Turbo folks: Have some AFR questions

[FoxBodyNick]

Turbo. Wldnt he want to be a little fat incase something happens with the meth injection?

[turbos66coupe]

I would say no. That's like having car insurance just to insure your primary insurance is good. Kind of overboard. There are other checks and balances like knock sensors etc to cover detonation. The fact is sometimes things fail that's the chance you take. And since I don't see his car having any trouble achieving his goals he shouldn't need it at all. Cobras use it a lot because they tiny after coolers that heat soak easy with pulleyed/tuned set ups. And the subaru guys live buy it again because their intercooler set on top of the motor and heat soaks. But a goodfront mount for a street car should be fine. I'm not saying it will hurt I just don't see the waste of time,money,maintanance etc but since he already has it might as well see what it does. I may stick my foot in my mouth who knows.

[FoxBodyNick]

gotcha.

[turbostang]

I would be PISSED if that was my car and it didn't run low 9's. The only thing holding you back at this point is not having a transbrake.

[Sam88gta1]

Shoot for 11.8:1 af throughout the entire rpm range. It does not need to be richer at peak tq. Also timing is not to be pulled back at peak tq like an N/A application. I still think you either need to ditch the meth idea or buy a quality system. Simply pulling timing away at higher IAT's will not save your motor in the event of a meth failure. Do not run 15lbs on that stock motor with pump gas. It will not live long. You also should stop comparing your combo to what that s10 does.

Please for the love of god stop asking the same questions over and over on multiple forums.

[FRANCISCO308]

Shoot for 11.8:1 af throughout the entire rpm range. It does not need to be richer at peak tq. Also timing is not to be pulled back at peak tq like an N/A application. I still think you either need to ditch the meth idea or buy a quality system. Simply pulling timing away at higher IAT's will not save your motor in the event of a meth failure. Do not run 15lbs on that stock motor with pump gas. It will not live long. You also should stop comparing your combo to what that s10 does.

Please for the love of god stop asking the same questions over and over on multiple forums.

lmfao

[dville_gt]

Thanks Sam, I went ahead and started tuning the VE table aiming for 11.50 across the board before I saw your response. Car feels real good now. I think for the time being I'll leave it where it's at until I can get it on the dyno.

[Outlaw88]

I agree 100%, my car we run around 11.7 at most boost levels 6-28lbs. I do not see the reasoning of adding a another fuel to the equation of tuning. C16 and let it rock anytime of the year...

You're missing the point of the question - What are you looking for 15psi to do exactly? What if 15 psi doesn't do what you expected?

In other words, don't settle on a boost number, but rather a power level or an ET.

I don't think there's any leniency at all, if anything it will add a new level of difficulty to something you're already unfamiliar with.

I don't know that the IAT vs. timing is fast acting enough to be able to catch the meth failure.. I'd think you'd have to drop the timing much sooner than you 'wanted' to - which would probably end up in your 'normal' running conditions.

All in all, i'm not a fan of adding complexity where it's not needed

[Lason]

LOL@$10/gallon fuel in a street car with A/C.

If you got a trailor queen then sure, go for C16. Anything else then pump or E85. I understand your reasoning for shying away from E85 though so I would stick with 93 and watch those IAT's and temps and go as far as that will take you.

[dville_gt]

LOL@$10/gallon fuel in a street car with A/C.

If you got a trailor queen then sure, go for C16. Anything else then pump or E85. I understand your reasoning for shying away from E85 though so I would stick with 93 and watch those IAT's and temps and go as far as that will take you.

Exactly, and it's easy to keep these IAT's in check when its 40-50* outside, but come summer time I think the meth or alcohol injection will be needed, I can't run any exotic fuel (I drive it too much) and e85 isn't reasonable either.

[Outlaw88]

You are correct mine travels by trailer most
The time but I throw 93 in it and can drive
To car shiws

LOL@$10/gallon fuel in a street car with A/C.

If you got a trailor queen then sure, go for C16. Anything else then pump or E85. I understand your reasoning for shying away from E85 though so I would stick with 93 and watch those IAT's and temps and go as far as that will take you.

[Dan03mach]

Okay, I see what you are asking now. Based on a very similar combo (lq9/t6 s475 @ 15psi) there is an s10 truck that is doing bottom 10's. I'd really like this car to go 9's so I figure my coupe will probably be pretty close to that @ 15psi. Granted the s10 isn't running meth injection and is using the more restrictive truck intake, so possibly I can pull those goals off without the meth injection at all.

Dude that that car doesn't run 9's at 15lbs I'd push it off a clift. My old Turbonetics 76mm ran a 9.96 with a big ass hold in the charge pipe coupler at around 14lbs and I know your turbo moves a hell of a lot more air then that T76 I had did.

[turbostang]

Exactly, and it's easy to keep these IAT's in check when its 40-50* outside, but come summer time I think the meth or alcohol injection will be needed, I can't run any exotic fuel (I drive it too much) and e85 isn't reasonable either.

You don't run race gas 24/7. You only run race gas... Wait for it... When you race!!

You can run 93 for most of what you want to do. I'd put 5 gallons of 93 in my car and drive it to the track.. Then get a couple gallons of C16.. Make 6 passes or so, and drive home with plenty to spare.

You most likely can't turn it up enough on the street to necessitate anything other than 93 for up to around 9lbs of boost, why complicate it?

[Dan03mach]

You don't run race gas 24/7. You only run race gas... Wait for it... When you race!!

You can run 93 for most of what you want to do. I'd put 5 gallons of 93 in my car and drive it to the track.. Then get a couple gallons of C16.. Make 6 passes or so, and drive home with plenty to spare.

You most likely can't turn it up enough on the street to necessitate anything other than 93 for up to around 9lbs of boost, why complicate it?

Now that sounds like a great idea...

[Sam88gta1]

Thanks Sam, I went ahead and started tuning the VE table aiming for 11.50 across the board before I saw your response. Car feels real good now. I think for the time being I'll leave it where it's at until I can get it on the dyno.

Going from 11.5:1 to 11.8:1 is not going to show a power increase. Don't put the car on the dyno for the final tune. Tune it on the street where the load is actual. It will make the most amount of power with the most amount of timing you are willing to run. It will pre ignite with 20 degrees and make awesome power but obliviously will not live like that. At 9lbs of boost you will be in the area of 14 degrees of total timing at peak boost and peak rpm with straight 93 octane. Any more will significantly shorten the life of the motor. Don't turn a lot of rpm at that power level. Max rpm of 6500 is plenty and it will live a long life.

Double and triple check your wideband offset on a regular basis.