LTH with HFC + CBE = ?

SS_Firehawk · 03-30-2012, 05:18 AM

Just picked up the car and something is up with it and I'm not sure what it is. The idle feels and sounds lumpy like a cammed motor. The lumpiness doesn't go away the more it revs, it just speeds it up. My butt dyno tells me power is missing and the SES light blinks furiously any time I accelerate. I'm letting the computer try and tune itself for a few days before I bring it back and / dyno it. I took a video of me driving home for you all to listen, maybe you might know what is causing it or if it doesn't sound right. I also think I tracked that damn metal resonance to the heatshield that used to be by the cats. I'm going to get it removed and see how that works.

SS_Firehawk · 03-31-2012, 03:05 AM

So the M370 intake manifold was going ape $hit on my car. Don't know exactly what happened, but I put the stock one back on and everything went back to normal and I made more power than my last dyno pulls. I'll be bringing the manifold with me to Motordyne to see whats up with it. Looking at the dyno sheets, I gained 16 whp with the pulleys and CAI. Two dyno pulls were done immediately after the changeover. I'm thinking it would most likely be around 320whp after I put some miles on it. AFR's are in the mid to high 13's right now. With the M370, it was in the 14's. I have no idea why it ran so bad.

Full bolt ons Dyno

SS_Firehawk · 04-02-2012, 12:04 AM

I took the DRF files and loaded Winpep in my PC and created a graph of the gains. I was a bit surprised to see at least 10whp across the rpm range and even higher at over 6500rpm to redline from my previous and a huge improvement over stock. I think the pulleys really did a great job increasing hp under the curve and the intakes showing a boost higher in the rpm range where the stock intakes run out of breath. To zoom for any hotkey nooblets, just do ctrl +

Better images updated

SS_Firehawk · 04-02-2012, 03:28 PM

Testing the M370 hypothesis tonight on the stock manifold.

SS_Firehawk · 04-02-2012, 07:47 PM

Well, that wasn't it... I unplugged a throttle body and the engine was much quieter and wouldn't rev past 1500 rpm. It sounded nothing like it did with the M370. Idk...

SS_Firehawk · 04-07-2012, 01:35 AM

M370 going to get put on Monday again

SS_Firehawk · 06-22-2012, 09:08 AM

Finally updating this. When the M370 was put in, I lost over 12 whp and there was almost no low end gain. I tested at least 3 times on diff days to confirm. But I don't think it was the M370 manifold that's the culprit. A few weeks ago I decided to test my pre cat O2 sensors. I was trying to get a mail tune from uprev and it was untunable because one of my pre cat O2 sensors was not reading correctly. I narrowed it down to the passenger side exhaust manifold O2 sensor. I just placed the part on order and will be waiting for it to come in. This is most likely why I've had that SES light with P0300 for the past few months. My car had absolutely no power under 2krpm, I had minivans pull off lights with more grunt than mine would. My gas mileage is averaging only 15.5 mpg, I can smell gas in my fumes, and I can hear the engine stumble. Looking at the logging info, the uprev tuner told me that the ECU isn't reading the AF properly, so to be on the safe side, it's just dumping as much fuel as possible. The explains everything that was going on. I'll be doing a followup after I get it fixed with new numbers. Now that it's summer though, power most likely be lower than the sool spring and winter days.

MaDMaXX · 06-22-2012, 09:09 PM

OK, but point is, faulty sensor, and now it's fixed and feeling better?

tranceformer · 06-22-2012, 10:18 PM

Damn, you've been having some sh*tty luck with this car lately. I hope you get things worked out soon!

SS_Firehawk · 06-23-2012, 10:27 AM

Faulty sensor that has not been replaced yet. It may have been damaged during the header install. It's on order and ill be replacing when it arrives.

SS_Firehawk · 07-04-2012, 08:57 PM

Added pics of exhaust and vehicle on my profile.

Nissan 370Z Forum - SS_Firehawk's Albums

Part also came in and getting it fixed this week.

