FI Discussion Thread for the Boost Atheists
12-18-2007, 09:25 PM
#127
Quickie on coils:
The RX-8 coils are integral ignitor, so no capacitive boxes will work.
The HKS works by cutting of the current to the coil right as the field collapses, so there is no "reversion" pulse on the circuit that robs current.
The trigger is positive going, trailing edge, so if anyone knows of an application that triggers similarly, an upgrade would be possible.
I haven't renewed my research on this yet as I've found that A/F at the torque peak can be managed in the 300 HP range such that it doesn't extinguish the spark.
10:1 or so is the limit at that point.
The RX-8 coils are integral ignitor, so no capacitive boxes will work.
The HKS works by cutting of the current to the coil right as the field collapses, so there is no "reversion" pulse on the circuit that robs current.
The trigger is positive going, trailing edge, so if anyone knows of an application that triggers similarly, an upgrade would be possible.
I haven't renewed my research on this yet as I've found that A/F at the torque peak can be managed in the 300 HP range such that it doesn't extinguish the spark.
10:1 or so is the limit at that point.
12-18-2007, 09:41 PM
#130
the coils that Scott will be offering or not the LS 1's. If I am not mistaken the ones that Jeff tried didnt work out--forgot the reason.
But spark blow out will not be a problem with Mazsports coil setup.
I believe most people will not want to go beyond the range of the oem injectors and fuel delivery system. Course some will
I am staying with a standalone pcm for the flexibility. The Pettit flash which includes a free flowing cat is working out great but like what has been said--if you mod anymore you will need another flash to handle the different mods.
I am a little cautious that a cat will not have a long life expectancy if you do a good number of track events and the flash is tuned for the cat. I could be wrong.
While true HP numbers are increasing across the board and that 400 hp is great you would also have to change some more of the car to handle 400hp on a road race circuit. A good bit of it. Cooling, braking, possibily transmission comes to mind.
Ah to dream!
oscd
But spark blow out will not be a problem with Mazsports coil setup.
I believe most people will not want to go beyond the range of the oem injectors and fuel delivery system. Course some will
I am staying with a standalone pcm for the flexibility. The Pettit flash which includes a free flowing cat is working out great but like what has been said--if you mod anymore you will need another flash to handle the different mods.
I am a little cautious that a cat will not have a long life expectancy if you do a good number of track events and the flash is tuned for the cat. I could be wrong.
While true HP numbers are increasing across the board and that 400 hp is great you would also have to change some more of the car to handle 400hp on a road race circuit. A good bit of it. Cooling, braking, possibily transmission comes to mind.
Ah to dream!
oscd
12-18-2007, 09:47 PM
#131
Rotared
iTrader: (1)
Join Date: Sep 2005
Location: SW OKC
Posts: 215
Likes: 0
Received 0 Likes
on
0 Posts
Right about where I am. I think it is 11.3, but not on my 8 I am using my 7 as a comparision and trying to figure out why and how the renny does what it does. I really need to get into my 8. I am running motec coils part number 42015 and have no issues at 16 psi. Even lighting it at 10:1 which is where I started when tuning it.
I attached a picture of the coils. Please excuse the wiring I am doing some changes at the moment. Also be glad you guys that have seen spark blow out haven't had this happen due to a misfire. Check out pic2
I attached a picture of the coils. Please excuse the wiring I am doing some changes at the moment. Also be glad you guys that have seen spark blow out haven't had this happen due to a misfire. Check out pic2
12-18-2007, 11:43 PM
#135
"MuNcH-E"
Join Date: Apr 2007
Location: Pembroke Pines
Posts: 627
Likes: 0
Received 0 Likes
on
0 Posts
I am running the Pettit Flash with the Racing Beat Race Pipe with no CEL. The flash I have is the same one that all the other Flashed cars have nothing special.
12-19-2007, 12:28 AM
#137
Dongbag extrordinare
Join Date: Nov 2004
Location: Away from the fruits of my labor
Posts: 1,090
Likes: 0
Received 0 Likes
on
0 Posts
Can we talk about how and why the Pettit Flash(MAF based) is making 40+ rwhp more than the Interceptor X(MAP based) for those running the SC kits??
12-19-2007, 01:27 AM
#140
Well, its a combination of things, no doubt.
First of all, the ignition timing in the Int-X programming they were shipping was lighting the charge a week after it was compressed, so going back to an OE timing curve is probably good for 15 to 25 HP.
I'll have to go back and look at their marketing/dyno stuff and see what's up.
First of all, the ignition timing in the Int-X programming they were shipping was lighting the charge a week after it was compressed, so going back to an OE timing curve is probably good for 15 to 25 HP.
I'll have to go back and look at their marketing/dyno stuff and see what's up.
