1998 with a 3.5 swap - Maxima Forums

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1998 with a 3.5 swap

Old 05-03-2011, 11:39 AM
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1998 with a 3.5 swap




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 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
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Old 05-03-2011, 01:51 PM
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So how much you make on my phone can't see
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Old 05-03-2011, 02:14 PM
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So how much you make on my phone can't see
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Old 05-03-2011, 02:28 PM
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peak was ~264/248
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Old 05-03-2011, 02:46 PM
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Your A/F was crazy lean up top. Good thing you did some tuning. What is your JWT tuned for?
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Old 05-03-2011, 03:02 PM
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Originally Posted by ajcool2 View Post
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
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Old 05-03-2011, 03:03 PM
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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.
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Old 05-03-2011, 03:37 PM
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Love seeing a backyard build turn out like this. Awseom!
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Old 05-03-2011, 04:29 PM
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Originally Posted by NmexMAX View Post
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.
^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.

Originally Posted by bamboomerang View Post
Love seeing a backyard build turn out like this. Awseom!
Thanks man. I spent a lot of time on this and I am glad to finally get some results!
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Old 05-03-2011, 05:12 PM
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Originally Posted by cardana24 View Post
^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.

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?
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Old 05-03-2011, 06:11 PM
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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
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Old 05-03-2011, 07:30 PM
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nice!!! nevermind my other post.. i hadnt seen this
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Old 05-03-2011, 08:51 PM
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Originally Posted by NmexMAX View Post
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?
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.

Originally Posted by JonBlz View Post
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
Thanks man, I'm trying
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Old 05-03-2011, 08:55 PM
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Good job man. Looks like you got a healthy motor. Hows the n/a power delivery compare to the S/C?
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Old 05-04-2011, 06:36 AM
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Originally Posted by ampire View Post
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
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Old 05-04-2011, 09:48 AM
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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.
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Old 05-04-2011, 09:58 AM
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Great numbers bruh....makes me want a 35 even more!! What does the rest of the laundry list look like from here?
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Old 05-04-2011, 10:02 AM
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Originally Posted by ajcool2 View Post
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.
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?


Originally Posted by VQ'rInWLA View Post
Great numbers bruh....makes me want a 35 even more!! What does the rest of the laundry list look like from here?
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.
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Old 05-04-2011, 10:11 AM
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Originally Posted by cardana24 View Post
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?
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.
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Old 05-04-2011, 10:30 AM
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Nice. Im heading to your thread now.
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Old 05-05-2011, 12:00 AM
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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
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Old 05-05-2011, 07:47 AM
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Originally Posted by aic96max View Post
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.
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Old 05-05-2011, 09:23 AM
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This set-up seems quite similar:

96sleeper
Mod List:
Engine mods on the 3.5:
JWT hybrid intake
ported MAF sensor
70mm TB
A33 IM modded
JDM cams (same specs as JWT)
test pipe
2.5 inch electric exhaust cutout in test pipe
2.5 b-pipe
hooker muffler
JWT VQ30 ecu with 7000rpm redline
UR underdrive pulley
Spec stage 2 clutch/stock 4th gen flywheel
cattman headers
adjustable fpr

SAFC II/zeitronix WB02 tune


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

With our new modernized mods ( ) I think you can definitely be at 280 peak.
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Old 05-05-2011, 09:39 AM
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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.
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Old 05-05-2011, 10:18 AM
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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.
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Old 05-13-2011, 04:53 AM
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Originally Posted by ajcool2 View Post
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
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Old 05-13-2011, 09:55 AM
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Originally Posted by datdude20 View Post
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.
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Old 05-13-2011, 10:27 PM
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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
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Old 05-13-2011, 11:25 PM
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The = length OBX? I have em. Gained a gob of low and mid. Barely lost top end. Power moved left.
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Old 06-05-2011, 03:02 PM
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nice to see all this 4thgen modding... awesome.
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Old 06-14-2011, 05:51 PM
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good numbers
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Old 06-15-2011, 07:18 AM
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Originally Posted by VQ'rInWLA View Post
The = length OBX? I have em. Gained a gob of low and mid. Barely lost top end. Power moved left.
yeah, they are the 3.5 obx headers

Originally Posted by HomerMAC View Post
nice to see all this 4thgen modding... awesome.
Thanks

Originally Posted by JAMAICANLOVRBOY View Post
good numbers
Thanks, I hope to make a higher peak number once I install a SSIM.
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Old 06-15-2011, 02:40 PM
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Hella nice power....
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Old 05-09-2012, 04:39 PM
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Super... We are on the same boat here.. Good luck!
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Old 05-10-2012, 05:19 AM
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U need a ssim.....
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Old 05-10-2012, 08:07 AM
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Originally Posted by datdude20 View Post
U need a ssim.....
I have one...just not installed. 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
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Old 05-11-2012, 10:10 AM
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Originally Posted by cardana24 View Post
I have one...just not installed. 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
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Old 10-10-2012, 09:01 AM
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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????

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Old 10-10-2012, 09:14 AM
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Originally Posted by cardana24 View Post
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????

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
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Old 10-10-2012, 09:26 AM
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Originally Posted by datdude20 View Post
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.
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