Waiting on you jay


BTW the cobra made ~450 WHP

 

What's new since last dyno?

 

ooh **** he made that much power. SOmething is not right!. I got my numbers in. Lets just say I made 372torque on one run only

 

Here they are


Lesson learn, I bumped up the PSI to 9.9PSI trying to be a bit consertive and ended up with 13PSI that was my last run too 372tq, I let off at 13 PSI and regunned it and my HP went down dramatically. This boost controller holds off very steady. I have the runs on video

 

heres 2nd best run. My first run was 349 and 338tq @ 9.7PSI.

 

For a minute I thought that 442hp dyno was yours. I was like WTF!

 

Well @ 4000 rpm your making 250 WHP.. that's great.


I see your mevi was not working either

with your mevi working you'd hit 400 right at redline I bet.


BTW, did you get a/f?

 

how can you tell my MEVI was not working? If it is not I am going to be highly pist off Ill check it right quick. Ill order something else other then a Harlan.

 

I am fully spooled at 38K. I saw it on the dyno today. I also did one run with dixit and he showed me the complete boost at 38K. My MEVI is working but does not open til 5350 which explains the flat part. Time for another RPM switch. POS harlan. I think I fried it though hooked up a wrong wire by mistake, this past weekend. I am starting to see a trend with these turbos too. Look at how this t4 stays flat and then drops out of the power band torque wise. Hmmmm, I guess I may have just wasted my money on some crap that I ordered for it. Low end torque or high end torque. I have to make a decision. Ill make it next year.

 

Man I have a VERY HARD TIME beliving that your mevi opened during your runs, but I swear I see the switchover.

IIRC there should be zero drop on the end... Hmmm...

I'll get back to you

 

I'd be willing to bet your MEVI was not working on that dyno run you have scanned. Your HP is dropping and that's on an FI car, the HP doesn't even drop off on an NA car like it does in your FI dyno, even taking it out to 7200rpm.

 

Nice numbers! I wanna see the vids!

 

Why did you get big boost spike?

 

Exactly.. but there are several things I was thinking.

He could be maxxing out his MEVI with the amount of air flow form the turbo, which I doubt.

His TB could be the cause of it.

His boost controller seems to not be pulling boost, but it could have been.

Jaime, I was looking at your other dyno's and ramius's dynos. This is the 1st one between yo and him that have NOT had the boost spike wave at the end.

What I am trying to look at is the DIVE in power. Again, it's like something has reached it's limits. Maybe the TB/MAF are the bottle necks in the equation.

It'll be interesting to see, if I can ever get 9 psi, the difference in the 2

 

I bumped the BC from 9.7 to 9.9, bad move on my last run forgot the da.m thing has to relearn itself. Fck it, 349HP and 338TQ is alot in mid range RPMS More then the measley SCer

 

this was my last dyno run. Maybe the freaking MEVI crapped on me, I dunno

 

Your MEVI looks ok... The curve looks about right for a MEVI car. HP>Torque...a sign the MEVI is doing its job and opening. USDM manifold Maximas usually don't make any more power past 5500. It looks like you're holding torque up enough to squeeze an extra 25hp past torque peak. If you were stuck on the torqueless set of runners you would experience even greater drop off. From what I've seen MEVI cars lose torque in the top end, just less than USDM ones. The MEVI isn't magically able to hold torque constant all the way to redline. 5th Gen Max's run roughly the same and Y2Kev's car has similar levels of drop off in the top end.

You might be hitting the limits of the MAF. If it's reading a full 5 volts the car is probably just dumping fuel at that point. If you're still running the AFC it might not be able to adjust safely past that point. You have any A/F ratios on those runs? Your FPR could be dumping fuel at that point causing you to lose some hp in the top end.

You can see it's a lot different than US manifold equipped cars where torque falls off much more sharply.

Here's an old plot of Shadow's and Bag's cars. They're at lower psi levels but the shape will remain similar at higher boost levels.

 

comparing that graph to the one you posted first, you lost about 25whp from 6000-6500 on the first graph. on this one you lose like 8hp.

 

another difference I forgot to post is the fact that on that run I had a 2.5 inch exhaust. On these new runs I have a 3 inch exhaust and a good motor. I may install the Z32 MAF I have in my garage and go redyno and see if thats the issue. I am also going to go with a Summit RPM switch. If that doesnt solve the drop off mystery I have two more ideas that may solve this crazy mystery.

 

Profec EO1 boost controller and Greddy Emanage.

 

What kind of a dyno is that, just cause dynos varry so much.

 

its a dyno jet, its two runs plotted on one graph.

 

Which run did you have the 2.5" exhaust on?

 

I have the problem of the MAF maxing out and my high-end looks very similar to yours, Jaime.

I have the Z32 MAF and chip for the JWT for it, but haven't been able to get it to work on the charged side and don't yet have the piping made for the non-charged side (it has to be 18" from the inlet).

Stephen Max and now Delio have gotten it to work on the chartged side - how - I don't know - their wiring is the same as mine, and I've tested my MAF on an actual 300z - works fine.

