bosstin87 Posted March 11, 2009 Report Share Posted March 11, 2009 well finally got her all situated, what is a safe airfuel, or a safe boost level for a car with(fuel system) just a 1gmass, and afpr, and what fuel pressure. Link to comment Share on other sites More sharing options...
dmyers151 Posted March 11, 2009 Report Share Posted March 11, 2009 (edited) -What are your block and head modifications? -Do you have a wideband? -Is your FPR a rising rate style? Your going to want your base fuel pressure at idle to be around 37psi. I can't be sure but I don't think a stock block and head will hold 20psi. Edited March 11, 2009 by dmyers151 Link to comment Share on other sites More sharing options...
bosstin87 Posted March 11, 2009 Author Report Share Posted March 11, 2009 [/color]-What are your block and head modifications? -Do you have a wideband? -Is your FPR a rising rate style? Your going to want your base fuel pressure at idle to be around 37psi. I can't be sure but I don't think a stock block and head will hold 20psi. well,rebuilt bottom end,bs elim ,.40 over hyp. pistons,njv head with street port and polish,oversized valves with superflow mod(bottom of valve stem diameter is shaved),hd valve springs,mech. rockers, stock cam,uego wideband,255 walboro, no not a rising rate regulator,1g mass, isc removed,ported throttle body. i think thats it Link to comment Share on other sites More sharing options...
BOHO Posted March 11, 2009 Report Share Posted March 11, 2009 You have to have a rr fpr.......Most guys running the same setup....I would stay below 12.0...but if you don't have a piggyback....your not gonna have much choice... Link to comment Share on other sites More sharing options...
bosstin87 Posted March 11, 2009 Author Report Share Posted March 11, 2009 well, i just did a few runs down the road @18psi i was reading 11.2-7 Link to comment Share on other sites More sharing options...
dmyers151 Posted March 11, 2009 Report Share Posted March 11, 2009 [/color] well,rebuilt bottom end,bs elim ,.40 over hyp. pistons,njv head with street port and polish,oversized valves with superflow mod(bottom of valve stem diameter is shaved),hd valve springs,mech. rockers, stock cam,uego wideband,255 walboro, no not a rising rate regulator,1g mass, isc removed,ported throttle body. i think thats it From what I understand, the 1G MAS usually causes the car to run richer than stock, so thats a start. However, I wouldn't suggest going over 14 or 15psi without first upgrading your injectors and maybe going to a GM MAS and MAF-T unit so you can actually tune your AFR's once you establish where your at. Link to comment Share on other sites More sharing options...
Caliber308 Posted March 11, 2009 Report Share Posted March 11, 2009 well, i just did a few runs down the road @18psi i was reading 11.2-7 So, Why ask???? Your doing what you want anyway. (18 psi ) CALIBER 308 Link to comment Share on other sites More sharing options...
Caliber308 Posted March 11, 2009 Report Share Posted March 11, 2009 From what I understand, the 1G MAS usually causes the car to run richer than stock, so thats a start. However, I wouldn't suggest going over 14 or 15psi without first upgrading your injectors and maybe going to a GM MAS and MAF-T unit so you can actually tune your AFR's once you establish where your at. Agreed. The higher you boost a turbo, the shorter the life span is. I'll leave it at that. CALIBER 308 Link to comment Share on other sites More sharing options...
scott87star Posted March 11, 2009 Report Share Posted March 11, 2009 Don't forget about timing, the stock system will only pull out about 7 degrees and is designed for stock boost levels so going above that with the stock timing system will provide too much advance. Scott Link to comment Share on other sites More sharing options...
Caliber308 Posted March 11, 2009 Report Share Posted March 11, 2009 [/color] well,rebuilt bottom end,bs elim ,.40 over hyp. pistons,njv head with street port and polish,oversized valves with superflow mod(bottom of valve stem diameter is shaved),hd valve springs,mech. rockers, stock cam,uego wideband,255 walboro, no not a rising rate regulator,1g mass, isc removed,ported throttle body. i think thats it So, What is you fuel pressure at 18 psi ????? Do you have a fuel pressure gauge?? If so, Ever checked it on boost to see what your real FP is at 18 psi. How do you set it without a RRFPR??? Here's the way you do it: Install a FPG so you can read it on boost. Installed a Adjustable RRFPR so you can set your FP. What year ECU are you using? Any injector modifications????? I have a s--tload of mods on my engine. Would I ever boost to 18 psi without a way to read my fuel pressure and a RRFPR to set it??? HELL NO. It's your car..... Do what you think is best. CALIBER 308 Link to comment Share on other sites More sharing options...
Scotty Dont Posted March 11, 2009 Report Share Posted March 11, 2009 id be careful with those hyperutectic pistons, forged would be the way to go if your gunna be boosting any higher then 15psi Link to comment Share on other sites More sharing options...
Shelby Posted March 12, 2009 Report Share Posted March 12, 2009 didn't see any mention of ARP studs,, oem head bolts aren't good for 20 lbs Link to comment Share on other sites More sharing options...
bosstin87 Posted March 12, 2009 Author Report Share Posted March 12, 2009 sorry, have those to, i just wanted to know if i was going to hurt anything even if the numbers were all good Link to comment Share on other sites More sharing options...
michael knight Posted March 12, 2009 Report Share Posted March 12, 2009 What ecu are you running? My guess is an 89. Here's another guess, go much higher and you'll meet Mr. fuel cut. Don't always trust the wideband 100%, especially if it's close to the turbo. Turn it down to 15-17 and call it a wrap until you get a better FMS. Just my $.02 Link to comment Share on other sites More sharing options...
