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#1
11-16-2006, 09:44 PM
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Max boost on stock bottom end
How much boost would be safe for a stock 7 bolt bottom end with a built head and good headgasket?
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95 GSX 5 speed 2.3L stroker bored .020 over Built head Bullseye/Borg Warner T04B 57 Trim Turbo RNR 3" turboback w/ o2 eliminator 255 lph Extreme Motorsports fuel pump Extreme Motorsports mbc SAFC Greddy Type S BOV FMIC (core 28x10.5x3.5) FIC 650cc fuel injectors RK Sport Fuel Pressure Regulator My Car Domain 
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#2
11-16-2006, 09:56 PM
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Re: Max boost on stock bottom end
20 psi ? I saw some run on 25 psi
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GM FOR LIFE !! NEW 1997 Camaro z28 6 speed illa never going back to import  , but killa alway be nice to any DSM he saw looking for 2002 Trans Am LSX UPGRATE 2010 !! 97 Camaro Z28 95 camaro lt1 1992 Pontiac Firebird v6 auto -sold - Pony 1998 Mustang GT 4.6L Manual. Black 1995 Eagle Talon TSI AWD Turbo manual R.I.P 1994 Mitsubishi Eclipse Manual gray -Sold 1997 Mitsubishi Eclipse RS Auto White - Sold
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#3
11-16-2006, 10:13 PM
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Re: Max boost on stock bottom end
Obviously it's going to depend on your turbo, but from the knowledge I have gathered you should be able to max out anything below a 50 trim and not worry about the bottom end. I'm sure somebody will correct me if I'm wrong.
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'92 3000gt SL Zoom Stage 1 Clutch Quote:
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#4
11-16-2006, 10:22 PM
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Re: Max boost on stock bottom end
On a 7 bolt, I wouldnt push it past 350. However, I would (and probably will) push my stock 6 bolt bottom end to ~450.
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 Build on hold until I get a good paying job, either in school or once I get out. At that time a full tear down and complete rebuild should be in order. The Purple People Eater will ride again... January 2011 can't come soon enough.
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#5
11-16-2006, 11:51 PM
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Re: Max boost on stock bottom end
i've seen some guy at the tracks boosting his at 23psi with 110 octane, he had the basic exhaust system, uicp, filter...very suprised that he ran mid 13s all day
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"i told you it was third, I lengthen the injector pulse another millisec and tuned the NOS timer, and you'll run nines" --2OF9-- (DSM team specialist) ;D #808/1000
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#6
11-17-2006, 12:01 AM
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Re: Max boost on stock bottom end
I'd push a stock bottom end to ~400 without having to worry. 4g63's are strong ass motors, stock 6 bolts will hold over 500hp.
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95 Talon TSI AWD 97 Eclipse GST 
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#7
11-17-2006, 12:26 AM
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Re: Max boost on stock bottom end
I don't know about power, I think the record is in the 550hp range.. I'd have to look on Dsmlink fourms, their was a thread about that about a month ago. I day dream most days about getting a dirrect port setup for my 2g. I would love to see If I could get up their in those kind of #'s. Thats about $2000 away for me for the basic supporting mods and parts.. Zex Dirrect port kik, Progressive digital meth controler, cams, clutch. Got the ARP's and Cometic.. Not a real sinario though.. Sigh...
6bolts are fucking stout. Their is a guy here in spokane who happens to be a huge theif, but had his engine and tranny build by Jake Montgumry in Nampa, ID. Who is running a baiscly stock 6bolt bottem end with a Gt42 with a race head and putting down some stitty # at 30psi. He's such a fag.. 6bolts are seriously proven stock blocks though. If I had one, I wouldn't even touch it unless the compression was bad. Just put a new front-case, oil pump and complete t-belt kit including pullies and shoot for the moon...
