mine did the same thing, hit peak boost then fell off jaggedly. found my exhaust housing, bov, couple of vacuum hoses, brake booster hose was leaking when i touched it. didnt leak when i tested it without touching it. good luck, mad props to u.
Guess my Dyno #'s
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Thanks everyone, I took it out today..
Tightened the BOV
Replaced some suspicious vac. lines
fixed my gain % on my boost controller
I think the biggest difference was adjusting the gain. Before the dyno I had the gain set at 1/2 of what it is now.. no wonder my boost was falling off. Now at 25PSI it pulls to redline.. I'm currious how much of a difference this would really make tho?
I'll dyno again in a few weeks to see what i can musta'.
Tightened the BOV
Replaced some suspicious vac. lines
fixed my gain % on my boost controller
I think the biggest difference was adjusting the gain. Before the dyno I had the gain set at 1/2 of what it is now.. no wonder my boost was falling off. Now at 25PSI it pulls to redline.. I'm currious how much of a difference this would really make tho?
I'll dyno again in a few weeks to see what i can musta'.
I don't know anything about the NA and GTE cams on the 2JZ, but do you think switching to the GTE cams would help you some?
Are you using race gas? I wouldn't try running that kind of boost without C16 in the tank. I wouldn't go back to the dyno until you really figured out what's going on. Its obvious something is not right in the high RPM's (right where a T70 is going to start making lots of power. Start with the most obvious things like boost leaks, vacuum leaks, properly gapped spark plugs, good ignition. Thn I would try to talk to a tuner about your timing maps if your not 100% sure. Good luck..
I'm running 1600cc's of methanol/water (85%meth, 15% h20). Detonation shouldn't be a problem.
Honestly I don't know what the problem is.. I guess I'll keep playingwith it.
Honestly I don't know what the problem is.. I guess I'll keep playingwith it.
Meth isn't that high of octane.. its only like 107-108 iirc.. and mixed you're only have ~ 100.. Thats not enough octane for 29 psi imo.. Should be good up to ~ 22-24 psi on the 70 i'd imagine.. ~ 600whp
I wouldn't worry about the water anyways.. It wont help with detonation, the extra octane would though... I say redyno on ~ 22-24 psi and see what kind of numbers you get. I bet you could run a lot more timing and make better numbers..
What kind of timing where you running @ 29 psi?
I wouldn't worry about the water anyways.. It wont help with detonation, the extra octane would though... I say redyno on ~ 22-24 psi and see what kind of numbers you get. I bet you could run a lot more timing and make better numbers..
What kind of timing where you running @ 29 psi?
I read on the scooby forums that meth was 129 octane?
Also with a 50/50 mix with 93 octane (using the appropriate nozzle size per calculator) snow performane techs was claiming 116 octane on their forum.. that one I'm not buying..
Also with a 50/50 mix with 93 octane (using the appropriate nozzle size per calculator) snow performane techs was claiming 116 octane on their forum.. that one I'm not buying..
I dont think methanol is that high.. Its low 100s.. I think ethanol is 120-130.. I could be wrong though..
yea, I googled it and can't find anything on it..
I don't know what the problem is. I really don't think it's cams, my timing is conservative but I upped it considerably on the dyno (I'll definately post my timing when I get back home).
I'm starting to think maybe the 3mm HG was way too much of a drop on compression maybe??
I don't know what the problem is. I really don't think it's cams, my timing is conservative but I upped it considerably on the dyno (I'll definately post my timing when I get back home).
I'm starting to think maybe the 3mm HG was way too much of a drop on compression maybe??
the 8:1 wouldn't make THAT much difference. Maybe next time on the dyno try to tune up 16-18 psi on 93 and see what you can get.. then try the meth after you get the straight 93 running as it should.
looking at other dyno graphs I feel like now that I fixed the boost falling off problem.. I'm making my peak HP and torque at the same place as other cars making 600+ RWHP. I'm gonna hold off a little while on dynoing again, at least until it's cooler outside. 97* temps can't help #'s.
I may have missed it, but how much did your boost drop off from 29psi?
Also, I would reccomend using some good race gas next time at the dyno, then later on dyno with the methenal. Race gas would be a more fool proof way of running high boost at least until you get things sorted out.
Also, I would reccomend using some good race gas next time at the dyno, then later on dyno with the methenal. Race gas would be a more fool proof way of running high boost at least until you get things sorted out.
I agree, next time I'll definately run some race gas considering it's looking like Meth is not 129 octane as I thought. The extra insurance can't hurt.
I wasn't in the car when the tech did the pulls, and unfortunately I didn't realize my boost was dropping off until the middle of the last pull. On the street I've seen the boost drop off as much as 6 PSI (running 25psi). I have no idea what it was doing at 29 as I've never run that much boost on it before.. I decided I was NOT going to leave the dyno without breaking 500WHP.
I wasn't in the car when the tech did the pulls, and unfortunately I didn't realize my boost was dropping off until the middle of the last pull. On the street I've seen the boost drop off as much as 6 PSI (running 25psi). I have no idea what it was doing at 29 as I've never run that much boost on it before.. I decided I was NOT going to leave the dyno without breaking 500WHP.
tissimo said:
http://www.msnbc.msn.com/id/12740848/Found this about the octane ratings on an article about Indy...
Cars running on ethanol certainly pack a powerful punch. Pure ethanol — made from renewable plant sources like corn, wheat and sugarcane — has an octane rating of 113, compared with 107 for methanol and about 91 to 95 for gasoline. Several track records already have been set this season using the new fuel blend. In general the higher a fuel’s octane rating, the better the engine will perform.
Article, 7 paragraphs down.
I think that 500+ is great for the first dyno pull!!!! Thats over double the HP of this motor stock and its holding up great. How does it run on the street? Does the compression make it laggy? Is there much power in 1st/2nd gear? I have a good feeling youll be close to 600 the next dyno.
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