FI Bench Racing....
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Safety Car
Joined: Jul 2004
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From: Valrico Florida
FI Bench Racing....
Say the RWHP/RWTQ goal is 750/750 and you have identical shortblocks and heads, but one has twin 58mm turbos and the other has GT35R turbos with the same A/R's... Also assume both turbos are ball bearing. All being equal as in optimized and the appropriate cams for each car. They can either be A4 or M6. Which do you think would get down the track the fastest?
Last edited by Vince99FRC; May 9, 2008 at 10:31 AM.
Instructor
Joined: Sep 2007
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From: the SHORT bus,Tampa FloriDUH
A4 will if it is built, as the human simply can not shift as quickly as an auto can, period.
but on the turbocharger part, do you have flow charts for each?
but on the turbocharger part, do you have flow charts for each?
Last edited by turbo-max; May 9, 2008 at 10:18 AM.
Thread Starter
Safety Car
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From: Valrico Florida
GT35R information:
http://www.turbobygarrett.com/turbob...R_714568_2.htm
58mm T3/T4 turbo compressor maps are here..
http://www.turboneticsownersclub.com/viewtopic.php?t=17
http://www.turbobygarrett.com/turbob...R_714568_2.htm
58mm T3/T4 turbo compressor maps are here..
http://www.turboneticsownersclub.com/viewtopic.php?t=17
Tech Contributor
Joined: Apr 2007
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From: Forney Texas
The smaller turbos would be quicker. Reason: they spool faster. Now if the equation changed a little, I would say the larger turbos because they will make more power due to more efficient compressor at the same boost and flow rate, but that doesn't come into play since the power is capped at 750
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Thread Starter
Safety Car
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From: Valrico Florida
Melting Slicks
Joined: Mar 2003
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From: Macomb MI
In theory, If they make the same power they will run the same 
.
Its the old, whats heavier, 1lb of feathers or 1lb of lead.
But in general the exhaust housing and its response will dictate the winner all else being the same.
Phil
PS now, if your digging to figure out which turbos would be better you have no where near enough information listed to support any argument
. Its the old, whats heavier, 1lb of feathers or 1lb of lead.
But in general the exhaust housing and its response will dictate the winner all else being the same.
Phil
PS now, if your digging to figure out which turbos would be better you have no where near enough information listed to support any argument
Melting Slicks
Joined: Feb 2006
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From: LAS VEGAS NV
St. Jude Donor '08
Thread Starter
Safety Car
Joined: Jul 2004
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From: Valrico Florida
Yes I am trying to spark some kind of debate...
The GT35R per that link I posted has several A/R's and appears to flow around 57 to 60lbs/min if I am reading that graph right. We are going to use the .82 A/R for this discussion. BUT!!! Staying with 750/750 I think that might be kind of mute when comparing it against a 58mm inducer and 76mm exducer BB turbo with the same .82 A/R flowing around 55lbs to 57lbs max.
My thoughts are via power delivery between the two turbos. I would think, but not actually know, since this is all hypothetical, that the smaller turbo would get you moving faster and it will make more power under the curve, hence producing a faster track time.
Probably one of the reasons for an auto Supra a 67 to 71mm turbo is best suited for quicker times than a 74 to 80mm turbo on boost alone.
Le Mans Master
Joined: Sep 2001
Posts: 8,840
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From: State of Confusion.
I'd think that the A4 version would beat the stick version because of torque multiplication and shift extension of the converter..........That and I've never seen an A4 miss a shift (unless it blew up! 
).
As far as turbo's go, there are too many variables to say which would run better.
).As far as turbo's go, there are too many variables to say which would run better.
Le Mans Master
Joined: Sep 2000
Posts: 6,976
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From: Clouds Over California
The smaller turbos would be quicker. Reason: they spool faster. Now if the equation changed a little, I would say the larger turbos because they will make more power due to more efficient compressor at the same boost and flow rate, but that doesn't come into play since the power is capped at 750
Street setups look for more of a mid to redline powerband.
Towing setups from low to mid rpms.
The thing that is nice about a v8 is that you still have a v8 when not in boost. You just move right from NA into boost...very progressive when the kit is designed and the turbos are sized correctly the cfm requirements of the motor and hp level.
Look at how many centrifugal S/Cs there are in the 9s on this forum. I think there are probably more then the turbo setups...and they are almost all about peak numbers.....they just have to be geared a little lower to make up a little more on the bottom end and keep the rpms from falling off between shifts.
In theory, If they make the same power they will run the same .
Its the old, whats heavier, 1lb of feathers or 1lb of lead.
But in general the exhaust housing and its response will dictate the winner all else being the same.
Phil
PS now, if your digging to figure out which turbos would be better you have no where near enough information listed to support any argument
. Its the old, whats heavier, 1lb of feathers or 1lb of lead.
But in general the exhaust housing and its response will dictate the winner all else being the same.
Phil
PS now, if your digging to figure out which turbos would be better you have no where near enough information listed to support any argument
Last edited by Shinobi'sZ; May 9, 2008 at 06:58 PM.
Melting Slicks
Joined: Feb 2006
Posts: 3,191
Likes: 43
From: Scottsdale Az
The smaller turbos would be quicker. Reason: they spool faster. Now if the equation changed a little, I would say the larger turbos because they will make more power due to more efficient compressor at the same boost and flow rate, but that doesn't come into play since the power is capped at 750
In this case the bigger turbos will produce more power under the curve and have the quicker time.
Le Mans Master
Joined: Oct 2003
Posts: 8,863
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From: PA
St. Jude Donor '08
how about this vince.......screw the gt35 and wait to get ur hands on this GT.....
smoked the base GT and that inturned smoked the zr-1 @ the ring..
byebye 996tt
http://www.leftlanenews.com/nissan-gt-r-v-spec.htm
smoked the base GT and that inturned smoked the zr-1 @ the ring..
byebye 996tt
http://www.leftlanenews.com/nissan-gt-r-v-spec.htm
Le Mans Master
Joined: Sep 2000
Posts: 6,976
Likes: 527
From: Clouds Over California
how about this vince.......screw the gt35 and wait to get ur hands on this GT.....
smoked the base GT and that inturned smoked the zr-1 @ the ring..
byebye 996tt
http://www.leftlanenews.com/nissan-gt-r-v-spec.htm
smoked the base GT and that inturned smoked the zr-1 @ the ring..
byebye 996tt
http://www.leftlanenews.com/nissan-gt-r-v-spec.htm
I betcha it has a good alternator too.