my new secret weapon(s) :-)
Thread Starter
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Joined: Aug 2001
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From: houston
wow!!!
i did not expect so many responses!! ia m going to try and answer everyones questions so this is going to be along post!!
FD racer....
can you explain a little deeper as to how twins do this? i know vinny ten went from a single to twins, and now he's back to a single again. he says his big single flows more cfm at lower boost than his twins.
Vinney does not the exhaust energy that we do and cannot spool large enough twins to make the difference my compressor wheels are bigger than the ones hw was trying to use, anothe issue i have is that to run a large enough single to make the numbers at boost level i prefer i would have a hard time getting it to spool fast enough for a pro light. remember i am auto matic and can spool anything but it takes time.
Barwick.....
I would think it'd be bigger for a rotary, because they usually flow more air than a 1.3L piston engine don't they?
YES, i feel that twins are the NEW secret for rotaries as long as you can fit them, we make enough energy to spool pretty much anything and since backpressure is our common enemy , twins all but eliminate it.
Setzep...
I'm sorry, I must have worded my question wrong. I meant to ask how is it possible to have more boost pressure than exhaust pressure? I can see how you could get close to having the same pressure (in the exhaust manifold and after the turbos outlet on the compressor) but just don't see how it's possible to have less pressure in the exhaust manifold than after the turbo I understand the back pressure comment and how more will cause less hp and more detonation.
think of it this way: your turbo cannot pressurize the air on the outside of the car can it? so eventually it has to go back to atmospheric! so it IS controllable through the exhaust.
Feared.....
i have been plsying around with BP ratios for a while now and for some reason on a piston engine the ratio is not so delicate but on a Bridge Ported rotary BP is the key to making power. i hope that you meant 3:1 with the intake side being 3 because i will tell you that while experimenting with Turbine housings i ran 30 psi and ended up with 45 on the BP side!!!! the car ran like **** and made more power at 20 psi and dropped a full second ( 10.40), when i dropped the boost back down to where it had a 1:1 ratio (20 psi) the car went back to the 9.40's. remember pressure,volume and velocity are all different. you CAN have less back PRESSURE and more velocity and still spool the turbo with no problems.
i will have more pics next week after i get my electric water pump installed and the charge pipes done. the radiator sits right in front of the dr side tire. i am expectig full spool by 5k. here is apic of the old setup with the radiator:
FD racer....
can you explain a little deeper as to how twins do this? i know vinny ten went from a single to twins, and now he's back to a single again. he says his big single flows more cfm at lower boost than his twins.
Vinney does not the exhaust energy that we do and cannot spool large enough twins to make the difference my compressor wheels are bigger than the ones hw was trying to use, anothe issue i have is that to run a large enough single to make the numbers at boost level i prefer i would have a hard time getting it to spool fast enough for a pro light. remember i am auto matic and can spool anything but it takes time.
Barwick.....
I would think it'd be bigger for a rotary, because they usually flow more air than a 1.3L piston engine don't they?
YES, i feel that twins are the NEW secret for rotaries as long as you can fit them, we make enough energy to spool pretty much anything and since backpressure is our common enemy , twins all but eliminate it.
Setzep...
I'm sorry, I must have worded my question wrong. I meant to ask how is it possible to have more boost pressure than exhaust pressure? I can see how you could get close to having the same pressure (in the exhaust manifold and after the turbos outlet on the compressor) but just don't see how it's possible to have less pressure in the exhaust manifold than after the turbo I understand the back pressure comment and how more will cause less hp and more detonation.
think of it this way: your turbo cannot pressurize the air on the outside of the car can it? so eventually it has to go back to atmospheric! so it IS controllable through the exhaust.
