Most boost..

[Orion ZyGarian]

Hey, what is a good safe number to run the most boost on with a stock internals?

I'm planning on going GT30R and getting the most torque and low end out of the 7M that I can...but I was wondering at the same time if I could run as much as 18 psi on pump gas of 93. I want it to be as reliable as I can...enough to be a DD, but I do have a DD just in case, but I also want it to be streetable and not gobble up gas whenever I'm not in boost, or even when I am in boost not to gulp down too much...

Basically looking for the best tune for 93 octane with keeping in mind fuel economy, but not so much that I cant make serious power under boost. Out of boost, I've noticed forced induction cars tend to get incredibly good mileage, and even under boost, they make great power without necessarily injecting the entire tank in a few miles. I love the efficiency boost of a turbochager!

Any tidbits? Also, does anyone know where I could get a log style manifold made with a T3 footprint?

 

[boost fiend]

i know that with a ct 26, people have run like 20 psi. with the turbo you have/wanna use, i have no clue.

 

[supra87t/t4]

I am planning on making myself a log manifold for a GT35R, probably with a T3 flange. Dave Henry has made a few manifolds like what you are looking for. 18 Psi on pump gas is probably very near the limit, but it depends on how efficient your compressor is at that pressure and how good your intercooler is. I have looked at the GT30R too, since the GT35R is capable of more power than I am plannign for, but I think the GT30R is going to be a bit small, have you found anyone running that turbo on an engine this large? or anyone who reccomends it?

Glen

 

[GrimJack]

Boost is the wrong measurement - you want to know how much power you can produce on the stock internals.

The answer is slightly different for every car - but the Doc ran over 500 whp for a long time on a stock bottom end. Unfortunately, I don't know what fuel he was pushing for this.

 

[Orion ZyGarian]

I am planning on making myself a log manifold for a GT35R, probably with a T3 flange. Dave Henry has made a few manifolds like what you are looking for. 18 Psi on pump gas is probably very near the limit, but it depends on how efficient your compressor is at that pressure and how good your intercooler is. I have looked at the GT30R too, since the GT35R is capable of more power than I am plannign for, but I think the GT30R is going to be a bit small, have you found anyone running that turbo on an engine this large? or anyone who reccomends it?

Glen

Well I'm looking for the best boost responce I can get, so I figured I should go with a slightly undersized turbo, however I havent found anyone whos actually had a GT30R installed on a 3.0 undersquare engine before.

I'm planning on water spray for the IC, and a good sized IC as well, making it the only part of my setup that wont be so anti-lag in mind.

Boost is the wrong measurement - you want to know how much power you can produce on the stock internals.

The answer is slightly different for every car - but the Doc ran over 500 whp for a long time on a stock bottom end. Unfortunately, I don't know what fuel he was pushing for this.

Yes yes I know boost is the wrong measurement...but coincidentally thats the rating my wastegate is at right now (18psi) and looking into compressor efficiency for the GT30R, 18 psi is a good number for it. http://www.turbobygarrett.com/turbo...gers/gt30_images/GT3076R_700382_12_comp_e.gif is the link to the map, http://www.turbobygarrett.com/turbobygarrett/catelog/Turbochargers/GT30/GT3076R_700382_12.htm is the turbo itself I'm looking into.

Thanks for the help so far though

 

[supra87t/t4]

I see that garrett does list the GT30R for up to a 3.0L engine, I too would be interested in this Vs. the GT35R, I don't really need a 600+ RWHP turbo. However I'm still a little sceptical of going that small, unless you can find someone who has done it or someone who does turbo sizing that would reccomend it.

If you are going to stick with pump gas then the stock internals aren't really a concern. The stock internals can handle the amount of power you are going to make at a pump gas safe boost level. So while boost isn;t the right measurement, neither is horsepower, intake temperature is probably the most important factor, but I don't know of anyone with their wastegate setup to respnd to intake temps, so boost is good enough.

Glen

 

[Orion ZyGarian]

Bump. Looking for more people's opinions on a GT30R and also on running 18 psi on 93 pump. What would the desired A/F ratio be with emphasis on daily driving/reliability..11:1? 11.5:1? 12:1?