[Ian SS]

Originally Posted by TSloper

If you can guarantee the ethanol percentage will be constant with your source of E85 you can just drain and fill. The tune will be straight forward.

E85 can be as low as 51% so without the sensor it is a crap shoot if you use different sources.

Pumps locally are 70% minimum gauranteed! Thank goodness.

[TSloper]

You're lucky!

[jdasnt3]

No tune required for us. We had a tune and PTB prior to the CAI brand installation. 400ish stock, 420 tuned with PTB. Datalogged by our tuner on the street under a 45 minute drive and he mentioned that it didn't appear to need any further adjustments. He did not require another tune.

[LibertyHill]

Originally Posted by jdasnt3

No tune required for us. We had a tune and PTB prior to the CAI brand installation. 400ish stock, 420 tuned with PTB. Datalogged by our tuner on the street under a 45 minute drive and he mentioned that it didn't appear to need any further adjustments. He did not require another tune.

Which leads me to believe a CAI alone doesn't require a tune either. What would be the difference between installing a CAI and driving from Denver to Houston? Either way the engine is getting more air and the ECU allows for additional performance.

[ender2664]

Originally Posted by slo_1ss

On the type of dyno i was on, a stock ss puts down 385-395. I made 406 with the CAI and MSD intake installed with no tune. After the tune I made 422.

So intake and intake manifold on stock tune you picked up about it 10-20hp for about 1,500? And with the tune 25-35? That seems like a lot of cash for not a lot of hp.
Would you say it was only good bang for the buck because you went with e85?
Cause 20 hp for 1500 is a rip IMO but 50hp is a whole different story!

[Ian SS]

Originally Posted by ender2664

So intake and intake manifold on stock tune you picked up about it 10-20hp for about 1,500? And with the tune 25-35? That seems like a lot of cash for not a lot of hp.
Would you say it was only good bang for the buck because you went with e85?
Cause 20 hp for 1500 is a rip IMO but 50hp is a whole different story!

The intake manifold will typically not make any extra power until you tune it. A tune will really squeeze the ponies out of it. And this is a mod that will really show more gains if I go procharger/nitrous later.

[ender2664]

Originally Posted by slo_1ss

The intake manifold will typically not make any extra power until you tune it. A tune will really squeeze the ponies out of it. And this is a mod that will really show more gains if I go procharger/nitrous later.

I'm back and forth on FI; it is really expensive and voids my warantee:(
If I could use nitrous here I'd already have it.

No E85 around here so I cannot follow in your footsteps.

[TSloper]

Originally Posted by LibertyHill

Which leads me to believe a CAI alone doesn't require a tune either. What would be the difference between installing a CAI and driving from Denver to Houston? Either way the engine is getting more air and the ECU allows for additional performance.

Here is the difference... driving from Denver to Houston you have a calibrated MAF transfer function. The MAF measures air mass so if the transfer function is correct it will adapt from sea level to high altitude. That is THE benefit of a MAF.

The MAF transfer function is calibrated to the factory intake flow characteristics. If the intake flow characteristics change your tune will be off. Unless you recalibrate the transfer function you don't know what you have as far as accuracy on tune. The CAI manufacturers are using the fuel trim boundaries to keep out of trouble. Just because you don't get a CEL doesn't mean your tune is optimal or you are flowing more air.

[LibertyHill]

Originally Posted by TSloper

Here is the difference... driving from Denver to Houston you have a calibrated MAF transfer function. The MAF measures air mass so if the transfer function is correct it will adapt from sea level to high altitude. That is THE benefit of a MAF.

The MAF transfer function is calibrated to the factory intake flow characteristics. If the intake flow characteristics change your tune will be off. Unless you recalibrate the transfer function you don't know what you have as far as accuracy on tune. The CAI manufacturers are using the fuel trim boundaries to keep out of trouble. Just because you don't get a CEL doesn't mean your tune is optimal or you are flowing more air.

THANK YOU! I love learning new stuff:

http://www.cnlperformance.com/MAF_info.php?section=14