Feared.....
i have been plsying around with BP ratios for a while now and for some reason on a piston engine the ratio is not so delicate but on a Bridge Ported rotary BP is the key to making power. i hope that you meant 3:1 with the intake side being 3 because i will tell you that while experimenting with Turbine housings i ran 30 psi and ended up with 45 on the BP side!!!! the car ran like **** and made more power at 20 psi and dropped a full second ( 10.40), when i dropped the boost back down to where it had a 1:1 ratio (20 psi) the car went back to the 9.40's. remember pressure,volume and velocity are all different. you CAN have less back PRESSURE and more velocity and still spool the turbo with no problems.
i will have more pics next week after i get my electric water pump installed and the charge pipes done. the radiator sits right in front of the dr side tire. i am expectig full spool by 5k. here is apic of the old setup with the radiator:
Thread Starter
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Joined: Aug 2001
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From: houston
here are a few pics of a street FD that i just finished installing twin hybrids, i have to do the fuel system this coming week and then i should have some figures power wise after that.
Damn thats awesome
Newbie
Joined: Apr 2001
Posts: 2
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From: Austin, Tx
Originally posted by turbostreetfighter
here are a few pics of a street FD that i just finished installing twin hybrids, i have to do the fuel system this coming week and then i should have some figures power wise after that.
here are a few pics of a street FD that i just finished installing twin hybrids, i have to do the fuel system this coming week and then i should have some figures power wise after that.
Thread Starter
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Joined: Aug 2001
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From: houston
the car does no t see much time on the streets during the week so we only put the filters on whenever he plans on doing some distance driving. the last setup i did lost 12 h.p. just by using filters!!!! teh airbox and IC take up most of hte space under the hood.
MWW
MWW
W. TX chirpin Monkey
Joined: Sep 2001
Posts: 2,684
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From: Mesquite, TX
Marcus you are a MADMAN.......is the setup you wrote me about. I've seen a pic of a 1 st gen with twin Hybrids, that were stacked almost on top of each other, and i've heard that there are setups for the FC as well. Hope to see you this next season. it'll have to be Gainesville, since i now moved.
'Tuna'
Joined: Feb 2001
Posts: 4,637
Likes: 3
From: Miami,Fl,USA
Hey Marcus!
Everything looks sweet!:
Hope to see you running soon!
btw. The intake manifold looks familar.
I'm on the dyno presently and the results are very interesting! Let's say Methanol does amazing things for power and reliability!
crispeed
87 Rx-7 TII
9.204@150.47mph
2600lbs
un-tubbed
Everything looks sweet!:
Hope to see you running soon!
btw. The intake manifold looks familar.
I'm on the dyno presently and the results are very interesting! Let's say Methanol does amazing things for power and reliability!
crispeed
87 Rx-7 TII
9.204@150.47mph
2600lbs
un-tubbed
Rotary Freak
Joined: Aug 2001
Posts: 1,734
Likes: 0
From: maryland
Originally posted by crispeed
I'm on the dyno presently and the results are very interesting! Let's say Methanol does amazing things for power and reliability!
crispeed
87 Rx-7 TII
9.204@150.47mph
2600lbs
un-tubbed
I'm on the dyno presently and the results are very interesting! Let's say Methanol does amazing things for power and reliability!
crispeed
87 Rx-7 TII
9.204@150.47mph
2600lbs
un-tubbed
Thread Starter
Senior Member
Joined: Aug 2001
Posts: 445
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From: houston
mr rx7 tt...
Marcus,
What numbers is he making and how quick is the spool on those...? Also, Have you thought about making a kit and marketing it..?
Chris
i am having issues with the haltech and its secondary injector drivers so i have not gotten any figures on h.p. but i will say that it spools quicker than aT78 and makes full boost by 3800, i have not been able to rev over 6k but up to that point it is insane!!
crispeed....
Hey Marcus!
Everything looks sweet!:
Hope to see you running soon!
i will be on the dyno by this saturday or monday!
btw. The intake manifold looks familar.
i ripped the other one apart... i think my TB is larger than yours and my plenum is also larger ( i think, it is hard to tell by pics)
I'm on the dyno presently and the results are very interesting! Let's say Methanol does amazing things for power and reliability!
