Twin GT28r Turbo Kit Pics
08-20-07, 06:42 PM
#228
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I looked under my car yesterday and noticed it will take some work to have an exhaust on the left side. It is going to be dual 3" piping from the front to the back. I bought some HKS carbon TI mufflers for it. For the wastegate, I bought an HKS GT wastegate. Not sure about the air filters though. My HKS EVC V just arrived today so I have to go drop it off this weekend, hopefully there will be something to talk about this weekend.
08-23-07, 08:42 PM
#229
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the beginning of this thread really motivates me to head toward twins instead of a larger single, as this is a dd, but now im not really sure....
the other problem is that there arent too many twin setups for fc's.. but i dont mind a little custom work here and there.. haha.
the other problem is that there arent too many twin setups for fc's.. but i dont mind a little custom work here and there.. haha.
01-20-08, 01:10 PM
#233
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Doesn't mean i want this kit any less. I was just kind hoping that whom ever was building the kit can divulge some info on the manifold at the least. I wanted to do something right along these lines so...
The only thing I didn't really like was the internal wastegates but as far as simplicity goes it a good idea. Can anyone hook me up with any info that they might have on a similar manifold? I want to get the planning going on my 7.
Thanks anyone who is still subscribed to this thread.
The only thing I didn't really like was the internal wastegates but as far as simplicity goes it a good idea. Can anyone hook me up with any info that they might have on a similar manifold? I want to get the planning going on my 7.
Thanks anyone who is still subscribed to this thread.
06-16-08, 07:09 PM
#235
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I know that this is a 3 yr old thread and all but hopefully someone out there can answer my question...is this GT28R Turbo Kit better than the BNR stage 3 Turbo's? I was planning on getting the BNR stage 3, then I saw the GT28R Turbo Kit at http://www.rx7store.net/category_s/339.htm and was impressed by his #'s on twins. Then again I don't know what boost he's running on and all that crap. And whats this about it being more expensive to install than a single turbo upgrade? I mean in my opinion if it can spool alot faster and have better top end then a single I wouldn't mind paying a little more than a single turbo setup. But then again...how's the rebuild for the GT28R Turbo's? Ah crap...I hate this...too many questions so I'll stop 
06-16-08, 07:44 PM
#236
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I know that this is a 3 yr old thread and all but hopefully someone out there can answer my question...is this GT28R Turbo Kit better than the BNR stage 3 Turbo's? I was planning on getting the BNR stage 3, then I saw the GT28R Turbo Kit at http://www.rx7store.net/category_s/339.htm and was impressed by his #'s on twins. Then again I don't know what boost he's running on and all that crap. And whats this about it being more expensive to install than a single turbo upgrade? I mean in my opinion if it can spool alot faster and have better top end then a single I wouldn't mind paying a little more than a single turbo setup. But then again...how's the rebuild for the GT28R Turbo's? Ah crap...I hate this...too many questions so I'll stop
11-05-08, 09:21 AM
#243
I'll build one, fully v-banded and stainless, using twin tial housings and 44mm gates, you going to pay me for it
Been thinking about it for awhile now. Most people want it, but most wont pay for it. We played with the setup a long time ago, performance per dollars spent becomes the issue.
Last edited by Zero R; 11-05-08 at 12:13 PM.
11-08-08, 08:30 PM
#248
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can you find the second turbo?
2008 UPDATE:
things are looking up in 08 for my twin TO4 turbo project. last year was the first year on the dyno. we did 3 dyno sessions each averaging 4+ hours w ace tuner Luke Stubbs at BeyondRedline Green Bay Wisconsin.
challenges for 07 were tuning my Alkycontrol 100% methanol AI system and dealing w a declining torque curve after a decent ascent. due to a few problems real and illusory we were only able to tune to about 15.8 psi and made about 420/360. i did switch the rear turbines from stage 3 to stage 5 in the middle of the 07 process.
7/29/08-- i was back on the (new) eddy current Beyond Redline dyno. we made 23 2000-8000 4th gear pulls.
the big new deal was a new generation alcohol system from FJO. unlike most systems which use nozzles the FJO system uses fuel injectors. nozzles are great for watering your lawn. fuel injectors are great for precisely tuning your motor. as in milliseconds of "ontime."
here's what the tuning table looks like. the values are % of max deliverability.
the older gen (spray and pray) systems work o k for drag racing where your right foot is always on the floor. since the only variability as to delivery is an electric pump they really can't parallel fuel needs on a road course where you are always on and off the gas.
(if you are just using the setup to spray water to cool your engine they are fine... if you are partially fueling your engine w magic methanol on the street or a road course.... no way)
anyway, i was on the dyno initially in july. we found that the alcohol pressure behind the injectors (2 700 CC/Min) was varying and with it our AFRs.
back to the drawing board.
remove Shurflow pump. insert a Bosch variant of the 044.... the 909. add a Weldon Adj alcohol compatible pressure regulator. add return to AI fuel cell line.
result: absolutely constant alcohol line pressure and back to tuning on the dyno.
9/23/08-- we did 23 runs. after the first run we never even thought about the alcohol system. it was there. it was constant. and combined w pump 93 octane it was magic.
20 pounds of boost. PFC knock reading between 7000 and 8000 was between 10 and 20! on pump gas
my descending torque readings from last year have vanished. i spent too much time chasing that last year. it turned out to be boost related.
