Joys of non-sequential
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Joys of non-sequential
I don't want start a sequential vs. non-sequential debate, but I just wanted to offer my recent observations after completing the www.dontbearikki.com conversion.
Simply put, I wish I had done this years ago. Incidentally, I wasn't having any turbos issues other than dangerous spiking at the transition, which is a no-no considering the road & track events that I participate in.
In general it would seem that the typical concerns regarding this modification revolve around (1) boost threshold, (2) boost lag, (3) driveability, and finally (4) noise.
For reference purposes my mods are listed here:
http://www.opentracking.com/ramon_ceron.htm
(1) My boost guage goes from vacuum to boost at 2800 rpms in 3rd gear. At this point I will immediately have 3 lbs of boost. This is MORE THAN SUFFICIENT for everyday driving. I didn't have to change my driving style/pattern as I was always around 2700 rpm when cruising because of my large street ported engine.
(2) Full boost build up (12 lbs) takes about a second and probably arrives around 3400-3600 rpms, but I haven't pinpointed the exact spot because the rush is enormous and my eyes are definitely focused on the road when this occurs. Critical point--if you are purposely racing someone on the street (poor location) or on the track you will find that your shift points are above this area and thus shouldn't present an issue.
(3) I can drive around on local roads and/or highway without all the immediate boost and still have fun. If you are NOT trying to race everyone on the street at every stoplight then driveability is not an issue. I haven't even begun modifying timing with the PFC, which would only improve low end power.
(4) Noise is the only downside for most unless you have a Racing Beat Catback. For some reason my car seems to be real loud when I merely casually run through the gears. The noise isn't bad inside the car (windows closed), but COULD be an issue for those outside (not fully verified yet). Noise under WOP is similar to when I was sequential. Noise when driving at a constant pace (e.g., highway) is basically the same as before.
Some additional comments:
(1) the conversion took less than 2 hrs.
(2) despite all that has been written up (including this thread) I would STRONGLY recommend just trying this set up if you have a full exhaust setup and lightened flywheel. It can be reversed in less than 2 hrs. Everyone's definition of lag and more importantly driving style is different. Experiencing the modification is the best way in making this judgement.
(3) my car is faster now, not because of converting to non-sequential, but because I can NOW safely run a specific boost and hold it to 8000 rpms. My car feels so strong when the boost just builds. SMOOTH is the only term that comes to mind. Anyone who consistently tracks their car should consider this modification.
(4) even lauching my car and accelerating at WOP on the streets is easier and faster as there seems to less power fluctuations and erratic "activity" (subjective feeling) when doing this. I get the same results every damn time--never thought of the value and importance of consistent power delivery before.
(5) driving on the highway isn't an issue in 5th gear as long as you are holding speed of 70+.
(6) although low end power is LESS than sequential it is not weak/low in power. It's just RELATIVELY lower.
(6) remember you are always a single downshift away from an enormous rush of power (big FULL shove in the back as opposed to two strong taps--subjective comment again).
Just another data point for those considering this modification to contemplate.
Ramon
Simply put, I wish I had done this years ago. Incidentally, I wasn't having any turbos issues other than dangerous spiking at the transition, which is a no-no considering the road & track events that I participate in.
In general it would seem that the typical concerns regarding this modification revolve around (1) boost threshold, (2) boost lag, (3) driveability, and finally (4) noise.
For reference purposes my mods are listed here:
http://www.opentracking.com/ramon_ceron.htm
(1) My boost guage goes from vacuum to boost at 2800 rpms in 3rd gear. At this point I will immediately have 3 lbs of boost. This is MORE THAN SUFFICIENT for everyday driving. I didn't have to change my driving style/pattern as I was always around 2700 rpm when cruising because of my large street ported engine.
(2) Full boost build up (12 lbs) takes about a second and probably arrives around 3400-3600 rpms, but I haven't pinpointed the exact spot because the rush is enormous and my eyes are definitely focused on the road when this occurs. Critical point--if you are purposely racing someone on the street (poor location) or on the track you will find that your shift points are above this area and thus shouldn't present an issue.
