tune(smaller pullie , methanol )

[striker 5]

I have a dyno tune on a whipple HO it making 9psi , auto, stock bottom end . The pullie size is 3.375 going to 3.25 I add a alky methanol kit that comes on at 4psi and increases as boost come in . I have this for safety . Talked to tuner and they said to install pullie and use the methanol I'm take it in for a retune but not until july he's booked . So my question is will I be safe like this untill I get to the tuner or just run the car with the 3.75 and turn off the meth for now .

 

[rayS197]

I would wait. It doesnt take that long to swap out pullies.

 

[BruceH]

I have a dyno tune on a whipple HO it making 9psi , auto, stock bottom end . The pullie size is 3.375 going to 3.25 I add a alky methanol kit that comes on at 4psi and increases as boost come in . I have this for safety . Talked to tuner and they said to install pullie and use the methanol I'm take it in for a retune but not until july he's booked . So my question is will I be safe like this untill I get to the tuner or just run the car with the 3.75 and turn off the meth for now .

As long as the maf xfer function is properly tuned there will be no problem changing pullies. The maf will see the extra air coming in and the correct amount of fuel will be used to maintain the commanded lambda.

Methanol will lower your hp, cool the air charge, and raise the knock threshold but that's about it. Tuning for methanol is a risky proposition imo. It is a fuel and allows more spark advance to be used. However, imo it's not a good idea to mess with the commanded fuel to account for the meth. More spark can be added with meth and it's the only way to get the hp back that's lost with meth injection. However, at that point you are dependent on the meth, without it the motor will go.

 

[striker 5]

plans are to not tune for meth but as a safety net I know about the power loss that's fine when I take it back for a retune tring for 500 to the wheel . thank's for all the input .

 

[Steedman07]

As long as the maf xfer function is properly tuned there will be no problem changing pullies. The maf will see the extra air coming in and the correct amount of fuel will be used to maintain the commanded lambda.

Methanol will lower your hp, cool the air charge, and raise the knock threshold but that's about it. Tuning for methanol is a risky proposition imo. It is a fuel and allows more spark advance to be used. However, imo it's not a good idea to mess with the commanded fuel to account for the meth. More spark can be added with meth and it's the only way to get the hp back that's lost with meth injection. However, at that point you are dependent on the meth, without it the motor will go.

I disagree. There is nothing wrong with running meth and tuning for it to make power. IMO, as long as you have an early warning of flow stoppage and a tuner who knows how to tune with meth..

I have been running meth for a few years, and no other form of cooling. My car runs fine at 12 lbs. of boost, stock bottom end and traps @ 122 mph..

 

[striker 5]

The shop is alternative performance the kit is a progressive kit and it dose have all the safe guards on it , low level , boost light when on and one on the adjustment box. I was just playing it safe that's all .

 

[Steedman07]

The shop is alternative performance the kit is a progressive kit and it dose have all the safe guards on it , low level , boost light when on and one on the adjustment box. I was just playing it safe that's all .

I think if your tuner is good, then why not tune for it and make a little more power? Mine comes on too at 4 psi, but I have a centry. Depending on your power curve, and if you daily drive it, you may want it to start spraying later, at 6 psi maybe.

 

[hamish]

I've questioned this in the past about ranging the Maf sensor in the tune.

Maybe Bruce can send me the link of the tuning book I should have bought awhile back.lol

I'm not sure if this applies to our cars but in my field of work we range our sensors to the usable range of the process.
Which means if we know we are going to use (X)amount of air and our signal range is say 5v, we would calibrate the 5v to represent that (x)amount of air or a little above it.
If we were to increase our available air significantly then we would max out our 5v signal early, before the new max (y)air was achieved, thus pegging the sensor and having an uncontrollable process above the original (x)amount.
This is all speculation ofcourse and may not pertain to our cars, but clarification with your tuner would be wise.

 

[Riptide]

Ancillary question but if you are spraying water only must you adjust the tune for it?


Sent from my iPhone using Tapatwat

 

[BruceH]

I disagree. There is nothing wrong with running meth and tuning for it to make power. IMO, as long as you have an early warning of flow stoppage and a tuner who knows how to tune with meth..

I have been running meth for a few years, and no other form of cooling. My car runs fine at 12 lbs. of boost, stock bottom end and traps @ 122 mph..

