Max power/boost on stock internals

[240240]

Hey guys, in the near future i am upgrading my turbo to the GT3040R, 550cc injectors and front mount. I already have a 3" straight pipe, HKS SAFR, and MINES ECU.....

Im just wondering what my #'s might look like and what is a safe boost to run on stock internals?

Do you think this is a good turbo upgrade? Big enough injectors?

Thanks

[krayton]

have any clues on your mines ecu specs?

and is the hks safr anything like the safc? id just be concerned with the tuning. other then that I think big numbers could happen.

a headgasket upgrade would probably allow for abit more

[240240]

Donno the exact specs on ecuwould imagine--full exhaust, aftermarket turbo, injectors, z32 maf, ????

[krayton]

did

Donno the exact specs on ecuwould imagine--full exhaust, aftermarket turbo, injectors, z32 maf, ????

did you run the ecu with your stock setup ok? ie maf and injectors

[eh?]

You should dump that mines ecu, buy my Power FC and some 740cc inectors . ~500rwhp is safe with the stock internals, with a good tune of course.

[krayton]

^i still question the headgasket. im gonna be pushing some boost soon, and i think thatll give.

i really hope not though. not even expensive, but taking that damn head off! arggggg

[goofynick6]

I run 20 psi with no problems on my 57 trim t3/t04e. You should be fine to 18-20 psi. Those injectors are more than enough as well.

Nick

[rbsileighty]

Is that on pump gas nick? Which a/r are you running on the turbine and what's your spool up like?

[s13burger]

I run 20 psi with no problems on my 57 trim t3/t04e. You should be fine to 18-20 psi. Those injectors are more than enough as well.

Nick

Are you still using a factory headgasket, also how long have you been pushing 20 psi?

[dekand]

you guys should be more clear on what motor your talking about ... lol

[eh?]

In 4 yrs of reseaching the swap, I can't think of a single RB25 HG failure. Most likely because, sadly, the ringlands are the weak spot The Failure thread on SAU pretty much confirms this, not a single HG failure- pretty much all ringlands.

Oh yeah what motor is this?

[krayton]

^ good and bad to hear? i guess...

ive been talking about the rb25 of course

[s13burger]

My question was directed towards goofynick. Judging by his signature, I think they were talking about the rb20. That's what motor my questions were for.
Modified by s13burger at 4:42 PM 8/8/2005

[goofynick6]

RB20, Hess 93 octane..heh. Been running 18psi for a while, just went to 20 and I like it. 26 degrees timing at full boost.

I have .63 stage 3 wheel and 3" exhaust cutout on the downpipe. I get 20psi by about 4600 rpms. It's a bit slow, I would definitely definitely have gone for the 50 trim instead of 57; better spool and efficiency with the 50.

330whp/305wtq btw

Nick

[Yellow4g63]

RB20, Hess 93 octane..heh. Been running 18psi for a while, just went to 20 and I like it. 26 degrees timing at full boost.

I have .63 stage 3 wheel and 3" exhaust cutout on the downpipe. I get 20psi by about 4600 rpms. It's a bit slow, I would definitely definitely have gone for the 50 trim instead of 57; better spool and efficiency with the 50.

330whp/305wtq btw

Nick

Sweet got the problem fixed?

[narfdanarf]

your numbers seem awefully low to me.

You must have some sort of big choke point in that head somewhere, or a bunch of small boost leaks.

If you look at a compressor map, at that much psi that turbo should flow close to 45lbs/min at least. With a good flowing head that means you should be around 400hp or so.

At my shop we just got done putting together a 1.6l honda with that same turbo, at 21lbs it made 410hp and 305tq. Just too bad it's to the front wheels

[goofynick6]

No boost leaks, don't think there's a choke point. I thought the number was low, but I don't know what else to do. The stock head just doesn't flow that well I guess. Every engine setup is different, so hard to compare sometimes. My dyno still tapers off at the end, but not sure why exactly. I'm guessing it was a breathing problem, but I'm not about to take the head off and port it.

Nick

[rbsileighty]

I would put money on cams... does your power fall off around 6200?

I've got what I think is a 50 trim on mine with a .48 turbine a/r... want it? The center section is shot (bought it used) and I hope the compressor hasn't met the housing yet. I'll part with it for very little... got anything cool to trade? You'll probably have to wait toward the end of the year when I will finally have time to pull it off. Keep it in mind... It'll probably be december before I get time, but maybe the end of Sept.

Nice numbers for what you have I'd say...

[SillyRB]

Out of curositly , GoofyNick what type of dyno did you use. Was it a dynojet or a Mustang Dyno etc? Because MDyno's have been (Depending on Calibration) known to give out 15 - 18 % lower readings than Dynojets. In that case putting you @ around 375-385 RWHP. Lookin @ the compressor Maps etc of a 57 mm Turbo the turbo is not gonna reach its primary efficiency til after 18-19 psi, the # will start ro rapidly increase after 20 psi, especiall on a 2.0.