But because I lean out too much up top, I drop just like you showed in your second Dyno. You can see in the Red run I reset the ECU, putting it into safe mode and making the A/F ratio better on the top end - I gained 10hp.

 

Nice numbers Jamie!

 

Neal the run white sheet that reads 325HP and 308lbs of torque. I had stock injectors and 2.5 inch exhaust.




Ian if your dyno looks similar then I am not going to worry too much about it. I do have a Z32 MAF but have not installed it. My setup has the MAF on the non charged side, just have to bolt it up and go redyno again. Dont know if I am going to do that. I was going to change something else on this turbo setup. But since I am going to Iraq pretty soon, why mess with the car. Is pointless. I dont have a greed to hit 400HP. Believe me 350HP/338lbs of torque is plenty to pull on many cars. Hell the only reason I redynoed is to see what I was making since I kept up with that SCed Cobra. He had to go dyno since I kept up with him thinking his car broke down or something.



Matt thanks!

 

Ok that is what i thought you meant. I would think that opening up the ehxaust would give the car more power up top (meaning there would be less of an HP drop) but maybe there is some other bottleneck that is coming into play and is hurting it in that last few hundred rpm or something, or maybe it's just a difference in the tuning now that you are running different injectors. I won't pretend to know the intricacies of tuning and dealing with FI because I have only a very rudimentary knowledge of it, just struck me as odd that there would be more of an HP drop when you are running a larger exhaust than before.

 

You know the weird thing is that I am pushing 9.7PSI. Same PSI I used with the 325HP dyno. I gained 24HP and 31lbs of torque with good motor and 3 inch exhaust. Why my dyno dips down like that has me clueless. Ill install my test pipe again and see what happens. I just dont like the smell it releases when I am at idle at the light. I get nautious at timesuke:. I ll tell you guys what, that freaking turbo hits hard them a mcker from mid range all the way to redline. I took a SCed member on a ride. His first response was, is my car going to be as fast as this one? how much slower is my going to be? Bad move on my part, but he now knows what a turbo max feels like . Should have never did that since he just got his blower in.

 

hey jay why dont you let me babysit your car while your in Iraq
BTW: when are you leaving, good luck man

 

Im wondering... Im looking at the Cobra's dyno and the Maximas... And you say they have similar peak tq numbers... but since you have a turbo, you should definately be able to beat out his parasitic S/C, which also doesnt make full boost until redline (unless its a roots design). Now I look at the maxima dyno, and your torque drops like CRAZY after 5500 rpm... Even The CSC S/Ced maxs TQ curves look better than that. Now is this drop because of The intake design?? Or bad flowing heads? Or the exhuast? Or is it the turbo that cant keep up at high rpms? If you could maintain that peak torque through your 6500 revs, damn that would be bad ***! definately over 400 whp on a 3000 lb platform. I would , because I would need atleast 460 whp to keep up..

 

that is the $1,000,000 question.

I seriously doubt it's the turbo. It's good for ~500 WHP

The exhaust is 3inch, so I don't thinik that's the problem.

Inatke, maybe... maybe there is to much air.

Heads, maybe again to much air.

But TQ drops off the closer you get to redline. It happens in LOTS of cars.

I'd take ~275wtq and ~325whp @ redline. When you upshift, you'll fall right into the fat part of the hp curve and ride it to redline again.

and with 300+ lbs of tq frmo 4000-6000 rpm... sounds good to me

 

I believe that torque is normal. Even with 3 inch Charged piping look at the drop on this Dyno. I thought it was higher or something. One thing I can tell you is the car just keeps hauling even if you see that torque curve drop at 55K.

 

heres a dyno graph of Bags turbo when it was broken, How ever he has a .58AR T3 turbo. Myself and Ramius have T4 .81 AR.

 

Those numbers are very good, but I also believe there is something knocking down the numbers a bit at the high end. The stock MAF for you guys is good until what...350~ish HP? But is that 350 crank or wheel HP?

 

350 at the crank. When I was dynoing 268 whp, my MAF was already at ~4.9V. That equated to around 335 at the crank assuming ~20% loss with my auto tranny. Now at 301 whp, the MAF is maxing out.

 

[QUOTE=JAY25]heres a dyno graph of Bags turbo when it was broken, How ever he has a .58AR T3 turbo. Myself and Ramius have T4 .81 AR.

um you might want to recheck that turbine size because to my knoledge they dont make a T3 turbine with a .58 A/R . the min size T3 turbine for a max would be minimum of .63 A/R

they do however make a T4 turbine with a .58 A/R, i believe mardigras is changing to this

 

[QUOTE=subs1000w]
T3 .58 is what bags has. I am dropping to a .69, wont be able to enjoy until I get back next year.

 

You should still be happy you are laying down those numbers in a sleepr.

 

jay, he's right.. I am running .63 , I probbly said I was running a .58.. my fault

 

I need to go cancel that .69 order then. Thats if its not on its way already.