Hey guys im going to the track and im wondering what octane do you suggest i use ive seen anywhere from 101 to 119 at my local nitrous shop and i saw an article on the edelbrock z where higher octane gas gave that car like 40 more horses on the dyno whats that about i thought it was more to prevent detonation any suggestions will be appreciated. thanks by the way i have a 50 shot nx wet kit

 

With 50 shot 93 octane is more then enough. However if you want to go higher, I wouldnt run higher then 100 or 104 octane. Just not needed for the power.

 

i wanted to go a bit higher here in california the highest octane is 91 which sucks thats the reason im asking.

 

I thought higher octane gas was better for boosted cars, because the higher the octane, the lower the spark. Just something that was told to me, and im just trying to confirm. And I also heard it lowers the chance of detonating also...

 

But dont forget, there can be too much octane which actually will cause you to loose power. Jime runs 114 octane with his 150 shot and I think that even that is too much as a lot of people have no problem rnning 100 shots on 93 octane. BTW: going to try the 100 shot today . I don't think anyone here needs higher then 100 octane. Well maybe Mardi.

 

100 octane is more than enough and for n/a i wouldnt go past that not effective after that. dont worry star my advice to you is on the money.

 

For what it's worth, I ran many 100-shot to 125-shot passes last season, and tried 104 octane, then 91 octane, then back again. Made my last passes on 91 octane, 125-shot, and finished the season with a 13.62 ET 101.72 MPH 2.10 60' set to 50-shot plus 75-shot for both NX stages. Go figure.

I do have the low-pressure 255lph Walbro and AERO FPR, which is essential for fuel pressure, plus some other stuff.

 

I just tried my 100 shot and got nitrous backfire. Blew my filter, maf and intake manifold gasket. I hope thats is it. Car wont idle just dies. C Max, get your tuhas down here and give me a hand.

 

WOW sorry to hear that its every nitrous users nightmare i was thinking of going to a bigger shot i have the jets for a 75 but to be honest you have scared me into staying with my 50 shot so far so good i hope you get your car running again and hope it wasnt anything else. keep us posted.

 

I have run 75 shot for a few years now so I do not know what the problem was. Ill keep you guys updated.

 

probably too much compression and blew the gasket. it happened to me before and i got lucky just had to change the gasket. was the bottle hot enough? it sounds like maybe too much fuel and not enough nitrous, did you check the plugs? also check all your vacuum connections to make sure they are all on im sure they all popped off.

 

This is why if I get nitrous with my boost, I will just run a 35 shot, nothing more.

 

I havent had time to check the plugs. I will check them when I take the manifold off and get a new gasket. I think all the hoses are on. My boy ran 100 shot with no problem. Hm wonder what it was. Bottle was in the green range (900-1050). Wonder how much a stock maf costs.

 

my guess is the nitrous flow wasnt strong enough to accomadate the fuel. when running 100 shot the bottle pressure has to be high in order to flow enough nitrous to match the fuel. i had the same problem the other day but the J&S caught it. same thing, i snap crackled and popped then the car retarded and then i found out my fuel pump is failing at wot. ecms & maf cheap 1 877 687 3267

 

thats why you need some sort of timing retard just in case you reach too high of a compression it can back it up 20 degrees and squelch the detonation.

 

Just got a few questions for you. Are you auto? What bottle pressure do you run at? And when do you start spraying? The time seems a bit low but maybe not. I was only able to get one run in last season on my 75shot spraying some of 2nd and all of 3rd and 4th. Time was a 13.8 @ 104.7 with a crappy 2.25 60'.

 

Since you asked - I use a VLSD automatic ( with a 3000RPM stall Edge just installed !! ) with a dual-stage NX, and 255lph Walbro, and a bunch of other stuff. I was using both 225/50/15 or 255/50/16 BFG DRs. The smaller DRs spun all through 1st and 2nd, and into 3rd. (also use DR-mod from relay on WOT switch). I like the bigger DRs. M&H slicks next season...

I keep the bottle heater going, so I run at 1050/1100 psi, with either a 10lb or 15lb bottle in use. I spray on launch with a 50-shot, then fire stage-two as either a 50-shot or 75-shot as soon as I'm into 2nd gear. I've launched with a 100-shot, but that almost tore the front suspension loose with DRs. I'm glad JClaw came up with the Jbars - I got some of the first group, and they are fantastic.

I had several 13.6 ET runs last season, as well as 13.7 and 13.8 ETs. Best 60' was a 2.0, and several 2.1 launches. I would get only 3 or four runs in per week, so tuning took lots of time, and I'm sure not done yet. I've never gotten over 102 MPH in the 1/4, for instance. Your car seems darn fast for the 75-shot - are you using DRs or slicks? You could knock off some ET if you do, I bet...

The Edge has lots of promise for next season!!

 

soooo, getting back to the point of this thread, what the minimum octane you guys run? they only sell up to 91 here in CA, so do i need to run higher octane gas like i can get at the track?

 

As for the octane, I have been running a 75shot on 93 for some time now and everything is okay. Cant say anything for a 100 shot but I plan to run it in the near future on the same pump gas. I would think 91 is fine but it would be better to hear from someone that has actually ran with 91.

I ran with my 18s on that day which have 235 Fusion ZRi tires. This season, Im getting the same 255/50/16 BFG DRs for my 300zx wheels so I can attempt to spray 1st gear. Cant wait to see what I can run. I dont have much experience with launching because I have always had a wheel hop problem. I have filled motor mounts and put in J-Bars which helped but it has gotten to be the worst ever right now. I have replacement control arms which should hopefully get rid of it. I was really surprised with my trap. With that trap, better launch and some spray in 1st, im hoping to hit some low 13s.

 

I've run in the 13's with 91-octane, track 104-octane, and mixtures of 91-octane and xylene for 100-octane. Incidentally, the track Sunoco 104-octane left my plugs covered in yellow powder - maybe cheap additives, bu it looked weird coating the plugs.

My last track appearance, with a 13.61 ET, was on 91-octane, and 125-shot.

I haven't seen any differences, which doesn't make much sense.... ???

100-octane should be safe, or speed-shop 104-octane from a barrel has been clean for me. No known reason to go higher than that, I believe.