(3) I can drive around on local roads and/or highway without all the immediate boost and still have fun. If you are NOT trying to race everyone on the street at every stoplight then driveability is not an issue. I haven't even begun modifying timing with the PFC, which would only improve low end power.
(4) Noise is the only downside for most unless you have a Racing Beat Catback. For some reason my car seems to be real loud when I merely casually run through the gears. The noise isn't bad inside the car (windows closed), but COULD be an issue for those outside (not fully verified yet). Noise under WOP is similar to when I was sequential. Noise when driving at a constant pace (e.g., highway) is basically the same as before.
Some additional comments:
(1) the conversion took less than 2 hrs.
(2) despite all that has been written up (including this thread) I would STRONGLY recommend just trying this set up if you have a full exhaust setup and lightened flywheel. It can be reversed in less than 2 hrs. Everyone's definition of lag and more importantly driving style is different. Experiencing the modification is the best way in making this judgement.
(3) my car is faster now, not because of converting to non-sequential, but because I can NOW safely run a specific boost and hold it to 8000 rpms. My car feels so strong when the boost just builds. SMOOTH is the only term that comes to mind. Anyone who consistently tracks their car should consider this modification.
(4) even lauching my car and accelerating at WOP on the streets is easier and faster as there seems to less power fluctuations and erratic "activity" (subjective feeling) when doing this. I get the same results every damn time--never thought of the value and importance of consistent power delivery before.
(5) driving on the highway isn't an issue in 5th gear as long as you are holding speed of 70+.
(6) although low end power is LESS than sequential it is not weak/low in power. It's just RELATIVELY lower.
(6) remember you are always a single downshift away from an enormous rush of power (big FULL shove in the back as opposed to two strong taps--subjective comment again).
Just another data point for those considering this modification to contemplate.
Ramon
#3
NorCal 7's Co-founder
I'll be going non-seq once I get my BNR secret weapon twins. But looks like everything will be put on hold pretty soon since the military just surprised me. But oh well. Good write up bro, I can't wait to convert mine!! Laterz.
Zach
Zach
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I'm not sure about this. Anything under 5lbs and my car is a slow fat dog. In sequential, my 1st turbo kicks in @3500rpm and full boost = 4500rpm at which thime the 2nd turbo kicks in and full boost @5500rpm.
If both turbos can acheive full boost @4500rpm running parallel, then I would say non is better.
Are you looking at your gauges right? Maybe have a pasenger look at them for you. It sounds like you are saying you are reaching full boost "sooner" than you would running sequential?
If both turbos can acheive full boost @4500rpm running parallel, then I would say non is better.
Are you looking at your gauges right? Maybe have a pasenger look at them for you. It sounds like you are saying you are reaching full boost "sooner" than you would running sequential?
#5
development
Since its dontbearikki mod, and he is always talking up the purple box...does he run non-seq with the purple box? Is that possible (I guess that is my question)? There is a selection for 1 or 2 turbos, but is it a good idea to run non-seq with the purple box? TIA for anyone who can answer...
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Rikki runs(from my info) runs a stock ecu re-tuned for a Greddy TD-06 and a PMS purple.
The Noise level can be lowered in a non-sequential car by cutting the flapper door out completely. This makes the car a non-sequential from now on car.
The Noise level can be lowered in a non-sequential car by cutting the flapper door out completely. This makes the car a non-sequential from now on car.
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#8
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Originally posted by jspecracer7
Rikki runs(from my info) runs a stock ecu re-tuned for a Greddy TD-06 and a PMS purple.
The Noise level can be lowered in a non-sequential car by cutting the flapper door out completely. This makes the car a non-sequential from now on car.
Rikki runs(from my info) runs a stock ecu re-tuned for a Greddy TD-06 and a PMS purple.
