Ok, So I just got my Reichard Racing pulley today... It looks frickn nice... I ordered a 2.8 pulley... I am running a 3.12 pulley now and am boosting between 9 and 10 PSI with this set up... I am undecided about installing the 2.8 before getting new pistons and rods...

My question is how much more PSI would I be expected to push with a 2.8 VS the 3.12...

I want to go put this on now but I do not want to fry a ring or throw a rod thru my block...

My engine has 70K blissfull miles on her and my Vortech is nearing 15K NO ISSUE miles...


Thanks!

I'll Post pics of the pulley if anyone is interested in seeing it.

 

i'm less sure about boost psi since everyone's car is different and engine temps and ambient temps play such a big role in it with a SC, but you'd probably pick up 34-38whp and about 32-36tq at the wheels. If I had to guess, I think you'd pick up 2-2.5 psi on your car, so probably low 12's psi

My car had several runs during tuning where it made 420 on dynocomp's dynodynamics dyno with 10 psi and I'm still running cats and a nismo exhaust which can only be more restrictive than your resonated test pipes and dual HKS exhaust. I hit 10psi at around 5200 rpms, then it stays there to redline - kinda like a turbo. From what I understand, the cams or maybe my timing map are causing this to happen

Other runs I did it ran 11 and even 11.5 psi, but the same amount of power depending on how hot the engine was running. I don't remember what psi my 435whp ran


going from the 3.12 to the 2.87, I gained about 34whp and 30 tq with dynos being about 2 weeks apart - this dyno is attached

 

Hey Sentry,

I knew you would be like the 1st to post I am worried about the PSI it would be pushing since I am hitting 9.2 - 10 on my 3.12...

Awe Crap.... Just answered my own question I guess.... I am not going to put this on until I get Walbro and a return kit with larger injectors... I dont think the stock fuel system will handle the demands....

Ok, So I guess my eyes were bigger than my stomach...

 

I thought that I read it was about a 2-3 psi increase on the specified car. I can't remember where I saw that info or what the car was running for exhaust. If I find it I will post it.

 

yeah I really wouldn't consider the 2.87 or 2.8 or smaller without at LEAST bigger injectors and a walbro fuel pump. A return kit would probably be wise too, but you can maybe get by without it if the SS box can increase fuel pressure enough - I really don't know though, but I think some people have managed to make it work.

I know some people have made it work on stock injectors putting the injectors at the bleeding threshold at pretty much 100% duty cycle. That's just asking for the injectors to eventually fail though IMO.

 

Your Dyno Chart looks almost identicle to mine with the 3.12... I hit 380 on my last pull about 2-3 weeks ago on the Dyno Dynamics... My TQ is right at 310 like yours w/ the 3.12 as well...

I need to order some stuff it looks like... What about the rods and pistons w/ the 2.8? You think she will hold? I think my engine has proved it's strength w/ 70K on her and 15K of FI and daily driven...

I just do not know the breaking point of these rods

 

Sorry to hijack the thread...but since you guys know a lot about the Vortech. I just wanted to know if, you guys think I will be safe running the 3.12 pulley with all stock internals. As I just picked this pulley up and kind of worried about putting it on my car. Any info would be greatly apreciated.

 

yeah I dunno, going with a built engine is always a smart idea.

So your last dyno did 380whp and 310 tq at dynocomp? Do you by chance have the graph? What rpm did you hit 380 at? Was anything changed since your last visit there where you made 365 on 96-97 octane? I'm curious if it it might partially be the weather. I don't know if their dyno is doing any ambient temp correction or not

I still really think the pistons will have a problem before the rods do on a vortech setup and that seems to be what's happened to most people who have had engine problems. As soon as I have a major piston issue that I can't live with, I'll build the block. I'm pushing almost as much torque as a lot of turbo setups are and so I think breaking actual rods is going to be more of a real possibility, but I still think I'd break a ringland on a piston first

Most people who build the engine and lower the compression, will lose 10-20 hp/tq depending on what they go with

Lately I've been thinking that cams don't really do a whole lot until you start getting into higher power/boost levels. If anything they seem to at least lower boost pressure while making the same if not more hp


drifter23, hell yeah the 3.12 pulley is safe on stock internals as long as you retune. Personally, I'd never even bother with the stock pulley - the powerband just sucks

 

here's one of my 420whp dynos when the engine was warmed up. The midrange is way huger than my old 400whp dyno

 

Sentry
If your making 11psi and its holding to redline . Your belt is more then likely slipping up top . mine does it between 13 and 14.5 psi . Not much you can do about it other than try to make it flow better , or go to a all cog belt set up like D-Sport mags car .

 

hmm yeah that could be
it didn't feel or look like it was slipping though, but I suppose you might not feel it. If that's the case then there's another 30whp or so on the table and it'd just depend on if I want the engine up that high or not

it's not currently tuned for 2 more lbs of boost so I'll probably just leave it for now. I can try adding more fuel myself, but I'd rather do it on a dyno

 

Wouldnt you think it would build boost to redline ? It may build boost much slower . but still build to redline if the belt wasnt slipping .

 

yeah you can see my tq drop and hp level out in the upper rpms starting at 5500 rpms where the boost stops rising.

you're probably right - good catch
not sure why me or my shop didn't think of it. I kept thinking it was weird, but for some reason we all didn't even think about the belt slipping
I'll see what I can do. The worse thing that'll happen if I leave it as it is will be the belt will wear out faster

370 tq at 6300 rpms equals 444whp on my shop's dyno

 

I'll try to find that Dyno Sentry... I'll have to take a pic of it to post it up... I got it around here somewhere...

 

Don't worry about it Art if it's a lot of trouble - wasn't sure if you had a jpg file sitting around somewhere


you know, the more I think about it, other than a shorter belt life, having the belt slip is the exact same sorta thing as getting a wastegate for the vortech - only better in that the blower doesn't actually HAVE to do the extra work and heat up more, just to blow the extra boost out the wastegate. Instead it never makes he extra boost in the first place.

Of course going with a really aggressive pulley and the belt slipping a lot more, will kill belt life even more

 

I thought the same thing till I logged some runs on the R4 . Its kinda scary when I first saw it . Boost every so often would shoot up over 15psi and go right back down . It only happens for a split second . The reason I found it was . When we were tuning we couldnt get a area in the tune [ above 6500rpm & 13psi ] lean enough . It would spike real rich and come back . We logged a couple runs on the R4 and found the boost was spiking . We were tuning in the 13 to 14 psi range and boost was up much higher for that split second .

 

The only thing I see with that Sentry is what happens when the belt doesn't slip and grips and builds that boost up? There is no "saftey" built in and that boost will get thru.

 

Ok Sentry, here is my Dyno at 380 w/ 3.12 pulley... I am also ataching pics of the Reichard Racing pulley.









Can't wait to be able to put this puppy on

 

Triji
You have a link to Reichard Racing ?
Might try a 3.12 pulley

 

Sure booger!!, here you go http://www.reichardracing.com/

They only come in .10 incriments tho so you would have to go with a 3.10 instead of the 3.12