Alright guys I have a momentum kit. I got it installed on my 04 5at in the last week of July this year to only 4 psi. My z is currently getting the transmission completely rebuilt since I somehow blew it on only 4 psi putting down 310whp. My goal is to be around the 370-380 whp area. I am going to get it retuned within the next couple of weeks and want to make sure I have everything before I drop another 600 for the tune.

The Kit has:
Garrett GT35R with TiAL 1.03 A/R stainless v-band housing
Intercooler: Custom high fin density bar and plate (9” x 22” x 3.25”)
Wastegate: TiAL MV-R
Blow-off-valve: TiAL Q 50mm
Downpipe: 3″ 304 stainless with spare O2 bung for wideband installation
Up-pipe: 2 1/4” 304 stainless
Intake/Charge Piping: 3″ 6061 Aluminum with an integrated billet MAF housing
Injectors: DeatschWerks 600cc
Fuel Pump: Walbro 255
Tune: UpRev

Tranny:
Gtm's Transmission cooler
Upgraded internals :
clutch packs
Torque converter
valve body
etc....

I do not want to do anything to the engine at this time internally. Anything I may want to also add to my setup before the retune that you guys would recommend for my desired output of 370 to 380? I was thinking maybe a plenum spacer just to help with the airflow in the engine but i cannot think of anything else.

Thanks again.

 

With this set up 400hp should be no issues. Only weak point is the transmission but it sounds like you are taking care of that. You should be able to run 8-9 psi all day.

 

thanks for the response what do you think about getting a plenum since their 80$ off right now at z1 just for airflow help?

 

There is no real need right now for the spacer. From what I am told, it does help air flow to the 2 front cylinders. But being that you are FI, I think that it may not be needed.
I could be completly wrong.

 

^ I agree

 

yea im not going to get it for hp gain just the airflow for the 2 cylinders but i am curios if the airflow gained to the front 2 is a significant increase from the amount they get now.

 

You will see a few HP gain. Not significant at all. I have a Kinetix V+ plenum on mine. When I was NA I noticed Nothing at all. Actually i noticed a decrease in performance, then I had it tuned. After I felt like I spent all that money on nothing. Meaning if felt the same as stock to me. I say just save the few $$$ and enjoy the new found power with the new trans build and the increased PSI.. You will have pleanty of power on tap..

 

I'd add an oil cooler and a low temp thermostat.

 

Ur tranny upgrades r great and are more than enough for ur specific power goals. I'm surprised stock tranny didnt hold out at such a low boost level. This is the first time I've ever heard someone running 4lbs lol.

 

haha i wanted to get the kit on for the price i got installed and tuned but i knew the 5at trannys suck so i just wanted to have fun with it then build it when it blew did not take long as you can see last week in July to first weekend in october.

 

I have an oil cooler i thought i mentioned it but i will look into the low temp thermostat thanks for the input

 

I agree to save the money. The only reason I run mine is because I already had it installed when NA. With FI you are forcing the air so power output increase will be negligible.

 

Thanks everyone for the replies. I must have not been clear enough. I know the plenum will not add hp that is not why i would purchase it. I would purchase for the gaining more noticeable airflow to the top 2 cylinders and am asking would i gain significant airflow to the top 2 cylinders then without installing it. Sorry for the confusion

 

If you do get a plenum spacer... go with the Motordyne 5/16 Basic (Plenum Spacer and gasket in one)... more than enough head room and seems to be the spacer of choice for FI. I had a custom Fat plenum (3" Tall) before when I was NA and lost close to 40whp on dyno with FI. I then went back to stock plenum and gained some of it back but the best results were with 5/16 spacer.

How do you plan on raising your boost? Spring? I would recommend an EBC if you have the cash for it. You'll be able to fine tune the delivery of the boost better than just a spring change.

 

I havent up dated this in awhile but i bought the nismo r tune low temp thermostat and did not end up getting the spacer friday is tuning days should hopefully have a video and dyno for you guys

 

I would only buy a spacer that is tapered as this will aid with the additional air to the front cylinders. Adding a spacer which is machined parallel will not help equalize the airflow across all cylinders.

http://www.z1motorsports.com/350_g35...oducts_id=2189

 

FYI, not sure whose doing the tuning and how much 5AT/uprev experience they have but make absolutely sure your tuner is setting up the load % tables correctly for a 5AT. If not, your TC will either lock up too late or not at all and you'll blow the 5AT built or not. That said if you've got dyno sheets on a roller style dyno it should be fairly easy to tell what the TC is doing (or not). Hub dynos are not so easy to tell.

 

A re-tune should be about $200.

 

+1000000000.

 

Nismo Thermostat

my runs my car almost 20 degrees cooler than stock on a summer day.