The Noise level can be lowered in a non-sequential car by cutting the flapper door out completely. This makes the car a non-sequential from now on car.
Thanx Van you da man
-Rikki
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Remember if you're "only" getting 5 psi or whatever, you're getting it on BOTH turbos as long as you're below the would be transition point on a sequential car.
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I don't have a dyno plot of my car, but I'm sure you can find one somewhere on the forum. Again, a dyno plot is just a series of numbers. If you have time one weekend just try it out. If it's not for you then you can undo it rather quickly. I've seen dyno plots before and based on what I know now they don't tell the whole story--lot of this is based on driving style as well.
#12
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Hmmm...I'll have to see what kind of boost pattern the JDM Type RS/RZ twins give me?
I didn't you had a large street port from Dave. Mine's a mild street port...15% enlarged primary intake and exhaust ports, 25% enlarged secondary intake ports.
I didn't you had a large street port from Dave. Mine's a mild street port...15% enlarged primary intake and exhaust ports, 25% enlarged secondary intake ports.
#13
Ramon,
I'm glad to hear the conversion went well. The biggest thing I liked about non seq was the smoothness on the road course. Hmmm, now that i think about it, that is the only thing I liked about non seq
From looking at dyno charts and comparing seq with non seq, the non seq setup always seemed to have more area under the curve and always looked better on paper.
I'm glad to hear the conversion went well. The biggest thing I liked about non seq was the smoothness on the road course. Hmmm, now that i think about it, that is the only thing I liked about non seq
From looking at dyno charts and comparing seq with non seq, the non seq setup always seemed to have more area under the curve and always looked better on paper.
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Originally posted by GoRacer
I'm not sure about this. Anything under 5lbs and my car is a slow fat dog. In sequential, my 1st turbo kicks in @3500rpm and full boost = 4500rpm at which thime the 2nd turbo kicks in and full boost @5500rpm.
If both turbos can acheive full boost @4500rpm running parallel, then I would say non is better.
Are you looking at your gauges right? Maybe have a pasenger look at them for you. It sounds like you are saying you are reaching full boost "sooner" than you would running sequential?
I'm not sure about this. Anything under 5lbs and my car is a slow fat dog. In sequential, my 1st turbo kicks in @3500rpm and full boost = 4500rpm at which thime the 2nd turbo kicks in and full boost @5500rpm.
If both turbos can acheive full boost @4500rpm running parallel, then I would say non is better.
Are you looking at your gauges right? Maybe have a pasenger look at them for you. It sounds like you are saying you are reaching full boost "sooner" than you would running sequential?
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My question didn't get answered!
#17
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has anyone had much success installing the seq/non-seq switch set up? i know it's floating around here somewhere
I don't like the non-seq all the time because of the noise (dp, mp, Greddy SP is pretty loud as it is) and the low end lag, but it would be nice to just switch it on when i wanted to eliminated the transition and have some fun.
I don't like the non-seq all the time because of the noise (dp, mp, Greddy SP is pretty loud as it is) and the low end lag, but it would be nice to just switch it on when i wanted to eliminated the transition and have some fun.
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Manny:
I too am curious about your new 99 spec turbos in the sense that I wonder if you will be able to control boost spikes. Although I recall you have a high flow cat which will probably help a lot.
Josh:
From what I recall (maybe a thing of the past) you were "racing" 100% of the time Basically I just like things to be simple and reliable--remember my boost problems at VIR last year? No more of that crap.
Meanwhile let me know if you sent the check in for Spring MADS http://www.mazdadrivers.com
R
I too am curious about your new 99 spec turbos in the sense that I wonder if you will be able to control boost spikes. Although I recall you have a high flow cat which will probably help a lot.
Josh:
From what I recall (maybe a thing of the past) you were "racing" 100% of the time Basically I just like things to be simple and reliable--remember my boost problems at VIR last year? No more of that crap.
