1998 with a 3.5 swap
 

http://i176.photobucket.com/albums/w...nal20Runs1.jpg


This is first run compared to my last. I was on 18" wheels, and these pulls were done in 4th. When I hit ~4k it really starts to take off:D All of the pulls were done after driving for 2 hours to get to the dyno then driving straight onto the dyno.

Power Mods:
VQ35 from 05 maxima with vq30 timing equipment
JWT S1 knockoff cams
JWT Pop charger
JWT ecu
OBX headers
Cattman 3" cat back
NWP spacers and BOP
VAFCII

So how much you make on my phone can't see

So how much you make on my phone can't see

peak was ~264/248

Your A/F was crazy lean up top. Good thing you did some tuning. What is your JWT tuned for?

I had to crank my base fuel pressure up to 46 psi (vac source hooked up) was at 38 psi on the first pull, to get enough fuel up top. VAFCII corrections did not help when + fuel.


JWT ecu=1996 auto n/a program, nothing special

I couldn't imagine even at my power level, having the same power in my 4th gen's body.

That has got to be fun.

Also, re: the lean AFR, 96sleeper and I believe maybe a couple of other members also noted the JWT NA tune to be scary lean.


Also, regarding your fuel limitations, 96sleeper also found he needed an upgraded fuel pump to accommodate the added air. His FP was OEM and wasn't doing the job. He also added +25-27% fuel with no difference in AFR.

Love seeing a backyard build turn out like this. Awseom!

^sent you files.

Since my swap I have not been exactly sure where fuel pressure shoule be. Some say stock fourth gen some say stock 5th gen. I had ironed out 3-5k tune on the dyno at ~38 psi fuel pressure....then I realized that adding fuel on the VAFCII was not doing anything (which taking fuel away worked great)....so I had to re do everything. Turning my fuel pressure up to ~42 psi showed some improvement but I was still going lean up top. So I cranked it up 4 more psi and went from there. I am very rich a partial throttle now, but as you can see I was able to get a decent a/f tune. The line at the bottom is set at 12.8. Also, it is common thinking that leaner is more powerful, my dyno shows that does not always prove it's self to be true on these engines.

as for the fuel pump I am still running a Walbro 255 since my car used to be supercharged, so I should be good there.

Thanks man. I spent a lot of time on this and I am glad to finally get some results!

Ahh I see ... your fuel pump is not the problem. .. hehe.

What injectors are you rocking?

Thanks for the files, and lately, it does seem that way.

I'm headed back to the dyno in about a week and a half and am going to give 12.8 a whirl, richen it up a bit and see if that helps me. I'd be happy to break 250.

I also think a full on, bonafyde SSIM would help your set-up too with that rev limit and those cams. Any thoughts of a larger MAF housing?

Awesome keep up the great work love to see threads like this keeps me motivated maybe ill put my secrets out there on my car when I'm done

nice!!! nevermind my other post.. i hadnt seen this

I am on stock 3.5 injectors.

I am not done n/a. This is just what I have right now. I needed a starting point. I plan on doing a SSIM, is there an actual write up on how to do this properly? I have a larger maf housing that Morph(don't remember his full name) made me a while ago I just have never used it. When I do use it I would want to swap in a z32 element, it currently has an A32 element installed.

Thanks man, I'm trying:cool:

Good job man. Looks like you got a healthy motor. Hows the n/a power delivery compare to the S/C?

Thanks man. The power delivery is different, the 3.5 is very torquey, the supercharger was not as torquey, but it pulled harder up top. At this point it's hard to imagine the supercharger on top of this...it will be fun:laugh:

I've done one SSIM so far and I used a sawzall to cut as much of the shelf out as I could. Then just use a dremal to smooth the edges out.

Great numbers bruh....makes me want a 35 even more!! What does the rest of the laundry list look like from here?

Did you take pictures of what you did? Did you gain power (dyno or track times)? If you took any pictures can you shoot them over to my email?


Thanks.

As for n/a I want to do a SSIM, and I may alter the intake piping size....other than tuning, that's about it. If you did not read my build thread I plan on maximizing this set up, then I will supercharge it. I already own everything I need to supercharge this set up, but I want to run FMIC when I do, so that along with the piping are the only things I still need to pick up.

I always take pics lol. I'll send some over. We did it right after we ran our PB with our 3.5 then the radiator support broke and we never got to try it.

Nice. Im heading to your thread now.

http://forums.maxima.org/dyno-discus...f-set-ups.html


will give you an idea about the gains, helped 6-10 average whp during drop of, really didnt do much for peak , but it helps , you with cams should get better results

Yeah, I have looked at your thread a few times. It's a good reference, but I am thinking my engine should flow air a little bit better than yours (read: cams and headers). I would love to hit 280 peak hp and gain a little more under the curve. I would also like to know what my engine puts down currently when it is not heat soaked. Like I stated before I drove 2 hours to get to the dyno, the dove straight on to the dyno and these are the numbers I made.

This set-up seems quite similar:

96sleeper
Mod List:
http://memimage.cardomain.net/member...67_26_full.jpg

http://forums.maxima.org/dyno-discus...all-motor.html

With our new modernized mods ( ;) ) I think you can definitely be at 280 peak.

I had never looked at his n/a dyno...thanks for that. When I am boosted I will have a very simlar set up to what he had. I have the injectors that were in his car along with the JWT ecu he was running.

I know the 3 inch flows really well but I wonder how much you would gain with a cutout. We've decided to keep our stock exhaust and run an electric one this year.

maybe one or 2 hp if u lucky.....3" is the way 2 go

It would be nice to see a real comparison. I'm sure it will be right around there though.

i would be interested in seeing this setup with some headers and custom y pipe like the one meximax was running, the 2.5 in y on the obx's im convinced rob some power

The = length OBX? I have em. Gained a gob of low and mid. Barely lost top end. Power moved left.

nice to see all this 4thgen modding... awesome.

good numbers

yeah, they are the 3.5 obx headers

Thanks

Thanks, I hope to make a higher peak number once I install a SSIM.

Hella nice power....:D

Super... We are on the same boat here.. Good luck!

U need a ssim.....

I have one...just not installed.:laugh: I will be installing that along with a larger maf housing and larger intake tubing. I thought it would have been done a while ago....but life kinda gets in the way

O man...that's good .can't wait to see the numbers..especially when u pit the v2 back on

the secret is not in the sauce

The red line is with the SSIM, blue is previous best. The only things that have changed since the last dyno are the SSIM, and now I am on 16" wheels and tires. WTF????

Attachment 40542

this baffles me.....you are the only person i have seen this happen to.

u lost horsepower but still gained almost 3mph in the 1/4 mile and picked up 4 tenths....

if u magically lost 13 whp you shouldve ran slower than u did with the 18s

That's the only thing that has me wondering WTF? I almost wish I was running the same tires at the track both time so I would know if I truly was loosing power. But at this point I don't know if the increase in MPH was going to a smaller wheel tire combo....or if I really did gain power but it did not show up on the dyno. I know the butt dyno feels like the car is slower with the SSIM... With the stock manifold on when I would hit 4k the car would push you back in the seat....that feeling is not as drastic with the SSIM....not sure if I really lost power or if the power delivery is smoother.