rza2042

iTrader: (2)

Hey Guys,

Over the weekend I had my car put on the dyno. I had a base run with E370, RHFC's, drop-in filters and silicone tubes. The car made decent numbers: 289hp and 239tq.

My reason for bringing the car in was to have the M730 installed, have new spark plugs installed and to get a tune. So... after the M370/plugs were installed the car was put on the dyno again and lost power (9hp/5tq). By looking at the results it seems that it lost power in the area where it's supposed to gain (mid to upper mid-range) from the M370.

The shop was unable to tune it due to the fact that I have a newer ECM and they did not have the ROM file in their library. They made a copy of it and sent it to UpRev. The shop owner said it should be about two weeks before UpRev will send back the new ROM.

My questions:

1) Will a tune correct the loss of power?
2) Could there be any external factors for the loss of power (install of new spark plugs or the ECU needing to relearn, humidity, etc.)?

The solid line on the graph is the best run without the M370 while the dotted line is the best run with the M370. I'm sure I'm missing something so any constructive input is welcome.

Can'tGme

iTrader: (1)

I don't know a lot about tuning but I'm gonna say a tune with bring your HP back and probably give you more. Someone else will chime in with more knowledge than myself.

IPL 370GT

iTrader: (22)

Did you inquire with Bobby about tune adjustments? When you have it tuned they'll tweak and critique things. I'm sure you'll have better numbers to share

Think47

I have seen quite a few cars around my area on the dyno and they never seem to pick up power with this intake manifold

rza2042

iTrader: (2)

Spoke with Bobby and he was concerned about the loss of power. He was also concerned about tuning to regain/make additional power. Great group of guys at CIN though. Honest and hard-working.

Spoke with Tony from Motordyne and sent him the dyno sheet. He said that something didn't look right (too many variables in addition) and offered assistance when I go back for the tune. Customer support from Motordyne is outstanding!

G37Sam

I'm looking at your AFR plots and it doesn't seem like they're very far off. Definitely not enough to warrant the loss in hp and torque that you are experiencing.

ANMVQ

iTrader: (13)

The tune should bring back the WHP but is this also a "learn" with the ECU? I now that we have to put miles on the car for the ECU to relearn.

G37Sam

A tune would "bring back" whp if the added bolt ons caused the engine to run too lean due to the increased flow. That is not the case in the above. A tune in his case will probably add a few degrees to his ignition timing and the gains would show irrespective of the M370. Again, I'm basing this on the dyno plot.

rza2042

iTrader: (2)

Uprev has sent the new ROM file back to the shop and I'm hoping to get the car tuned in two weeks. Will have an update then and hopefully some positive results. If not, there will be a M370 for sale . The car definitely feels different and is shifting different. Feels like there is more low-end torque and it shifts through the gears quicker. Maybe the ECU is still learning and the high level of humidity in the shop, post M370 install, caused lower then expected results. Just speculating as there are a ton of variables...

chuckie311

iTrader: (3)

i can tell you i did not feel an immediate bump in power on my m370 untill a day or 2 later after driving for awhile..now i can feel the difference in the mid-range everytime...im sure they will do another dyno before they start tuning and hopefully you will have gained what you lost before the tune..but dont froget different days on the dyno will reflect diffrent number as well...im getting tuned monday but 2 years ago i had a dyno done and was at 314hp and 256tq..im not expecting anything near that now that im running 20s and its going to be about 30 degrees hotter when its on the dyno this time..

]\[ /-\ ]\/[

iTrader: (3)

that doesn't sound good. I just got my M370 in the mail yesterday

JohnsVert

iTrader: (3)

Please keep us dated on this , especially with the results after the tune

808MIKE

iTrader: (1)

Would this new Manifold work on my VQ35HR 07 Sedan...SInce it's based of this engine? Or is it just made to work on the VQ37 Engines?

Iilac

iTrader: (4)

The manifold is based on the vq35hr manifold so it is a waste of money for G35 sedans.

SS_FireHawk

iTrader: (1)

I did a lot of research on this with mine and had a couple other guys confirm similar results on their own. After tuning, there was more midrange, with about a 2whp loss up top. There was more average power over the curve. Posted below are my results. I had some bad O2 sensors, but both manifolds were tuned and tested under the same conditions.