Meanwhile let me know if you sent the check in for Spring MADS http://www.mazdadrivers.com
R
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Boost "starts" @3500rpm and "not" full boost, it begins there and full boost on 1st turbo is @4500 when the transition begins, then full boost for the 2nd and/or both is @5500rpms.
This should be normal, not a problem with my control system. Is this not normal for every one elses RX-7?
How are you getting "and you other guys" claiming the same thing running parallel = instant full boost? If boost kicks in @3500 then you can not instantly have full boost @3500. You would have to be starting boost @2500rpms.
M2 claims parallel boost would only "begin" @4500rpms, the same as the 2nd turbo jumping in with transition in sequential mode.
This should be normal, not a problem with my control system. Is this not normal for every one elses RX-7?
How are you getting "and you other guys" claiming the same thing running parallel = instant full boost? If boost kicks in @3500 then you can not instantly have full boost @3500. You would have to be starting boost @2500rpms.
M2 claims parallel boost would only "begin" @4500rpms, the same as the 2nd turbo jumping in with transition in sequential mode.
Last edited by GoRacer; 01-08-03 at 09:50 PM.
#20
GoRacer- I start seeing boost ~2000 and 10psi ~2500rpm. Unlike rceron I spike on primary boost, and secondary is 8psi at changeover climbinig quickly back to an even 10psi all the way to redline. I think you should be getting boost much before 3500.
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Originally posted by GoRacer
Boost "starts" @3500rpm and "not" full boost, it begins there and full boost on 1st turbo is @4500 when the transition begins, then full boost for the 2nd and/or both is @5500rpms.
This should be normal, not a problem with my control system. Is this not normal for every one elses RX-7?
How are you getting "and you other guys" claiming the same thing running parallel = instant full boost? If boost kicks in @3500 then you can not instantly have full boost @3500. You would have to be starting boost @2500rpms.
M2 claims parallel boost would only "begin" @4500rpms, the same as the 2nd turbo jumping in with transition in sequential mode.
Boost "starts" @3500rpm and "not" full boost, it begins there and full boost on 1st turbo is @4500 when the transition begins, then full boost for the 2nd and/or both is @5500rpms.
This should be normal, not a problem with my control system. Is this not normal for every one elses RX-7?
How are you getting "and you other guys" claiming the same thing running parallel = instant full boost? If boost kicks in @3500 then you can not instantly have full boost @3500. You would have to be starting boost @2500rpms.
M2 claims parallel boost would only "begin" @4500rpms, the same as the 2nd turbo jumping in with transition in sequential mode.
Non-seq definitely has it's advantages - but it's not for me. i just switched back to sequential
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Originally posted by kwikrx7
There is something wrong with your FD In a sequential FD, 10 psi should be seen at 2500 rpms - non-seq. (depending on full conversion or not) 10 psi sould be around 3500.
Non-seq definitely has it's advantages - but it's not for me. i just switched back to sequential
There is something wrong with your FD In a sequential FD, 10 psi should be seen at 2500 rpms - non-seq. (depending on full conversion or not) 10 psi sould be around 3500.
Non-seq definitely has it's advantages - but it's not for me. i just switched back to sequential
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Originally posted by BoostedRex
I'll be going non-seq once I get my BNR secret weapon twins. But looks like everything will be put on hold pretty soon since the military just surprised me. But oh well. Good write up bro, I can't wait to convert mine!! Laterz.
Zach
I'll be going non-seq once I get my BNR secret weapon twins. But looks like everything will be put on hold pretty soon since the military just surprised me. But oh well. Good write up bro, I can't wait to convert mine!! Laterz.
Zach
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I just got home from driving around. I have non-seq in 3rd gear I get full boost (10-11psi) at 4500 rpms. For the record: I have an intake, street port, DP, HiFlo and TRUE non-seq - w/stock CB.
I'm pretty sure everything (that is pertinent) is working well in my car.
I'm pretty sure everything (that is pertinent) is working well in my car.