What's a good A/R combination?
07-10-2006, 07:59 PM
#1
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What's a good A/R combination? hey i'll be shopping for a turbo soon but i wanna know wat AR combination is everyone running.im looking at t70's. more then enough,but wat AR should i pick?the car is a 98 ss all stock with an automatic tranny and it will be a daily driver.i want around 500rwhp and nice strong powerband all the way through 6500 rpms
07-11-2006, 02:28 PM
#6
Originally Posted by ls1king000
What a/r for twins? Innovative or gt40s
stock motor now
later 370, 6.0 heads
3.10 or 3.20 gear
stock motor now
later 370, 6.0 heads
3.10 or 3.20 gear
07-11-2006, 02:29 PM
#7
Originally Posted by MiaSSmaro98
.96 on the exhaust turbine correct?wat about the front?
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07-11-2006, 02:39 PM
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the compressor a/r is not as versatile as the turbine a/r. Basically, since the compressor side doesn't really change much in turbo dynamics, the turbo manufactures will leave it at a set "baseline".
However, the turbine a/r is where the magic is at and where the a/r talk is guided at.
The higher the ratio, the more peak power you will attain while compromising a bit of turbo response. The lower, well, you get the opposite....
Now, ppl are running a .96 single setup. On a twin, theoretically, you should expect that turbo to spool slower, corrrect? So, with a 408 twin setup, should you consider running a lower a/r (let say on a t70-t76) or stick with it .96 since the motor is also pushing alot more air per bank?
I would like to match a pair of super-t's t70's or t-72's .96a/r.
However, the turbine a/r is where the magic is at and where the a/r talk is guided at.
The higher the ratio, the more peak power you will attain while compromising a bit of turbo response. The lower, well, you get the opposite....
Now, ppl are running a .96 single setup. On a twin, theoretically, you should expect that turbo to spool slower, corrrect? So, with a 408 twin setup, should you consider running a lower a/r (let say on a t70-t76) or stick with it .96 since the motor is also pushing alot more air per bank?
I would like to match a pair of super-t's t70's or t-72's .96a/r.
07-11-2006, 03:26 PM
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i had the .96 and i could not stand it - big lag but it made good power on top end. i switched to a .81 and it is much more fun , quicker boost just great on my auto trans daily driver car. 
.81
.81
07-11-2006, 04:21 PM
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twin t-64s ceramic bearing
350 cubes
.81 A/R turbines(on center housings)
starts boosting around 3300rpm pulls hard to 7000
works good on the street. backpressure matches boost
350 cubes
.81 A/R turbines(on center housings)
starts boosting around 3300rpm pulls hard to 7000
works good on the street. backpressure matches boost
07-11-2006, 05:59 PM
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Originally Posted by smoke20
i had the .96 and i could not stand it - big lag but it made good power on top end. i switched to a .81 and it is much more fun , quicker boost just great on my auto trans daily driver car. .81
.81
07-11-2006, 09:31 PM
#18
Originally Posted by nitrorocket
.96 is WAY too big for a twin setup, Use .68 housings. Also, t70 is way too klarge for only 500 rwhp. Use 60-1 hi-fi's or similar.
Really?? I'm running twin 67's with .96 A/R. Boost comes in at about 3500, carries to red line (what ever I want, right now 6800, but easily could be 7200). No problems what so ever on getting boost. NO LAG. Launch off trans-brake is fun again. My HP and times are in my signature.
David