WICKEDOWESIX

iTrader: (2)

Try running it without the filter to see of that changes anything. 4" cai pipe might be in order.

What did you you end up putting down?

zero2sixT

iTrader: (4)

It runs good now. Just stops pulling hard around 115+ mph.

It only put down 408/408 in 3rd. I was looking for 450+. It put down 404/391 before the heads. And that was in second. Sick to say the least. I didn't even get the print out. But that doesn't tell the whole story.

I went home and started messing with it. Found the transmission dipstick wasn't reading a level. It was a quart and a half low. We added a tru cool 40k and a 34" radiator. Somehow adding ATF got overlooked.

I'm going to get the air intake sorted out and then re-dyno.

I have a question tho. How many of y'all are still running the stock maf sensor? TSP has a 100mm maf kit for $230. Just wondering if I need that or not. I agree with 03sierra, no point in going 4" pipe with a 3" swedge in the line. I thinking maybe just a better flowing filter is all it needs.

WICKEDOWESIX

iTrader: (2)

You will be fine with the stock maf. I still run it and I am heads cam 370. Your numbers seem a little low although numbers aint **** is a good baseline. My combo put down 444rwhp/410 rwtq on a mustang dyno..

zero2sixT

iTrader: (4)

I'm not too worried about the numbers. It runs so much better. But from the dynos, before and after, and a wot run, it's definitely restricted.

I'm going to get the air filter replaced and go see what it does.

Thanks man, and everyone else for the help.

SamuelsonMotorsports

iTrader: (1)

I've got the same exact issue, although im running a stock LQ4 intake and throttle body and missing a assload of power as compared to your numbers (almost 60rwhp+) with similar head flow/cam combo.

Did you happen to have a dyno before the TBSS intake or was that mandatory? Im starting to think the NBS intake cannot handle much over 450hp flywheel or anything over 5,000.

zero2sixT

iTrader: (4)

I wish I could have done it that way. I basically pile up parts and put them all on at once. I can tell you all my dyno results were on the same dyno, tuned by the same tuner, both sessions close to the same time of year. If that helps at all.

From what I've seen, the 78mm can keep up with stock heads on stock cubed engines. I think it would be very much worth your while to run a 90mm intake.

Also have to add a correction. I had a small flare up of retardation earilier in this thread. My cai tubing is 4". The air filter has a 3.5" outlet to the maf. Then it swedges from the maf to the tubing.

tarinitup

iTrader: (11)

Could always do away with maf and tune it speed density.

03sierraslt

iTrader: (22)

Just remember comparing a mustang dyno to a dyno jet is not apples to apples.

zero2sixT

iTrader: (4)

Just wanted to update this thread to help anybody doing a search.

I swapped out the aem cone filter for a spectre cone filter. Made a WOT run yesterday from about a 25 roll. Huge difference. Before it seemed like it didn't want to pull past 115 mph. It wrapped the speedo passed 120 this time. Same stretch of road, almost identical run.

Think I'm still going to get a hi ram intake.

For the record the cai dimensions are: 8 x 11.5 x 6.5 inches spectre cone filter, 3.5" o.d. m.a.f. sensor, swedged to a 4" pipe.

thanks again for the help

hog

MAF is 85mm which equates to 3-1/3", so a 4" air intake even on a 85mm MAF would be an improvement of a 3" air intake and 85mm MAF.

Glad you are getting it figured out.
To take full advantage of your 4" air intake tubing.

75mm MAF was the aluminum bodied units used on the 1996-2002 L30/L31 305/350's and 1998-2002 LS1 F-bodies. These MAF's used a divorced IAT sensor. If you require a replacement for the aluminum bodied 75mm MAF from the GM dealerships parts counter, you will get a plastic MAF that fits and works fine, but it appears much differnt than the OEM aluminum MAF's.


85mm plastic bodied MAF with integral IAT sensor came about on the 1999-07 GMT 800 trucks with 4.8/5.3/6.0 and 8.1 liter engines.
In the C5 Vettes the 85mm came aboout on the 2001 LS6 in the ZO6. Then IIRC the same 85mm MAF came screenless in 2002-2004 on the 405hp version of the LS6. The Vettes could get away with a screenless MAF as the air intake plumbing is rather straight esp/ when compared to the trucks and esp. the SS Camaro's with it's wrap-around Ram Air air intake architecture to connect the t-body and the mid hood mounted air intake of the SS.

I remember a mid 2003 Duramax truck being at the shop with a hard front end hit, as such, it's air intake was all mangled and partially disassembled so I measured the MAF on it. IIRC the tubing that the card MAF slid into was exactly 4" or 102mm.
GM p/n 97209545


Then there was a guy that stated that the 2006 Duramax air cleaner assembly used a MAF bore that measured 123mm or 4.84" while using the same card style MAF. I could not verify this myself, take it for what it is.

peace
Hog