JustPaus_88TSi Posted March 12, 2009 Report Share Posted March 12, 2009 Fuel cut... lol We'll never get away from that retarded term. So, what "cuts" the fuel? Almost nobody here runs a RRFPR, one where you can add 1, 2, 3 etc extra psi of fuel to every pound of boost. What everyone runs are BCFPR's, with the occasional one that is baseline adjustable. This has all been done before. 18psi on a TD06-18G(Greenstar).. All he needed was a baseline adjustable BCFPR. If you have a solid build and the AFR's are in check. Where's the problem? Yes, the turbo will die faster with higher boost levels. And? Check the plugs after a few good romps, see what they look like. (BTW what plugs are you running?) Link to comment Share on other sites More sharing options...
bosstin87 Posted March 12, 2009 Author Report Share Posted March 12, 2009 ngk replacments, i had spark blowout at 17, so i gapped them to .028 or 28 how ever you prefer, and what is this thing that i cant run high boost because of the timing. please shead some details. Link to comment Share on other sites More sharing options...
bosstin87 Posted March 12, 2009 Author Report Share Posted March 12, 2009 um....... no, 87 Link to comment Share on other sites More sharing options...
Hoosierquest Posted March 12, 2009 Report Share Posted March 12, 2009 Fuel cut... lol We'll never get away from that retarded term. So, what "cuts" the fuel? Almost nobody here runs a RRFPR, one where you can add 1, 2, 3 etc extra psi of fuel to every pound of boost. What everyone runs are BCFPR's, with the occasional one that is baseline adjustable. This has all been done before. 18psi on a TD06-18G(Greenstar).. All he needed was a baseline adjustable BCFPR. If you have a solid build and the AFR's are in check. Where's the problem? Yes, the turbo will die faster with higher boost levels. And? Check the plugs after a few good romps, see what they look like. (BTW what plugs are you running?) I agree sounds like his AFR is in check. whats the big deal? Link to comment Share on other sites More sharing options...
dstar88 Posted March 12, 2009 Report Share Posted March 12, 2009 yea, not sure what all the fuss is about..i can understand playing it safe. but im pushing around 15 lbs with a 16g...maybe not a big 16 or super 16 but its still a bigger turbo. and my engine has minor mods and no engine work. and to top it off my car still runs ars rich cuz of the 1g mass. theres also a thread on hear explaining how the stock bottom end is actually pretty darn strong in comparison to other engines that have made some good numbers. this guys engine is has been built.. and the afr seems good at 18. the only thing i would say, is take it to a dyno and do maybe 3 runs so they can monitor the engine on the computer, they'll let you know if it can handle 20 lbs. ive got a friend that has a quest over here with a built,ported, and o-ring engine, pushing 28lbs on an 18g with a water/meth kit and is on a bottle every once and a while..well over 300 to the wheels...ohh yea, did i mention hes still on tbi (ported of course) with stock 89 ECU and a 1g mass with no signs of leaning out any. anything is doable, as long as its tuned good :-). Daniel Link to comment Share on other sites More sharing options...
bosstin87 Posted March 12, 2009 Author Report Share Posted March 12, 2009 thanks for the input, and to add, i turned down to 17 from 20, and my AF was 10.5 WOT, i do believe that i am safe at 19-20psi Link to comment Share on other sites More sharing options...
JustPaus_88TSi Posted March 13, 2009 Report Share Posted March 13, 2009 NGK replacements? What heat range? I hope you have at least 7's, if not 8's in there. The 6's are way too hot for your setup. Link to comment Share on other sites More sharing options...
Shelby Posted March 13, 2009 Report Share Posted March 13, 2009 thanks for the input, and to add, i turned down to 17 from 20, and my AF was 10.5 WOT, i do believe that i am safe at 19-20psi you most likely have raw fuel going out the tail pipes at 10:1 Link to comment Share on other sites More sharing options...
JustPaus_88TSi Posted March 13, 2009 Report Share Posted March 13, 2009 (edited) ive got a friend that has a quest over here with a built,ported, and o-ring engine, pushing 28lbs on an 18g with a water/meth kit and is on a bottle every once and a while..well over 300 to the wheels...ohh yea, did i mention hes still on tbi (ported of course) with stock 89 ECU and a 1g mass with no signs of leaning out any. anything is doable, as long as its tuned good :-). Daniel Sounds like ChrisViper's old car. He has an additional injector in the OVCP with a greddy emanage ultimate controlling it. Edited March 13, 2009 by JustPaus_88TSi Link to comment Share on other sites More sharing options...
bosstin87 Posted March 13, 2009 Author Report Share Posted March 13, 2009 uh, i just asked for the one that came in it, what will colder plugs do for me Link to comment Share on other sites More sharing options...
Technology Posted March 13, 2009 Report Share Posted March 13, 2009 Colder plugs can ward off detonation, they are a good thing for higher boost like 20psi. I had ngk bpr8es plugs in my car forever and didn't have a single problem. I recently bought some 7's and will be going back to 8s because of what I want to do with my engine. I recommend 8's for you. And if your wideband says it's below 12:1 AFR, keep going with the boost! why stop at 20? if your boost controller is good enough to adjust in small increments, just bump it up a tiny bit until you start seeing the AFR's lean out, then turn it back a little and leave it. I want a stock engine with a big turbo so bad so I can do the easy cheap mods like this. Link to comment Share on other sites More sharing options...
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