MAF size for 408
07-09-2011, 02:08 PM
#1
Teching In
Thread Starter
iTrader: (5)
Join Date: Nov 2005
Posts: 13
Likes: 0
Received 0 Likes
on
0 Posts
MAF size for 408 Guys,
What size MAF is needed for a stroked LQ9 408?
I keep hearing the stock LS1 MAF is too small. I believe it is 78MM.
If it is, will a Z06 85MM MAF cure the problem?
Oh yeah??? The problem is, we seem to be running out of air at WOT.
Using HP tuner to tune with.
It's either the tune, the MAF or weak valve springs. The heads were reworked about 2,000 miles ago, although we did discover we were running too long of a pushrod. Changing the pushrods helped alot.
There is no missfire at WOT Pulls to 6,000 hard then falls off.
Running a LS6 intake,ported TB, custom EPS cam 604/607 lift, shorty headers, gutted cats, Magnaflow exhaust, 243 Patriot stg 2 heads (reworked) (valves were not seating correctly out of the box), 36# FAST Injectors, 255LPH fuel pump, K&N cold air intake setup.
Any answers appreciated...
What size MAF is needed for a stroked LQ9 408?
I keep hearing the stock LS1 MAF is too small. I believe it is 78MM.
If it is, will a Z06 85MM MAF cure the problem?
Oh yeah??? The problem is, we seem to be running out of air at WOT.
Using HP tuner to tune with.
It's either the tune, the MAF or weak valve springs. The heads were reworked about 2,000 miles ago, although we did discover we were running too long of a pushrod. Changing the pushrods helped alot.
There is no missfire at WOT Pulls to 6,000 hard then falls off.
Running a LS6 intake,ported TB, custom EPS cam 604/607 lift, shorty headers, gutted cats, Magnaflow exhaust, 243 Patriot stg 2 heads (reworked) (valves were not seating correctly out of the box), 36# FAST Injectors, 255LPH fuel pump, K&N cold air intake setup.
Any answers appreciated...
07-09-2011, 02:38 PM
#2
TECH Addict
iTrader: (10)
Join Date: Jun 2004
Location: Commerce Twp, MI
Posts: 2,918
Likes: 0
Received 0 Likes
on
0 Posts
Z06 MAF will help some. A FAST 90/90 or higher will help more...especially over 6K RPM.
I run a 85MM with a FAST setup on my stock shortblock. Pulls real nice up top.
I run a 85MM with a FAST setup on my stock shortblock. Pulls real nice up top.
07-09-2011, 03:45 PM
#3
TECH Apprentice
iTrader: (8)
Join Date: Dec 2005
Location: Morris, IL
Posts: 395
Likes: 0
Received 0 Likes
on
0 Posts
Im not sure what the duration is on your cam - but for perspective my 416 has a 244/250 hyd roller in it with TFS 235s.
with the pacesetter lts, fast 92/92, and Z06 85mm MAF, hp pretty much flat lined at 5,700 rpm to 6,400rpm then started going down. Was 3 cells from maxing out the MAF.
Swapped out the pacesetters for some kooks stepped lt's, didn't put it back on the dyno but data logs indicated I was still choking my engine past 5,700 rpm. Swapped a supervic/4150 tb but haven't even driven it yet. Will be going SD tune though.
In your case, I do not think going with a bigger MAF alone will provide the gain you are looking for. If you upgrade the MAF, highly consider upgrading the intake and TB as well.
with the pacesetter lts, fast 92/92, and Z06 85mm MAF, hp pretty much flat lined at 5,700 rpm to 6,400rpm then started going down. Was 3 cells from maxing out the MAF.
Swapped out the pacesetters for some kooks stepped lt's, didn't put it back on the dyno but data logs indicated I was still choking my engine past 5,700 rpm. Swapped a supervic/4150 tb but haven't even driven it yet. Will be going SD tune though.
In your case, I do not think going with a bigger MAF alone will provide the gain you are looking for. If you upgrade the MAF, highly consider upgrading the intake and TB as well.
04-10-2020, 08:43 PM
#6
Teching In
Join Date: Feb 2012
Location: indiana
Posts: 1
Likes: 0
Received 0 Likes
on
0 Posts
408 shutting off at 5700 rpm Im not sure what the duration is on your cam - but for perspective my 416 has a 244/250 hyd roller in it with TFS 235s.
with the pacesetter lts, fast 92/92, and Z06 85mm MAF, hp pretty much flat lined at 5,700 rpm to 6,400rpm then started going down. Was 3 cells from maxing out the MAF.
Swapped out the pacesetters for some kooks stepped lt's, didn't put it back on the dyno but data logs indicated I was still choking my engine past 5,700 rpm. Swapped a supervic/4150 tb but haven't even driven it yet. Will be going SD tune though.
In your case, I do not think going with a bigger MAF alone will provide the gain you are looking for. If you upgrade the MAF, highly consider upgrading the intake and TB as well.
with the pacesetter lts, fast 92/92, and Z06 85mm MAF, hp pretty much flat lined at 5,700 rpm to 6,400rpm then started going down. Was 3 cells from maxing out the MAF.
Swapped out the pacesetters for some kooks stepped lt's, didn't put it back on the dyno but data logs indicated I was still choking my engine past 5,700 rpm. Swapped a supervic/4150 tb but haven't even driven it yet. Will be going SD tune though.
In your case, I do not think going with a bigger MAF alone will provide the gain you are looking for. If you upgrade the MAF, highly consider upgrading the intake and TB as well.
04-11-2020, 12:30 AM
#7
TECH Senior Member
Good question- Poster hasn't been here in about 8 years
