F.I. Long-Tube Headers installed - Review/Pics/Vids/Dyno

semtex · 04-23-2010, 08:07 PM

Quote:

Originally Posted by F.I. Inc.

Looking good, looking good! Torque and power throughout the curve are by far the most important.

I want to point out one thing. Some of you will think I am taking a jab but I have a hunch. I am extremely confident that the reason is top end power tails with our long tube headers is due to the Stillen CBE. I feel from a design standpoint that the Stillen CBE is now causing a restriction at that RPM level when combined with our long tube headers. In a nutshell, I think the headers flow too much for the CBE!

Take it as you will, but ask yourself why else would the power drop off. It is not like our headers are more restrictive than the previous setup on the car. Well, if it isn't the headers causing the restriction it has the be the one other component.

Before anyone says anything in reply, please mow my theory over in your head. I am not trying to bash. Personally I think Semtex's car sound great with his current setup. I just want to put all of the cards on the table...

Thank you, Tony

Tony, your theory is certainly plausible. But if the CBE is too restrictive for the increased flow at the top end, wouldn't that just prevent any gains from being realized? In other words, why would it cause actual loss? Wouldn't we just see the numbers stay flat?

F.I. Inc. · 04-23-2010, 08:16 PM

Quote:

Originally Posted by semtex

Tony, your theory is certainly plausible. But if the CBE is too restrictive for the increased flow at the top end, wouldn't that just prevent any gains from being realized? In other words, why would it cause actual loss? Wouldn't we just see the numbers stay flat?

It is possible but it would all depend on how restrictive the CBE became at that RPM level. Now obviously the CBE is not restricting the exhaust in the low end or mid range or you would have the same effect there.

WShade · 04-23-2010, 09:05 PM

semtex: 154

It's available.

F.I. Inc. · 04-23-2010, 09:10 PM

Quote:

Originally Posted by WShade

semtex: 154

It's available.

Actually he would be #155.

#153 & #154 are taken. I just haven't added them to the list yet...

Tony

G37Sam · 04-23-2010, 09:27 PM

Thanks for the review and dyno's Semtex

Rep to you

370Zsteve · 04-23-2010, 10:00 PM

Those dyno graphs show a nice fat power increase right where you want it, who gives a rat's *** about what the engine puts out at 7500rpm, that mid-graph HP AND TQ increase is huge.

Demon Z · 04-23-2010, 10:07 PM

Great writeup. I'm hoping to get the whole F.I. enchilada myself.

labk888 · 04-23-2010, 11:16 PM

Ugh.. I was hoping that I was going to snag #154. Tony expect a phone call...sooon

DannyGT · 04-23-2010, 11:40 PM

Semtex, Tony might be right because if I remember correctly, the diameter in the Stillen exhaust varies from head to toe. Its something wierd like 2.25 > 3?? > 2.25 > 2.5 > out. Please dont quote me, I just thought I remember thinking that to myself when I hacked up the exhaust. They dont use a consistant diameter throughout and that might be a restriction as it reaches the top.

chuckd05 · 04-24-2010, 12:08 AM

Wow can't believe I missed the tq being there. Lol. Oops

semtex · 04-24-2010, 12:08 AM

Quote:

Originally Posted by F.I. Inc.

Actually he would be #155.

#153 & #154 are taken. I just haven't added them to the list yet...

Tony

I sent you pm, Tony.

semtex · 04-24-2010, 12:49 AM

I just noticed that the paper printout of the dyno I got from Sharif is actually a little easier to read than the screen capture, so I scanned it in. The lines are thinner so you can see the deltas better and more precisely.

SkyZ · 04-24-2010, 02:29 AM

not sure if this has been covered but since i didnt want to go through all the pages of stuff, will the lth with aftermarket exhaust be able to pass emissions? or will i have to pay to have them removed before taking the test?

shumby · 04-24-2010, 03:20 AM

if you cannot be bothered to read we cannnot be bothered to help oyou

nogoodname · 04-24-2010, 03:26 AM

Quote:

Originally Posted by SkyZ

not sure if this has been covered but since i didnt want to go through all the pages of stuff, will the lth with aftermarket exhaust be able to pass emissions? or will i have to pay to have them removed before taking the test?

I doubt it would pass....lol.... where in Canada are you from?

