Does anybody know how to calculate how much increments of 1 PSI of boost would equal in horsepower?

I'm running about 7 psi right know but I'm about to go to 14 psi and I was wondering how much HP that might be.

 

As a starting point, you might take a look at my dyno comparison page at http://www.catenet.net/dyno.php

It has some GT35/40s on there with some different mods and you can make some guesses about how the turbo will do.

Brian

 

It really depends on what engine work you have done also. You may get 10-12 hp on a stock port and 14-15 on a big street port.

 

Also the Efficientcy range of the turbo is important. My car started making alot more Hp per PSI after it got into "its sweet spot" For my stock ported motor it was after 15 psi and it made almost 2x the power per PSI then it did at below 15 psi. Now with my ported motor it will probably make even more in the same area. You can actually hear the turbo start to pull in larger volumes of air above 15 psi. You can almost only hear the turbo up in that range and drowns out the straight through exhaust. The GT3540 has a few things going for it. It spools a bit quicker than most standard bearing turbochargers of the same size making better low end power from the Dual ball bearing design. Also it really makes its best power above 15 psi. I think thats why its the Ultimate street/Strip turbo. Some will make a bit higher power up top but for a street car its the perfect compromise. Let me know if you have any questions.

 

man i like hearing good things about the 35/40. say i have a large street port from pineapple, and the 35/40 kit. 1600's and 550's, denso pump, & hks ign. if i run some c16,(airport 1/2 mile away) just how much boost can i run on this turbo? projected hp? thanks
s

 

paximus - it's all in the tuning, but 500rwhp is possible with your setup, although you might need more injector and a second pump.

 

1600's and a 550 does seem borderline. maber 850 primaries

thoes injectors could support 500hp at 80% i think

850's for primarys would bring that down to 70

 

I heard a rumor that the PFC only has settings up to 1300cc's. I've been debating wether to get the nipodenso 1300cc injectors or the Bosch 1600cc injectors. Do you guys have any idea which would be better?

 

Get the datalogit and you'll be able to set the Power FC for 1600cc secondaries.

 

hrmmm... the 550's are at rc-eng right now getting cleaned, i could get them punched while they're there...decisions, decisions. i dont NEED 500rwhp, but it sure would be nice to spank the supra folk around here. well, i should anyway, but 500 would be an *** woopin'! i was thinking about another pump. its(denso) not installed yet, is there a single pump that would flow enough for that, thats not $700? or could i use my stock pump inline also? i'm not real knowledgeable when it comes to pumps. time to search i guess.
nocab- in your sig you have dual indy cart pumps, and the denso, what are you using?

and where can i get the best price for the datalogit? thanks guys. i cant wait, its gonna be a whole new car when i get it back.
finally single...(in more ways than one..lol)
s

 

PFC with commander can set the injectors up to 1500. The datalogit allows you set it even higher.

Tim

 

I only run 1600cc+ sec inj, I wouldnt ever use anything smaller. I am thinking of going to 850 pri. At 17 psi i saw 83% duty with 550/1600 combo. Thats about 440 rwhp. Also the limit of Supra pump and injectors. Anything more and you will want a dual pump or bigger flow pump, bigger lines and 850 pri with 1600 sec.

 

Failure rate is HIGH for 1300cc inj, also cant support as much power as 1600's. You will be hard pressed to make 400 hp with 1300 and 550's without risking your entire motor/turbo.

 

how much are supra fuel pumps nowadays?
and my setup is 2x720 and 2x1600. i don't see any reason not to go with two 1600s in the secondaries. our engines already suck down fuel, i want as much as i can get.

 

i think about 175-195 for a new supra pump.

 

Zavier doesn't believe this about the ND pump not being able to supply enough fuel for stock lines and 550/1600's. At least not from me. Give him some more information and if the gets it.

 

I done at least 30 pulls on the dyno, with 1600 and 550 and denso pump.

 

The only problem with the 35/40 I know if is it gets over run by a bridge ported motor. That's why I don't think that it will be enough for me. I would really love for someone to prove me wrong though. I want to use the 35/40, but I don't think that it will be capable of what I need. (which is 450-460rwhp@15psi and over 500rwhp@20-22psi)

 

The Supra pump is good for 550rwhp on a Supra. Of course we are running 12.5:1 so a little less on the RX. Supra pumps do not like 12 volts continous, they will overheat, and do not last if you run 12vt all the time. Most guys run dual 114 Walbros@~120.00 a piece. That set up is good for 800rwhp. Carl Byck

 

I dont see you making that kind of power (GT3540)unless you do all sorts of tricks like 02 injection etc. Better off with Bigger turbo. I still suggest a Dual ball bearing type. Check out Apexi T51R, KIA, Garrett GT42 etc. I expect my car to make near your power output with my new ported motor but Its just not flowing as much air as a bigger Turbo as same Boost. You Need a very large turbo.

 

I should have a new turbo for you guys very soon.

-Sean

 

I wasn't talking about making that power with a 35/40. I know that isn't going to happen. I'm setting my sights on a T-66BB or a T04Z(T04RBB). Those seem to be the best choices for my setup. I'm not very familiar with any of the characteristics of the GT42 and would love to know more if you have the info handy. I like the GT series turbos, but I still think that the two turbos I previously mentioned are still going to be the way to go. That may very well be a lack of experience talking though so please do set me straight if I am wrong. Laterz.

Zach

 

I say it again, and it's none off what you guys have listed.

 

Would you care to elaborate on your "new turbo" that you'll be releasing to us. Or at least give some hint as to what turbo it would be like? If nothing is being mentioned then it doesn't help any of us to know that you'll be releasing a new one soon. I'm not trying to be an *** or anything, I would just like to know more about what you're talking about. Thanx.

Zach

 

It isn't MY turbo just a turbo that will be another option for you soon, but until I get the first few, I would prefer not to say too much, just that I think it may be the answer you would like to hear. If you still need a turbo when I have these, this may be what your looking for, If get one of the others discussed. I'm sure you'll still be happy with your purchase.


-Sean