[goofynick6]

I also think stock cams are the limiting factor in the equation. I am not changing turbos at this point, I'm getting ready to sell the car anyway..heh. It depends on volumetric efficiency, etc, but I think the compressor is starting to go out of efficiency right around when the cams are killing off the power band. The engine has great compression, doesn't burn a drop of oil, is tuned fine and there are no leaks. I just think a more properly matched turbo would be better, but at the time of the turbo selection (almost 2 years ago) I didn't know as much about matching them to particular engines based on RPM levels, efficiency and displacement, etc.

It was a DynoJet, so it was reading around where it was supposed to I'd say. All I know is I raced my friend's Vortec Supercharged 97 Cobra making over 425whp and beat it (video to prove it).

Nick

[Yellow4g63]

Never mind I get it. Wheres the video?

[Andrew85cm]

Dynojets read lower than mustang's was the point. If you were on a dynojet that number seems rather low. You might have other issues because I would imagine a lot more power can be had at that high of a boost level. Wasn't there another guy on this forum making similar numbers on a mustang with stock boost levels. I would check your stuff. Anyway not bashing my rb20 is as stock as they come. I agree with rbsileighty it should be your cams that hold you back in the top end. You go much past like 5500-6000 grand and power falls where as your turbo should be making its most power at that point. Dang rb20 heads. I am going to replace the cams as soon as I can get the money along with some valve springs ect and maybe talk to my machinist about bigger valves or if that is plausable without extreme modification of aftermarket parts to get them to fit. Anyway good luck with your build. I bet she still hauls. Nothing like putting mustangs in their place. I mean they weigh some 3800lbs or something so they need to figure some power to weight ratios and come meet again.~ANDREW~

[rbsileighty]

I also think stock cams are the limiting factor in the equation. I am not changing turbos at this point, I'm getting ready to sell the car anyway..heh. It depends on volumetric efficiency, etc, but I think the compressor is starting to go out of efficiency right around when the cams are killing off the power band.

Why are you selling your car? What's the next project?

[goofynick6]

Dynojets read lower than mustang's was the point. If you were on a dynojet that number seems rather low. You might have other issues because I would imagine a lot more power can be had at that high of a boost level. Wasn't there another guy on this forum making similar numbers on a mustang with stock boost levels. I would check your stuff. Anyway not bashing my rb20 is as stock as they come. I agree with rbsileighty it should be your cams that hold you back in the top end. You go much past like 5500-6000 grand and power falls where as your turbo should be making its most power at that point. Dang rb20 heads. I am going to replace the cams as soon as I can get the money along with some valve springs ect and maybe talk to my machinist about bigger valves or if that is plausable without extreme modification of aftermarket parts to get them to fit. Anyway good luck with your build. I bet she still hauls. Nothing like putting mustangs in their place. I mean they weigh some 3800lbs or something so they need to figure some power to weight ratios and come meet again.~ANDREW~

Nobody made 330whp on stock boost on a mustang dyno..not gonna in this car w/o a gt42 or something. Someone made 298 on 14psi with a 50trim on a dynojet, but like I said, a 50 trim is a much better turbo for this engine.

I'm working on getting the video off his camera

[SillyRB]

Nobody made 330whp on stock boost on a mustang dyno..not gonna in this car w/o a gt42 or something.

What do you mean by that ?I you talking about RB20's or in general.

[goofynick6]

What do you mean by that ?I you talking about RB20's or in general.

I'm talking rb20's...I don't think you'll see 330whp on 10psi on the rb20 w/o a huge turbo.

[Andrew85cm]

I did state what I said as a question phrased "wasn't there another guy". Anyway I was just saying that at that high of a boost level and for your size of turbo that seems kind of low. I think the guy I am thinking of made some 300 or so at 10 psi. maybe it was on a dynojet but with 10 psi more that still seems low. Don't take what I said so offensively but for your trim and ish I would be a little mad with that kind of power. I don't want to have to run some 20 psi to get 350 at the wheel. That is bad for the head after a while I would imagine.~ANDREW~

[goofynick6]

The guy you're thinking of made 296whp on at 14 psi on a 50 trim turbo (the one I recommend over my turbo), and he was running 20 degrees base timing, where it should be 15-17 max for safety. So, with his better matched turbo and higher base timing I think that's what accounted for it.

NIck

[RB20 Mistake]

Did you make 330 rwhp tuned? If so, what did you use to tune with? I also think these numbers are pretty low for 20 psi. I have a t3/t4 60 trim that I will be using on my 20 and I hope to see much more than 330 at 20 psi.

[goofynick6]

Did you make 330 rwhp tuned? If so, what did you use to tune with? I also think these numbers are pretty low for 20 psi. I have a t3/t4 60 trim that I will be using on my 20 and I hope to see much more than 330 at 20 psi.

Used an eprom emulator and laptop to tune it; modifies stock maps.