compres/NITRO?

I plan on useing a small percentage of Nitro or trying it but my BBC/1471hh is a little high in the compression area about 11:1 How far can I go % wise and be safe I don't plan on squeezing it to hard but right now it's on kill at 50% od w/ lots of fuel, was thinking about 30% overdrive 12-15% Nitro? Just don't want to kill it to early in the season.

 

Let us all know, Will you!

 

I assume this is the same 496 you are running at 9600 rpm. going from 50-30% you will loose 6-9 lbs boost depending on your blower. thats 6-9 points total compression. and you plan on making up for that loss of HP with 12-15% nitro? actually making more power or a waste of time. If you want a safer way to increase power try vp's m-5 alcohol. should make about 4% more if the tune is right.

 

4% is a pretty big claim

 

everybody's an expert

careful calling me a liar I have spent the last 12yrs involved with VP fuels and dynoed many of there products. I have tested the m3 and m5 on the dyno and at the track. 4% is what THEY first claimed and I was able to verify it. If you dont believe, I dont care.

 

I'm not really trying to make up for any power loss turning the blower down I just figured it was a good idea, I just want to try it out for the fun of it but don't want to scrap the thing. I spin the thing at 9200 rpm but have been to 9600 with out hurting it. I would like to back it down a little just to save on parts, I just like to experiment a little now and then and was lookin for some opinions.

 

I am very curious to know what if any changes need to be made to an existing tuneup for M5, and whether you performed any A/F sweeps during your dyno testing with either M5 or nomal meth? I'd like to try M5 in mine, but would like to know more beforehand what I'm to expect. Sounds like you work for/with VP? Thanks.

 

loosecannon, Over the years Ive seen many try fooling with nitro. for starters Its alot harder to get any nitro nowadays because of homeland security. try a rear gear change, it might surprise you. and like I said before the m5 might give you alittle kick. there are some other chemicals that work even better. believe me you can do alot with what you have for now.

 

TOL, I have had the fun of selling vp products for 12yrs. its given me an in to various engine builders, dynos and at the track runs. the m5 will not pass a fuel check for top alcohol. for most tunes I prefer to tell everybody to fatten 5% and work from there. Im sure you know that nobody can give a blanket tune thats spot on; to many variables.

 

Hey "T" -loosecannon Better check and see if you can even get any nitro first I just talked to a local VP dealer and they told me that they wont even try to get it now.
Get your set up sorted out before you try to make more power .
No offense but you have a lot left in your car , you make good power but you need to get it down the track .
Money may be better spent on a promag with a six shooter or 8973 box with out trying to blow it up with expensive fuel .

Like I said no offense intended hope you don't take this the wrong way, just friendly advise. Bob

 

Thanks Mark. I'm curious to know more about how M5 differs from regular meth. I've been told that it already contains top lube, which is why it won't pass fuel check. That's okay for us. I'm assuming that it must also be further oxygenated somehow, hence the extra percent fuel required? I've heard anecdotally that it vaporizes more readily than regular M1 meth. Is this correct, and if so do you tend to see any changes required in terms of spark lead when running M5 versus regular meth? Any differences in terms of the optimal fuel split above and below the blower? Does VP have any documentation which can be read or requested regarding M5 versus M1? I realize that all tunes are different, but I'm just curious about general trends when moving to M5 from regular M1.

 

m5

m5 alcohol is alittle heavier fuel than m1, so you could pour it in and tune from there, if you really understand how to tune. pour any new fuel in and leadfoot it and dont cry to me about the results. spark plugs need to be read. timing will depend, fat head or fuel heads. hi or low compression, etc. its just safer than nitro. the m5 does have additives that help the burn more efficiently. hence alittle more torque and hp. steve burns is the guy for vp r&d. when I first asked him what he put in the alcohol he got very guarded. they have spent alot of money on the research. depending on the tune you could see a tenth or so. it will be more consistant if you bracket race.

 

Thank you to all w/ opinions I do appreciate any type. I'm just lookin for a little change get board kinda easy, and no problem Bob I know where you are coming from.