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G25-550 make 600whp?

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xxiaze

xxiaze

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Thread Starter #21
your 25-550 will make "550" HP (not whp) max under ideal circumstances. To make more you'll need nitrous or a larger turbo. There are direct fit options such as the 25-660 and 30-770
The OEM manifold has seen over 400whp, the Peron tubular will easily support 200whp over the OEM manifold
Your flow restrictions at that power level will be cylinder head related (port size, valve size, cams) not the tubular manifold
Okay excellent, that’s what I anticipated and was hoping for. Wasn’t trying to go beyond the G550 for spooling reasons, was trying to hit a firm 500whp or so (@10-12% fwhp drivetrain loss) then slight buff with meth and final compensation with a shot of nitrous to achieve aprox near 600whp. Yes will be fully built motor and ported heads and cam etc. Sound reasonable?
 


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xxiaze

xxiaze

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Thread Starter #22
Side note: was/am not anticipating running a cold 600whp at all times. Just want to be able to achieve that with meth+nitrous. Realistically looking for a static ~500whp out of the G25-550 only being able to take it to 600 hammer town on demand.
 


jeffreylyon

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#23
I don't think that the turbo will be the limiter for quite some time, esp. if you're leaning on nitros.

I did some reading regarding WMI systems and it seems that the consensus is to run a 50/50 mix unless you need the fueling. Water has a larger thermal mass than does methanol and, thus, does a better job at cooling the charge.
 


Se7eN

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#24
This is exactly what I wasn’t looking for as a response though. I get this sort of thing all the time with my build direction. I have a goal and even if it’s rather dumb I’m taking it there. Per my interest. So, that being said... have any real input? Like about what I’m asking? I have a g25-550... I’m curious if I can buff it with meth and nitrous to hit 600whp.
Aux Fuel, Meth and Nitrous maybe. Stock Engine will not really take it for too long. I mean Chris Good did 550whp on nitrous and all that jazz the engine survived seemingly.
 


M-Sport fan

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#25
MFactory had a group buy for uprated half shafts but it never got to the magic number; I think that we were 2-3 commits away.

I dunno about throwing a 100 shot of nitros at a heavily boosted MRX. That seems... enthusiastic.
One of the 300M material (or better/stronger?) custom racing axle companies could build something for that app/power level, but yeah BIG $$$$!
 


jeffreylyon

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#26
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xxiaze

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Thread Starter #27

M-Sport fan

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#29
I'm not sure of the material but the price point didn't seem unreasonable given the required engineering. Lemme see if I can find the thread...

Edit: https://www.fiestastforum.com/threads/gauging-interest-m-factory-updated-cv-axle-shafts.12842/
Yes, m-factory's price point for the GB was more than reasonable, I was referring to the one off custom builders out there who would charge many times that, since m-factory nixed that deal. [:(]
 


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Thread Starter #30
So after doing some more digging and asking of questions turns out I’m kinda dumb for thinking to use meth with e85? Apparently meth is basically a fuel cooling agent and slight octane booster. So really in running E85, a cooler fuel, there is no need to run the meth injection. Kinda redundant, and benefit isn’t really there. That leaves nitrous exclusively as the benefit to this build. It seems to me that the g25-550 will be capable of producing a cool 500whp with the appropriate engine build. I’ve also encountered more communication on the half shafts... apparently they’ll hold up well enough for anything I’m trying to throw at it without drag racing abuse. So no real need to upgrade there. I don’t have definitive answers on the transmission but I’ll ride that out until breaks then move to treated Clarke trans. It’s very unlikely however that I’ll actually see 600whp and more closely the build would sustain 500-550 including a 50-75hp wet shot.
 


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#32
While you are at it, you might as well get some aftermarket fender flares and get the biggest tire width that will fit to make use of the H.P. Now after that, go out and get a few spare half shafts to have as spares, as the stock ones will break if the tires hook up. If you can't effectively get traction, what's the point of all of the horsepower? At the top of the rev range for me, 330 whp was spinning the tires in third.
 


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Thread Starter #33
While you are at it, you might as well get some aftermarket fender flares and get the biggest tire width that will fit to make use of the H.P. Now after that, go out and get a few spare half shafts to have as spares, as the stock ones will break if the tires hook up. If you can't effectively get traction, what's the point of all of the horsepower? At the top of the rev range for me, 330 whp was spinning the tires in third.
Have ordered the carbon pixels wide body kit +2.75” at all corners.
 


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Thread Starter #34
So question, can anyone explain to me the primary benefit of a short vs long runner style exhaust manifold? Example, the Peron setup I purchased has a tubular long style turbo manifold and let’s say the puma speed manifold has a shorter style manifold.... or a ported stock manifold vs long tube exhaust manifold. Does the Peron / Nortech manifold that I purchased add specific gains to top end power but sacrifice low rpm response and loss in spool time? How does all that work? Pros and cons etc
 


MagnetiseST

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#36
Yeah, and like I said you'd want longer ones. You'd probably want to shift the power higher vs lower, especially shooting for the numbers you want. IMO you'll want to make peak tq around 4k and peak power around 5500 then have it taper off. It really depends on what the G25-550 can do.
 


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Thread Starter #37
Yeah, and like I said you'd want longer ones. You'd probably want to shift the power higher vs lower, especially shooting for the numbers you want. IMO you'll want to make peak tq around 4k and peak power around 5500 then have it taper off. It really depends on what the G25-550 can do.
Fortunately, the nortech turbo manifold is built pretty long. Not sidewinder long but I believe the longest of stock location setup that’s currently offered. Interestingly enough the puma speed turbo setup is reverse rotation G25-550... apparently this helps spool as well when accompanied with the shorter runners in their kit? Not sure why reverse rotation would have to do with anything benefiting?? Just spins the other way....

so, the peron setup is standard rotation g25-550, which I’m actually grateful for because it gives me greater options for turbos in the future if need be. The g25-550 should see full power at roughly 3500-3700rpm... hoping to be able to increase the rpm range to hang in a little longer.

desired to pull to 7500-8rpm. Not sure if the head/motor can be built to handle 8k? Anyone know?
 


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Se7eN

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#38
Fortunately, the nortech turbo manifold is built pretty long. Not sidewinder long but I believe the longest of stock location setup that’s currently offered. Interestingly enough the puma speed turbo setup is reverse rotation G25-550... apparently this helps spool as well when accompanied with the shorter runners in their kit? Not sure why reverse rotation would have to do with anything benefiting?? Just spins the other way....

so, the peron setup is standard rotation g25-550, which I’m actually grateful for because it gives me greater options for turbos in the future if need be. The g25-550 should see full power at roughly 3500-3700rpm... hoping to be able to increase the rpm range to hang in a little longer.

desired to pull to 7500-8rpm. Not sure if the head/motor can be built to handle 8k? Anyone know?
I've seen a few cars shifting at 7500, don't really know about 8K though
 


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#39
Not trying to crap in anyone's Cheerios but a 600whp 1.6, stroker 1.8, etc usually drives like crap, unless there is motorsport level magic money involved.

Somehow a larger displacement swap will probably be cheaper, easier, and more effective for that kind of power.
 


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Thread Starter #40
Not trying to crap in anyone's Cheerios but a 600whp 1.6, stroker 1.8, etc usually drives like crap, unless there is motorsport level magic money involved.

Somehow a larger displacement swap will probably be cheaper, easier, and more effective for that kind of power.
Agreed, I think 500-550 is realistic and will be goal. It might drive awful, but will be fun!
 


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