Anyone with 50 trim running 17 to 20 on pump with stock smic??

[AL92]

Just wondering if this is possible.Especially maybe this time of year when outside temps will be like 30 F to -30F or more shortly.I do of course plan on one in spring likely and am running around at a sort of boring 10psi or so now and timing is 15 to 19 range but might be able to get it a bit better with a bit more tuning.

Any of you guys manage to run 17 to 20psi or more on your 50 trim and stock sidemount and still see 15 to 20 degrees of timing.I assume past 20 timing is not really necessary or even a good idea.

I have fuel support mods..supra tt pump,650 injectors ,afpr,maft for tuning right now and of course logger.

What is danger point for timing to be getting very close to audible detonation or damage..under 4 degrees wot which is hear is what happens at full 43 counts of knock??

[1fast97gsx]

well lets see ... people can't run more than 17 psi on a stock smic on a 16g safely ... so what makes you think you can run the same amount or even more on a bigger turbo????! Buy a fmic and then turn the boost up to 20 and be happy.

[AL92]

Had a few people say that due to the efficiency of the 50 trim at that 18 to 22 range it won't put out near the amount of heat of a 14b or mabye 16g at those boost levels.Maybe they are wrong and my 50 trim will put out more heat at 18 to 22 range.Anyone else know for sure which is right.Beside as long as can get minium suggested 15 degrees timing at wot does it matter that much??

[Dallas J]

A 50trim at 20psi may not put out as much heat as a 16g, but It does put out more air. So their is more air to cool. Aproximately 5lb/min difference with stock cams difference..

Get a FMIC, or keep the boost below 17psi ish..

A maft is hardly a tuning device. At least get an AFC.

As far as knock. With a 50 trim you should be getting into the max airflow area (above 2.1grams/sec) and with intake temps below 110, coolant below 120(i think thats it), and no knock you should see 18* of timing at redline. 5* of timing retard would suggest about 12 counts of knock, but really 2gs are tuned by the timing retard and not a knock count like the 1gs are.

If you are dropping below 15* of timing then you need to add fuel, or get DSMLink and pull timing so it doesnt knock in the first place.

-Dallas J

[kxc36g]

I blew my motor a few years ago running my 20G at 18lbs with the stock sidemount and proper fuel control. Get the front mount; it is one of the most effective mods you can make. Do you like Las Vegas?

Chris

[zross1]

I run 20 psi in cool weather >60 degrees and see no knock and beautiful timing with my sidemount. You'll be fine in cooler weather. Like you said though, when it starts to get warmer in the spring you'll want to get a front mount.

[DSMeclipse4G63]

Originally Posted by AL92

Just wondering if this is possible.Especially maybe this time of year when outside temps will be like 30 F to -30F or more shortly.I do of course plan on one in spring likely and am running around at a sort of boring 10psi or so now and timing is 15 to 19 range but might be able to get it a bit better with a bit more tuning.

Any of you guys manage to run 17 to 20psi or more on your 50 trim and stock sidemount and still see 15 to 20 degrees of timing.I assume past 20 timing is not really necessary or even a good idea.

I have fuel support mods..supra tt pump,650 injectors ,afpr,maft for tuning right now and of course logger.

What is danger point for timing to be getting very close to audible detonation or damage..under 4 degrees wot which is hear is what happens at full 43 counts of knock??

yes there are people doing this Im sure.....but they are probly on there 2nd or 3rd motor or are pulling peak timing of -15degrees After TDC thus making them slower then me on my bike with the "taco'd" wheel...
Andrew

Originally Posted by Dallas J

coolant below 120(i think thats it),
-Dallas J

its 230 or less 120 is a cold motor...

[joeracer321]

There are two reasons I see for the FMIC upgrade. Of course the first one that stands out is cooling efficiency. But something that I haven't seen mentioned in this thread is the flow of the stock intercooler. It would be a huge bottleneck and I am sure you would see a big pressure drop across the intercooler. If you want to step up to the 50 trim, you do the fuel system and other mods, why would you cut yourself short on a stock junk intercooler?

[Dallas J]

Originally Posted by DSMeclipse4G63

its 230 or less 120 is a cold motor...

Oops, I meant 220... but yeah youre right its 230

-Dallas J