Forced Fed Headers Review
#16
Originally Posted by o snap its eric
update of the header after a tune?
Before I showed up for my tuning, the mechanic at the shop had talked to the lead technician at Unichip to find out ahead of time if any wires needed to be altered on the harness. The mechanic had thought that one of the wired needed to be modified, but Unichip confirmed that no alterations needed to be made. So he downloaded various modified G/Z map files that would be our baseline to tune from.
When I showed up all was ready to go and a short while later he had the harness installed. Once the car started running on the dyno, we tried the closest map files based off of my modifications, but nothing was making any significant difference. After a bit of investigation, it turned out that the map files were reverting back to stock maps under load.
They tried to get the wiring schematic faxed to them that day, but it didn't show up until the next day. It turned out that the problem was indeed that a wire had to be cut and respliced into a different location. They didn't have time last week to make the alterations necessary and try tuning it again. So we're shooting for this week to get it done.
On a positive note: Even though we spent about 2+ hours basically to get the harness and Unichip ECU installed, I did make 2 hp and 2 tq more than my last dyno runs. 230 to the wheels with an auto! Whoo hoo! With tuning, we're expecting around 240whp.
I'll keep you posted.
#18
Originally Posted by 4DrSkyline
On a positive note: Even though we spent about 2+ hours basically to get the harness and Unichip ECU installed, I did make 2 hp and 2 tq more than my last dyno runs. 230 to the wheels with an auto! Whoo hoo! With tuning, we're expecting around 240whp.
Thanks
#19
Originally Posted by kosmic
What other mods besides headers, midpipe and (soon to be) unichip do you have? Also, what kind of dyno?
Thanks
Thanks
#20
#21
Originally Posted by 4DrSkyline
My current performance mods are: K&N panel filter, Z tube, Motordyne 5/16" plenum spacer, UR crank pulley, GroundGear 10-wire grounding wires, ForcedFed headers, Gruppe-S y-pipe, and coupe mid-pipe. The dyno was a DynoJet 248 in-ground dyno.
it's easy and free. Then just use the [IMG] tag to add the image to a post.
#22
Let's see if I did this correctly... Below should be pictures of the collector area (both inside and out) and one showing the flange thickness.
<a href='http://putfile.com/pic.php?pic=6/16310183538.jpg&s=f5' target='_blank'><img src='http://f5.putfile.com/6/16310183538-thumb.jpg' alt='Click to enlarge'></a> <a href='http://putfile.com/pic.php?pic=6/16310202225.jpg&s=f5' target='_blank'><img src='http://f5.putfile.com/6/16310202225-thumb.jpg' alt='Click to enlarge'></a> <a href='http://putfile.com/pic.php?pic=6/16310192369.jpg&s=f5' target='_blank'><img src='http://f5.putfile.com/6/16310192369-thumb.jpg' alt='Click to enlarge'></a>
<a href='http://putfile.com/pic.php?pic=6/16310183538.jpg&s=f5' target='_blank'><img src='http://f5.putfile.com/6/16310183538-thumb.jpg' alt='Click to enlarge'></a> <a href='http://putfile.com/pic.php?pic=6/16310202225.jpg&s=f5' target='_blank'><img src='http://f5.putfile.com/6/16310202225-thumb.jpg' alt='Click to enlarge'></a> <a href='http://putfile.com/pic.php?pic=6/16310192369.jpg&s=f5' target='_blank'><img src='http://f5.putfile.com/6/16310192369-thumb.jpg' alt='Click to enlarge'></a>
Last edited by 4DrSkyline; 06-13-2006 at 10:27 AM.
#23
#24
Originally Posted by 4DrSkyline
I think in reality, only Crawford has true equal length headers. All others appear to be unequal. On the dyno, though, it appears that you can make nearly as much power with aftermarket unequal lenght headers. The difference in price and added installation costs don't seem worth it to me.
#25
Originally Posted by OCG35
Hmmm... I wonder why Stillen claims "equal length" in their catalog and website?
With the power I made on the dyno with the headers, I couldn't care less if they were equal length or unequal length. More power is more power.
#26
UPDATE:
I finally got a chance to have my Unichip tuned for all of my modifications. The garage where it was tuned was 95+ degrees the whole time, so the tuner was having a hard time getting an accurate tune with all the heat soak. Most runs came out around 232-235 rwhp. We wanted one final run before giving up for the day, so we let the car sit for 10 minutes with the shop's fan on top of the engine. After the final run was over, I was up over 10hp and almost 4 tq compared to my previous runs. 241 whp! I guess I finally can say my car is in the 300hp club (at the crank, of course).
Here's the dyno sheet:
<a href='http://putfile.com/pic.php?pic=6/16718252069.jpg&s=f5' target='_blank'><img src='http://f5.putfile.com/6/16718252069-thumb.jpg' alt='Click to enlarge'></a>
If we can get a mid-80 degree day, we'll look at retuning. The heat soak is just too great to keep consistently running WOT time after time on the dyno with the outside temperature in the mid-90s.
Getting back to how these headers perform, a guy with a 350z/6spd/Injen intake/ForcedFed headers made 256whp while I was waiting. Not to shabby for only two mods.
I finally got a chance to have my Unichip tuned for all of my modifications. The garage where it was tuned was 95+ degrees the whole time, so the tuner was having a hard time getting an accurate tune with all the heat soak. Most runs came out around 232-235 rwhp. We wanted one final run before giving up for the day, so we let the car sit for 10 minutes with the shop's fan on top of the engine. After the final run was over, I was up over 10hp and almost 4 tq compared to my previous runs. 241 whp! I guess I finally can say my car is in the 300hp club (at the crank, of course).
Here's the dyno sheet:
<a href='http://putfile.com/pic.php?pic=6/16718252069.jpg&s=f5' target='_blank'><img src='http://f5.putfile.com/6/16718252069-thumb.jpg' alt='Click to enlarge'></a>
If we can get a mid-80 degree day, we'll look at retuning. The heat soak is just too great to keep consistently running WOT time after time on the dyno with the outside temperature in the mid-90s.
Getting back to how these headers perform, a guy with a 350z/6spd/Injen intake/ForcedFed headers made 256whp while I was waiting. Not to shabby for only two mods.
Last edited by 4DrSkyline; 06-17-2006 at 06:43 PM.
#28
For anyone interested in these headers, I saw on My350z that ForcedFed has lowered the price from $499 to $449 for the month of July.
http://my350z.com/forum/showthread.p...ight=ForcedFed
http://my350z.com/forum/showthread.p...ight=ForcedFed
#29
Originally Posted by 4DrSkyline
For anyone interested in these headers, I saw on My350z that ForcedFed has lowered the price from $499 to $449 for the month of July.
http://my350z.com/forum/showthread.p...ight=ForcedFed
http://my350z.com/forum/showthread.p...ight=ForcedFed
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