in the shadow of Neal's beast running at the track today there was a little turbo I30 getting to the track for the first time.

Was not sure what to expect. Not alot of turbo guys have posted track results, especially low boost #'s.

Took a couple runs to get used to running the 1/4 mile boosted. Did alot of bouncing off the rev-limiter.

Car felt great for the most part, clutch held awesome, but I am having a definate issue that is hurting my ET's/traps. On every run when I shift into 4th I would get a hesitation/bucking/stutter type feeling that lasts a solid 1.5 - 2 sec. It happens right as I lay back into the throttle and relase the clutch on the 3rd to 4th shift. It even happend a couple times in 3rd as well and it showed with low trap speeds.

The car used to do this when I was NA, but it was very seldom and rarely happend at the track. I used to think it was my findanza flywheel for some reason but now I think it might be a MAF issue.

Anyway, here are a couple of the better runs. Never did get a totally clean run it without the bucking or missing 4th (was doing for some reason too)


I30t 5spd
Straight T4 @ 5psi
3" downpipe


60' 2.260
1/8 8.878
mph 81.22
1/4 13.78
mph 101.80

60' 2.048
1/8 8.895
mph 80.92
1/4 13.76
mph 100.68 (missed 4th on this run)



I had never ran at this track before so don't know if it is on the fast side or the slow side.

I was fairly happy with the ET's but not with the traps. I really think the hesitation is sucking out a couple mph. I don't like my power curve at all. I really want to get an MEVI. I make decent peak hp and tq but my curve is not real pretty. The last 500 rpm's I am at like 200hp.

Well, at least I got a place to start. Now to turn up the boost

 

nice numbers mike!

what fp were you seeing after the shift?

do you want to try my maf?

 

Nice numbers mike!

Every thing just gets better form hear, Have fun turnning up that boost

 

Wow, awesome numbers Mike! I only hope to be running as fast as you are. Yeah, I think you are right on the MAF issue, I had similar problems before I relocated mine. As for OC, its a slow track. I was trapping 90 mph all day long there, and when I went to US-41, I trapped at 93. My guess is that those numbers would be closer to 13.5 had you been at a better track.

 

Wow man I know everyone must tell you but you've got the best looking 3rd gen ever. It's no

Nice times Mike. Were you on drag radials? I agree that your traps are low but your 4th gear hold off must be killing you.

Hope you can get that Mevi soon

 

That's a pretty nice # since you're having trouble with hesitation on 3-4 shift,if you get that fix,you're easily running mid 13.

 

Yhea, I was on my DR's. Still can't pull real low 60' on them

 

Have you thought about installing an 00vi, Mike?

 

Your second run puzzles me....A much better 60' but still yeilded the same 1/8th ET which is quite strange. It looks as if you would have nailed at least a 13.6 on that run with hitting 4th but the 1/8th ET is strange. With matching the 1st runs 1/8th ET with the 60' of the 2nd run I would have expected an 8.6 or better just from the better 60'. Anywho congrats on running the car down the track to get some baseline numbers and I hope you get all the kinks worked out soon.

Matt

 

That bucking sounds like what many fidanza owners have described. What makes you think it is the MAF, when your tune on the dyno was perfect?

 

there is a bend right before the maf and its on the charged side. it could very well be. Mike i also have a length of powdercoated 2.5 pipe that is about the length of a maf if you want to try to run it on the intake side.

 

I also have had the 'bucking' issue in the past when going into third and fourth gear. I had this problem when I was N/A and I still have it now that I am boosted. I really think it has to do with the fidanza flywheel. I usually notice the bucking at lower rpm shifts....when I ran at the track I did not notice any bucking when shifting at redline.

 

Why would a lighter flywheel cause bucking? I don't quite get it...

 

I've never understood the logic behind this either.

I haven't had that problem at all after installing a Fidanza on my engine.

 

It doesn't make sense that it would be the lighter flywheel causing this.

Also, I'm running an oem flywheel - and I've had the bucking issue when shifting the higher gears - it is definately more pronounced though with the boost. I think it has been amplified due to the extra fuel being dumped in during shifts.

 

thats the thing....none of us have figured out why this would cause the bucking. The thing is all of us who have installed them other than a few have had the bucking/stuttering issue. If you search, either the fourth gen or general discussion you will find the thread...I think it was started by Matty

 

Very nice, and at only 5psi? You've got a lot to look forward to!

allen

 

I have a feeling its the Fidanza doing that as well...I have had the same issue even when I was N/A...it has something to do with the friction surface on the flywheel cause I made a post about this issue a while back, and got alot of imput from peopel with the same issue..

