ShortThrow50
Member
^ oh hell yeah man i agree about the tune. Dont get me wrong, my car runs good without a tune but Im just waitin on a tweecer that I asked for for christmas lol
This was mine before a retune,longtubes and a bigger maf.
So you gained roughly 40 RWHP and 50 RWTQ from just those mods?
I'm guessing the bigger MAF and longtubes were only worth about 15 of that. Leaving the other 25 RWHP gain from the tune. Pretty impressive.
I'd love to get rid of the shorties and cat's, but mine is daily driven and has to go through emissions regularly. I didn't wan't to have to swap exhaust every year. And since my car is lowered, I didn't want to sacrifice anymore ground clearance for the longtubes.
I got a thought or two here
Sure a tune would help
but
Similar combos with no tune that made more power are available
If you got high flow cats ...
I don't see them holding you back much ... 3 to 5 rwhp for a ball park value
I believe I've seen it said cats will show around .75 of one point leaner if a
sniffer wb has been used ... but ... my memory is fuzzy about that amount.
however ... I do know leaner results will be seen
I gotta believe something simple is at fault here
and
My gut tells me you need more fuel
I feel 24's for an aftermarket h/c/i combo are close to the limit
and
All the more so at OEM fuel pressure :Word:
The thing someone told you about O2's being in effect at WOT is not true
If you were to reset your pcm before a dyno pull or 1/4 mile blast .....
The pcm would not have had the amount of time it needed to make
changes to compensate for elevated fuel pressure due to an afpr
Grady
But unless we know the EXACT details,
fuel pressure
fuel pump(fuel filter ever been replaced)
timing (total and across the board)
deck height (5.0's are known NOT to be square)combined with gaskets used
how much the cats are actually flowing(high flow cats have a pretty short life span - 1~3 years tops -depending on the air/fuel mixture speeds this up)
a/f BEFORE the cats
if the cam was degreed in or just installed dot to dot
39psi fuel pressure.
New fuel filter.
255lph Walbro pump.
18 degree's initial timing(stock distributor and A9T ECU).
Fel-Pro 9333 head gaskets.
Cat's have about 3K miles on them.
14:1 AFR was measured after the cats at the tail pipes.
Cam was set straight up, dot to dot.
I have say, I do not believe the final "peak" number is hurt by the shorties, if they are aftermarket. The lower torque/horsepower values, yet, but not the upper rpm range.
Getting rid of cats is something I would look into, plus it is lighter.
This is all if you do not have to pass emissions.
You know im going to have to disagree since i know what mine picked up..But like ive said before every car reacts different.
There is a good 30+ horsepower left in the combo,esp with a higher flowing exhaust and tune..But its up to the OP what he wants to do.
The timing curves in the a9t could be something to look at.
Personally , with the current mods i think you are where you should be.
Figure 20+ rwhp with longtubes and highflow cats.
10+rwhp in the tune a few more if you open up the mass air meter(plus you wil gain better drivability with a ford maf like the lightning mass air.
My car picked up 10+rwhp on tune alone (before longtubes and new meter).
But the car drove great ,just stalled every once in awhile.
For exhaust, I have BBK 1 5/8" unequal ceramic coated shorties going into a 2 1/2" BBK high flow catted H going into a 2 1/2" Flowmaster Delta Flow aftercat. I can't see longtubes and no cats making much of a difference over that. Certainly not 20+ RWHP.
For intake, I have the stock airbox with a flat panel K&N going into a C&L 76mm MAF meter with a C&L 76mm inlet pipe.
No driveability issues. Car doesn't stall or stumble. It's a little lazy below 3K, but it pulls hard to 6K after that.