!!!!
Dude, you need to either:sliders wrote:wdracing
1.im not lying