12-19-2007, 07:38 AM
#141
It's probably a combination of factors. The fact that they tried to make a safe tune that would work on a bunch of different cars is probably one of the main reasons...
Scott himself tuned a Pettit equipped 8 that saw little power increase from the base map (although it RAN much more smoothly) after the tune. So there may be more to it.
Scott himself tuned a Pettit equipped 8 that saw little power increase from the base map (although it RAN much more smoothly) after the tune. So there may be more to it.
12-19-2007, 09:19 AM
#142
Dongbag extrordinare
Join Date: Nov 2004
Location: Away from the fruits of my labor
Posts: 1,090
Likes: 0
Received 0 Likes
on
0 Posts
I believe that Scott's Int-X tune is ultra-conservative. I've been running the tune he did for Juan and it is so rich, I think I am cutting a new hole in the ozone from my house to work.
Is the Int-X even capable of running the timing needed to catch up to the flash??
Charles, what do you think about fabricating a metal coupler to replace the silicon one between the Pettit blower and UIM w/pre-positioned taps for water/meth injection?
Is the Int-X even capable of running the timing needed to catch up to the flash??
Charles, what do you think about fabricating a metal coupler to replace the silicon one between the Pettit blower and UIM w/pre-positioned taps for water/meth injection?
12-19-2007, 10:58 AM
#144
True injectors can be changed pretty easily --but I'm thinking that fuel delivery is more of a problem. The oem fuel pump/regulator just will not handle 400hp well. Scott is the only one that I know of that has an upgrade for that. I think his converts the system to a return type also? personally for that type of performance(400hp) on the track i would want dual pumps or a better sump.
remember also on the pettit flash -- it is not just the flash they also provide a high flow cat and a different maf tube as part of the package. So the flash alone is not responsible for all of the increase? Course some folks are running a midpipe. Not knocking the flash at all--just interested in seeing apples to apples.
in speaking with Scott at Mazsport (i have an appointment 2nd week in Jan) he assures me that a tune will bring the power up to what the flash does --if i want that. Also my mpg should go back to basically what I was getting beforehand.
I am also getting a double resonated midpipe (quite!). there may be some other interesting things lying around that i may end up with also
The base map for a Pettit unit is very rich---on purpose as stated beforehand.
Ok so we havent mentioned the TPS in regard to a map governed car. I believe the 13 B has a mechanical TB and we of course have the fly by wire car. So under load conditions doesnt that change things a little? For those of us that are running a non oem EMS?
Also are most people still pre mixing after they FI? Anything change in that regard?
Swoop---glad you are with us !
oscd
remember also on the pettit flash -- it is not just the flash they also provide a high flow cat and a different maf tube as part of the package. So the flash alone is not responsible for all of the increase? Course some folks are running a midpipe. Not knocking the flash at all--just interested in seeing apples to apples.
in speaking with Scott at Mazsport (i have an appointment 2nd week in Jan) he assures me that a tune will bring the power up to what the flash does --if i want that. Also my mpg should go back to basically what I was getting beforehand.
I am also getting a double resonated midpipe (quite!). there may be some other interesting things lying around that i may end up with also
The base map for a Pettit unit is very rich---on purpose as stated beforehand.
Ok so we havent mentioned the TPS in regard to a map governed car. I believe the 13 B has a mechanical TB and we of course have the fly by wire car. So under load conditions doesnt that change things a little? For those of us that are running a non oem EMS?
Also are most people still pre mixing after they FI? Anything change in that regard?
Swoop---glad you are with us !
oscd
12-20-2007, 10:56 PM
#147
No means yes
iTrader: (1)
Join Date: Nov 2006
Location: Jersey City NJ
Posts: 1,507
Likes: 0
Received 0 Likes
on
0 Posts
In this regard we have a pretty big advantage IMO... From reading the 7 forum back in the day at least 80% of the "issues" threads ended up being answered with "check your TPS"...
12-26-2007, 07:10 PM
#149
Dongbag extrordinare
Join Date: Nov 2004
Location: Away from the fruits of my labor
Posts: 1,090
Likes: 0
Received 0 Likes
on
0 Posts
Well, it's been a few days since I drove the car, but to reiterate what I typed in the other thread: My guage(Autometer) shows@5lbs and gradually increases to @8lbs @8k rpms. I have been told that a guage can be off 1-2lbs based on the weather, which means I could actually have @6-9lbs. I'll be right back w/ my other questions.
12-26-2007, 07:16 PM
#150
Dongbag extrordinare
Join Date: Nov 2004
Location: Away from the fruits of my labor
Posts: 1,090
Likes: 0
Received 0 Likes
on
0 Posts
MM, you stated earlier in the thread we just left that a properly sized blower should be making maximum boost before 6200 rpm, why??