Ok looking at boosting an auto and I know to get the VB mod tranny cooler and what not. But my question is you guys say that a auto tranny only holds for so long with a SC. A SC uses more boost to get more HP. I noticed that a turbo uses 4 psi and got more hp then a SC using 10 psi. Also would using a turbo on an auto be less harmfull since using less boost to get more HP. Please fill me in some more.

 

Uhh, I don't think so. Not even close. JAY25 is putting down 321fwhp @ 10psi with his Stillen Vortech V2.

As far as peak HP goes, I don't think any turbo here is going to make a lot more then the stillen s/c. Now, when and where it makes that power is a different story. So is the torque difference.

 

 

What kind of Turbo is that? What other mods does he have? 274whp for 10psi in a Max is low. A catback would yeild 10-15whp/wtq, but it has a Y so The CustomMaxima turbo puts out around 225whp@4psi if I remember correctly.

 

PFI's kit

 

Hello

You are reading the graph incorrectly. The 274HP @ 10 psi is for a Stillen Supercharger. The PFI kit got 267 HP at 4 psi. Please take a look at it again.

 

225whp for CustomMaxima's kit.

 

75+ shot (assuming 4th gen)

 

I noticed that but my point is the turbo takes less psi then a sc to make close to the same power correct. So the tranny would hold better with a turbo then a SC right.

 

Power is power, psi doesn't mean anything then. The Turbo is going to break more things then the Super becuase it makes more torque, plus the power curve is much more linear with a supercharger.

 

Well it only takes what, ~6hp to spin the blower? Around 2900rpm is where I start building boost. But the Supercharger has no lag like the Turbo, just delivers a smooth strand of boost, rpm dependant on how much PSI your running. And it's hp/psi ratio is what, 11-12hp/1psi?

SeximaGTR told me he races turbo cars He always pulls right when the race begins, becuase the turbo's lag and need a second or two for the exhaust to spool them up.

I took 99maxima5sp for a ride today in my car. He said it felt quicker then his friends AWD Talon 5spd @20psi. I hit about 9.5-10psi at redline (untuned). IMO people (including me) knock the Stillen V1/V2 supercharger too much. You can still feel the power pinning you in your seat, it's just smooth. I think of it like a roller coaster that gets faster and faster as you go along the track. The turbo is more like "the incredible hulk" rollercoaster, where it kinda chucks you into the power all at once.


Cliffs Notes: Superchargers haul @ss too, It can put a huge on your face, and finally, "I am supercharger, hear me roar"

 

Craig-see below

myownnismo-The problem is your comparing a NON mevi to a MEVI car. Not apples to apples on the dyno graph

 

Show me a 10 PSI SC'D maxima putting down more than 300 HP without a MEVI

There are a few, but VERY few

 

But you have more area under the curve with a turbo. THUS more usable power


But your correct on the TQ statement, if using the MEVI for a 4th gen

 

Your correct, BUT the SC is making TQ at lower rpm's as well, it LOSSES alot of TQ when the MEVI is applied, that is how they get the HP they have.

320 WHP 260 WTQ thus the TQ loss

But let's be honest 260 WTQ is nothing to sneeze at

 

LAG? you lost me there craig...I build boost @ 2500 RPM and full boost @3500 rpm. Show me lag


It all depends on the car/turbo/driver... too many variables there.. but what about at the shift?

That is correct but misleading. Depends on the amount of boost the turbo OR SC is running.
Jay's car is like being punched in the chest

Finally, I am not bashing anyone or anything, just trying to get a few things level here.

Again you can't compare a MEVI to a NON MEVI.. it is not the same.

And I got an automatic hear me shift slow

 

It also depends on what turbo you are talking about. A standard T3/T4 turbo will start around 2500 rpms and have full boost around 3200-3500 rpms easily. But, as mostly seen here, a standard T4 will start boosting around 3200 or so and have full boost at around 4200-4500 rpms.

That is exactly why I opted for the T4 Ball-bearing turbo. It has almost the same spooling characteristcs of a T3/T4, but with much more power and much more efficiency in the high end....

