Garage Line, eBay, OBX header, custom CBE, dyno results.

synolimit

Garage line sold me a "prototype" LTH that's identical to the eBay OBX header and 99% like a Fast Intentions LTH. The only difference really is the scavenging star in the FI collector.

I installed these headers after wrapping with DEI titanium wrap and the fitment was perfect. The bottom center nut is hard to get on with where the pipes are but let's face it, LTH's are a PITA to install!

First thing I noticed on start up was the rasp! It was horrible! So I welded in some Helmholtz resonators in the X pipe right where the X pipe bolts to the header. This amazingly cut about 90% of the rasp but also if I had to guess cut about 20 decibels of volume which I didn't like.

Next I cut off my mufflers and straight piped them. The muffler I had, had the pipes 90 degree bend into the mufflers then 90 degree bend again out to the tips. I didn't like that flow design plus I wanted my volume back. Now I might have one of the loudest exhausts but just sounds insanely mean with zero rasp and zero drone.

I still have no tune and running rich so power can be made from a tune! I'm just happy the car is rich and not lean. After 6000rpm the AFR drops to 11.9 . If we target 12.5 AFR maybe, that's going to be some nice added power there.

Peak power was 13hp and 17tq but mid range gained anywhere from 11-17hp and 18-19tq. 293hp 243tq.

I went with the cleanest run but I did make 295hp 244tq.

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13 370z-

megalapagas

Impressive, Thumbs up mate

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GTM 34 Row Oil Cooler | K&N Drop Ins w/ Z1's Post MAF Tubes | F.I Non-Res'd 2.5" T.P w/ CF CBE | Axis Wheels | Piecing together My Own Custom T4 Top Mount Single Turbo Kit *Still in the works* |

DEpointfive0

Pics of your resonators?

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Riptide67

Very nice!

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2009 Nismo 370Z and 1975 Datsun 280Z 2+2 - PNW_INC - Legacy_Ohana
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synolimit

Don't judge. My 110v free mig sucks azz! Doesn't penetrate then over penetrates and blows holes so they get thick at times.

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13 370z-

luigi90210

any O2 code?

what about quality of welds with the headers?

i have seen short tube headers on ebay for $340 with test pipes and OBX LTH for about the same price

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SOLD 370z
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Minato

Sound clips! Nice gains! Are you worried about corrosion with the heat wrap? I have heard mixed things, I would have to guess with our coffin tight engine bay little water would get in

Chuck33079

What's the dip at 5200? Is it pulling timing there? I can't see why it would, it's got plenty of fuel.

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2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent

synolimit

I had one once at about 100 miles or so. I deleted it and it hasn't come back yet but I don't think I've gone another 100 yet.

The header looked great. Better than I could have made. Metal looks thick and strong, tigs are all good with penetration, but I don't know what makes welds fail. With all the CNT TS failing I reenforced the j tube.

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13 370z-

David Parra

Planning on dyno time ?

synolimit

Thanks

No sound clips. I hate youtube clips and stuff, nothing is like it in person for any exhaust and my phone is the last thing I'd use.

This doesn't help...and no, its real 304ss so no worries but my welds that are non SS which I haven't painted yet. I had an invidia down pipe on my 09 and 11 WRX for combined 50k and when I pulled it off to sell it looked very good.

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13 370z-

synolimit

No idea. Besides the AFR rich, the logs were perfect. The dyno driver, not the tuner logged it. His exact words were the tune is scary good. Timing, MAF, load etc all perfectly straight! The dip happened in all 3 at different spots. We think its dyno hiccups for just that 100 rpm and because the lines after are still on a perfect straight increase.

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13 370z-

Chuck33079

Yeah, if nothing showed up in the logs and it's on the printout, it's probably dyno weirdness. Now go get a tune and pull some of that fuel back out, there's plenty more power to be made.

How much of a difference do you think the ambient temps made?

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2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent

synolimit

Really? I guess maybe 10hp. Timing was 24-25 if that means anything. Not sure what tuned cars shoot for.

With a dyno jet having the correction factor target 75 degrees, none on these printouts. We did hit uncorrected. The numbers were lower but still a gap between the two lines so maybe a few ponies.

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13 370z-

synolimit

Soon.

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13 370z-