Cams & Other stuff..

[ttrank]

How much power can the larger MAF handle? I would love to have the stock ECU deal with it all. My UTEC 91oct daily driver tune is ~530whp and race gas is 650.

[TTG35forT]

Originally Posted by ttrank

How much power can the larger MAF handle? I would love to have the stock ECU deal with it all. My UTEC 91oct daily driver tune is ~530whp and race gas is 650.

The published data says that it is good to 1000 hp, though I don't know if anyone has pushed it that high. I asked Sam about it one time, and I think he has used it to tune a car in the 600+ hp range.

I was even thinking about using that MAF sensor with my F-CON in lieu of the MAP sensor. Sam did say that he did that once, but the tune took a very long time. Although the F-CON can use a MAF sensor, it is mainly geared around a MAP sensor and using a MAF sensor is not straight forward. With the Osiris, however, it should be fine because the stock ECU is configured for a MAF sensor.

[Canadian]

Found out today that my car has quite a lot of blue smoke coming out the rear, not good. A build may be sooner than I thought

[urban]

Ahhh crap, I hate forced upgrades

[seymore4]

Originally Posted by Canadian

Found out today that my car has quite a lot of blue smoke coming out the rear, not good. A build may be sooner than I thought

I feel your pain

[djamps]

Originally Posted by TTG35forT

You may want to think about a Motordyne 5/16", AAM 5/16" or other equivalent pleum spacer. That will certainly make getting hp easier.

Ceramic coating the exhaust manifolds, turbine housings and downpipes will help keep your engine bay significantly cooler. (It will also very slightly improve turbo spoolup, but the improvement probably won't be noticable).

You should probably get 1 step colder spark plugs.

I would also suggest an oil cooler.

I saw zero HP difference after adding a spacer with FI, and in fact I lost a few lbs of tq although it could have been the weather. It's my measured experience that the spacer really only helps with NA tuning. In FI, it doesn't do squat. If you want to mess with the plenum you'll need a whole new one to make any significant difference.

[silver g]

Originally Posted by ttrank

How much power can the larger MAF handle? I would love to have the stock ECU deal with it all. My UTEC 91oct daily driver tune is ~530whp and race gas is 650.

Im on a stock ECU tuned by Technosquare with stock MAF and I am at 550WHP on 91 Octane. With Race Gas it would be well over 600whp with no issues. So yes it can be done...no need to run a larger MAF...Technosquare has a way around that.

[djamps]

Stock MAF maxes out by 6psi ~4000 rpm. If they tune to your WHP on that, then they are basing the entire >6psi boost portion of the tune on a single column...possible, yes...something I would do to my car? no... I'm guessing you have a RFS, because without one there's no way you could tune that kind of whp with a maxed out MAF and no MAP sensor.

[silver g]

Originally Posted by djamps

Stock MAF maxes out by 6psi ~4000 rpm. If they tune to your WHP on that, then they are basing the entire >6psi boost portion of the tune on a single column...possible, yes...something I would do to my car? no... I'm guessing you have a RFS, because without one there's no way you could tune that kind of whp with a maxed out MAF and no MAP sensor.

Tadashi at Technosquare does something to increase the resolution of the stock MAF sensor...he will not say what though...his own secret. Cheston from my350Z and Rookie from here are running similar tunes by Technosquare pushing equal or more WHP than Iam on stock ECU. Yes I have a complete fuel return system. Car drives like stock with ALOT more power...3000+ miles on this tune and no problems whatsoever.

[TTG35forT]

Originally Posted by djamps

I saw zero HP difference after adding a spacer with FI, and in fact I lost a few lbs of tq although it could have been the weather. It's my measured experience that the spacer really only helps with NA tuning. In FI, it doesn't do squat. If you want to mess with the plenum you'll need a whole new one to make any significant difference.

Perhaps. I started with a 5/16" spacer based on recommendations from the forums, so I can't provide a comparison to the stock plenum spacer. From there, I switched to the Cosworth intake plenum. There I saw a very noticable difference. I'm still not sure it is worth the money, but it definitely does help.

[djamps]

Originally Posted by TTG35forT

Perhaps. I started with a 5/16" spacer based on recommendations from the forums, so I can't provide a comparison to the stock plenum spacer. From there, I switched to the Cosworth intake plenum. There I saw a very noticable difference. I'm still not sure it is worth the money, but it definitely does help.

After going FI, I have before and after dyno charts with and without the spacer. With the spacer, peak HP was exactly the same, but peak tq was 9 ft/lbs less. The lack of torque could have been attributed to the weather (the runs were about 2 weeks apart but within a few degrees F.) but the difference is certainly negligible and not looking favorable.

N/A there is obvious proof of gain from a spacer in charts I've seen. It seems that gain is insignificant in F/I unless you're doing BIG HP and in that case you need a Cosworth.