Correct me if I have this wrong. You are mostly using it for cooling so that you can run more boost without an intercooler. Is that correct? If it goes out your iats will climb, knock sensors and/or failsafes take over and it's all good. A fairly safe setup imo.

Tuning for it involves adding spark and taking away lambda in the commanded fuel to compensate for the extra fuel and octane provided by the meth/water mixture. IMO it's far more dangerous than just using it for cooling purposes.

I've ran it to substitute for an intercooler before and decided not to tune for it. All it would take is an air bubble or even a slight bobble to suddenly not have enough fuel or spark protection to prevent detonation and I don't think there is a failsafe that will protect the motor fast enough in that situation. I've had a friend lose his motor when there was just a slight bobble. Pistons melted, etc. It didn't take much.

 

[rayS197]

Are you planning on tracking the car? I'm not seeing why the meth if so?

 

[striker 5]

the car is just a weekend toy car shows and clubs . I take it to the track just to see the times or what it can run . A friend of mine has a grand national he has the same meth kit and runs 30lb of boost with it and it is tuned for it and the motor is forged . not looking for oet of this world numbers just looking for a little safety . My thinking is if I tune for say 500 to the wheels and use the meth I can get a solid 480 and have low temps so I'm at this power level all the time with no heat soak . I'm not a pro a tuning just thought I''d try it for a while .

 

[BruceH]

the car is just a weekend toy car shows and clubs . I take it to the track just to see the times or what it can run . A friend of mine has a grand national he has the same meth kit and runs 30lb of boost with it and it is tuned for it and the motor is forged . not looking for oet of this world numbers just looking for a little safety . My thinking is if I tune for say 500 to the wheels and use the meth I can get a solid 480 and have low temps so I'm at this power level all the time with no heat soak . I'm not a pro a tuning just thought I''d try it for a while .

It works excellent as insurance against heat and detonation. I watched my iats go from 140 to 8x with a non intercooled whipple at wot. Like Steedman said you can control when the meth comes on. A positive displacement blower should be set up on maf voltage. Start it where you want and ramp to full spray as you want. IIRC Alternative Auto is Lidio and they have a lot of experience with meth. Most of the research I did prior to using it came from things they had done and posted about.

 

[striker 5]

I was there friday and talked to him . I have he's tune now in the car taking the car back to him for the retune . I was at the track and seen his 4.6l auto car run into the 10s with this set up he has a 5.0 now with a roush tvs blower auto . I just waited to long had no time to get the car ready so I have to wait for a opening or july he may be able to sneek me in .

 

[05stroker]

Also if you are using it for cooling only use a 30% meth and 70% water, not the 50/50 stuff. It will make the car run to rich while spraying.

 

[Steedman07]

Correct me if I have this wrong. You are mostly using it for cooling so that you can run more boost without an intercooler. Is that correct? If it goes out your iats will climb, knock sensors and/or failsafes take over and it's all good. A fairly safe setup imo.

Tuning for it involves adding spark and taking away lambda in the commanded fuel to compensate for the extra fuel and octane provided by the meth/water mixture. IMO it's far more dangerous than just using it for cooling purposes.

I've ran it to substitute for an intercooler before and decided not to tune for it. All it would take is an air bubble or even a slight bobble to suddenly not have enough fuel or spark protection to prevent detonation and I don't think there is a failsafe that will protect the motor fast enough in that situation. I've had a friend lose his motor when there was just a slight bobble. Pistons melted, etc. It didn't take much.

Ya, its main purpose for me was for IAT's..If I am at WOT at full boost and something happens with the meth and it stops flowing, I better notice my flow gauge and let off. Or I will blow it up as the tune is dependent on the meth flowing..

 

[striker 5]

After talking and thinking about this why have this kit on if I'am not using it so I'm going to tune for methanol I know lidio at alternative ran it for 2yr . when I get it done I'll post up the numbers .

 

[BruceH]

Still on the stock block? If so how far will you take it?

 

[striker 5]

Yes stock block not over 500 to the rear . The car is an auto , so if I can get that I would say brave enough for me . Do you think it's about wright .

 

[rayS197]

After talking and thinking about this why have this kit on if I'am not using it so I'm going to tune for methanol I know lidio at alternative ran it for 2yr . when I get it done I'll post up the numbers .

looking for that 10 second slip for you to post!!