03-30-2012, 05:18 AM	#1 (permalink)
SS_Firehawk A True Z Fanatic Join Date: Oct 2011 Location: Tampa Posts: 4,142 Drives: 13' Magma Red Nismo Rep Power: 7336	Just picked up the car and something is up with it and I'm not sure what it is. The idle feels and sounds lumpy like a cammed motor. The lumpiness doesn't go away the more it revs, it just speeds it up. My butt dyno tells me power is missing and the SES light blinks furiously any time I accelerate. I'm letting the computer try and tune itself for a few days before I bring it back and / dyno it. I took a video of me driving home for you all to listen, maybe you might know what is causing it or if it doesn't sound right. I also think I tracked that damn metal resonance to the heatshield that used to be by the cats. I'm going to get it removed and see how that works. __________________ Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI New Car: Under Construction Last edited by SS_Firehawk; 03-30-2012 at 11:56 AM. Reason: video

04-02-2012, 03:28 PM	#4 (permalink)
SS_Firehawk A True Z Fanatic Join Date: Oct 2011 Location: Tampa Posts: 4,142 Drives: 13' Magma Red Nismo Rep Power: 7336	Testing the M370 hypothesis tonight on the stock manifold. __________________ Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI New Car: Under Construction

04-02-2012, 07:47 PM	#5 (permalink)
SS_Firehawk A True Z Fanatic Join Date: Oct 2011 Location: Tampa Posts: 4,142 Drives: 13' Magma Red Nismo Rep Power: 7336	Well, that wasn't it... I unplugged a throttle body and the engine was much quieter and wouldn't rev past 1500 rpm. It sounded nothing like it did with the M370. Idk... __________________ Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI New Car: Under Construction

04-07-2012, 01:35 AM	#6 (permalink)
SS_Firehawk A True Z Fanatic Join Date: Oct 2011 Location: Tampa Posts: 4,142 Drives: 13' Magma Red Nismo Rep Power: 7336	M370 going to get put on Monday again __________________ Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI New Car: Under Construction

06-22-2012, 09:08 AM	#7 (permalink)
SS_Firehawk A True Z Fanatic Join Date: Oct 2011 Location: Tampa Posts: 4,142 Drives: 13' Magma Red Nismo Rep Power: 7336	Finally updating this. When the M370 was put in, I lost over 12 whp and there was almost no low end gain. I tested at least 3 times on diff days to confirm. But I don't think it was the M370 manifold that's the culprit. A few weeks ago I decided to test my pre cat O2 sensors. I was trying to get a mail tune from uprev and it was untunable because one of my pre cat O2 sensors was not reading correctly. I narrowed it down to the passenger side exhaust manifold O2 sensor. I just placed the part on order and will be waiting for it to come in. This is most likely why I've had that SES light with P0300 for the past few months. My car had absolutely no power under 2krpm, I had minivans pull off lights with more grunt than mine would. My gas mileage is averaging only 15.5 mpg, I can smell gas in my fumes, and I can hear the engine stumble. Looking at the logging info, the uprev tuner told me that the ECU isn't reading the AF properly, so to be on the safe side, it's just dumping as much fuel as possible. The explains everything that was going on. I'll be doing a followup after I get it fixed with new numbers. Now that it's summer though, power most likely be lower than the sool spring and winter days. __________________ Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI New Car: Under Construction Last edited by SS_Firehawk; 06-22-2012 at 09:10 AM.

06-22-2012, 09:09 PM	#8 (permalink)
MaDMaXX Enthusiast Member Join Date: Jan 2012 Location: Oregon from England Posts: 292 Drives: 350z Rep Power: 15	OK, but point is, faulty sensor, and now it's fixed and feeling better? __________________ '04.5 350Z - Very Motordyne.

06-22-2012, 10:18 PM	#9 (permalink)
tranceformer A True Z Fanatic Join Date: Nov 2008 Location: Palm Beach, FL Posts: 1,213 Drives: 2009 370Z PW 6MT Rep Power: 269	Damn, you've been having some shtty luck with this car lately. I hope you get things worked out soon! __________________ Ray* 2009 370Z Base Sport 6MT / 12.860 @ 109.09mph / 1.921 60ft / street tires official 1/4 mile track times

06-23-2012, 10:27 AM	#10 (permalink)
SS_Firehawk A True Z Fanatic Join Date: Oct 2011 Location: Tampa Posts: 4,142 Drives: 13' Magma Red Nismo Rep Power: 7336	Faulty sensor that has not been replaced yet. It may have been damaged during the header install. It's on order and ill be replacing when it arrives. __________________ Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI New Car: Under Construction

07-04-2012, 08:57 PM	#11 (permalink)
SS_Firehawk A True Z Fanatic Join Date: Oct 2011 Location: Tampa Posts: 4,142 Drives: 13' Magma Red Nismo Rep Power: 7336	Added pics of exhaust and vehicle on my profile. Nissan 370Z Forum - SS_Firehawk's Albums Part also came in and getting it fixed this week. __________________ Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI New Car: Under Construction