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DSM geek
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#8
11-17-2006, 12:38 AM
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Re: Max boost on stock bottom end
Jeff Harrington holds the 7bolt record
Quote:
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DSM geek
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#9
11-17-2006, 12:47 AM
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Re: Max boost on stock bottom end
Yikes! That guy has more nuts than me. I do know/know of several local guys that have been pounding 500+ from stock 6 bolt bottom ends for years. I dont want to push it though, I like it when the rods stay intact and straight
 .
__________________
Build on hold until I get a good paying job, either in school or once I get out. At that time a full tear down and complete rebuild should be in order. The Purple People Eater will ride again... January 2011 can't come soon enough.
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#10
11-17-2006, 01:23 AM
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Re: Max boost on stock bottom end
Hey man, even the smallest of motors can break rods. Power doesn't break shit, stupidity does!! (No in my case though
)
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95 Talon TSI AWD 97 Eclipse GST
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#11
11-17-2006, 03:09 PM
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Re: Max boost on stock bottom end
I know the hp rating but, I was told high boost causes alot of strain on the motor (duh). I told my friend I was planning on pushing about 24psi of boost or where ever my turbo reaches full efficiency at. He told me not to run over 20psi. This kid used to be a big dsmer so I trusted that he might know a little bit but from my understanding with a built head all I have to worry about is not hitting or going over the 400hp mark.
__________________
95 GSX 5 speed 2.3L stroker bored .020 over Built head Bullseye/Borg Warner T04B 57 Trim Turbo RNR 3" turboback w/ o2 eliminator 255 lph Extreme Motorsports fuel pump Extreme Motorsports mbc SAFC Greddy Type S BOV FMIC (core 28x10.5x3.5) FIC 650cc fuel injectors RK Sport Fuel Pressure Regulator My Car Domain
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#12
11-17-2006, 03:17 PM
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Re: Max boost on stock bottom end
I have been waiting on somebody to catch that. I read your post about max boost and everybody was giving you hp rating. lol
Anyways... I have seen people safely run 24psi on a stock bottom end, so I would assume your safe to that point at least. I'm only gonna run 20psi on the streets with my monster even though I know it'll handle a lot more than that. Look at it this way. If you run too much boost and mess something up, then it just gives you a good reason to rebuild it stronger. 
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-Brian
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#13
11-17-2006, 03:42 PM
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Re: Max boost on stock bottom end
True, but boost and HP are intertwined. You could run 20psi on a t-25 all day but if you slapped on a 60-1 and cranked it up to 20psi, I think something would fly through the hood on a stock bottom end. So I would say 20-25 psi because I doubt you're running a GT35r. What turbo are you planning on running?
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95 Talon TSI AWD 97 Eclipse GST
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#14
11-17-2006, 07:41 PM
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Re: Max boost on stock bottom end
I will still be running the current turbo that is on my car. It has similiar flow charts as a big 16 I believe. We never really identified it. I have ran 24psi once and it pulled a hell of a lot harder and held fine but, that was just for one pull and before my new head/headgasket. I plan on logging the lb/min flow and stop turning up the boost when the flow stops increasing.
__________________
95 GSX 5 speed 2.3L stroker bored .020 over Built head Bullseye/Borg Warner T04B 57 Trim Turbo RNR 3" turboback w/ o2 eliminator 255 lph Extreme Motorsports fuel pump Extreme Motorsports mbc SAFC Greddy Type S BOV FMIC (core 28x10.5x3.5) FIC 650cc fuel injectors RK Sport Fuel Pressure Regulator My Car Domain
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#15
11-17-2006, 07:59 PM
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Re: Max boost on stock bottom end
I did post the Boost. It said 36psi on his 60trim. Boost is a stupid way of looking at the question. It's not about boost, it's about airflow. Airflow=power. Their is a mechanical limit to the internals, and it is obviously close to 550hp. What ever "boost" it takes you to get this is upto the turbo you use.
So, I guess the real question is. At what point on what turbo will the mechanical effency of our 7bolt blocks fail?
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DSM geek
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