 

you guys are helpfull thanks, but I just don't think I can handle spending $3,000.00 then shoving $3,000.00 on converting my tranny. I want a SC but can't handle having to convert to manual. Maybe if I get a credit increase I can think about converting to manual then SCing.

 

I also think I was making many many many ponies more than 220 fwhp with the sc hehe....Don't take any of my post as ******* on you baggs.... i just like bashing the idea that turbo is the coolest **** to hit the planet ever?!...















anyway moving on.

My experience running turbo cars with larger turbo's, aka anything bigger than a t3 really.... has been that the turbo lag kills them; Unless they're running turbo's that are matched to the motor,(which 99% of the time they aren't because whoever designed the kit is a schmuck and threw the biggest snail he could in there thinking he'd get all this sweet *** peak power lol) there is a ridiculous amount of lag. The story is the same, time after time, that unless they are spraying to get the turbo spooling with a small shot, I pulled on them until the midrange rpm's, then they start walking near the top. To give you some comparison, untuned @ 11 psi, I've run sx7r, and for a second or 2 i'll hang, his turbo spools, and by the top of 3rdish, he's got a good 5 car lengths on me.... He definately has a unique kit that no one has replicated yet. He runs more boost than me as well, and has a much more efficient turbo size than most of the turbo'd guys in this forum are running. I'm interested in how the sc will react now that the car revs much more freely now that i'm a 5spd. FYI, Thomas has a MEVI, I didn't at the time. Neither of us were tuned.

I agree with Craig on the lag, there's turbo lag... sure u may start making boost at 2500 with the turbo.... i start making boost lower than you as a matter of fact baggs.... I'm curious to how quickly ur pressure builds up.... I mean I'm out of vacuum well under 2500 rpm, but I can't ignore the fact that it takes me a few to hit 11 psi. On the other hand, you should be seeing your max alloted psi sooner than I am . It seems that the turbo isn't very efficient in its power making until it really gets spooling near the top of its alloted psi..

Look at the area in doubt, the low end, For some reason the blue part is gone, I wonder where it went?....... but it's pretty clear that the turbo isn't blowing the doors away on anything @ the lower rpms... no pun intended.

Back to the turbo itself: BB is a good way to go, but i don't like the fact that there's no way that the BB turbo will last longer than the conventional ones that are available. There is no question that they will wear out MUCH faster; i guees it's just a side effect of having boost so much quicker and having it spool quicker too. Also, a T4, even a ball bearing T4, isn't an optimal turbo for a maxima... a midsize t3/t04 would be more than sufficient..... I think there's way too much damn hype about the BB.... If you're wallet is endless and you don't mind swapping turbo's sooner then more power to ya!!!!
It's a kinda tough argument because it really depends on what trim turbo you're comparing the v1/v2 sc to.

I personally don't like the idea of a turbo going above a set psi and taking **** out along with it It kinda scares me. The sc I feel you have more control over at the top of a gear.....




Also, let's not forget the tranny issue. The auto KILLS you with the sc as i recently found out after i swapped.... just the auto lag on a sc'd max = As far as which is harder on it, it seems very logical that the turbo would tear the **** out of the low end clutches and let them slip pretty consistently on a turbo'd auto; there just isn't enough god damn line pressure. I took my auto out after running boost on it for 6 months, and to my dismay, it wasn't the torque convertor, planetary gears or any of that good stuff that died, it was the low and high clutches; they weren't designed to hold any kind of decent power on our cars. It's really a waste of time/ labor/ and money in sc'ing or turbo'ing a automatic and expecting to make some pretty numbers on the dyno/track out of it. Of course there will always be an exception to every rule, and there's guys like Jime running 13.1 on an auto with nitrous etc... but for every other guy, the tranny won't take it so easily....



Regardless though, the whole reliability crap goes down the crap when boosting an automatic. The tranny is getting torn the hell up, and doesn't work efficiently at all. If you plan on sc'ing, from my adventures with the max, i suggest swapping first, then sc'ing, it'll save you money and downtime in the long run.

Cliff's notes: Autos suck, sc's and turbo's have their places

I'm tired, I'll talk more in the morning.

