I think my power is about right for 6PSI.

But my point is I should be making MORE than 6PSI, especially if Loren got 9 on a regular basis, with the exact same SC as he tells me.

IanS

 

Ian, I may not have a lot of time tomorrow, but I'll get the vacuum gauge to ya, gimme a call after 10am... I'll probably be in Bellevue around noon...

 

I know your days off are funny, but I HAVE to be there at least part of the time to help with your 5-spd conversion.

I'll give ya a call tomorrow.

IanS

 

my sig isnt my car. its phil96se's that he sold a couple weeks ago. becuz of his cams and internals his car idles at -18 on the boost guage . when we were drivin around in it i just had to keep that has a memory for u wont be seein that very often.

 

Strange. I idle at -17.

Mtrai idles at -22.

Loren at -24.

Maybe it means nothing.....maybe it means something. I've asked this before, but does anyone know if -17 is normal? The nissan techs tell me it is, but now I'm starting to doubt them.

IanS

 

Mine idled at -18 IIRC when I had my Autometer boost/vacuum gauge... It hardly ever went past -20 unless I was decelerating.

I didn't read back too many pages but let me throw in my 0.02
Keep your car the way it is until you're ready to convert to the V2 as others have suggested. Although you could redo the stock pulley/belt/plug the oil line/etc... why do it until you need too?

If you haven't already used a 2nd or 3rd boost gauge to check, you should.

BTW - the pulley size is printed on the edge of the pulley...

 

Ian, we can pull your S/C, put it on my car, and see if it still only makes 6psi of boost, then you'll know if it's the S/C or not without spending any more money, I'm auto still, your auto, eh? J/P

 

I highly doubt Vortech would taken a broken V1 in trade for a V2 at their $700 deal. I'd have to get the V1 fixed first.

And if it only cost $300-$400 to fix the V1 and make it quieter, I'd rather have that, because V1's are supposedly more reliable, and I'd save $$$.

IanS

 

Well V1's are certainly better if you start swapping pulleys out!

 

Wrong...I had a Greddy catback when I dyno'd. I've always had a Greddy. That was my very 1st mod.

 

One more thing. Your car dyno'd lower than mine did NA. I had the Greddy and a Stillen intake which gave 159 fwhp. While you had the MEVI, intake, and y-pipe and that gave you 155 fwhp. Maybe your car isn't as strong out of the box. Tony(1Max2NV) had lower numbers than I did and he had a lot of mods (you can check out his dyno in the dyno forum).

 

Understood. But the MEVI does not add any hp to a NA car, it only extends the powerband.

Even so, my 155fwhp shouldn't make it so that I'm as far below everyone else with SC as I am. I'm missing up to 39hp, and at least 25, dpeending on how you calculate it. And of course, the 3PSI.

IanS

 

if i remember correctly.. Jane's dyno numbers were not the average dyno numbers for a SC Auto Max.. her numbers were a tad bit higher.. i think its the special sauce kevin is putting in the gas tank at night

 

She also has waterinjection and stuff.

 

This has gotten too complicated.

I am going to compare to Loren's car because this is the exact same SC.

Loren got 290hp at the wheels. He has a stick and Catback. He was a little freakish, so let's say 280 for the sake of argument.

I get 231 at the wheels with the same mods without a Catback, and Auto.

Transmission and Catback does not affect PSI adversely. Loren got 9 PSI, I'm getting 6.

There is NO WAY being Auto and not having a Catback is giving me a loss off 49hp and 3PSI! (Saying Loren got 280, not 290hp, of course)

That, even being conservative with Loren's numbers, is a 21.21% loss below a stick with Catback. No way.

Also, Loren tells me he only gained +7hp with a CatBack system. He Dynoed at 283 without the CatBack.

And you guys only talk about hp, only one or two people have tried to give any explanation on the boost. -3PSI, even on the Dyno in 3rd gear, with a running start, is 1/3 less than what Loren got, and at least 2 less than others with the same Pulley and Tranny get.

While some of you have great theories, I still don't think anything that's been said explains away 3PSI and 49, up to 59, horses.

Loren agrees with me on this. He thinks I should be at 290 with the MEVi, and 255-260 without.

Anyway, I'm getting it rebuilt when I get the money. Why not? If there's nothing wrong with it, I may trade if for a V2 anyway.

IanS

 

Loren's dyno's are ridculous. No way a NA 4th gen with those mods makes 190.

Also I don't think 49 HP for catback and auto is too far off, it's probably like 35 or something. My car NA put fdown 180 with Stillen/CAI Hybrid, Ypipe, RT Cat, Greddy Exhaust, and that was like record breaking for a 97-99 at stillen. Wherever you all are getting your dyno's is freakish. Cheston has the same setup I have now with the 3.125 and he's making like 275. I saw a 95 with the same mods I have put down 255. I should get my friend Dennis to dyno his car, he has a SC on an auto with VB, Ypipe, Cat, greddy exhaust. I'd be surprised if he got over 230HP at stock pressure.

 

Nope... 229 with 3.60" and GReddy cat-back ONLY.