Emission tests don't exist where I live....lol

04-23-2010, 09:05 PM	#63 (permalink)
WShade Track Member Join Date: Jan 2009 Location: San Antonio, TX Posts: 765 Drives: 09 370Z T/S/N Rep Power: 187	semtex: 154 It's available. __________________ Q50S Q60 RS400

04-23-2010, 09:27 PM	#65 (permalink)
G37Sam A True Z Fanatic Join Date: Dec 2008 Location: Dubai, UAE Posts: 1,507 Drives: RB'd G37 Rep Power: 21	Thanks for the review and dyno's Semtex Rep to you __________________ '14 Viper GTS '08 RB'd G37S - Sold

04-23-2010, 10:00 PM	#66 (permalink)
370Zsteve A True Z Fanatic Join Date: Sep 2009 Location: Gold Coast CT Posts: 10,599 Drives: 2019 Corvette G.S. Rep Power: 43	Those dyno graphs show a nice fat power increase right where you want it, who gives a rat's * about what the engine puts out at 7500rpm, that mid-graph HP AND** TQ increase is huge. __________________ SOLD MY Z MARCH 2018 - another Core OG moves on - new ride 2019 Z Corvette Grand Sport - no mods necessary but already have eyes on HFC and intakes LOL IT NEVER ENDS. Last edited by 370Zsteve; 04-23-2010 at 10:02 PM.

04-23-2010, 11:16 PM	#68 (permalink)
labk888 Base Member Join Date: Dec 2008 Location: Big D Posts: 233 Drives: '10 370Z PW 6MT T&S Rep Power: 533	Ugh.. I was hoping that I was going to snag #154. Tony expect a phone call...sooon __________________ LABK 10' 370Z/PW/6MT/Touring Sport/Illum. Kicks/Ventureshield Ultra/F1 Pinnacle 15% Tint/PLX KIWI

04-23-2010, 11:40 PM	#69 (permalink)
DannyGT Track Member Join Date: Jan 2009 Location: Jersey Posts: 919 Drives: 370Z (SOLD) Rep Power: 279	Semtex, Tony might be right because if I remember correctly, the diameter in the Stillen exhaust varies from head to toe. Its something wierd like 2.25 > 3?? > 2.25 > 2.5 > out. Please dont quote me, I just thought I remember thinking that to myself when I hacked up the exhaust. They dont use a consistant diameter throughout and that might be a restriction as it reaches the top. __________________ Performance GTM Stage 1 SC, GTM Res.Test Pipes, Invidia Gemini Exhaust, GTM HD Oil Cooler Wheels & Suspension AME Tracer TM02's 19x9.5F 19x10.5R w/ 265x35F & 305x30R, Hotchkis Sways, BC (BR) Racing Coilovers (Car Sold)

04-23-2010, 10:07 PM	#67 (permalink)
Demon Z Base Member Join Date: Nov 2008 Location: Central Ohio Posts: 229 Drives: '13 FR-S Rep Power: 17	Great writeup. I'm hoping to get the whole F.I. enchilada myself.

04-24-2010, 12:08 AM	#70 (permalink)
chuckd05 A True Z Fanatic Join Date: Oct 2009 Location: NY Posts: 2,391 Drives: No longer a Z Rep Power: 20	Wow can't believe I missed the tq being there. Lol. Oops __________________ 09 370Z 6M PW - FBO Best 1/4 mile = 12.926 @ 109 SOLD -- 08 BMW 135i - FBO 12.1@120mph SOLD -- white 09 e92 335 Coupe Mtech - 11.9 @ 119 :-)

04-24-2010, 12:49 AM	#72 (permalink)
semtex A True Z Fanatic Join Date: Jan 2009 Location: Behind enemy lines Age: 54 Posts: 5,995 Drives: People to drink Rep Power: 32	I just noticed that the paper printout of the dyno I got from Sharif is actually a little easier to read than the screen capture, so I scanned it in. The lines are thinner so you can see the deltas better and more precisely. __________________ "There are no small accidents on this circuit." -- Ayrton Senna 316.8whp & 248 ft/lbs (Dyno Dynamics) \| 319whp & 256 ft/lbs (DynoJet) (04/23/10) Stillen G3 CAI, CBE, Pulley / F.I. LTH / GTSpec Ladder Brace / Setrab Oil Cooler / UpRev-tuned by Forged Perf.

04-24-2010, 02:29 AM	#73 (permalink)
SkyZ Enthusiast Member Join Date: Jul 2009 Location: Canada Posts: 382 Drives: 09 370z PG M6 Rep Power: 16	not sure if this has been covered but since i didnt want to go through all the pages of stuff, will the lth with aftermarket exhaust be able to pass emissions? or will i have to pay to have them removed before taking the test?

04-24-2010, 03:20 AM	#74 (permalink)
shumby Captin Canuck Join Date: Dec 2008 Location: with your mom Age: 44 Posts: 6,288 Drives: your sister Rep Power: 237	if you cannot be bothered to read we cannnot be bothered to help oyou __________________ Originally Posted by SAM@GTM Engine detonation is not normal and it should never never happen, and whoever told that need to do something else for living . Sam

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