fast951

1000 kg/h is very close to the factory AFM. Is it enough? It depends on how much HP are you making.. Many factors must be taken into calculating the kg/hr vs. hp potential. As a rough estimate, 1000kg/hr will support approx 320-340bhp. before it maxes out..
In your case, you can measure the MAF voltage under load to see if you are hitting 5V.

333pg333

Sounds like John is onto something here. By the list of mods on this car I'm sure that 320bhp is being exceeded. Well spotted John.

Rogue_Ant

Interesting... We didn't see any signs of cylinder movement on Sid's car after 35psi runs. Though this wasn't extended time in boost (unlike yours), the cylinder pressure was certainly higher (assuming similar timing advance).

333pg333

We are definitely seeing this on a repeated basis. On more than one car too. My best 'guess' is that our timing isn't overly aggressive based on John wanting the motor to last longer than a few laps.
I'm not sure if Sean has any pics of the headgaskets? I might at home. If I do, I'll post them.

Corleone

Yes head lift can occur but the first thing that happen is the steambuilding thing.

The vibration is also a problem like you say, especially at the 2,5. That I could see at my old 2.5 vid MLS. The theory is that is come with higher revs. A 3 liter is better and a Darton sleeved best so far to prevent this.

You all should glue the headgasket no matter what gasket you need. It will prevent small water molecules to come between and that then is make the gasket locally lift. I use Loctite on spray. Maybe it helps to fixate the gasket some to and prevent extra movement.

Corleone

Yes, its the only easy solution this far.

About tuning (ign) issues... of course when you lower ignition you also lower the power, the difference is huge. Lower ign>less heat>less hotspots>less problems>boaring car...

gt37vgt

whats the opinion on copper head gaskets with oring compared to MLS ???
coper sort of requires o ringing but as coper is ultra thermo conductive it would perhaps equialise the temp between the top of the bore and the head ...

Thom

Have you guys who have now run E85 for a long time noticed any unwanted side effects such as corrosion of fuel lines?
Are there any particular parts in the (stock) fuel delivery system that may need checking before filling up with E85 for the first time?

DLS

hm that sounds no good

i must look into this

Corleone

I always use Redline additive for alcohol fuels. No problems if this is used.

Corleone

Didnt you have a larger MAF tube from Tomas? If you have a MAF with larger diameter you can measure more air before you reach 5V.

toddk911

All on the street:

I've been running 18psi for over 6 years and never an issue. The only problem I had was highway runs (4th/5th gear) in the winter a while back and was boost creep due to cold to about 20psi and the only problem was injectors were maxed so it went very lean and hg went.

I ran 20psi for about 6 months and never an issue till a run with a crotch rocket and was deep in 4th gear and had some head lift, but no hg failure. Rogue says prob due to, as mentioned in here, too much advance in the peak tq range which is in need of adjusting.

So now I dialed back to 18 again and no issues.

DLS

I have tomas maf tube modified with 3" inlet pipe to turbo.
I have sent pm to Tomas but no answer yet.

DLS

And you run on E85?

toddk911

No, 93.

I pray every day to get E85!!! lol

if on E85, I would be running 22-25psi like most are that run it.