346 Build-up WHOLE LOTTA ?'s
03-16-2006, 09:44 AM
#1
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346 Build-up WHOLE LOTTA ?'s Okay, I'm serious now... I came across a briefcase full of money. 
There are some Cobra's around here that are spanking me.
Please help me out and answer as many questions as you can:
1. For ~750 rwhp on pump gas, would running no meth (FMIC, of course, though) be slightly stupid, very stupid, or not that stupid. CR would be VERY low of course. Displacement would be a 346-347... my stock motor, basically, with GOOD internals and a decent set of heads... a C5 Z06 cam, too.
2. On a 346... for this app... how's the spool on a T-76GTS turbo? What would be a good WG to pair it with?
3. Stock PCM... could I still use mine for that power level?
4. What would be the best techniques to address crankcase pressure/blowby?
5. I'm currently running 60# injectors... May I continue to run these?
6. What would be a good clutch for this set-up, currently running a Spec stage 3 clutch... Need to upgrade, huh? To what, though?
I know it's alot of questions... I tried to make them as concrete and "tech" relevant as possible, questions that could benefit ALL here, really, though I could really use your help for my plans. Thanks in advance guys.
-Alcides
There are some Cobra's around here that are spanking me.
Please help me out and answer as many questions as you can:
1. For ~750 rwhp on pump gas, would running no meth (FMIC, of course, though) be slightly stupid, very stupid, or not that stupid. CR would be VERY low of course. Displacement would be a 346-347... my stock motor, basically, with GOOD internals and a decent set of heads... a C5 Z06 cam, too.
2. On a 346... for this app... how's the spool on a T-76GTS turbo? What would be a good WG to pair it with?
3. Stock PCM... could I still use mine for that power level?
4. What would be the best techniques to address crankcase pressure/blowby?
5. I'm currently running 60# injectors... May I continue to run these?
6. What would be a good clutch for this set-up, currently running a Spec stage 3 clutch... Need to upgrade, huh? To what, though?
I know it's alot of questions... I tried to make them as concrete and "tech" relevant as possible, questions that could benefit ALL here, really, though I could really use your help for my plans. Thanks in advance guys.
-Alcides
03-16-2006, 09:58 AM
#2
for 750 your going to have to run some octane booster if you only want to use 346 cubes
T76gts should spool well and meet your goals (maybe 3500rpm full boost?)
you can use the stock computer but id get HPT 3 bar setup
vents to a catch can should help with the blowby
60# should be enough
maybe a mcloud twin for a clutch.
T76gts should spool well and meet your goals (maybe 3500rpm full boost?)
you can use the stock computer but id get HPT 3 bar setup
vents to a catch can should help with the blowby
60# should be enough
maybe a mcloud twin for a clutch.
03-16-2006, 11:26 AM
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Originally Posted by smokinHawk
for 750 your going to have to run some octane booster if you only want to use 346 cubes
T76gts should spool well and meet your goals (maybe 3500rpm full boost?)
you can use the stock computer but id get HPT 3 bar setup
vents to a catch can should help with the blowby
60# should be enough
maybe a mcloud twin for a clutch.
T76gts should spool well and meet your goals (maybe 3500rpm full boost?)
you can use the stock computer but id get HPT 3 bar setup
vents to a catch can should help with the blowby
60# should be enough
maybe a mcloud twin for a clutch.
Good stuff. I hear good things about the Mcloud (sp?) twin.
I'll be printing all this info. for my plans, so I really do appreciate all of it.
03-16-2006, 11:52 AM
#7
i still think 700 might be a little high for pump, you will have to keep cranking it up till you get some knock then back it down to find the threashold. Im guessing it would be around 650ish at 8:1, but youll just have to turn it up to find out
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03-16-2006, 11:55 AM
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Cool... I just wanted a good "estimated" threshold, though, to get me started. How do the stock fuel rails hold up to a 650-ish rwhp level? How does my Walbro 255 pump hold up, too? Injectors fine?
03-18-2006, 01:25 PM
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750 rwhp not a problem with a forged motor and either turbos or a DS1C or F1R and Meth. I know I stopped just short of that with my forged 346 A&A DS1C Meth machine. I built for 6800+ and when we got 742 at 6200 I decided to stop and that is where the rev limiter is set, so it can be done on pump gas and Meth. Oh my timing was 16 degrees and AFR in the 11.5-11.8 range. If I was a big track guy I would have upped the rev limiter and seen what I could get, however this is one sick street car and spinning tires till 4th is now the issue 
03-18-2006, 07:59 PM
#14
Originally Posted by peter pan
750 rwhp not a problem with a forged motor and either turbos or a DS1C or F1R and Meth. I know I stopped just short of that with my forged 346 A&A DS1C Meth machine. I built for 6800+ and when we got 742 at 6200 I decided to stop and that is where the rev limiter is set, so it can be done on pump gas and Meth. Oh my timing was 16 degrees and AFR in the 11.5-11.8 range. If I was a big track guy I would have upped the rev limiter and seen what I could get, however this is one sick street car and spinning tires till 4th is now the issue
How many #'s are you running with this setup on the street?
03-19-2006, 11:44 AM
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Originally Posted by 52172
what kind of power are these cobras making? Your t-70 should take care of a KB cobra.
03-19-2006, 11:46 AM
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Originally Posted by peter pan
750 rwhp not a problem with a forged motor and either turbos or a DS1C or F1R and Meth. I know I stopped just short of that with my forged 346 A&A DS1C Meth machine. I built for 6800+ and when we got 742 at 6200 I decided to stop and that is where the rev limiter is set, so it can be done on pump gas and Meth. Oh my timing was 16 degrees and AFR in the 11.5-11.8 range. If I was a big track guy I would have upped the rev limiter and seen what I could get, however this is one sick street car and spinning tires till 4th is now the issue
I didn't know a T-70 could be wound up for that power.
04-04-2006, 09:50 AM
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What should be my limit/goal for this turbo? (boost/rwhp)
I'm trying not to consider the t-76 too much the more I think about it because:
A. I won't be running race gas.
B. I won't be going over 346/347.
C. As I reach the max for the 346 safely on pump gas (~650 rwhp?), I'd hate to find I could have gotten there with the turbo I have now (neatly, without top-end drop-off), having spent big $$$ for nothing on the T-76GTS. What do you guys think about my reasoning? Not race car, just a nice highway cruiser on pump gas...
I'm trying not to consider the t-76 too much the more I think about it because:
A. I won't be running race gas.
B. I won't be going over 346/347.
C. As I reach the max for the 346 safely on pump gas (~650 rwhp?), I'd hate to find I could have gotten there with the turbo I have now (neatly, without top-end drop-off), having spent big $$$ for nothing on the T-76GTS. What do you guys think about my reasoning? Not race car, just a nice highway cruiser on pump gas...
04-04-2006, 10:15 AM
#20
Good question !!!
Originally Posted by 777
Don't mean to hi-jack, but just a little addition to your thread. How much more power could you get out of a 402 with the same limitations. Another 50rwhp? More?