HELL YEAH!!! i am amazed at how much beating you can do on the engine and nothing gets hurt as long as you run enough premix ( i siezed the first engine due to lack of lubrication!!!) pretty much just watch the EGTs and hold on!! during my liscense passes i would just turn the BC up 5% each pass until i got where i wanted to be, a few times i ran around 2.7 bar on accident but nothing got hurt!! i am hooked on methanol for sure
MWW
Marcus,
What numbers is he making and how quick is the spool on those...? Also, Have you thought about making a kit and marketing it..?
Chris
i am having issues with the haltech and its secondary injector drivers so i have not gotten any figures on h.p. but i will say that it spools quicker than aT78 and makes full boost by 3800, i have not been able to rev over 6k but up to that point it is insane!!
crispeed....
Hey Marcus!
Everything looks sweet!:
Hope to see you running soon!
i will be on the dyno by this saturday or monday!
btw. The intake manifold looks familar.
i ripped the other one apart... i think my TB is larger than yours and my plenum is also larger ( i think, it is hard to tell by pics)
I'm on the dyno presently and the results are very interesting! Let's say Methanol does amazing things for power and reliability!
HELL YEAH!!! i am amazed at how much beating you can do on the engine and nothing gets hurt as long as you run enough premix ( i siezed the first engine due to lack of lubrication!!!) pretty much just watch the EGTs and hold on!! during my liscense passes i would just turn the BC up 5% each pass until i got where i wanted to be, a few times i ran around 2.7 bar on accident but nothing got hurt!! i am hooked on methanol for sure
MWW
Thread Starter
Senior Member
Joined: Aug 2001
Posts: 445
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From: houston
oh yeah?
as far as making a twin turbo kit???? NOWAY!! it is a royal pain in the *** and unless someone wants to shell out 7k for a kit and ship the car to me i am not going to do it
but it does work rather well
MWW
but it does work rather well
MWW
Eats, Sleeps, Dreams Rotary
iTrader: (1)
Joined: Jul 2001
Posts: 3,383
Likes: 3
From: Stinson Beach, Ca
Marcus, what do you mean by BP? Boost Pressure? I realized you're not talking about BridgePorts (or so I think you aren't).
BTW, great thread
*EDIT*
Or do you mean BackPressure?
BTW, great thread
*EDIT*
Or do you mean BackPressure?
Last edited by Node; Nov 20, 2002 at 08:36 PM.
Thread Starter
Senior Member
Joined: Aug 2001
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From: houston
Node....i mean backpressure!
thanx, 680
well today i got it back running and was able to get it to make full boost on the trans brake. it builds boost fast and by 5000 it was at full boost but by 6k it was crankin!! my stall convertor flashed to over 6780 and i let go of the button before it went any higher and it felt like it was going!!! what this means to me is that it is making more torque, since convertors are built around certain torque figures. it is supposed to stall at 5500 with 550 ft/lbs of torque so my convertor sponser tells me that it is making around 660 ft/lbs of to torque!! another good thing is that at 20 psi of boost i am only getting 14 psi of Backpressure!! here is a pick of the complete system. i will go to the dyno saturday or monday to make sure it will make it all the way down the track
thanx, 680
well today i got it back running and was able to get it to make full boost on the trans brake. it builds boost fast and by 5000 it was at full boost but by 6k it was crankin!! my stall convertor flashed to over 6780 and i let go of the button before it went any higher and it felt like it was going!!! what this means to me is that it is making more torque, since convertors are built around certain torque figures. it is supposed to stall at 5500 with 550 ft/lbs of torque so my convertor sponser tells me that it is making around 660 ft/lbs of to torque!! another good thing is that at 20 psi of boost i am only getting 14 psi of Backpressure!! here is a pick of the complete system. i will go to the dyno saturday or monday to make sure it will make it all the way down the track
Last edited by turbostreetfighter; Nov 21, 2002 at 06:26 PM.
