650's- 20psi

[wishful_laser]

quick question, i need to know if i can turn up the boost to 20psi with a built block, upgraded fuel pump, 650's, and an safc. at the moment i dont have a logger but i did use the safc tuning sheet on the tech page as reference. im running about 16psi right now and my air\fuel gauge is showing rich at wot. so i figured 4psi more wont hurt. i barely lost to a 97 z28 yesterday but i wont go into detail since bench racing is not allowed.

 

[Staytuned]

A/F gauge is useless really to tune with. I would wait to get some data off a datalogger before I would go to 20 psi. You need to see if your knocking or not before you go further. Also how old is your turbo? I guess original 14B, you might be putting the life of your turbo in jeopardy if you push the old thing too far.

Also I see you have no IC in your profile....so heat soak will be your worst enemy.

 

[wishful_laser]

no unfortunately i still have the stock turbo and intercooler but i do need to update my profile as it has changed. the block is built up so im not too worried about that. heat soak is my only worry as i have read about dsmer's running high boost on the 14b.

 

[Staytuned]

Heat soak will cause some nice knock....so that seems to be the only real concern that I see.

 

[RiceKiller_TSi]

Your profile says you have a logger.
I don't think you'll have a problem with 20psi other than some knock.
Knock can definitely kill even a built block on an improperly tuned engine.
Use, or get a logger and see what kinda of knock you're seeing and how your timing looks.

 

[spyderturbo007]

As everyone stated above, you really need to invest in a logger

Also, you have to remember that this is all about flow, not pressure. You can be at 100psi, but if you are only flowing 15 lbs/min, you are never going to overrun your 650's. On the other hand, you can be pushing 10psi, but if you are flowing 45 lbs/min, you are overrunning your injectors.

 

[1990EclipseGSX]

Yes, get a logger! It would be a shame to blow up a built motor because you didn't have a datalogger.

 

[DJ23GSX]

Heatsoak is definatly going to be you biggest problem at 20psi After heatsoaking the i/c you will get knock. Maybe alot maybe a little but without a logger you'll never know how close to blowing something up you are. I wouldn't turn up the boost any more until you have a logger of some sort. I couldn't imagine trying to tune without one. I was able to run 20psi on my 14b with stock injectors a walbro 255 fuel pump and a mkiv i/c (no afc or afpr) without any knock. After about 5-6 wot 3rd gear pulls i was starting to see a few counts of knock meaning the 14b was starting to heatsoak the mkiv i/c which is almost twice the size of the stock i/c.

 

[wishful_laser]

yeah i agree with you guys. i turned the boost down to 12 psi yesterday. my thing is that i want to go stane alone eventually and i dont want to spend the money on a logger and software then have to sell it when i get my stand alone.

 

[kazzam]

loggers are cheap, deff cheaper then an engine. spend the $30-50 bucks on one and get a decent tune. once u go stand alone, sell the logger to someone on here like yourself...

 

[spyderturbo007]

As far as the heat soak, I do pretty good on the SMIC running 20psi on my EVOIII. I only flow about 33 - 34lbs / min because of having the stock cat back. On a normaly night, I can make two or three third gear pulls, back to back, and not run into a timing pull.

That's assuming a temperature of about 70 degrees, as I only drive the Spyder on nice, warm, summer nights / evenings.

 

[dsm-onster]

Well I got terrible, audible knock on my stock ic with a small 16g boosting to 18 psi... Take it or leave it. Get a logger before you up the boost. You have the fuel but not the cool aircharge. A $200 water injection kit will get you farther than an expensive front mount kit. Until you try to flow more air than your stock ic can flow. I did great with the STOCK fuels system and 20 psi once I got water injection.

BTW, why run 20 psi with a 14b and ruin it in a few thousand miles, when you can just run it at 15-17 psi and not heat soak your stock ic so bad and advance the timing/lean out a bit and make the same power . You can sell a 14b on ebay for adecent return and put that toward a bigger, better turbo for the level of performance you're demanding from an older 14b.

 

[DJ23GSX]

As far as the heat soak, I do pretty good on the SMIC running 20psi on my EVOIII. I only flow about 33 - 34lbs / min because of having the stock cat back. On a normaly night, I can make two or three third gear pulls, back to back, and not run into a timing pull.

That's assuming a temperature of about 70 degrees, as I only drive the Spyder on nice, warm, summer nights / evenings.

Your EvoIII 16g is a lot more efficient at 20psi than a 14b thats why you don't heatsoak your i/c as fast as a 14b would.