190 hp with MEVI? That's 5 speed 5th gen territory, which you are not. I got 181 with CAI, y-pipe, RT cat, and UDP, so it's more realistic to compare your car to my car.

By comparing your car to Loren's car, you're heading in the wrong direction. Not trying to be mean but be an individual, not a lemming.

 

Damn fat-fingers...I meant 290 at the wheel with the SC, I have no idea what he Dynoed NA.

I edited my original post.

IanS

 

Yeah Kev's right, don't compare your car to a 5seed.

180 is about right for a 5th gen auto with those mods.

Hoon put down 200 with intake, y, exhaust but he's a 5spd.

He did put down less torque then i did though 180 vs 185 from me.

 

Also, why should I compare to you, Kev? I'm counting my numbers without the MEVI activating.

I know you're not trying to be mean....never thought you were.

Any other reasons besides the VI I should compare to you and not Loren? No matter what, having a sitck doesn't give THAT much HP.

IanS

 

Without the MEVI at 10 psi, you should be in the 250-260 range (definitely less than what MardiGrasMax was getting). With MEVI, you should be around 270-280.

Having a stick doesn't give THAT much hp? Let's see... I got 288 with my setup, jhans114 (5 speed 5th gen) got 322 with the same setup, and Daniel Chen got about 317 (5 speed 5th gen) with the same setup. So, if you had a 5 speed, you should be at where jhans114, Daniel, and MardiGrasMax are (317 with MEVI).

 

Interesting.

So I'm still missing 2-3PSI, and about 30hp. (I'm assuming 260 is about right for no MEVI, Auto, and 9PSI)

1PSI = How much HP, may be a good question. I should think a 3.25" Pulley should be giving me at least 8PSI.

IanS

 

face it. automagics are just weaker.


it could just be your tranny is so messed up that its not xfering the power like it should be. i know a few people with abused auto trannys that had mad bolt ons and didnt dyno high at all...

 

That's why this automagic is making more power than your 5 speed.

There is no true 1 psi = XX hp calculation because of marginal returns. The more boost you put in, the less power you will get per psi.

 

When doing the VB Mod, I made special attention to cleaning the magnets. The magnets has only a light dusting of metal shaving on them, and my tranny had never slipped.

After the VB Mod, my tranny feels especially strong. I've always been careful never to do any tranny drops, I change the fluid with Synthetic every 15k.

My tranny is as strong as an Ox.

I can't say why, but I have very good reasons now for thinking it's the SC causing the problem. The only thing that will tell for sure is for Vortech to take it apart and look.

If there is damage, I'll work it out with Loren. If not, then I'll just get it rebuilt anyway.

IanS

 

jhans114 has a AE

one note thought.. DMan did dyno high with his 2k Auto

 

That's why he has that extra 5 hp, right?


When he added the y-pipe, he got almost the same dyno result. I don't remember if he even went with a smaller pulley.

 

do a search.. the information is on this site.. you just have to go and look for it..

 

I couldn't agree more then this.

You got 267 WHP, that is surprisingly close to that 270 target, not to mention you have a V1 which tends to boost about 1PSI less.\

You should be around 250ish without MEVI. Well you're at 231, which is reasonable considering you have a V1 which makes that supposed 10PSI a lot closer to 8-9; not to mention your absent an exhaust and cat which has to be worth 10 WHP. Thus, take the 10 lost from the less boost and the 10 lost from the cat and exhaust and what are you left with? 230 WHP!!

We're not trying to be mean IAN, we're just trying to save you from getting a rebuild that will waste your money.

Finally, don't keep going back to this, "Then why am I only boosting 6PSI" You have given us no proof except for the possibility of a defective boost guage that you're actually making 6PSI.

 

Good point on the boost gauge. I don't really think it's broken. however, I do think there's that possibility.

Here's what I'll do:

I'll wait until I get the new boost gauge. It will only read 6PSI as well, I'm fairly confident.

If it does, this sucker's going in for a rebuild. I really would like to make it quieter anyway. I already sent Loren a mail asking him that if Vortech does find something wrong, he at least help pay for the rebuild.

If nothing's wrong, then I will pay for the entire thing.

IanS
I'll wait until my new boost guage arrives.

 

245 FWHP and 238 lb-ft

TC, VB, y-pipe, 3.60"

 

What / Who is this?

TC = ????

That seems real high for an auto, but then again maybe it was a freakish dyno.

 

ok now go find me the stock dyno...

wait he had a y pipe before the SC huh?

 

TC = Torque Convertor my friend..

 

Who is this we're talking about and what did he dyno before the SC.

I didn't know ppl put TC's on maxima's

 

DMan_2k or something like that? i can't remember.. he has a 2k Auto





i know of just two people.. Dan and Steve

 

Nope, he put on the y-pipe after the SC. The pipe didn't give him anything.

Stock dyno was around 250 hp I believe.

 

Huh? Now I have nothing to look forward to

 

You need to get a Y-Pipe and Dyno, BlackCat. Then I'll have someone fairly equal with a stock pulley to compare to.



IanS

 

Diederik is a special case. You "should" get good gains with a y-pipe.