BTW, my exhaust backpressure at 20 psi boost is 21!!!!
my turbos are designed to put out 82-84 pounds per minute at 27 psi. unfortunately, my actuator springs are maxxed at 20 psi. i am using the stock FD actuators adapted to my ATP Ultimate Wastegates. they do 10 psi w the boost controller turned off.
i removed one of them with the idea of screwing the rod in to make it shorter and preload the actuator spring for more boost but found the travel to be only .31 inches. if i were to shorten the rod to stiffen the spring i would lose travel and probably WG flow so i will need to find stiffer (different) actuators.
since i want to get ontrack in the next few weeks 27 psi and 630 rw will have to wait.
i made 498 at 20 psi but do expect i can raise the output a bit as i am conservative on timing at 12 degrees w 11 split. further, my lead plug (NGK R6725 10.5 heat range) is black and oily. i am going to a hotter plug in the lead only.
finally, we have been tuning too cold on the egts. the target temps pre turbo have been 1420 F for spool and 1550 F at target boost. actually these are the temps for 100% meth (no gasoline at all)... so we will bump EGTs a bit since 70% of my fuel is 93 octane gasoline and we have seen zero knock.
it looks like my twins are proving out V my target. spool is either the same or slightly better than a recently posted GT42.
i really don't want 400 rw at 5000 anyway as it would be more difficult to drive on a road course.
the setup is great around town and should be exciting when it finally gets tuned out.
stay tuned more to come this year. OBTW, i have about 14,000 miles on my twins. and my motor has been in my car for 4 years now... 0ver 100 dyno pulls and it reads 17 inches of vacuum at idle.
pics of my FJO setup in the Auxiliary Injection section.
09 plan is a Tremec T56 6 speed and an assault on 200 mph at the Texas Standing Mile.
hc
2008 UPDATE:
things are looking up in 08 for my twin TO4 turbo project. last year was the first year on the dyno. we did 3 dyno sessions each averaging 4+ hours w ace tuner Luke Stubbs at BeyondRedline Green Bay Wisconsin.
challenges for 07 were tuning my Alkycontrol 100% methanol AI system and dealing w a declining torque curve after a decent ascent. due to a few problems real and illusory we were only able to tune to about 15.8 psi and made about 420/360. i did switch the rear turbines from stage 3 to stage 5 in the middle of the 07 process.
7/29/08-- i was back on the (new) eddy current Beyond Redline dyno. we made 23 2000-8000 4th gear pulls.
the big new deal was a new generation alcohol system from FJO. unlike most systems which use nozzles the FJO system uses fuel injectors. nozzles are great for watering your lawn. fuel injectors are great for precisely tuning your motor. as in milliseconds of "ontime."
here's what the tuning table looks like. the values are % of max deliverability.
the older gen (spray and pray) systems work o k for drag racing where your right foot is always on the floor. since the only variability as to delivery is an electric pump they really can't parallel fuel needs on a road course where you are always on and off the gas.
(if you are just using the setup to spray water to cool your engine they are fine... if you are partially fueling your engine w magic methanol on the street or a road course.... no way)
anyway, i was on the dyno initially in july. we found that the alcohol pressure behind the injectors (2 700 CC/Min) was varying and with it our AFRs.
back to the drawing board.
remove Shurflow pump. insert a Bosch variant of the 044.... the 909. add a Weldon Adj alcohol compatible pressure regulator. add return to AI fuel cell line.
result: absolutely constant alcohol line pressure and back to tuning on the dyno.
9/23/08-- we did 23 runs. after the first run we never even thought about the alcohol system. it was there. it was constant. and combined w pump 93 octane it was magic.
20 pounds of boost. PFC knock reading between 7000 and 8000 was between 10 and 20! on pump gas
my descending torque readings from last year have vanished. i spent too much time chasing that last year. it turned out to be boost related.
BTW, my exhaust backpressure at 20 psi boost is 21!!!!
my turbos are designed to put out 82-84 pounds per minute at 27 psi. unfortunately, my actuator springs are maxxed at 20 psi. i am using the stock FD actuators adapted to my ATP Ultimate Wastegates. they do 10 psi w the boost controller turned off.
i removed one of them with the idea of screwing the rod in to make it shorter and preload the actuator spring for more boost but found the travel to be only .31 inches. if i were to shorten the rod to stiffen the spring i would lose travel and probably WG flow so i will need to find stiffer (different) actuators.
since i want to get ontrack in the next few weeks 27 psi and 630 rw will have to wait.
i made 498 at 20 psi but do expect i can raise the output a bit as i am conservative on timing at 12 degrees w 11 split. further, my lead plug (NGK R6725 10.5 heat range) is black and oily. i am going to a hotter plug in the lead only.
finally, we have been tuning too cold on the egts. the target temps pre turbo have been 1420 F for spool and 1550 F at target boost. actually these are the temps for 100% meth (no gasoline at all)... so we will bump EGTs a bit since 70% of my fuel is 93 octane gasoline and we have seen zero knock.
it looks like my twins are proving out V my target. spool is either the same or slightly better than a recently posted GT42.
i really don't want 400 rw at 5000 anyway as it would be more difficult to drive on a road course.
the setup is great around town and should be exciting when it finally gets tuned out.
stay tuned more to come this year. OBTW, i have about 14,000 miles on my twins. and my motor has been in my car for 4 years now... 0ver 100 dyno pulls and it reads 17 inches of vacuum at idle.
pics of my FJO setup in the Auxiliary Injection section.
09 plan is a Tremec T56 6 speed and an assault on 200 mph at the Texas Standing Mile.
hc
