I added a FAST 90/90 combo over the winter to my datsun and last week dropped 3tenths and gained 7mph with stock heads and a 224/224 cam while running the same tune as I had while running my LS6 intake. HUGE improvement IMO. Well worth it. I haven't dyno'd since fwiw.

 

12.6 @109 is the impoved 7 mph time?????

 

12.31 @116.9 is the new time with a 2.0 60'

 

Just to keep things up to date ran 11.77 @119.97 so thats almost .9 ET drop
best part is the 1.77 60' on street DR's

 

is a dremel and some 120 grit sanding drums good for initial clean up of a fast intake?and is the holly 90mm tb any good?

 

Agreed

 

dremel and sandpaper is all i used.


while i see what you guys mean about the MAF being smaller than the TB.....i still picked up good power. not all the gains are from the bigger TB.

HOWEVER some of it IS...since those modified ls6 intakes (with the 90mm snout and TB) show gains.

 

Okay, now I have another question that came up in this thread.

After reading some of the replies I realized I forgot one part..... I still have the stock mass airflow sensor on my car. How much will this hurt me if I don't do the 85mm? One other question, on SLP's website it says the 85mm mass airflow is for stock tune, why?

Thanks,

 

i didn't change my MAF....other than having ported ends that have been on it for 6yrs....and i still got great gains.

even if you change the MAF, the opening on most lids is only 75mm or so.

the aftermarket mafs are calibrated to run on stock tuning. and even then, they aren't done well since every car is a little different.


if you really want to take full advantage of the bigger TB/intake, you'll need a bigger lid (several places make 100mm lids) and a Truck MAF. then take it to a GOOD tuner who can upload the right calibration tables for the new MAF, and tune the car for everything.


i plan to do a dyno comparison on my next big upgrade. i plan heads soon, and i'll also get the bigger lid and MAF. plan to do the head swap, tune it, then throw the lid/maf on it and re-tune. see what the gains are.

 

Wouldn't it make sense to keep everything the same size. What's the point of a 92mm TB/FAST opening when it's going through a 85mm MAF or a smaller stock MAF and a smaller lid? Wouldn't you want a 98mm Lid and 100mm MAF so not to limit the 92mm TB/FAST?