 

Oh and one more thing..... Rice Juice is the solution to all low rpm problems.

 

Yes it is


And I don't take anything said here personally

Like I stated, and so did you... WE are just trying to get information out.

There is alot of misinformation on the turbo's, and I do not think it is the greatest thing since sliced bread, HOWEVER I really like it on my car.

But I have had the fortune of driving jay25's car and it is sick

 

Huh? They bought a kit from us and said they changed some things thaat they didn't like. Now we know what they didn't like about the PFI kit ... it makes too much power!

 

 

but SCs dont get full boost until redline. for turbo peeps, once you hit 3500 and the turbo will punch x amount of boost into your engine. SCs are rpm dependant.


about the auto tranny, it really depends on your driving style and the tranny's condition. if you launch at every stop light, it will die soon for sure. IMO, SC does not abuse the tranny as much as turbo for daily driving because when you pull an SC'ed max to 3500, it is still at low boost (1-2psi depends on which pulley you use).

 

Actually the only car that has a dyno on custommaximas kit had alot of issues. the car had bad compression tests before the install and he has stock exhaust. My car would have been the first to get a good dyno, but my tranny blew out on the dyno machine. My tranny is being rebuilt this week so we will have the first good dyno within 2 weeks.

 

 

Bags, have you ever driven/been in a Turbo car under high boost? (8psi+) I am curious as to what your thoughts on when comparing JAY25's supercharged beast to a hard hitting turbo maxima. If you've driven/ridden in a turbo 5spd Max, then you can please do a little comparison?

In Jay's car when you punch the gas while in 2nd gear around 3000rpm, it doesn't feel wimpy to you?

C'mon, spill the beans, I wanna know what's going on inside you head.

 

Turbos are weak so keep your SC. Nothing to learn... move along.

 

BTW... get "peak number" out of your head and compare the graphs (turbo vs. sc). Look for "area under the curves"

From Jaime's site:

 

turbo97se, what size turbo were you running when you dynoed the numbers in your sig?

 

Well KevinG, you coulda had a 10 second twin turbo beautiful Supra for the amount of mula you spend on your lovely silver lady so shhh.

If anything, Turbo's = Wam bam money gram

 

My car hit 9 PSI the other day on the higway, blew a hose off and it was nice.. I was already going 90+ , so that is my one car comparison.

My buddy has a dodge ram turbo diesel @ 35 PSI and 850 WTQ and 500 WHP that I drove and it was a beast.

But no, I have never realy driver a turbo'd car before. Jaime's car IS the fastest car I have ever driven.

And the power is smooth, until about 4000 RPM, then it is almost violent. Being a 5-spd you can stay near 5000 RPM at 3-4 shift and 4-5 shift So yeah the TQ is not at it's peak, but HP is way up there.

And feeling wimpy, NO. With how tight his throttle cable is it feels like it wants to to push harder

 

Jaime not hating on ya bro just doing a comparison.. here is my dyno with my MEVI NOT working

 

Jaime's my mod, so I don't hate on him. We've helped each other many times so he knows I respect him.

We're just showing Craiggy what each setup can do.

 

Yeah, jaime is my dog.. he has helped me in many ways .. he let me drive/use his car for my car to pass emmisons.

I have used his house to do the work on my car...

Just wanted him to know I ain't trying to FUC# with him in any way

 

where have I been I just saw this thread today, that goes to show how stressed I been. Kev and Baggs I still love ya no matter what I understand what you guys are doing. I am just happy I am coming this Friday. Baggs give me a ride when I get home I did not know you climbed to 9PSI

 

I WAS @ 9 PSI for about 5 minutes.. back to 6 PSI.

if I can get some things settled 8 PSI and SAFC are coming

 

Here is a video of a SC'd cobra VS supra...

SC VS Turbo

http://flathat.woodstream.net/Columb...TO4R_Supra.WMV





Now if I am posting a link who do you think wins?

BUT, there is 1 poin that shows truth from this video... about pulling from the start. ( in this case but it applies )

 

link doesnt woek

 

right click save as????