It only happens to me when I FAST shift from 2nd to 3rd or 3rd to 4th...or even blip the throttle when im cruizing, I got a stumble in the entire car...Very Strange

-matt

 

t3/t4 turbo @ 7 psi
USIM
3 inch exhaust
5-spd



r/t .776
60' 2.500
330 6.507
1/8 9.626
mph 80.28
1000 12.249
1/4 14.473
mph 101.64

 

Same here.. and NA, I don't have the issue either

 

I have to stay CEL free to get emmisions tested in IL and as far as I know that is not possible with the 00VI. I have also had an MEVI in the past and liked the ease of use/install of it.

But I do have a 4th gen lower intake manifold I can use off my old motor to make a 00VI install easier. If I am wrong about the CEL stuff let me know and it might be a possibility.

 

Yhea I know. Things were kinda all over the place. I ran one run at 13.8 @ 98mph w/ a 2.1 60' but that was a run with really bad hesitation in 3rd and 4th.

I think some of it has to do with heat soak, bogging off the launch, bouncing off the rev limiter in 1st, and playing with different shift points.

Things were much more consistant when I way NA. I knew if I hit X.xx 60' then I would basically run an XX.x ET. It was not like that yesterday at all. My first run was the 13.7 w/ the 2.26 60'. After that run I though I would hit a 13.4 for sure when I started pulling better 60'. But it did not work like that.

 

I don't know anything for sure but it has been something I always suspected. I never got the hesitation before the fidanza. It just does not feel like a motor type stumble....I just thought it was maybe the friction surface and the clutch surface not liking each other in certain cirumstances.

My fuel pressure stays normal when it happnens.

I need to go out one night and keep an eye on my MAF voltage and see it it jumps around on me.

I don't think it has to do with the bend before the MAF since it used to do it when I was NA and there was no bend at all.

 

yeah, but now youre pushing much more air. we can try it sometime later this week if you have time.

 

mike i never had cels with my 00vi not once but i did the install the way to keep everything happy . the other way people do it is the cheapest way for there wallet and thats a big no no...

 

How do you keep everything happy ?? I want my low to mid range back

-matt

 

Steve, it would make sense for you to just bring your MAF on Sat. to eliminate that possibility.

I never heard this stuff about the Fidanza before. I'm glad I got an OEM.

Also, I'm bringing my Auterra. If really needed I'll pull the cable outta the dash.

 

i dont think that mike is coming on saturday cuz he has to work.

 

What big differences does running the MAF on the charged side or non-charged side do? Is one place a better position for it?

 

if youre running hi boost, i wouldnt want a little sensor dangling in the middle of the charge piping.

 

The SR-20 guys run the MAF on the charged side sometimes. They say you get better throttle response like that. A bend will mess things up though, it did for me.

 

You can't blame the Fidanza unless it happens to everybody that has one. There are too many people who have had no problems with it.

It may be an installation issue. I wonder if the stumbling thing is a result of the timing ring (that the crankshaft position sensor reads) being very slightly out of position. For instance, if the flywheel wasn't fully seated on the crankshaft.

 

If your talking about losses, a dangling sensor is going to affect air flow the same no matter whether it is before or after the blower. Air flow rate is the same everywhere in the intake tract.

 

I meant that I would like something sturdier if I am pushing 15 psi with a turbo. Not to say that you haven't had success with running your z maf on the charged side, but I think that the difference in the power curves that the turbo produces puts one more at risk at running a maf on the charged side. The 5th gen maf is on the non charged side for the Stillen kit because it is weak. They had to add 4 feet of piping to get around Nissan's engineering. OEM on the z, the maf is on the non charged side isnt it? They probably put it there for a reason.

 

Congrats on the new best and turbo setup, Mike.

I hope you can get everything sorted out with the car. I know that there's nothing more annoying than some problem that appears randomly and makes trouble shooting a nightmare. I'd have to agree with the majority, tkae a hard look at that flywheel because this problem does seem to afflict many Fidanza equipped cars. Not all, but many.

 

Valid concerns. I thought you were talking about flow obstruction.

 

Benefit of a MAF on the charged side is that it's metering air after your BOV. Car won't stall when you let off under boost and the BOV releases air. Downside is that on 5th gens, the MAF will fail if put on the charged side. Doesn't seem to happen to 4th gens. It's why Stillen has the MAF on the charged side for 4th gens and non charged side on 5th gens.

Benefit to running the MAF on the non charged side is it might be more reliable. Downside is if you vent your BOV to atmosphere, you have to use the antistall feature in a SAFC or emanage or your car will stall when you let off the gas.

 

I had my BOV venting to atmosphere for a couple of days and I never had a stalling issue. It would backfire sometimes if i reved in neutral and when driving the car did feel a little slower also. I put it back to recirculating because you couldn't even really hear the BOV on my car anyways .

 

Doesn't stall every time, you have to be flowing enough air and then back off hard for it to do it, but it will happen. I've ridden in turbo cars that would stall at 70mph on the highway after backing off, really kind of amusing.

 

I hardly ever get on the throttle because i mostly drive like a grandma. I guess thats why i didn't really have a problem