[jessrayo]

Originally Posted by JANNETTYRACING

I am curious where your blow off valve is in relation to the MAF.

A MAF should always be After any blow off valves.

Or when it is open the maf is seeing air flow that is not entering the engine and fueling will follow making a very rich condition.

Ted.

Hmmm, I don't know where the blow off is but I'm pretty sure it is after the intercooler. When I lift after a full throttle burst I can sometimes see a little white cloud come out of the hood vents that I assumed was the methanol coming out the blow off and the hood vent. I do have more black soot on the exhaust tips than I considered normal but attributed that to the removal of the cats.

I always say I'm the driver and not the mechanic but try to stay pretty well informed on what is going on. I'm kind of thinking that these direct injection motors would have to respond more to throttle position than air flow because they are more well... direct but I really don't know for sure.

Is there a way to work around that in the tune?

[JANNETTYRACING]

Originally Posted by jessrayo

Hmmm, I don't know where the blow off is but I'm pretty sure it is after the intercooler. When I lift after a full throttle burst I can sometimes see a little white cloud come out of the hood vents that I assumed was the methanol coming out the blow off and the hood vent. I do have more black soot on the exhaust tips than I considered normal but attributed that to the removal of the cats.

I always say I'm the driver and not the mechanic but try to stay pretty well informed on what is going on. I'm kind of thinking that these direct injection motors would have to respond more to throttle position than air flow because they are more well... direct but I really don't know for sure.

Is there a way to work around that in the tune?

The only work around is Speed density Only tuning.

The bypass valve should be before the intercooler, then the MAF should be after the intercooler and the Meth injection should be after the MAF.

The further you move the MAF from the engine the more lag in signal.

Remember Air flows like a Slinky, you move the Throttle then the MAF sees the change in air flow, then the computer changes the injector on time and spark values.

The further it is the more the time delta.

Ted.

[jessrayo]

Originally Posted by JANNETTYRACING

The only work around is Speed density Only tuning.

The bypass valve should be before the intercooler, then the MAF should be after the intercooler and the Meth injection should be after the MAF.

The further you move the MAF from the engine the more lag in signal.

Remember Air flows like a Slinky, you move the Throttle then the MAF sees the change in air flow, then the computer changes the injector on time and spark values.

The further it is the more the time delta.

Ted.

Well I found out the blow-off on Borg Warner EFR's is right on the turbo so you don't get much closer than that. It is probably the most responsive turbo system I have ever driven.

[cleoent]

The videos aren't loading for me.

[jessrayo]

Originally Posted by cleoent

The videos aren't loading for me.

Its just photos, no video.

[JANNETTYRACING]

Originally Posted by jessrayo

Well I found out the blow-off on Borg Warner EFR's is right on the turbo so you don't get much closer than that. It is probably the most responsive turbo system I have ever driven.

Good Stuff.

I would still like to see the MAF after the intercooler and closer to the TB.

This way the MAf is in the right size pipe, and sees actual charge temps entering the TB.

Ted.

[jessrayo]

Originally Posted by JANNETTYRACING

Good Stuff.

I would still like to see the MAF after the intercooler and closer to the TB.

This way the MAf is in the right size pipe, and sees actual charge temps entering the TB.

Ted.

There is a different intake air temp sensor just before the throttle body so it is reading accurate temps after intercooler and meth, just have the MAF before the meth. I guess injecting the meth into the intercooler keeps it more evenly dispersed throughout the air, may allow more methanol use. The dyno numbers here are with 91 octane pump gas and methanol.

This is the first methanol system I have had in a daily driver and I think it only starts to spray above 6 psi of boost but if I'm moving fast it will empty the one gallon of meth before I go through a tank of gas. Haven't put the car on the road course but I know there it will use all the meth probably with a half a tank of gas....it definitely is a meth addict. So far in the 5000 miles I've driven the car with turbos on it I've used about 12 gallons of meth. Its fine if I stay in town but if I put the car on the open road I have to fill the meth tank when I come home. One full throttle burst over 175mph will use about 1/3 of a gallon. I can't argue with the results though.... it will get up and run.

[JANNETTYRACING]

Originally Posted by jessrayo

There is a different intake air temp sensor just before the throttle body so it is reading accurate temps after intercooler and meth, just have the MAF before the meth. I guess injecting the meth into the intercooler keeps it more evenly dispersed throughout the air, may allow more methanol use. The dyno numbers here are with 91 octane pump gas and methanol.

This is the first methanol system I have had in a daily driver and I think it only starts to spray above 6 psi of boost but if I'm moving fast it will empty the one gallon of meth before I go through a tank of gas. Haven't put the car on the road course but I know there it will use all the meth probably with a half a tank of gas....it definitely is a meth addict. So far in the 5000 miles I've driven the car with turbos on it I've used about 12 gallons of meth. Its fine if I stay in town but if I put the car on the open road I have to fill the meth tank when I come home. One full throttle burst over 175mph will use about 1/3 of a gallon. I can't argue with the results though.... it will get up and run.

Again I am not here to debate or say there is anything wrong with the way it is done.

It obviously works well.

I am just sharing technical info that may be helpful.

Ted.

[jessrayo]

Originally Posted by JANNETTYRACING

Again I am not here to debate or say there is anything wrong with the way it is done.

It obviously works well.

I am just sharing technical info that may be helpful.

Ted.

It's all good, if I didn't have your comments I wouldn't know what to ask the builder....lol. I'm constantly learning more about all this stuff and just about the time I think I've got it kind of figured out GM comes up with a new engine....

[Joe@CPR.com]

I agree on the placement of things on the kit. The tuner who did his car even expressed those concerns to AGP.

[parish8]

was meth installed for those dyno runs or after?

9psi for 550hp? something seems off to me with that.

[AGP Turbo]

These were some earlier leaning experiences with a different dyno and different tuner that left us with a number of problems that he couldn't remedy. He was commanding 13.5:1 at WOT
We took it to a better tuner who had no problem clearing everything up and getting the tune right and safe.

[JANNETTYRACING]

Originally Posted by AGP Turbo

These were some earlier leaning experiences with a different dyno and different tuner that left us with a number of problems that he couldn't remedy. He was commanding 13.5:1 at WOT
We took it to a better tuner who had no problem clearing everything up and getting the tune right and safe.

Well, if you read the Internet, your suppose to run DI motors at 13.5:1 with boost

[parish8]

Since it has been brought up what is a good target a/f or lambda? I always went 11.5-11.8 on the ls stuff.